The fall armyworm, Spodoptera frugiperda, is a multivoltine moth native to the Americas whose larvae devour an extraordinary range of vegetation, including economically critical crops such as corn, sorghum, and sugarcane. Since 2016, the species has invaded numerous countries across Africa, Asia, and Oceania, cementing its reputation as one of the world’s most destructive agricultural pests. Its population dynamics follow dramatic boom-and-bust cycles, and a key driver of those crashes is a naturally occurring pathogen: Spodoptera frugiperda multiple nucleopolyhedrovirus, or SfMNPV. This species-specific baculovirus is lethal to the armyworm and has even been deployed as a biopesticide. When a larva ingests viral occlusion bodies — protein-encased packages of double-stranded DNA visible under a light microscope — the virus proliferates inside its body until the larva literally liquefies, splattering virus-laden fluid onto the foliage where other larvae feed and continue the infection cycle.

But there is a second, darker route of transmission: cannibalism. Fall armyworms are notoriously cannibalistic, particularly in their later larval stages, and when a healthy larva consumes an infected conspecific, it risks swallowing a lethal dose of virus along with the meal. Researchers at the heart of the new study, led by Kale Rougeau and Bret Elderd, wanted to know how two major climate change stressors — rising temperature and declining resource quality — might alter this cannibalistic behavior and, in turn, the spread of disease. Rather than testing each stressor in isolation, they designed a fully factorial experiment combining three temperature regimes, four diet treatments, and two infection statuses, for a total of 480 individual larvae across 24 treatment combinations.

The temperature treatments were carefully calibrated using a thermal performance curve for the species. A cooler regime of 26°C days and 16°C nights approximated the armyworm’s thermal minimum, an optimal regime of 31°C and 21°C matched its thermal optimum, and a warmer regime of 34°C and 26°C sat just below its thermal maximum. To simulate the nutritional consequences of climate change, the team manipulated the protein-to-carbohydrate ratio of artificial diets. Rising atmospheric carbon dioxide dilutes nitrogen in plant tissue, lowering the protein available to herbivorous insects — a phenomenon known as nutrient dilution. The researchers created a high-protein diet with a 5:1 protein-to-carbohydrate ratio, an equal 1:1 diet, and a low-protein 1:5 diet, alongside a standard commercial diet as a baseline. Larvae fed their assigned diet for one full instar before entering the behavioral trials.

The experimental setup was elegantly simple. Fourth-instar larvae, starved for 24 hours, were placed in Petri dish arenas with either an infected or uninfected third-instar conspecific and a cube of their assigned diet. Infected conspecifics had received a lethal dose of 1 × 10⁵ SfMNPV occlusion bodies per microliter, and verification larvae confirmed that 100 percent of infected individuals died of viral liquefaction while no uninfected controls showed contamination. The arenas were checked for cannibalism at 1, 2, 4, 8, 16, and 24 hours, and surviving fourth instars were then reared through pupation so the team could measure fitness via pupal mass, a well-established proxy for fecundity in this species.

The results were striking. Cannibalism rates climbed steadily with temperature across every diet type, and the best-fit statistical model — selected using the small-sample-corrected Akaike Information Criterion — included a three-way interaction among temperature, diet, and conspecific infection status, accounting for 67 percent of the cumulative model weight. Temperature carried a significant positive effect, with a slope of 0.307 and a p-value below 0.0009. Larvae on the low-protein diet showed the highest overall odds of cannibalism, suggesting they were supplementing missing protein by eating their neighbors. Intriguingly, at cooler temperatures on the low-protein diet, infected conspecifics were cannibalized less readily than healthy ones — yet on the standard diet, infected individuals were more likely to be eaten regardless of temperature. Behavior, it turns out, depends on the full environmental context, not any single stressor.

What about disease? Among larvae that actually cannibalized infected conspecifics, temperature alone best predicted whether infection took hold, with a significant but modest positive slope of 0.117 — roughly one-third the size of the temperature effect on cannibalism itself. Only two individuals across all treatments became infected without consuming their conspecific, likely through trace viral contamination, and these were excluded so the analysis focused purely on cannibalism-driven transmission. The relatively weak direct effect of temperature on infection risk may reflect a biological quirk: each time a larva molts, it sheds the lining of its midgut, expelling recently consumed viral particles before the infection can establish. At higher temperatures, faster development and more frequent molting may partially counterbalance the elevated metabolic costs that otherwise leave insects more vulnerable to lethal infection.

