The collection, launched in 2021 by Vegetation Classification and Survey and the African Section of the International Association for Vegetation Science, contains studies from Morocco, Benin, South Africa and Namibia. It therefore covers three of Africa’s major regions rather than the entire continent.

At the continental scale, available classifications are broad physiognomic systems. White’s 1983 classification recognized 16 natural vegetation types, while a remote-sensing-based system by Mayaux and colleagues in 2003 grouped vegetation into five main types. The review reports that comprehensive fine-scale overviews exist for relatively few countries or territories, including Morocco and South Africa, Lesotho and Eswatini, while many other studies address local areas or selected vegetation types.

African flora and vegetation data are less available and accessible than in Europe and the Americas, according to the review. It identifies data availability, language barriers, limited research funding and political instability as obstacles. African Union member states committed in 2006 to spend 1% of gross domestic product on research and development, but the continent’s funding reached 0.42% in 2019, compared with a global average of 1.7%.

Vegetation-plot records are particularly sparse in international databases. The review cites the working version of sPlot 4.0, which contains 45,202 plots from African countries out of 2,531,784 worldwide, or 1.8%, although Africa covers 22.5% of Earth’s ice-free surface. Thirty regional databases contributed data from 38 African countries, but some countries had no plots in sPlot. Namibia and Morocco had relatively good coverage, while South Africa’s National Vegetation Database contained more than 46,000 plot-based records but had not joined sPlot.

Two studies examined environmental gradients. In Namibia, Naftal and colleagues classified vegetation from 1,986 relevés into 12 units and used a Random Forest model to project distributions under 2080 climatic conditions. The model achieved 82% prediction accuracy and projected greater dominance of broad-leaved and degraded thornbush savannas, while mountain, dwarf-shrub and dry thornbush savanna units would decrease in area or disappear. These are model projections rather than observed changes.

In South Africa’s Tankwa Karoo National Park, Samuels and colleagues compared three vegetation types across elevations from 338 to 1,147 metres above sea level. Species composition and environmental variables distinguished the habitats, while slope and rockiness were associated with variation within vegetation types. In Benin’s Pendjari Biosphere Reserve, Assèdé and colleagues analysed 202 Braun-Blanquet relevés, identifying 249 species in 11 associations associated with a dryland-to-wetland moisture gradient.

The other studies examined traditional agroecosystems in Morocco, land-cover change on Beninese inselbergs and Karstveld vegetation in Namibia. Chakkour and colleagues recorded 209 species in 94 relevés across six Moroccan study areas. Ayeko and colleagues used Sentinel-2 and Spot-5 imagery at 10-metre resolution to assess land cover from 2003 to 2018, finding expansion of savanna, grassland, fields, fallow land and plantations alongside conversion of natural vegetation. Strohbach and Strohbach classified Namibian Karstveld from 889 relevés into four major types and formally described 17 new associations.

The authors recommend stronger cross-country collaboration, expanded plot sampling, improved databases, training and development of an African Vegetation Archive. They cite Europe’s long-term Vegetation Survey as an example of cooperation, while emphasizing that Africa’s scale, resource constraints and existing regional initiatives require a tailored approach. The review itself is explicitly incomplete and regionally biased, so the collection does not constitute a comprehensive assessment of African vegetation.

Subject of Research: Continental gaps and regional advances in African vegetation classification

Article Title: African vegetation studies: introduction to a Special Collection

Article References: Guuroh, R. T., Brown, L. R., Alvarez, M., Finckh, M., Schmiedel, U., Tsheboeng, G., & Dengler, J. (2024). African vegetation studies: introduction to a Special Collection. Vegetation Classification and Survey, 5, 279-288. https://doi.org/10.3897/vcs.143360

Image Credits: AI Generated

DOI: 10.3897/VCS.143360

Keywords: African vegetation, vegetation classification, vegetation plots, sPlot database, remote sensing, phytosociology, Namibia, South Africa, Benin, Morocco, African, vegetation

Researchers used the Braun–Blanquet method to survey plant communities in 2013. They investigated semi-deciduous forest, gallery forest, woodland and savanna, recording plant cover, vegetation structure, topography, soil conditions, flooding and site coordinates. Sampling plots were 30 m by 30 m in woodland, 20 m by 25 m in gallery forests and 10 m by 10 m for the herbaceous layer. Plant specimens for most species were confirmed at the National Herbarium of Benin.

Multivariate analyses separated the sampled plots into a wetland group of 73 relevés and a dryland group of 129 relevés. The wetland group contained 177 species and included riparian forest, floodplain woodland and savanna on moist to wet soils, including sites subject to temporary flooding. The dryland group contained 206 species and represented savanna and woodland on plateau soils. The authors reported that soil-moisture status was associated with the first major division in the ordination, while drainage, relief and vegetation cover were associated with variation within the two groups.

The analysis distinguished six wetland associations and five dryland associations. Wetland associations included Hyparrhenio glabriusculae–Mitragynetum inermis, Terminalio macropterae–Mitragynetum inermis, Sorghastro bipennati–Vachellietum hockii, Brachiario jubatae–Terminalietum macropterae, Borassetum aethiopi and Coletum laurifoliae. Their placement was associated with contrasts in flooding duration, drainage and proximity to streams. For example, Coletum laurifoliae occurred along the Pendjari River where flooding exceeded six months, whereas Sorghastro bipennati–Vachellietum hockii occurred on temporarily flooded sites with a flooding period no longer than two months.

Dryland vegetation comprised Terminalietum leiocarpae, Andropogono gayani–Combretetum glutinosi, Andropogono gayani–Terminalietum avicennioidis, Burkeo africanae–Detarietum microcarpi and Andropogono gayani–Senegalietum dudgeonii. The Terminalietum leiocarpae association had the highest recorded species richness, with 136 species and an average of 41 ± 11.2 species per relevé. The lowest was Andropogono gayani–Senegalietum dudgeonii, with 33 species and an average of 24 ± 2.1 species per relevé. Mean richness across the remaining associations ranged from 23.7 ± 2.4 to 39.4 ± 7.8 species per relevé.

Floristic similarity also varied among communities. Jaccard similarity indices below 50% indicated differences among the wetland communities; the closest pair had an index of 0.46. Several dryland communities showed greater overlap, with a maximum value of 0.66 between the communities characterized by Crossopteryx febrifuga and by Vitellaria paradoxa and Andropogon gayanus. These comparisons indicate that some dryland communities shared more species with one another than wetland communities did.

Soil sampling was conducted at 20 cm depth, with five samples taken in each representative plot. The authors measured particle size, pH, organic matter, organic carbon, total nitrogen and available phosphorus. Riparian associations Borassetum aethiopi and Coletum laurifoliae were associated with river-associated soil group B, which had 3% clay and 47% sand. Floodplain associations occurred on hydromorphic soil groups I and C, with pHwater of 7.00, organic matter of 4.15%–4.55% and organic carbon of 2.49%–2.52%. Plateau associations were associated mainly with ferruginous and ferralitic soil groups, where sand reached 70% and organic matter ranged from 1.1% to 1.6%.

Some associations showed structural differences associated with their habitats. Coletum laurifoliae had a tree layer with 80%–90% cover and a sparse herbaceous layer, whereas the Terminalio macropterae–Mitragynetum inermis association had a tree canopy of 25%–75% and herbaceous cover of 50%–85%. The Burkeo africanae–Detarietum microcarpi association occurred on rocky hill slopes, while Andropogono gayani–Terminalietum avicennioidis was recorded on deep sandy-clay plateau soils.

