The idea of the fluvial anthroposphere differs from the better-known Anthropocene. Rather than defining a single stratigraphic moment when humanity began leaving its mark on the geological record, the fluvial anthroposphere describes a long, uneven, and locally variable transition from natural to human-dominated river landscapes. This transition unfolded at different times in different places, shaped by societal responses, technological innovations, and ecological feedbacks. In the humid lowlands of central Europe, the shift began remarkably early, sometimes as far back as the Neolithic period in the sixth millennium BCE, as documented in Belgian catchments such as the Dijle and Gete rivers and in eastern German lowlands. In low-mountain ranges, however, the transformation often came much later, frequently not before the Middle Ages between roughly 500 and 1500 CE.

The Wiesent River catchment offers an ideal natural laboratory for studying this delayed transformation. Covering 1040 square kilometers of the northern Franconian Alb, the catchment has been settled since the Neolithic yet has remained overwhelmingly rural, without major cities, monasteries, or industrial centers. This makes it possible to assess the cumulative effects of ordinary human activities, such as small-scale agriculture and village life, without the overwhelming signal of urbanization. The river itself runs 78 kilometers from its source near Steinfeld to its confluence with the Regnitz near Forchheim, cutting through a karstic plateau of Jurassic limestone and dolomite that rises to around 450 meters above sea level. Deeply incised valleys, typically only 50 to 70 meters wide, confine the floodplains and concentrate the sedimentary record.

To reconstruct the valley’s history, the team combined a comprehensive multidisciplinary review with the first geoscientific field investigations. The review synthesized environmental data, archaeological findings, medieval and early modern documents, administrative records, place-name analysis, and archival maps. The fieldwork included electrical resistivity tomography, a geophysical technique that maps subsurface resistivity variations to reveal buried sediment bodies and ancient channel fills, along with percussion drilling and laboratory analysis of sediment cores. At the Höfen site, roughly two kilometers south of Hollfeld, the researchers extracted cores up to four meters deep and analyzed grain size distributions and organic content using the sieve and pipette method and loss-on-ignition measurements.

The stratigraphy that emerged tells a striking story. At the base of the sequence lie dark, organic-rich silty clays and peat, locally more than 40 centimeters thick, deposited during the Early Holocene when the valley floor was a waterlogged, marsh-like environment with weakly defined, anastomosing channels. Comparable peat sequences in the neighboring Aufsess River catchment have been dated to around 7400 years ago. Above these organic deposits, thin layers of well-rounded limestone and dolomite gravel record short episodes of high-energy flooding during the Middle to Late Holocene. Capping everything is the most dramatic unit: up to three meters of homogeneous, brown-beige silty to loamy overbank deposits with low organic content, laid down by repeated flooding as fine sediment washed off eroding hillslopes.

This three-meter blanket of floodplain loam is the fingerprint of human land use. The review shows that deforestation began in the Neolithic through rotating slash-and-burn cultivation, but intensified dramatically in the Middle Ages, a process preserved in place names bearing the suffix -reuth, which denote large-scale forest clearances. From the eleventh and twelfth centuries onward, village formation, settlement nucleation around churches and manorial centers, and the spread of the open-field system accelerated soil erosion on slopes. Sheep grazing amplified the effect: by the 1850s, manorial sheep farms in the region kept as many as 177,000 animals in total, and their grazing on steep valley slopes stripped vegetation cover and delivered sediment directly to the river system. Previous work in the Aufsess catchment dated the onset of sustained overbank deposition to between 2400 and 3000 years ago, with sedimentation rates eventually reaching up to two millimeters per year.

Human intervention extended beyond the slopes to the river itself. Historical sources document mills with mill races, small weirs, water wheels, and irrigated water meadows throughout the catchment, all of which altered flow conditions, sediment trapping, and channel morphology. The demand for winter fodder for the growing sheep flocks likely drove the construction of water meadows, which in turn reshaped how sediment moved between slopes, floodplains, and channels. Archival records from the sixteenth century onward reveal frequent disputes over water use among farmers, millers, and timber rafters, and nineteenth-century petitions to repair eroded river banks describe the loss of hundreds of square meters of farmland. Even the famous juniper heaths of the Franconian Alb, often mistaken for pristine nature, are revealed as cultural landscapes created by centuries of continuous grazing pressure.