The fitness results added another layer of nuance. Among the 199 moths that successfully eclosed, pupal mass declined with warming temperatures on all macronutrient-manipulated diets but remained stable on the standard diet, and the temperature-by-diet interaction model captured 85 percent of the model weight. Counterintuitively, larvae on the low-protein diet achieved the highest pupal masses — averaging about 184 milligrams compared with roughly 123 milligrams for high-protein larvae — possibly because cannibalism conferred a nutritional advantage to protein-deprived individuals. Notably, neither cannibalism status nor the infection status of the consumed conspecific predicted pupal mass, indicating no detectable fitness cost from sub-lethal viral loads among survivors.

The broader implications are twofold. First, as climate change brings more extreme heat and carbon-driven nutrient dilution degrades plant quality, cannibalism in fall armyworms — and perhaps in other readily cannibalistic herbivorous insects — is likely to increase, driven by a combination of heightened energy demands and protein scarcity. Second, because cannibalism is a transmission route for pathogens, more cannibalism could mean more disease spread, compounded by a slight direct increase in infection risk from temperature alone. Yet the picture is not uniformly grim for the virus: eating an infected conspecific does not always lead to infection, so cannibalism can also remove pathogens from a population. The study’s authors point out that contrasting systems behave differently — warmer temperatures reduce viral transmission in gregarious western tent caterpillars, which disperse rather than congregate in the heat, and diminish fungal infection in spongy moths under warmer, drier conditions.

What happens next for the fall armyworm may depend on geography as much as biology. Climate projections suggest the pest will proliferate in some regions while facing local extinction in areas already near its critical thermal maximum. Changes in cannibalistic behavior and baculovirus transmission could further shape how the species spreads globally, altering both the intensity of crop damage and the efficacy of viral biopesticides. The research team suggests that field experiments and in silico modeling of these coupled dynamics are natural next steps. For now, the message is clear: climate change does not simply make the world hotter — it makes hungrier, more desperate creatures out of the insects that threaten our food supply, and in doing so, it quietly redraws the map of disease.

Subject of Research: Effects of temperature and diet quality on cannibalism and baculovirus transmission in fall armyworm larvae

Article Title: We Are Dying to Eat You: Cannibalism and Disease Transmission Under Global Climate Change

Article References: Rougeau, K., & Elderd, B. D. (2026). We Are Dying to Eat You: Cannibalism and Disease Transmission Under Global Climate Change. Ecology and Evolution, 16(10), Article e74403. https://doi.org/10.1002/ece3.74403

Image Credits: AI Generated

DOI: 10.1002/ece3.74403

Keywords: fall armyworm, cannibalism, baculovirus, climate change, disease transmission, nutrient dilution, insect behavior, host-pathogen dynamics, agricultural pest, pupal mass, temperature, ecology

One of the review’s central contributions is conceptual housekeeping. Species are routinely labelled as social or solitary, yet those labels depend heavily on the criteria applied — estimates of how many mammal species are solitary range from more than two-thirds to less than a quarter depending on the study. Even so-called solitary species, from semi-nomadic orangutans to seemingly asocial carnivores, engage in repeated, non-random interactions that build genuine social structure. The authors therefore distinguish sociability, an individual-level tendency, from sociality, a property of groups and species, and stress that sociability is not a single unitary trait. It can be expressed through spatial proximity, affiliative contact such as grooming, or preferences for specific partners, and it can be measured with everything from simple observation counts to sophisticated social network analysis. This definitional tangle, they argue, has produced apparently contradictory findings across the literature and has left sociability among the least consistently studied of the classic animal personality axes, alongside boldness, activity, exploration and aggressiveness.