The study was limited to one sampling campaign in 2013 and did not establish associations for the reserve’s pond ecosystems. The researchers also did not investigate seasonal changes in floristic patterns during the dry season, and disturbance regimes, including fire and elephant impacts, were not evaluated. The findings therefore describe plant associations and their measured environmental patterns within the sampled reserve, rather than demonstrating long-term vegetation change or a causal effect of any single environmental factor.

Subject of Research: Phytosociological differentiation of wetland and dryland plant associations in the Pendjari Biosphere Reserve, Benin

Article Title: Ecological and structural differentiation of the Sudanian woodlands in the Biosphere Reserve of Pendjari, Benin

Article References: Assèdé, E. S. P., Biaou, S. S. H., Orou, H., Oumorou, M., Geldenhuys, C. J., Chirwa, P. W., & Sinsin, B. (2023). Ecological and structural differentiation of the Sudanian woodlands in the Biosphere Reserve of Pendjari, Benin. Vegetation Classification and Survey, 4, 139-165. https://doi.org/10.3897/vcs.91126

Image Credits: AI Generated

DOI: 10.3897/VCS.91126

Keywords: Pendjari Biosphere Reserve, Benin, phytosociology, plant associations, Sudanian woodlands, soil moisture, wetland vegetation, dryland vegetation, vegetation survey, plant species richness, Ecological, structural

The researchers selected 40 settlements within a 25-km radius of each of the two breeding sites and used a radial sampling design to examine the spatial distribution of Simulium damnosum sensu lato, the black fly group that includes the vectors of onchocerciasis. Human landing catches were conducted at the breeding sites and in settlements, while one Esperanza window trap was operated at each settlement. Morphological methods were used to identify the black flies, and catches were examined to assess parity and determine the presence of parasite material.

Parasite detection combined O-150 PCR pool screening with dissection, allowing the investigators to determine whether collected flies carried the parasite and to relate infection status to distance from the breeding site. Biting rates were calculated in relation to sampling effort, while generalized additive models were used to describe trends in entomological indices over distance. The study was observational and spatially descriptive: it characterized patterns in sampled locations rather than directly tracing individual flight paths or establishing the contribution of particular flies to transmission.

Across 656 sampling days, the survey collected 76,050 black flies, primarily around Bétérou. At that site, black fly counts and biting rates generally decreased with increasing distance from the breeding site, but the pattern was not uniform. Positive O-150 PCR pools were found at 31 of 41 sites examined around Bétérou, and infective flies were recorded up to 19 km from the breeding site. These observations show that the spatial extent of infection-associated flies was not confined to settlements immediately beside the breeding habitat.

The prevalence of infective flies at Bétérou was 0.11% in 2023 and 0.08% in 2024. Both values exceeded the World Health Organization infectivity prevalence threshold specified for interrupted transmission. The parous rate, defined in the study through dissection, remained relatively constant across distance from the breeding site. The abundance of the catches therefore changed with distance even though the proportion of parous flies did not show a corresponding distance-related trend.

Asubende showed similar broad patterns in the available data, but the number of black flies collected was too low to support a detailed analysis of trends with distance. No infective flies were detected there through PCR. The contrast in sampling yield means that the Asubende observations should not be interpreted as evidence that infection-associated flies were absent from every unsampled location or across the full 25-km study area.

The results identify a potential limitation in relying only on riverine sites for onchocerciasis vector surveillance. The abstract notes that black flies can disperse over hundreds of kilometres, so sampling confined to breeding sites or first-line villages may miss exposed communities farther away. In the surveyed Beninese landscape, the detection of infective flies at distances of up to 19 km directly demonstrated that infection-associated vectors occurred beyond the immediate breeding area. The findings therefore support broader, spatially extensive sampling for a more complete account of where infected vectors are present.

Broader sampling does not, by itself, establish the causes of the observed spatial patterns. The study did not directly measure long-distance flight paths, settlement-level disease outcomes or the epidemiological contribution of individual flies, and the descriptive models were restricted by the amount of data available at Asubende. The authors conclude that comprehensive spatial–temporal modelling is needed to investigate the dynamics underlying the observed distribution. For now, the measured result is clear at the surveyed sites: near Bétérou, black fly abundance and biting rates generally diminished with distance, yet parasite-positive and infective flies remained detectable well beyond the first settlements around the breeding site.

Subject of Research: Spatial patterns and parasite infection in onchocerciasis black fly vectors around breeding sites in Ghana and Benin

Article Title: Spatial patterns of black fly (Simulium damnosum s.l.) dispersal in Ghana and Benin and their implications for onchocerciasis surveillance

Article References: Kyomuhangi, I., Carnaghi, M., Boko-Collins, P., Soglongbe, B. B., Koukpo, Z. C., Otabil, K. B., Veriegh, F. B. D., Fronterre, C., Basáñez, M.-G., Cheke, R. A., & Hawkes, F. M. (2026). Spatial patterns of black fly (Simulium damnosum s.l.) dispersal in Ghana and Benin and their implications for onchocerciasis surveillance. Parasites & Vectors. https://doi.org/10.1186/s13071-026-07747-w

Image Credits: AI Generated

DOI: 10.1186/s13071-026-07747-w

Keywords: black flies, onchocerciasis, vector surveillance, spatial dispersal, Simulium damnosum, Ghana, Benin, parasite PCR, entomological monitoring, wet-season sampling, Spatial, patterns

Metastenasellus belongs to the asellote isopod family Stenasellidae, whose members are adapted to groundwater habitats. Before this study, the genus contained nine formally described species distributed across a trans-Saharan range, including one species from Algeria and eight from West and Central Africa. No species had been described from Benin, while Cameroon had two named species, Metastenasellus camerounensis and M. boutini. Earlier field observations and a small number of COI sequences had nevertheless indicated that the genus was present in both countries and might conceal additional diversity that conventional descriptions had not resolved.

The specimens came from sampling campaigns conducted between 2015 and 2019 in Benin’s Ouémé and Yéwa basin and during 2009 and 2019 in Cameroon. In Benin, researchers visited 169 stations, 98 of which contained isopods; the DNA dataset selected 57 Metastenasellus specimens from 19 of those stations to provide a geographically balanced representation of the basin. In Cameroon, approximately 150 stations were surveyed in the Wouri, Sanaga and Nyong watersheds, and Metastenasellus was found at 44 stations. The combined molecular dataset contained 57 specimens from Benin and 32 from Cameroon, together with the externally described species Stenasellus virei as an outgroup for rooting the phylogenetic tree.

Animals were collected from traditional hand-dug and modern lined wells with a modified phreatobiological net and baited traps. DNA was extracted from small pieces of appendage tissue where possible, while whole individuals were sometimes used for smaller specimens. Researchers amplified the COI marker by polymerase chain reaction, checked the products by electrophoresis and obtained bidirectional Sanger sequences. After sequence assembly and comparison with GenBank records, the analyses included newly generated sequences, two previously available Beninese sequences and four available from Cameroon, plus five sequences of the named species M. boutini.

A maximum-likelihood phylogeny was inferred with IQ-TREE under a TN+F+I+G4 nucleotide substitution model selected by the Bayesian Information Criterion. Branch support was estimated with 1,000 ultrafast bootstrap replicates. The researchers then used ASAP, a distance-based method for assembling species by automatic partitioning; GMYC, a generalized mixed Yule coalescent model applied to an ultrametric tree; and two implementations of Poisson tree processes, one allowing different rates among lineages and one using a single rate. They also calculated uncorrected pairwise distances among specimens and within and between the molecular units. This combination allowed the molecular partitions to be compared with both genetic divergence and the branching structure of the phylogeny.