The study also highlights a crucial complication in reading sediment archives: the response of rivers to human pressure is neither immediate nor linear. Eroded soil is often stored temporarily as colluvium on slopes or at foot-slope positions before eventually reaching the floodplain, a phenomenon known as the sediment cascade. This temporal decoupling between erosion and deposition means that layers of floodplain sediment may lag centuries behind the land-use changes that triggered them. In the Wiesent catchment, gullies up to ten meters deep near the confluence of the Aufsess and Wiesent rivers testify to severe historical soil erosion, while the absence of subfossil oak trunks in Main River deposits after around 1200 BCE has been interpreted as evidence of widespread deforestation upstream.

Climate, the researchers emphasize, played a comparatively minor role in this particular story. While events such as the 8.2 ka cooling, the Löbben Oscillation around 1600 BCE, the Medieval Climate Optimum, and the flood-rich phases of the Little Ice Age certainly influenced discharge and flood frequency, the long-term morphology and sediment dynamics of the floodplain appear dominated by anthropogenic disturbance. The close correspondence between the historical review and the empirical field data, the authors argue, confirms the Wiesent floodplain as a high-resolution archive of human-induced fluvial change. With its rural character, well-preserved stratigraphy, and absence of industrial contamination, the catchment is now positioned as a key study area for future work within the German Research Foundation’s priority programme on the fluvial anthroposphere, offering a template for disentangling human impacts from natural background processes in river systems across Europe.

Subject of Research: Human-induced transformation of the Wiesent River floodplain in northern Bavaria from wetland to human-dominated fluvial landscape since the Holocene

Article Title: The fluvial anthroposphere of the Wiesent River catchment, northern Bavaria, Germany: review and first results

Article References: Grimm, B. E. W. W., Voigt, A., Dix, A., Schreg, R., & Fuchs, M. (2026). The fluvial anthroposphere of the Wiesent River catchment, northern Bavaria, Germany: review and first results. E&G Quaternary Science Journal, 75(1), 49-67. https://doi.org/10.5194/egqsj-75-49-2026

Image Credits: AI Generated

DOI: 10.5194/egqsj-75-49-2026

Keywords: fluvial anthroposphere, floodplain, Wiesent River, Franconian Alb, sediment cores, electrical resistivity tomography, soil erosion, medieval land use, deforestation, sheep grazing, Holocene, geoarchaeology

The research, published in the British Ecological Society’s Journal of Applied Ecology, is among the most comprehensive field investigations yet conducted into competition between managed honey bees and wild pollinators on temperate heathland. Across a full flowering season running from May to September, the team surveyed plant and pollinator communities at 20 moorland sites spread across Scotland. The design deliberately contrasted plots with and without introduced honey bee apiaries, and compared land that was actively grazed and burned using traditional muirburn practices against land left to regenerate naturally. This paired structure allowed the researchers to separate the effects of beekeeping from the effects of routine livestock and vegetation management, something earlier studies had rarely achieved at this scale.

The sheer volume of data collected gives the findings considerable weight. The team recorded more than 1.6 million individual flowers and documented over 5,000 plant-pollinator interactions, spanning 58 plant species and 405 pollinator species. Ten of the study sites hosted commercial apiaries, each averaging 34 hives, which were monitored during the peak of the heather bloom when beekeepers traditionally bring their colonies onto the moors. This is the moment when ling heather erupts into a mass of purple blossom, offering one of the richest nectar resources in the British uplands and producing the famously aromatic heather honey prized by beekeepers across Europe.

Against expectations, the arrival of these hives produced only a modest signal in the ecological data. The presence of honey bees caused a small change to the structure of plant-pollinator networks, the webs of interactions linking flowers to the insects that visit them, but had no measurable effect on the quantity or quality of pollen collected by bumblebees. In other words, the wild bees did not appear to be going hungry, or gathering poorer food, because honey bees were foraging alongside them. For a research community that has grown increasingly concerned about the potential spillover of competition from managed bees onto wild species, the result is striking.