Crucially, consistent individual differences in sociability do not mean fixed behaviour. Individuals can shift their expressed sociability with conditions while repeatable differences among them persist, and they can even differ in how plastic they are. In common bottlenose dolphins, for example, individuals varied in how their gregariousness responded to short-term swings in food availability, even though the population’s overall social structure stayed stable. These individual behavioural reaction norms may themselves be heritable and subject to selection, meaning that environmental change can act on sociability through reversible within-individual plasticity, through developmental shifts in social tendencies, or through selective and demographic processes that change which social phenotypes exist in a population at all.

The feedbacks between individuals and their social worlds are where the review becomes genuinely striking. Individual tendencies build relationships, relationships build networks, and networks feed back to shape individual behaviour. A famous population of olive baboons illustrates the point: after tuberculosis removed the most aggressive males, the remaining group became markedly more tolerant, and this ‘pacific culture’ persisted even after every original male had been replaced by immigrants. In pig-tailed macaques, experimentally removing a handful of individuals that performed policing roles caused networks to become smaller, less diverse and less integrated. Such ‘keystone’ individuals — brokers, gatekeepers, social hubs — can stabilise or destabilise group-level structure out of all proportion to their numbers, a fact with obvious implications when humans remove animals from the wild.

Turning to the drivers of change, the review distinguishes indirect effects, such as habitat modification, climate change and pollution, from direct effects of human presence and lethal removal. Habitat change cuts both ways: structurally simple environments can push fish into larger, more cohesive shoals, while increased complexity can funnel sleepy lizards into shared pathways and boost social connectivity. In southern pig-tailed macaques ranging inside oil palm plantations, affiliative interactions dropped and aggression rose, while at plantation edges grooming rates and partner diversity were actually higher than in forest — but with low-ranking individuals, not high-ranking ones, occupying the most central network positions. Perceived risk and visibility, the authors suggest, can matter as much as food. Grey wolves exposed to intensifying human landscape modification showed reduced pair cohesion, suggesting that simply avoiding disturbance can quietly erode social bonds.

Climate change acts through temperature, resources and catastrophe. Warming can dissolve the thermal benefits of huddling: bushtits abandon dense communal roosts once temperatures rise, and modelling for desert night lizards predicts far fewer survival-enhancing aggregations in a hotter future. In sociable weavers, hot and variable temperatures increase panting and produce more fragmented social networks. In sticklebacks from warmer habitats, sociability is lower, heritable, and — tellingly — no longer repeatable across trials in warm-acclimated fish, hinting that warming may destabilise the very consistency that makes sociability a personality trait. Resource shifts are equally ambivalent. Ravens rely on roost-based alliances to access carcasses when food is scarce but abandon those ties when it is plentiful; Bornean orangutan females reduced association rates and increased aggression after fires caused prolonged fruit scarcity; and southern resident killer whales formed smaller, less interconnected groups in years of low Chinook salmon abundance.

Catastrophic events reveal the sharpest trade-offs. After hurricanes, rhesus macaques expanded their affiliative networks, with previously isolated individuals building new connections — a seemingly adaptive surge of social support under stress. But simulations showed that infection risk doubled and remained elevated for up to five years, and became more evenly spread across social ranks as low-ranking animals gained partners. Black howler monkeys suffered population crashes and prolonged social disorganisation after hurricanes, with interaction rates never fully recovering. The recurring lesson is that short-term social buffering can carry delayed epidemiological and structural costs, a pattern the authors identify as one of the most consistent themes across systems.

Pollution adds another layer of subtlety. A meta-analysis of fish studies found that chemical pollutants and artificial light consistently reduce individual sociability while leaving group cohesion unchanged, whereas mixtures of pollutants increased individual sociability but reduced cohesion — decoupling individual tendencies from emergent group properties. Pharmaceutical contaminants act directly on behaviour-regulating neurology: the anxiolytic oxazepam reduced shoaling in European perch, while fluoxetine increased shoaling in guppies only under specific social conditions. Noise pollution is similarly double-edged, tightening flock clustering in some birds as an apparent antipredator response while degrading the vocal communication that maintains social connectivity in others, such as red-backed fairy-wrens.