ASAP consistently recovered the same 23 molecular operational taxonomic units whether it used p-distances, Jukes-Cantor distances or Kimura two-parameter distances. Eleven units were associated with Benin and 12 with Cameroon. GMYC independently identified the same 23 units, each represented by a singleton or a strongly supported clade with bootstrap values of 99–100 percent. Multi-rate Poisson tree processes returned 22 units, merging the units numbered 13 and 14, whereas the Bayesian single-rate implementation proposed 26 units. That method split MOTU 1 into two singletons and divided MOTU 12 into two singletons and a two-specimen group. The authors regarded the 26-unit result as less plausible because some proposed splits occurred between sequences separated by only 2.1–3.5 percent divergence.

Genetic distances showed a pronounced gap between variation within the 23 principal units and divergence among them. Maximum within-unit uncorrected pairwise distances ranged from 0.2 percent in MOTUs 9 and 10 to 3.5 percent in MOTUs 12 and 22. Mean distances between units ranged from 17.1 percent for MOTUs 5 and 7 to 27.5 percent for several pairs, while the largest pairwise distance among all specimens was 28.6 percent. The authors compared these values with a crustacean COI threshold of 0.16 substitutions per site derived from patristic distances, noting that the Metastenasellus values were well above that benchmark. They also cited the 24.5-percent separation between the named species M. boutini and M. camerounensis as a reference point for interspecific divergence within the genus.

Additional observations were consistent with many molecular units representing distinct species. Morphological work in progress found clearly different male second pleopods among specimens assigned to MOTUs 9, 10 and 11, whose pairwise distances ranged from 20.4 to 24.8 percent. Two units also occurred together at each of two Beninese stations, BEN072 and IBT, providing evidence of separately evolving mitochondrial lineages in sympatry. The researchers nevertheless cautioned that divergent mitochondrial genomes can coexist within one species, so neither sympatry nor a large barcode distance conclusively resolves the question. They likewise emphasized that introgression and incomplete lineage sorting can affect species delimitation based on a single locus.

The geographic distributions recorded for the molecular units were narrow. Most appeared associated with individual stations or nearby localities, and no unit detected in the upper Ouémé basin was found farther downstream, even though the river could potentially have connected portions of the basin. These patterns suggested substantial isolation among groundwater populations, although the study’s geographic coverage was too limited to map the full ranges of the organisms. The finding is especially notable because it emerged from the first substantial sampling of Metastenasellus in Benin and Cameroon. The authors compared their result with an analysis of obligate groundwater Aselloidea in Western Europe that identified about 150 species in 12 genera, while noting that African diversity remains largely uncharacterized.

Overall, the study provides a DNA-based assessment of diversity within a poorly documented stygobiont genus rather than a completed taxonomic revision. The 23 molecular units include the two named Cameroonian species and numerous lineages not formally described, including all 11 units associated with Benin. Their separation is supported by agreement among three principal delimitation approaches, large genetic distances and, for some lineages, anatomical or sympatric evidence. Yet formal recognition of species would require integration with morphological examination and additional genetic data, particularly nuclear markers. The research therefore establishes 23 candidate lineages as a concrete measure of the diversity present in the sampled wells, while leaving their status and wider distributions open for subsequent taxonomic examination.

Subject of Research: DNA-based species delimitation of the groundwater isopod genus Metastenasellus in Benin and Cameroon

Article Title: DNA taxonomy reveals high species diversity among the stygobiont genus Metastenasellus ( Crustacea , Isopoda ) in African groundwater

Article References: Lagnika, M., Kayo, R. P. T., Sonet, G., Flot, J.-F., & Martin, P. (2024). DNA taxonomy reveals high species diversity among the stygobiont genus Metastenasellus (Crustacea, Isopoda) in African groundwater. Subterranean Biology, 48, 51-71. https://doi.org/10.3897/subtbiol.48.113022

Image Credits: AI Generated

DOI: 10.3897/subtbiol.48.113022

Keywords: Metastenasellus, groundwater isopods, DNA barcoding, COI gene, species delimitation, cryptic diversity, Benin, Cameroon, stygobionts, Stenasellidae, taxonomy, reveals

Inselbergs are rocky outcrops of granite or gneiss that tower above the surrounding tropical peneplain, a term first coined by the German geologist Bornhardt in 1900. Because their thin soils, exposed rock surfaces and harsh microclimates differ so sharply from the surrounding landscape, they harbor specialized vegetation with high rates of endemism, including geographically restricted and threatened species. They also influence water and nutrient supplies for neighboring lands. Yet despite their ecological value, inselbergs remain among the most poorly surveyed ecosystems on Earth, and reliable estimates of how fast they are being destroyed worldwide are still lacking.

To fill that gap for West Africa, researchers turned to the Collines department of central Benin, a 13,931-square-kilometer transition zone between subequatorial and tropical climates where annual rainfall ranges from 800 to 1,500 millimeters and mean temperatures hover between 28 and 30 degrees Celsius. The region hosts a series of steep-sided inselbergs at Savè, Fita, Dassa-Zoumè and Minifi, with the highest summits reaching 520 meters on the Savalou hill and 465 meters on the Dassa-Zoumè granite chain. Local communities quarry these outcrops for gravel, cut wood for charcoal and hunt across their slopes, pressures that have intensified as the population grows by more than 3 percent each year.

The research team, publishing in Vegetation Classification and Survey, compared land cover in 2003 and 2018 using Spot 5 and Sentinel-2 satellite images, both at a spatial resolution of 10 meters. Sentinel-2, launched by the European Space Agency, offers three red-edge bands that capture the strong near-infrared reflectance of vegetation, making it the sharpest freely available tool for distinguishing subtle differences in plant cover. Because Sentinel-2 archives did not extend back to 2003, the team used Spot 5 imagery from the OSFACO project as the earlier baseline, a pairing that previous studies have shown to be reliable for spatio-temporal comparison. A digital elevation model from the Shuttle Radar Topography Mission, at roughly 30-meter resolution, allowed the researchers to separate inselbergs from their adjacent plains by combining elevation thresholds above 180 meters with slopes steeper than 10 percent.

Classification of the imagery relied on a supervised maximum likelihood approach trained with 110 ground control points collected during field visits with a handheld GPS. Nine land cover classes emerged: forest, wooded savanna, tree and shrub savanna, grassland, tree plantation, field and fallow, water surface, bare rock and settlement. Overall accuracy reached 84.7 percent for the 2003 map and 83.6 percent for 2018, with Kappa coefficients of 0.823 and 0.784 respectively, indicating strong agreement between the digital interpretation and conditions on the ground.

The results document a dramatic reshaping of the landscape. Forest cover collapsed from 8.55 percent of the study area in 2003 to just 3.05 percent in 2018, while wooded savanna plummeted from 17.63 percent to 4.79 percent. In their place, grassland expanded from 7.60 percent to 16.69 percent, tree and shrub savanna rose from 6.52 percent to 9.49 percent, and fields and fallow land surged from 5.57 percent to 26.12 percent. Tree plantations nearly doubled, climbing from 6.05 percent to 13.47 percent. The transition matrix revealed that bare rock, which dominated nearly half the terrain in 2003, was progressively colonized by grasses and then converted to cultivation, a sequence driven by the way water flowing over the rock surfaces weathers them into thin soils that first support grassy vegetation and, as soil depth and water retention increase, progressively richer woody growth.

Two indices quantified the human footprint. The dominance index, which measures the share of a class held by its single largest patch, rose sharply for fields and fallow, signaling the consolidation of agricultural land into large contiguous blocks. The fragmentation index, which captures how broken up a land class has become, increased for nearly all natural cover types between 2003 and 2018. Fragmentation is recognized as the first consequence of landscape transformation and is typically associated with agricultural intensification. Its rise across Benin’s inselbergs suggests shrinking natural habitat, greater isolation of remaining patches and an expanding proportion of edges, changes that threaten the endemic biodiversity these rock islands evolved to support.