The grazing story was very different. Spring grazing by sheep removed almost two-thirds, 63 percent, of the vital spring nectar available to bumblebees compared with ungrazed sites. This matters because early spring is a bottleneck in the lives of bumblebee queens emerging from winter hibernation. They must find enough nectar and pollen to fuel the founding of new colonies, and the key resource at this time of year is not heather, which flowers later in the summer, but blaeberry, the delicate pink-bellied flowers of bilberry that carpet the moorland floor. When sheep crop the moor in spring, they strip away these flowers along with the grasses and shoots they were intended to eat, effectively removing the fuel station that wild bees depend on at the most vulnerable moment of their annual cycle.

Dr Maisie Brett, the study’s lead author, captured the surprise at the heart of the findings. We expected honey bees to be the main threat to wild bees and other heathland pollinators, she said, but it turns out how we manage these habitats may matter far more. Managing livestock with pollinators in mind could be more impactful than restricting beekeeping. The comment reframes a debate that has often focused narrowly on the ethics and ecology of migratory beekeeping, pointing instead toward the everyday decisions that shape what actually flowers on the moor and when.

The timing of the research gives it particular policy relevance. Scotland’s Wildlife Management and Muirburn Act, passed in 2024, now restricts heather burning, a practice long used to create fresh young shoots for grouse and grazing animals. At the same time, the current Scottish Pollinator Strategy does not currently address the potential impact of managed honey bees on wild pollinators. The new findings suggest that both frameworks may need to look more closely at livestock management, and that the conversation about protecting pollinators on moorland cannot be settled by regulating beekeepers alone. Dr Brett noted that the findings are particularly timely given these recent legislative and strategic developments.

The recommendations that flow from the study are pragmatic rather than punitive. The researchers suggest carefully managing or avoiding sheep grazing on heathland in spring, precisely when blaeberry and other early flowers are in bloom, so that emerging bumblebee queens can access the nectar they need. They also recommend that honey bee hives be introduced only during the peak heather flowering period, when the moor’s nectar supply is at its most abundant and competition pressure is likely to be lowest. Finally, they highlight the value of maintaining a patchwork of habitat types across the landscape, a mosaic that careful grazing can actually help to create, ensuring that different pollinator species find resources throughout the season rather than in a single concentrated burst.

That last point carries an important nuance. Grazing is not inherently harmful to moorland ecosystems; traditional low-intensity grazing has shaped these habitats for centuries and can prevent scrub encroachment while creating the structural variety that many invertebrates require. The problem identified by the Bristol team is one of timing and intensity. Sheep turned onto the moor in spring, when blaeberry is flowering, undo the seasonal nectar supply at its most critical point, whereas grazing patterns adjusted to the flowering calendar could retain the habitat benefits while sparing the pollinators. It is a reminder that in ecology, the question is often not whether a practice should happen, but when and how much.

The study was funded by UKRI and BBSRC and was carried out in collaboration with landowners and beekeepers across east Scotland, a partnership that reflects the practical realities of moorland management. Any change to grazing calendars or apiary siting will require cooperation among farmers, sporting estates, beekeeping associations and conservation bodies. What the research offers all of them is a clearer evidence base: on Scotland’s moorlands, the fate of wild pollinators appears to rest less with the hives that arrive in summer than with the sheep that graze in spring, and with the human choices that determine whether the moor blooms when the bees need it most.

Subject of Research: The impact of sheep grazing and managed honey bee hives on wild pollinator communities in Scottish heathland moorlands

Article Title: Sheep grazing may pose greater threat to Scotland’s wild pollinators than honey bees

Article References: Sheep grazing may pose greater threat to Scotland’s wild pollinators than honey bees. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: Scotland, heathland, bumblebees, honey bees, sheep grazing, pollinators, ling heather, muirburn, Journal of Applied Ecology, nectar availability, land management, blaeberry