Direct human contact produces its own tangle of effects. Ground squirrels habituated to people and dogs showed reduced affiliative behaviour, whereas natural predators promoted cohesion — humans, the review notes, act as a qualitatively distinct class of disturbance. Urban macaques that spent more time monitoring humans groomed less and had fewer partners, consistent with a time-constraint mechanism, while semi-provisioned Assamese macaques with access to energy-rich human food spent less time feeding and more time socialising. The most sobering evidence concerns lethal removal. Vancouver Island marmots undergoing population decline experienced what the authors call a social ‘meltdown’ — smaller colonies, fewer greetings, more aggression, more vigilance and less feeding — that constrained recovery. Killer whale networks proved robust to random removals but fragmented when socially central juvenile females were targeted, as historical live captures did. Simulated poaching of central individuals reduced connectivity in elephant networks, and wolf packs destabilised by human-caused mortality lost reproductive output even without immediate declines in abundance. In elephants, the loss of older matriarchs also erodes ecological knowledge precisely when it is most needed under stress.

The conservation implications are concrete. Network-informed vaccination in wild chimpanzees could prevent large outbreaks with far fewer doses than random strategies, yet targeted removal of highly connected Tasmanian devils failed to control facial tumour disease because network positions shifted seasonally — the utility of such interventions hinges on how stable individual sociability really is. Social transmission can also spread problematic behaviours, as models of California sea lions stealing from fishing gear showed: culling works best before social learning amplifies recruitment. Translocation outcomes, invasion dynamics in guppies, and even responses to monitoring drones in guanacos all depend on social context. The review’s bottom line is that behavioural diversity deserves recognition as a component of biodiversity in its own right: preserving variation in individual social phenotypes and in the relationships they create may be critical for resilience, because populations are not merely collections of mean trait values but living networks whose architecture humans are quietly, and sometimes irreversibly, rewiring.

Subject of Research: Effects of anthropogenic environmental change on animal sociability and its population-level consequences

Article Title: Sociability Under Anthropogenic Change: From Individual Behaviour to Population‐Level Consequences

Article References: Sociability Under Anthropogenic Change: From Individual Behaviour to Population‐Level Consequences. (n.d.). https://doi.org/10.1002/ece3.74205

Image Credits: AI Generated

DOI: 10.1002/ece3.74205

Keywords: animal behaviour, sociability, animal personality, social networks, anthropogenic change, climate change, pollution, habitat fragmentation, conservation, wildlife management, social learning, disease transmission

The review, conducted by Paulo Chiza Athumani and colleagues at the University of Dodoma and published in the journal Discover Conservation, followed rigorous PRISMA guidelines for scoping reviews. The team searched Google Scholar, Scopus, and EBSCOhost using carefully constructed Boolean search strings combining terms for the two species with keywords covering socio-ecological impact, economic damage, crop loss, and pest management. From an initial haul of 643 publications, the researchers screened titles and abstracts, assessed full texts, and ultimately included 59 studies for analysis. Because the two species differ so markedly in how their impacts are measured, the authors could not compare them metric by metric. Instead they used a frequency-of-reporting framework, counting how often each type of impact appeared across the literature.

The headline finding is a stark asymmetry in research attention. The red-billed quelea dominated the literature, appearing in 73 percent of the included studies, most of which concentrated on economic damage and control measures. The Indian house crow attracted fewer papers, but those studies spanned a far wider range of topics, from biodiversity loss and disease transmission to competition with native birds and urban nuisance. Geographically, the picture splits just as cleanly. Quelea research is spread across Western, Eastern, and Southern Africa, reflecting the bird’s vast range and its status as arguably the most economically significant agricultural pest in sub-Saharan Africa. House crow studies cluster along the coasts, particularly in East Africa, where the species first established itself and where its invasion is most pronounced, though the bird is steadily pushing inland.

The quelea’s weapon is sheer numbers. Moving in enormous flocks that track rain fronts and the annual grasses they feed on, queleas descend on farmlands and consume tons of grain daily. The review compiles the staggering arithmetic of this appetite: annual losses of rice and small grains across Africa exceed US$54 million, with reported yield losses reaching 81 percent in maize, 55 percent in wheat, and 55 percent in almonds in southern Africa. Crops such as maize, rice, sorghum, groundnuts, and wheat all fall within the bird’s destructive reach, making it a direct threat to food security in some of the world’s most agriculture-dependent economies. Notably, the quelea’s impact is almost entirely economic; the review found no evidence that it preys on other birds, damages infrastructure, or disrupts tourism, a consequence of its specialized granivorous diet.