Perhaps the most sobering finding concerns the role of protected areas. The classified forests of Dassa-Zounmé and Savalou contain parts of the inselberg system, and theory predicts that such reserves should slow the conversion of natural to human-modified land cover. Yet when the researchers compared land cover on inselbergs inside and outside protected boundaries using a chi-square test, they found no statistically significant difference in either 2003 or 2018. Natural vegetation was nearly equally distributed across both categories at the start of the period, and by 2018 fields and fallow had expanded on protected and unprotected inselbergs alike. The only encouraging signals were a notable increase in tree plantations on protected inselbergs, possibly reflecting reforestation efforts by conservation authorities, and better growth of tree and shrub savanna inside reserves. Still, the absence of statistical significance suggests that social, economic and environmental pressures operate regardless of legal status.

The drivers behind this transformation are complex. Slash-and-burn agriculture, charcoal production and rapid population growth have long been implicated in vegetation loss across Benin, and shortening fallow periods prevent soils from recovering fertility, pushing farmers onto ever new land. Field investigations revealed an unexpected motive: farmers in the Collines department are deliberately acquiring agricultural plots on the inselbergs to manage transhumance, the seasonal movement of herders and livestock that has sparked deadly conflicts in the region. Because the steep slopes and altitude limit animal movement, cultivating inselberg land reduces exposure to farmer-herder violence, even though these rocks were long considered unsuitable for agriculture. Climate change compounds the pressure, as rising temperatures increase evapotranspiration and reduce water availability in already arid landscapes, while annual dry-season fires consume inselberg vegetation each year and can shift dense natural formations toward less woody states.

The authors conclude that an urgent conservation and restoration plan is needed, built around awareness campaigns to educate local communities about the value of inselbergs, participatory planning that involves residents in decision-making, tree planting through seed collection and nursery production, sustainable forest management to curb illegal cutting, hunting and quarrying, and agroforestry systems that embed trees within agricultural fields to relieve pressure on the outcrops themselves. Without such intervention, the granite islands that have sheltered rare species for millennia may continue their quiet conversion into fields and fallow, a loss measured not in centuries but in the span of a single generation.

Subject of Research: Land cover change on inselberg landscapes and adjacent areas in the Sudano-Guinean zone of Benin assessed through remote sensing

Article Title: Dynamics of inselberg landscapes and their adjacent areas in the Sudano-Guinean zone of Benin through remote sensing analysis

Article References: Ayeko, R. E. D., Toyi, S. S. M., Assogbadjo, A. E., & Sinsin, B. A. (2023). Dynamics of inselberg landscapes and their adjacent areas in the Sudano-Guinean zone of Benin through remote sensing analysis. Vegetation Classification and Survey, 4, 189-202. https://doi.org/10.3897/vcs.89746

Image Credits: AI Generated

DOI: 10.3897/VCS.89746

Keywords: inselbergs, Benin, land use land cover, remote sensing, Sentinel-2, Spot 5, deforestation, protected areas, biodiversity conservation, Sudano-Guinean zone, habitat fragmentation, West Africa

The research, conducted by a team at the University of Parakou’s Laboratory of Ecology, Health and Animal Production, surveyed 236 people between July and November 2025 in the Borgou department, the heart of Benin’s nascent goat dairy industry. What sets the study apart is its three-way segmentation of respondents. Rather than lumping everyone into a single category of consumer or non-consumer, the researchers divided participants into three distinct groups: 81 people who knew and had consumed goat milk or its derived products, 77 who knew of the products but had never tried them, and 78 who had no prior knowledge of goat milk at all. This tripartite design allowed the team to test a crucial assumption, namely that the barriers to adoption are unlikely to be uniform across the full spectrum of potential consumers.

The statistical architecture of the study was correspondingly careful. Data were collected through structured face-to-face questionnaires containing 31 substantive items across four modules, pre-tested on 30 individuals before deployment. Because the three groups differed in how they were recruited, consumers and knowledgeable non-consumers were identified at production farms and sales points, while non-knowledgeable individuals were randomly selected in urban centers, the researchers used Chi-square tests to compare categorical variables and Welch’s one-way analysis of variance, robust to unequal variances, for age comparisons, followed by Games-Howell post-hoc tests. Levene’s test confirmed that variances were indeed unequal, justifying the choice of the Welch approach. A significance threshold of p less than 0.05 was applied throughout.

The sociodemographic results were revealing in their asymmetry. Consumers of goat milk products were significantly younger, averaging 30.04 years, compared with 36.09 years for knowledgeable non-consumers and 39.28 years for those with no prior knowledge, a difference that was highly significant. Yet gender and education level, factors often assumed to shape food choices, showed no significant influence whatsoever. Instead, religion and profession emerged as powerful discriminators, both with p values below 0.001. Merchants made up 92.6 percent of the consumer group, while students dominated the knowledgeable non-consumer group at 93.5 percent and civil servants the non-knowledgeable group at 97.4 percent. The pattern points to a sector whose growth is currently governed less by individual preference than by proximity to commercial circuits.

Among actual consumers, the picture was one of an early-stage market still finding its footing. The duration of consumption was almost perfectly evenly distributed across four time categories, from less than six months to more than three years, suggesting the product attracts newcomers while retaining long-term users. Motivations for first consumption were similarly balanced: curiosity accounted for 25.9 percent, recommendations from close people 24.7 percent, and perceived health benefits 24.7 percent. Discovery channels were likewise scattered across word of mouth, advertising, markets, and social media. This diversity challenges the common assumption that health messaging is the primary engine of alternative dairy adoption; in northern Benin, social influence and simple exploratory behavior appear equally decisive.

But the consumer group also exposed the sector’s structural weaknesses with unusual clarity. While 54.3 percent of consumers found the price acceptable, 25.9 percent considered it too high. Accessibility was rated as very good by only 40.7 percent, with nearly 60 percent reporting at least occasional difficulty obtaining the products. Most striking of all, 82.7 percent of consumers judged the promotion of goat milk products to be insufficient, a result that was highly significant. Even people who already buy and enjoy the products feel the sector is nearly invisible, a communication gap that the authors identify as a major constraint on market development.

The knowledgeable non-consumers told perhaps the most important story of the study. Their reasons for not consuming goat milk were spread almost evenly across product unavailability, unappealing taste, uncertain quality, high price, and preference for cow milk, with no single factor dominating. Their perceptions of the benefits were similarly uncertain: 25.97 percent believed goat milk was worse than cow milk, 24.68 percent were unsure, only 23.38 percent considered it beneficial, and 25.97 percent had no opinion. Familiarity with a product, in other words, does not automatically translate into knowledge of its properties. Yet this group was far from hostile. Cheese and yogurt each attracted the interest of 33.77 percent of respondents as products they might try, slightly ahead of fresh milk, hinting that processed forms, in which the characteristic goat flavor is attenuated, could serve as entry points for hesitant buyers.

The third group, people with no prior knowledge of goat milk, delivered the most optimistic findings. Half said they would try the products if given the opportunity, and another 25.64 percent would do so if provided with more information. Two-thirds, 66.67 percent, said they could potentially consider goat milk as an alternative to cow milk, and the same proportion indicated they would consume goat milk if it were locally produced. When asked which product they would most like to try, goat milk itself led at 46.15 percent, ahead of cheese at 28.21 percent and yogurt at 25.64 percent. The conditions these respondents attached to trying the products, including price reductions, better availability, recommendations from relatives, and proof of benefits, mirror the barriers reported by the other groups, reinforcing the conclusion that the obstacles are informational and economic rather than sensory or cultural.