The house crow is a different kind of menace, one whose damage radiates outward through ecosystems. Five African studies documented the species preying on, harassing, and destroying the nests of native birds, from small weavers to the much larger black-headed heron, producing measurable biodiversity losses. In Tanzania, house crows have been linked to declining lizard populations. They compete aggressively with the native pied crow, often outcompeting it and surpassing it in numbers across invaded areas. Perhaps most alarmingly for public health, house crows are recognized vectors of an extraordinary catalogue of zoonotic pathogens, including Salmonella, Shigella, Escherichia coli, Campylobacter, influenza A subtype H5N1, chlamydiosis, avian tuberculosis, Newcastle disease virus, and West Nile virus, along with parasites such as Plasmodium, Toxoplasma, and Trypanosoma. In urban areas they snatch food from people, attack tourists, generate relentless noise, and contaminate open water sources with their excreta, while near airports they pose genuine aviation hazards through bird strikes.

The review also catalogued what the two species do not do, and these absences carry their own ecological significance. Neither bird has been documented hybridizing with other species in Africa, a relief given that hybridization occurs in an estimated 10 to 20 percent of bird species and can erode the vigor of native populations or even drive them extinct. Nor has brood parasitism been recorded for either species on the continent, though the authors note an intriguing opportunity: in India, the Asian koel parasitizes house crow nests, a natural mechanism that could theoretically be harnessed for biological control. Equally striking is the absence of predators attacking the house crow in Africa. One study even reported queleas being taken by spotted hyenas in Namibia, yet no organism has been documented preying on house crows, whose carcasses scavengers reportedly ignore. This predator-free status may partly explain the crow’s rapid spread from its coastal strongholds.

Against these threats, humanity’s countermeasures have evolved dramatically over the review’s fifty-year window. Traditional approaches, scarecrows, manual scaring, and nets, have given way to technological solutions including drones, autonomous deterrence systems, solar-powered acoustic repellers, and IoT-based virtual fences. Most recently, researchers have proposed machine learning approaches that promise more targeted and ecologically responsible control. Yet the review’s assessment is blunt: no method has achieved full effectiveness. The house crow’s intelligence makes it a particularly elusive target, as the birds quickly learn to evade new measures. Worse, some of the most effective tools carry heavy collateral costs. Chemical control of queleas, especially aerial spraying of the organophosphate fenthion, kills non-target species, contaminates ecosystems, and raises the specter of poisoned birds entering local food supplies.

These trade-offs push the problem beyond ecology into ethics and governance. The review highlights a tension that is becoming increasingly familiar in conservation technology: the same smart monitoring systems and drone cameras that track pest bird movements around farms and villages can also capture images, locations, and daily routines of nearby residents, raising serious questions about data security and privacy if such information is stored or shared without proper safeguards. The authors argue that effective management of both species demands a framework integrating ethical responsibility, legal compliance, human health protection, and meaningful community involvement. Communities, after all, bear the brunt of crop damage and sanitation problems, and their participation is critical for monitoring outbreaks and implementing interventions on the ground.

Human attitudes toward the two birds add another layer of complexity. Only one study each has examined community awareness and perceptions of the house crow and the quelea in Africa, a gap the authors identify as a critical research priority. What is known suggests both species are widely regarded as pests and even as sources of poverty, yet the quelea occupies a paradoxical position: it is simultaneously a feared agricultural destroyer and a food source harvested and consumed by local communities, a duality that shapes both tolerance and control. This ambivalence matters, because management interventions that ignore social acceptance and compliance are far more likely to fail. The review also flags a broader data problem: most studies lack quantitative monetary estimates of damage, making it impossible to compare the two species’ economic costs on standardized terms or to prioritize interventions on solid evidence.

The study’s ultimate message is that origin matters less than behavior. Whether a species is native, like the quelea, or invasive, like the house crow, if it acts as a pest it inflicts real damage on human livelihoods and ecosystems alike. The quelea primarily attacks the economic sector through its voracious consumption of grain, while the house crow strikes on multiple fronts, ecological, economic, and public health, even if its individual economic toll is comparatively smaller. As climate change reshapes rainfall patterns, human tolerance shifts, and policy frameworks remain unstable, the interactions between people and these two birds are set to intensify. The authors call for advanced, sustainable, and community-supported control strategies, better integration of emerging technologies with environmental safeguards, and a substantial expansion of research into the human dimensions of the conflict. After fifty years of study, the war against Africa’s pest birds is far from over, but for the first time the battlefield has been mapped.

Subject of Research: Comparative socio-ecological and economic impacts and control of the invasive Indian house crow and the native red-billed quelea in Africa

Article Title: Comparison of socio-ecological and economic impact and control techniques of the invasive Indian house crow (Corvus splendens) and the red-billed quelea (Quelea quelea) in Africa: a scoping review

Article References: Comparison of socio-ecological and economic impact and control techniques of the invasive Indian house crow (Corvus splendens) and the red-billed quelea (Quelea quelea) in Africa: a scoping review. (n.d.). https://doi.org/10.1007/s44353-026-00083-1

Image Credits: AI Generated

DOI: 10.1007/s44353-026-00083-1

Keywords: Indian house crow, red-billed quelea, invasive species, pest birds, crop damage, food security, Africa, disease transmission, biodiversity loss, pest control, scoping review, human-wildlife conflict

The investigation began with a deceptively simple behavioral question: given a choice, do mosquitoes prefer well-fed or undernourished hosts? Using controlled dietary restriction in laboratory mice, the researchers ran paired preference assays with multiple medically important mosquito species and found a consistent and striking result. Female mosquitoes preferentially oriented toward and fed on the undernourished animals. Because host-seeking in mosquitoes is governed by a layered integration of sensory cues, including carbon dioxide, heat, humidity, vision, and above all odor, the team reasoned that nutritional status might be altering the volatile chemical signature that hosts emit into the air. Behavioral experiments in which cues were selectively masked or manipulated confirmed that the differential attraction was olfactory in nature, pointing the investigators toward the skin surface as the source of the signal.

Gas chromatography-mass spectrometry analysis of volatile emissions from the skin of undernourished mice revealed a specific chemical culprit: elevated levels of volatile aldehydes. When these aldehydes were presented to mosquitoes in isolation or applied to otherwise unattractive hosts, they acted as potent attractants, reproducing the preference pattern observed with live undernourished animals. The aldehydes were not produced by the hosts themselves. Instead, they emerged from an unexpected intermediate player, the community of commensal bacteria that colonizes the skin. Sequencing and culture-based analyses showed that undernutrition was associated with a marked dysbiosis of the skin microbiota, with certain bacterial taxa proliferating to excessive densities and shifting their metabolic output toward aldehyde production. In effect, the mosquito-attractive odor was a microbial byproduct, released in greater quantities whenever the host’s nutritional state deteriorated.

The next question was mechanistic: why would a poor diet destabilize the skin microbiome in the first place? The answer lay in the dermal sebaceous glands, the microscopic structures that secrete sebum, a lipid-rich film coating the outer skin. The researchers found that undernutrition impaired the secretion of free fatty acids from these glands. Free fatty acids are not merely structural components of the skin barrier; they possess well-documented antimicrobial activity, suppressing the overgrowth of bacteria on the surface. With fatty acid output diminished, this chemical shield weakened, and commensal skin bacteria expanded unchecked. The team demonstrated this causal chain experimentally: restoring antimicrobial fatty acids, or reducing bacterial loads with antibiotics, both reversed the microbiota expansion and abolished the excess aldehyde emissions, thereby eliminating the heightened attractiveness of undernourished mice to mosquitoes.