The authors are careful to acknowledge the limits of their work. The survey covered only two localities, so the findings cannot be generalized to all of Benin’s ecological and cultural regions. The study did not systematically examine sensory dimensions such as taste and smell, which previous research has shown can be decisive for acceptance or rejection, nor did it explore in depth the cultural and traditional beliefs that shape deeply rooted eating behaviors. Because the data are cross-sectional, collected over a limited period, they capture a snapshot rather than a trajectory; perceptions may well evolve as availability improves and awareness campaigns take hold, suggesting a need for longitudinal follow-up.

Even with those caveats, the implications are substantial for anyone invested in West African food security and smallholder livelihoods. Goats are among the most widespread livestock species in Benin, valued for their adaptability and low production costs, yet their contribution to national milk production remains marginal because systems are oriented toward meat. Goat milk itself is nutritionally compelling, with high digestibility, a fatty acid profile rich in short- and medium-chain fatty acids, and substantial calcium and phosphorus, properties of particular relevance for children, the elderly, and people with cow milk intolerance. The new evidence suggests that unlocking this potential requires no single magic bullet but rather group-specific strategies: awareness campaigns on nutritional and health benefits aimed at the uninformed, improved availability, affordability, and quality assurance for the hesitant, and stronger distribution networks and marketing for everyone. The barrier, the study concludes, is not the product. It is the pipeline that connects it to the people who, by all indications, are ready to drink it.

Subject of Research: Consumer perceptions and acceptance of goat milk and its derived products in northern Benin

Article Title: Perceptions and attitudes of consumers and non-consumers towards goat milk and its derived products in northern Benin

Article References: Offoumon, O. T. L. F., Assani, A., Sanni Worogo, H. S., Okambawa, T., Zorobouragui, L., Adambi Boukari, Z. F., Alabi, C. A. D., Idrissou, Y., Attakpa, E. Y., & T. Alkoiret, I. (2026). Perceptions and attitudes of consumers and non-consumers towards goat milk and its derived products in northern Benin. Pastoralism: Research, Policy and Practice, 16, Article 16705. https://doi.org/10.3389/past.2026.16705

Image Credits: AI Generated

DOI: 10.3389/past.2026.16705

Keywords: goat milk, dairy products, consumer behavior, Benin, West Africa, food security, smallholder farmers, dairy value chain, consumer perceptions, market access, nutrition, livestock

The research team set out to answer two intertwined questions that have long frustrated foresters and conservationists working with the species. First, does the climatic origin of seeds, what biologists call the provenance, shape how well they germinate and how vigorously their seedlings grow? Second, how long can seeds be kept before they lose the ability to sprout? Both questions matter enormously for restoration programs, because producing seedlings at scale requires reliable seed supplies, and seed quality is known to depend heavily on both genetics and storage conditions. Previous studies had hinted that seeds from more humid zones germinate better than those from drier regions, and there was genuine scientific disagreement about whether Kigelia africana seeds behave as orthodox seeds, which tolerate drying and can be stored for years, or as more delicate material that deteriorates rapidly.

To resolve these uncertainties, the researchers collected mature fruits from populations spanning all three of Benin’s climatic zones: the Sudanian zone, represented by Tanguiéta and Kandi; the Sudano-Guinean zone, represented by Glazoué and Parakou; and the Guinean zone, represented by Kétou and Lalo. The fruits were transported to Parakou, cut into pieces, and covered with straw for seven to ten days to accelerate pulp decomposition before the seeds were extracted by hand, air-dried on absorbent paper, and stored in paper envelopes at room temperature. The team measured seed moisture content with a moisture meter and recorded an average of thirteen percent, which falls within the eleven to fifteen percent range recommended in earlier work for storing this species. Seeds were then divided into three storage categories: freshly collected, stored for one year, and stored for two years.

The experimental design was rigorous. The team applied nine treatments combining storage duration with soaking in room-temperature water for zero, twenty-four, or forty-eight hours, reflecting the common nursery practice of soaking hard-coated seeds to speed germination. Seeds were sown in plastic containers filled with forest soil at an open-air nursery at the Faculty of Agronomy of the University of Parakou, arranged in a randomized complete block design with three blocks. Germination was recorded daily, along with the time to first germination and the average germination duration. Once seedlings produced at least two leaves, they were transplanted into polyethylene bags, and their height, stem diameter, and leaf number were measured weekly for twelve weeks. The germination data were analyzed as time-to-event data using log-logistic models, and the effects of provenance and storage were tested with generalized linear mixed-effects models in the R statistical environment.

The headline result was unambiguous and, for nursery growers, sobering. Not a single seed stored for two years germinated, regardless of provenance or soaking treatment. Seeds stored for one year fared better but still lagged behind fresh material: mean germination was 65.22 percent for freshly collected seeds and 57.22 percent for one-year-stored seeds. Soaking helped the stored seeds somewhat, with one-year-stored seeds soaked for twenty-four hours reaching the highest mean germination rate of 65.00 percent, compared with 53.33 percent for unsoaked stored seeds and 52.00 percent for those soaked for forty-eight hours. The message is that every additional month in storage erodes viability, and beyond a single year the seed bank is effectively dead.

Provenance proved equally decisive. Seeds from the humid Guinean zone consistently outperformed the rest, germinating at 91 percent after twenty-four hours of soaking, 84 percent after forty-eight hours, and 85 percent without any soaking at all. By contrast, overall germination averaged 57 percent in the Sudano-Guinean zone and only 47 percent in the Sudanian zone. All treatments differed significantly, with non-overlapping confidence intervals at p below 0.001. The authors identify the Guinean zone as the most suitable seed source for propagating the species, a finding with immediate practical value for restoration planners who must decide where to source seed for outplanting across Benin’s varied landscapes.

Seedling growth told a more nuanced story. Seedlings from freshly collected seeds grew taller than those from stored seeds, and freshly collected seeds soaked for twenty-four hours produced the tallest plants, with statistically significant effects on height (estimate = 0.12, p < 0.001) and stem diameter (estimate = 0.06, p < 0.001). Yet the interaction between provenance and treatment was complex. In the Sudano-Guinean zone, soaking freshly collected seeds for twenty-four or forty-eight hours significantly reduced height growth, while soaking one-year-stored seeds significantly increased it. For diameter, unsoaked freshly collected seeds outperformed their soaked counterparts, and intriguingly, seedlings from unsoaked and soaked one-year-stored seeds grew better in diameter than those from unsoaked fresh seeds, suggesting that a year of storage can even have a positive effect on stem thickening under certain conditions.

Why do the seeds deteriorate so quickly? The authors point to the storage environment itself. The seeds in this study were kept at an average temperature of 26.8 degrees Celsius with relative humidity of 80 to 85 percent during the rainy season, both well above the conditions generally recommended for seed storage, since temperatures above 20 degrees and humidity above 70 percent compromise physiological quality and invite attack by microorganisms and insects. Uncontrolled fluctuations in temperature and humidity can progressively destroy seeds, destroying membrane integrity and compromising cellular synthesis. The finding also echoes work on Handroanthus spongiosus, a fellow member of the Bignoniaceae family, whose seeds deteriorated greatly after twenty-four months in permeable packaging at room temperature, hinting that rapid viability loss under ambient conditions may be a family-wide trait. The study contradicts earlier reports that soaking two-year-stored Kigelia seeds for twenty-four hours could raise germination to 80 percent, underscoring how much remains uncertain about this species’ storage physiology.

The provenance effects on growth are consistent with a broader pattern in tropical forestry. Genetic characteristics of tree populations are known to drive variation in seedling vigor, and comparable provenance effects have been documented in Cordia africana in Ethiopia and Pavetta crassipes in West Africa. Benin’s Kigelia populations span a diversity of soil and climatic conditions, which likely shaped local adaptation and reserve accumulation in seeds, influencing both dormancy and seedling performance. Interestingly, while Guinean-zone seeds germinated best, seedlings from the drier Sudanian zone grew taller on average, a reminder that germination success and seedling vigor are not the same thing and that matching seed source to planting environment requires care.

The practical conclusions are clear. Kigelia africana seeds should be sown fresh whenever possible, and never stored for more than one year if germination is the goal. A twenty-four-hour soak in room-temperature water is a reasonable pre-treatment, particularly for stored seeds, but its effects depend on where the seed came from and how long it has been kept. For conservationists racing to reverse the species’ decline, the study recommends climate-zone-specific seed management strategies, further research to pin down the exact storage limit, determination of seed physiological maturity at harvest, and genetic characterization of populations to understand seed longevity. As overexploitation continues to pressure wild populations across the species’ range, these findings turn a seemingly simple question, how long can a seed wait, into a decisive factor in whether one of Africa’s most iconic trees survives the century.

Subject of Research: Effects of seed provenance and storage duration on germination and seedling growth of the threatened African tree Kigelia africana in Benin

Article Title: Seed viability, germination, and seedling growth of Kigelia africana (Lam.) Benth. to provenance and storage duration

Article References: Yamontché, C., Wédjangnon, A. A., Akin, Y. Y., Kuiga Sourou, B. N., Houètchégnon, T., & Ouinsavi, C. (2026). Seed viability, germination, and seedling growth of Kigelia africana (Lam.) Benth. to provenance and storage duration. Discover Plants, 3(1), Article 377. https://doi.org/10.1007/s44372-026-00846-z

Image Credits: AI Generated

DOI: 10.1007/s44372-026-00846-z

Keywords: Kigelia africana, sausage tree, seed germination, seed storage, provenance, seedling growth, Benin, West Africa, forest restoration, seed viability, Bignoniaceae, plant conservation

The numbers behind the study are sobering. Analyzing satellite images from 1990, 2006, and 2022, the researchers documented a relentless transformation of the landscape around the reserve. Between 1990 and 2006, agricultural land, bare soil, and built-up areas expanded by anywhere from 40 to 283 percent, while dense forests, woodlands, and tree and shrub savannas contracted by 15 to 65 percent. The pace did not slow afterward: between 2006 and 2022, the deforestation rate reached 32 percent. For a reserve meant to safeguard biodiversity and store carbon in one of West Africa’s most heavily pressured ecological zones, those figures represent a profound management failure, and a puzzle about why protection on paper has not translated into protection on the ground.

To solve that puzzle, the team, led by Séverin Biaou of the University of Parakou together with colleagues at Korea University and partner institutions, turned to the people themselves. They surveyed 297 households across 12 villages surrounding the reserve, all of which sit in areas experiencing severe deforestation. The interviews probed how residents perceived the direct and indirect drivers of deforestation and forest degradation, how they judged changes in the vegetation around them, and which conservation strategies they would be willing to embrace. The researchers then used principal component analysis and structural equation modeling, statistical techniques that can trace networks of cause and effect among many variables at once, to connect demographic and economic characteristics to perceptions and, ultimately, to conservation behavior.

What villagers identified as the causes of forest loss is itself revealing. The most commonly cited direct driver was the collection of non-timber forest products, named by 55 percent of respondents, followed closely by agricultural expansion at 49 percent. This is notable because it suggests that everyday subsistence activities, rather than dramatic logging operations, are what communities see eating away at the forest. Non-timber forest products such as firewood, wild fruits, and medicinal plants are lifelines for rural West African households, and previous research has shown they contribute substantially to livelihood maintenance in northern Benin. When the very act of surviving depends on extracting forest goods, blaming the extractors becomes complicated, and conservation strategies that ignore this tension are likely to fail.

The indirect drivers villagers pointed to tell an even deeper story about structural pressure. A striking 69 percent of respondents cited a lack of agricultural land, and 66 percent pointed to declining soil fertility, while 33 percent identified human population growth. Together these perceptions sketch a vicious cycle familiar across the Sahelian and Sudanian zones: as land degrades and yields fall, farmers clear more forest to compensate, which in turn accelerates degradation. The study’s statistical models confirmed that these perceived indirect drivers were positively and significantly associated with support for conservation strategies, with a p-value below 0.001. In other words, the more clearly people recognized the underlying forces squeezing their landscape, the more likely they were to endorse measures to protect what remained.

The conservation strategies themselves reflected a pragmatic, community-centered ethic. Prohibiting tree cutting was the most popular option, endorsed by 82 percent of households, followed by planting native tree species at 81 percent, and practicing agroforestry, the integration of trees into croplands and pastures, at 48 percent. The strong preference for native species is ecologically significant: planting indigenous trees can increase biotic resistance to invasive plants and better support local biodiversity than exotic plantations. Agroforestry, meanwhile, has been shown in studies from Benin to Brazil to improve soil fertility and increase carbon storage in agricultural soils, offering a way to reconcile farming with forest cover rather than choosing between them.

But the study’s most consequential finding is that these perceptions are not evenly shared. Perceptions of deforestation drivers, ecosystem changes, and conservation strategies all differed significantly among ethnic groups. Age and ethnicity significantly shaped how people perceived the indirect drivers of deforestation, while income and ethnicity influenced perceptions of forest vegetation change. This matters because conservation programs are typically designed as one-size-fits-all interventions, rolled out uniformly across a landscape. If a Bariba farmer and a Fulani herder, or an elder and a young adult, understand the causes of forest loss in fundamentally different ways, a single message or incentive structure will resonate with some communities and fall flat with others. The researchers argue that policymakers and forest managers should develop targeted strategies that explicitly account for these socio-cultural differences rather than smoothing over them.

The methodological approach deserves attention in its own right. By pairing remote sensing with rural appraisal, the study triangulates two very different ways of knowing the forest. The satellite record provides objective, quantifiable evidence of land-cover change over three decades, while the household surveys capture the lived experience and interpretive frameworks through which residents make sense of that change. Structural equation modeling then bridges the two, testing whether the relationships implied by theory hold up in the data. This kind of integration is increasingly seen as essential in conservation science, because remote sensing can show that a forest is shrinking but cannot explain why people are cutting it down, or what would motivate them to stop.

The findings arrive at a critical moment for global forest policy. International efforts to promote biodiversity conservation and climate mitigation, from REDD+ programs to the Sustainable Development Goals, increasingly rely on reducing deforestation and forest degradation as a central pillar. Yet global assessments have repeatedly found that the world is far off track for halting forest loss by 2030. Studies like this one suggest a reason why: the proximate causes of deforestation, whether agricultural expansion or fuelwood harvesting, are embedded in local livelihoods and cultural contexts that top-down policies struggle to reach. When communities perceive land scarcity and soil decline as the real threats, conservation schemes that simply criminalize tree cutting without addressing those underlying pressures are unlikely to gain traction, no matter how well funded.

For the Trois-Rivières Forest Reserve specifically, the study offers a practical roadmap. The high levels of stated support for banning tree cutting and planting native species indicate genuine local willingness to act, provided interventions align with what communities already understand about their environment. Programs that pair reforestation with native species, promote agroforestry to relieve pressure on remaining forest, and tailor outreach to the specific ethnic and age groups within each village are far more likely to succeed than uniform mandates. More broadly, the research makes a compelling case that the knowledge held by forest-edge communities, the very people often cast as the problem, is in fact an indispensable resource for solving it. Listening to what villagers see when they look at their vanishing forest may be the most powerful conservation tool available.