To rule out confounding factors such as fur and general husbandry, the researchers extended their experiments to SKH1 hairless mice, in which skin surface chemistry can be sampled directly. The same pattern held. Undernutrition drove sebaceous dysfunction, skin bacterial overgrowth, dysbiosis, elevated aldehyde production, and increased mosquito attraction, providing a clean replication of the mechanism in a model system where the skin itself is fully accessible to analysis. The authors also showed that the effect operates in both directions of the transmission cycle. Undernourished mice were not only more likely to be bitten; they were also more susceptible to infection with dengue virus (DENV), developing higher viral loads. When mosquitoes fed on these viremic, undernourished hosts, the insects acquired virus more efficiently, and when infected mosquitoes subsequently fed, transmission onward was enhanced.

This dual effect, increasing both the probability that a host infects a mosquito and the probability that an infected mosquito infects a host, is what gives the finding its epidemiological weight. Vector-borne pathogens depend on a chain of events, each of which carries a probability, and interventions that raise or lower any single link can have outsized effects on the reproduction of an epidemic. By strengthening two links at once, host attractiveness and host infectivity, undernutrition may function as a critical modulator of transmission efficacy at the population level. The researchers present a model in which the prevalence of undernourished individuals within a community critically shapes the intensity of arbovirus circulation, a proposition with obvious implications for the geography of disease burden.

The human relevance of the mechanism was tested directly. In a cohort of undernourished human subjects, the team documented skin microbiota alterations mirroring those seen in mice, alongside elevated emission of volatile aldehydes from the skin. In behavioral assays, undernourished participants were more attractive to mosquitoes than their well-nourished counterparts. These converging lines of evidence, spanning rodent models, chemical analytics, microbiology, and human physiology, elevate the study beyond a correlation and support a coherent biological narrative: caloric and nutritional insufficiency suppresses sebaceous antimicrobial output, permits bacterial overgrowth, changes the skin’s volatile signature, and rewires the chemical conversation between humans and mosquitoes.

The broader context is sobering. Undernutrition and mosquito-borne disease overlap extensively across the tropics and subtropics, where food insecurity, poverty, and endemic dengue, malaria, Zika, and other arboviruses co-occur. Earlier work from the same field had established that host nutritional status can influence arbovirus virulence and evolution, and that host serum iron modulates dengue virus acquisition by mosquitoes, indicating that diet intersects with vector-borne transmission at multiple physiological levels. The new study adds skin chemistry and microbiota to this list and identifies a targetable axis. If aldehyde emissions and bacterial overgrowth mediate the effect, then interventions that restore sebaceous antimicrobial lipids, modulate the skin microbiome, or neutralize aldehyde cues could, in principle, reduce the excess bite risk borne by malnourished individuals, complementing bed nets, repellents, and vaccines.

For public health planners, the message is that nutritional support programs may double as disease control programs. Addressing undernutrition in regions where mosquito-borne pathogens are endemic would not only alleviate the direct morbidity and mortality of deficiency itself, but could also dampen the transmission cycles that keep those pathogens circulating. The authors argue that undernutrition should be recognized as a key driver of mosquito-borne disease transmission in nature, a reframing that places nutrition squarely within the toolkit of vector-borne disease control. As climate change expands the range of Aedes and Anopheles vectors and as food insecurity persists or worsens in many endemic regions, understanding and disrupting the metabolic link between diet, skin microbiota, and mosquito behavior may prove essential to bending the curves of some of the world’s most persistent epidemics.

Subject of Research: How undernutrition increases host attractiveness to mosquitoes and promotes the transmission of mosquito-borne diseases through skin microbiota changes.

Article Title: Undernutrition enhances host attractiveness to mosquitoes and transmission of mosquito-borne diseases

Article References: Wang, M., Song, X., Zhu, Y., Niu, J., Wang, G., Wang, Y., Xiao, H., Lei, D., Wu, T., Liu, L., Wang, P., Wang, J., & Cheng, G. (2026). Undernutrition enhances host attractiveness to mosquitoes and transmission of mosquito-borne diseases. Cell Research. https://doi.org/10.1038/s41422-026-01291-z

Image Credits: AI Generated

DOI: 10.1038/s41422-026-01291-z

Keywords: undernutrition, mosquito-borne diseases, dengue virus, skin microbiota, volatile aldehydes, sebaceous glands, fatty acids, host-seeking behavior, arboviruses, vector biology, malnutrition, disease transmission