Subject of Research: Local socio-cultural perceptions of deforestation drivers and conservation strategies in a tropical forest reserve in northern Benin

Article Title: Community Socio-cultural Knowledge of Deforestation and Forest Degradation Shapes Local Perceptions of Conservation Strategies in a Tropical Forest Reserve of Benin

Article References: Biaou, S., Noulèkoun, F., Salako, K. V., Mertens, B., Hounwanou, G. B., Kouton, B. N., Houehanou, T. D., Gouwakinnou, G. N., & Khamzina, A. (2026). Community Socio-cultural Knowledge of Deforestation and Forest Degradation Shapes Local Perceptions of Conservation Strategies in a Tropical Forest Reserve of Benin. Environmental Management, 76(9), Article 299. https://doi.org/10.1007/s00267-026-02602-1

Image Credits: AI Generated

DOI: 10.1007/s00267-026-02602-1

Keywords: deforestation, forest degradation, Benin, conservation, local perceptions, remote sensing, Landsat, agroforestry, non-timber forest products, ethnicity, structural equation modeling, tropical forest reserve

Dolutegravir belongs to a class of drugs called integrase strand transfer inhibitors. Rather than attacking reverse transcriptase, the enzyme that earlier generations of antiretrovirals targeted, it blocks HIV integrase, the viral enzyme that splices the virus’s DNA copy into the genome of the host cell. Because the drug binds tightly to the integrase active site and resists many common resistance mutations, it carries what virologists describe as a high genetic barrier: multiple mutations are typically required before the virus can replicate meaningfully in its presence. That property, combined with once-daily dosing and a favorable tolerability profile, is why the WHO endorsed dolutegravir-based regimens as preferred first-line therapy, and why Benin adopted the recommendation in 2019.

The new study was designed as a descriptive, cross-sectional assessment without a comparison group or a pre-dolutegravir reference cohort. The researchers, led by Edmond Tchiakpe of the University of Abomey-Calavi and Benin’s National Reference Laboratory of the Health Program Fighting Against AIDS, drew their participants from routine patients attending the laboratory program between January 1 and December 31, 2024. Viral load quantification was performed with the Abbott RealTime HIV-1 assay, a real-time polymerase chain reaction platform that counts copies of HIV-1 RNA in a milliliter of plasma. Following standard clinical definitions, a patient was classified as suppressed when the viral load was below 1,000 copies per milliliter, while any detected value at or above that threshold was treated as unsuppressed.

In total, 17,001 patients were included in the analysis. Women made up 70.3 percent of the cohort and men 29.7 percent, a distribution that mirrors the epidemiology of HIV in much of sub-Saharan Africa, where acquisition rates among women of reproductive age remain disproportionately high. Adults, who accounted for 92.1 percent of participants, were overwhelmingly treated with a backbone of tenofovir disoproxil fumarate or zidovudine combined with lamivudine and dolutegravir, written as TDF/AZT plus 3TC plus DTG. Children, 7.9 percent of the cohort, received a pediatric formulation built on abacavir or tenofovir with lamivudine and dolutegravir. Viral load and regimen data were extracted from facility registers, and the team applied univariate and multivariate logistic regression to test how regimen type, sex, and age related to virological outcomes.

The headline result is emphatic. Approximately ninety-one percent of all participants achieved viral load suppression below the 1,000-copy threshold. But that aggregate figure concealed a sharp divide between age groups: adults accounted for 92.8 percent of the suppressed patients while children represented only 7.2 percent, a difference the authors report as highly statistically significant, with a p-value below 0.0001. Among those who were suppressed, the researchers distinguished two states of residual viremia. Fully undetectable viral loads, meaning no measurable HIV-1 RNA, accounted for 68.5 percent of the suppressed group, while low-level replication viremia, detectable virus below the 1,000-copy threshold, made up the remaining 31.5 percent. That distinction matters clinically, because persistent low-level viremia can signal emerging adherence problems or the early stirrings of resistance, whereas complete suppression is the strongest guarantee of both individual health and blocked transmission.

Sex emerged as a second major axis of variation. The proportion of men with fully undetectable viral load was 24.6 percent, compared with 69.1 percent among women, a difference significant at p below 0.001. In the univariate analysis restricted to adults, men had roughly six percent lower odds of reaching an undetectable viral load than women, with an odds ratio of 0.94 and a p-value below 0.0001. Interestingly, when the analysis turned to the broader binary of suppression versus non-suppression, the sex difference largely dissolved: no statistically significant association between sex and viral load suppression was observed in the multivariable model, and male sex was associated with lower odds of undetectability with a modest adjusted odds ratio of 0.95. In children, the picture was one of parity, with boys at 3.1 percent and girls at 3.2 percent showing undetectable viremia, a difference that was not statistically significant.

The regimen comparison added a further layer. After adjusting for sex, and noting that age was entangled with regimen type and therefore excluded from the multivariable model, patients receiving the AZT or TDF backbone with lamivudine and dolutegravir had higher odds of achieving an undetectable viral load than those on the abacavir-based pediatric combination, with an adjusted odds ratio of 1.13 and a 95 percent confidence interval of 1.10 to 1.16. The same regimen was also associated with higher odds of suppression overall, at an adjusted odds ratio of 1.08 with a confidence interval of 1.06 to 1.10. The effect sizes are small, as is typical for registry-scale observational data, but the consistency across both outcome definitions suggests the difference is not merely statistical noise. It may also reflect the fact that the abacavir-containing regimen was concentrated in children, the group with the weakest suppression overall.

Why children fared so much worse than adults is a question the study raises but cannot fully answer with its descriptive design. Pediatric HIV care is notoriously difficult for reasons that have little to do with the drugs themselves. Weight-based dosing must be adjusted as children grow, pediatric formulations are less palatable and harder to stock in rural pharmacies, and young children depend entirely on caregivers to administer doses on schedule. Disclosure of HIV status to the child, a step associated with better adherence in adolescence, often happens late. The near-perfect parity between boys and girls in the pediatric cohort indicates that whatever drives the suppression gap, it operates at the level of age and care delivery rather than sex, which is itself a useful clue for program designers.

The sex gap among adults is equally consequential. Women were more likely to reach undetectable viremia, yet the study also found that the proportion of patients with viral loads above 1,000 copies per milliliter was higher in women than in men, meaning women occupied both tails of the distribution: more complete suppression, but also more overt failure. This bifurcation is consistent with patterns reported elsewhere in the region, where women engage with care earlier through antenatal screening but face interruption risks around pregnancy, postpartum periods, and partner disclosure. The authors’ finding that male sex independently predicted lower odds of undetectability, even after adjustment, suggests men’s engagement with viral monitoring itself may lag, since an undetectable result requires both adherence and regular laboratory follow-up.

For Benin’s national program, the practical message is twofold. First, the dolutegravir transition appears to be delivering on its promise at population scale, with suppression rates in adults approaching the levels seen in well-resourced settings and comfortably above the UNAIDS 95 percent suppression target’s trajectory. Second, the residual pockets of failure are now identifiable and concentrated: children on abacavir-based regimens and adults with low-level viremia rather than outright failure. Because the study was retrospective, cross-sectional, and lacked a pre-dolutegravir comparison group, it cannot definitively attribute the high suppression rates to dolutegravir alone, and the modest odds ratios around regimen and sex should be read as signals rather than proofs. Still, with seventeen thousand patients measured on a standardized platform, the dataset provides one of the most detailed snapshots to date of how integrase-inhibitor-based therapy performs in a West African national cohort, and it gives program managers a concrete map of where to direct adherence support, pediatric formulation improvements, and intensified viral load monitoring next.

Subject of Research: Real-world HIV-1 viral load suppression among patients on dolutegravir-based antiretroviral therapy in Benin

Article Title: High viral load suppression among HIV-1 infected patients receiving dolutegravir-based antiretroviral therapy in Benin, West Africa

Article References: Tchiakpe, E., Keke, R. K., Bachabi, M., & Yessoufou, A. (2026). High viral load suppression among HIV-1 infected patients receiving dolutegravir-based antiretroviral therapy in Benin, West Africa. BMC Infectious Diseases. https://doi.org/10.1186/s12879-026-14561-3

Image Credits: AI Generated

DOI: 10.1186/s12879-026-14561-3

Keywords: HIV-1, dolutegravir, antiretroviral therapy, viral load suppression, Benin, West Africa, integrase inhibitors, pediatric HIV, viremia, WHO guidelines, BMC Infectious Diseases, virological monitoring

The research, published in the journal Discover Forests, was conducted by a team led by Kolawolé Valère Salako of the University of Abomey-Calavi in Benin. Rather than treating seeds as interchangeable units, the researchers measured them the way a breeder might measure livestock, recording length, width, thickness, and weight for an extraordinary 9,330 seeds gathered from 63 mother trees across five protected areas and three distinct climatic zones in Benin, ranging from the humid Guineo-Congolian zone in the south to the dry Sudanian zone in the north. Each seed was individually labeled and measured with calipers precise to a hundredth of a millimeter, and mother trees were kept at least 100 meters apart to avoid sampling related individuals. The result is one of the most granular portraits of seed variation ever assembled for a threatened tropical timber species.

The first headline finding concerns climate. Across the rainfall gradient, seed traits shifted in a clear and consistent direction: the longest, heaviest, and thickest seeds came from the wettest zone, while the smallest and lightest came from the driest. Seed length averaged just over 20.8 millimeters in the wettest zone compared with about 18.8 millimeters in the driest, and seed weight followed the same trajectory. The only trait that refused to follow the trend was seed width, which remained remarkably stable no matter where the mother tree stood. The authors interpret this gradient as a possible adaptation strategy: under the biotic and abiotic stresses of drier climates, plants commonly produce smaller seeds, a pattern previously documented in other West African multipurpose trees such as tamarind. Seed weight, in particular, stood out as the most variable trait of all, with coefficients of variation exceeding 25 percent across zones and provenances.

But the deeper surprise lay in where the variation actually lived. Using linear mixed models and variance component analysis, the team decomposed the total phenotypic variation into its hierarchical sources: climatic zones, provenances within zones, trees within provenances, and seeds within trees. The answer upended the intuitive assumption that broad climate is the dominant driver. More than 75 percent of the variation occurred within climatic zones rather than among them, and the single largest share, ranging from roughly 31 to 56 percent depending on the trait, occurred within individual mother trees. Variation among trees accounted for 19 to 22 percent, and variation among climatic zones never exceeded 25 percent. In other words, a single Afzelia tree in one forest can produce a wider spread of seed forms than exists between entire regions hundreds of kilometers apart.

To probe this within-tree diversity further, the researchers turned to a technique borrowed from ecology: hypervolume analysis. After standardizing the four seed measurements and compressing them into a two-dimensional phenotypic space using principal component analysis, they constructed a hypervolume, essentially a multidimensional envelope, for each mother tree, quantifying how much of the total trait space that tree’s seeds occupied. The differences were striking. The most phenotypically expansive tree, designated AG4, produced a hypervolume of 45.06, while the most homogeneous, AG12, occupied only 9.39. Trees with large hypervolumes produce seeds spanning a broad range of sizes and shapes, whereas trees with small hypervolumes produce seeds of striking uniformity. Crucially, climatic zone had no statistically significant effect on either the hypervolumes or the within-tree coefficients of variation, pointing instead to microclimate and intrinsic maternal effects, the local conditions surrounding each individual tree and its own genetic makeup, as the primary architects of seed morphological diversity.

The team also estimated repeatability for each trait, a statistical proxy for heritability that asks how much of the variation in a trait is attributable to differences among mother trees rather than to environmental noise within them. Repeatability was highly significant for all four traits but varied in magnitude. Seed thickness and width showed low values, approaching zero in some cases, while seed length and seed weight showed moderate repeatability, between 0.33 and 0.37. That moderate figure matters enormously for restoration practice. It means that seed length and weight are partly inherited from the mother tree, so a nursery manager selecting seeds from trees that reliably produce large, heavy seeds has a reasonable chance of capturing that characteristic in the next generation. Traits with near-zero repeatability, by contrast, would offer no such predictive power.

Why does seed size matter so much for restoration? Previous work on Afzelia africana has shown that larger seeds germinate at higher final percentages, germinate faster on average, and produce seedlings with stronger early growth. Because the success of enrichment planting and assisted regeneration programs hinges on getting seedlings established in often harsh, fire-prone, and grazed landscapes, the morphological quality of the seed lot is not a trivial detail; it can be the difference between a restored stand and a failed one. The moderate heritability of length and weight, combined with their high variability, makes these traits the most promising targets for selection. The authors suggest that the wide within-tree variation itself may be an adaptive bet-hedging strategy: rather than putting all reproductive effort into one optimal seed type, a mother tree spreads the risk across a portfolio of offspring forms, ensuring that at least some are suited to whatever conditions the future holds.

Synthesizing the coefficient of variation and hypervolume results, the researchers identified nine mother trees as the most promising seed sources for restoration programs: AG4, RB1, AG3, AG7, PE14, 3R6, AG10, DK2, and 3R5. These elite individuals combine high morphological diversity with substantial intra-individual variability, meaning their seeds sample a wide slice of the species’ phenotypic space. Collecting from such trees, the argument goes, would maximize the adaptive potential of restored populations, giving the next generation the raw variation it needs to cope with uncertain and changing conditions. The authors are careful to note, however, that phenotypic diversity alone is not a complete selection criterion; germination performance, reciprocal transplantation trials, and genetic diversity assessments should complement the morphological data before any tree is crowned a definitive seed orchard founder.

The broader implications reach well beyond a single species. Restoration practitioners worldwide increasingly recognize that where seeds come from, and which individuals they come from, shapes the long-term resilience of planted forests. This study adds a crucial nuance: sourcing decisions based only on broad climatic matching, the standard provenance approach, would miss most of the relevant variation, because the majority of phenotypic diversity in Afzelia seeds resides within individual trees, driven by maternal micro-environments rather than regional gradients. For a vulnerable foundation species struggling to regenerate across sub-Saharan Africa, the message is both practical and hopeful. The genetic and phenotypic raw material for recovery may already be standing in the forest, scattered among a handful of remarkable mother trees, waiting to be identified, protected, and propagated. Future work combining common garden experiments with reciprocal transplants will test whether the elite trees identified here pass their advantages on through the full life cycle, from seed to sapling to canopy giant.

Subject of Research: Intraspecific phenotypic variation and repeatability of seed traits in Afzelia africana across climatic gradients in Benin

Article Title: Seed phenotypic variation and traits repeatability in Afzelia africana along a climatic gradient provide insights for seed sourcing in forest restoration

Article References: Salako, K. V., Lissanon, J.-E., Gandji, M. R. M., Kolawole, A. M., Akouete, P. L. E., Dogbo, F. S., Akakpo, A. D., & Glèlè Kakai, R. (2026). Seed phenotypic variation and traits repeatability in Afzelia africana along a climatic gradient provide insights for seed sourcing in forest restoration. Discover Forests, 2(1), Article 72. https://doi.org/10.1007/s44415-026-00131-7

Image Credits: AI Generated

DOI: 10.1007/s44415-026-00131-7

Keywords: Afzelia africana, seed phenotypic variation, forest restoration, climatic gradient, repeatability, heritability, seed sourcing, Benin, hypervolume analysis, maternal effects, phenotypic plasticity, tropical trees