University of York Study Reveals: Black Death 'Rewilding' Did Not Boost Biodiversity

University of York's Groundbreaking Black Death Biodiversity Study

The University of York has once again positioned itself at the forefront of environmental research with a compelling new study challenging long-held assumptions about the Black Death's ecological legacy. Published in the prestigious journal Ecology Letters on March 4, 2026, the research reveals that the massive land abandonment following the 14th-century plague—often romanticized as a natural 'rewilding' event—actually led to a sharp decline in plant biodiversity across Europe for nearly 150 years.

Led by postdoctoral researcher Jonathan D. Gordon at the university's Leverhulme Centre for Anthropocene Biodiversity (LCAB), the study analyzed fossil pollen from 109 sites spanning the Common Era. This interdisciplinary effort highlights York's commitment to pioneering paleoecology and its applications to contemporary conservation challenges.

Historical Backdrop: The Black Death's Devastation

The Black Death, a bubonic plague pandemic between 1347 and 1353, decimated up to 50% of Europe's population, with some urban areas losing 80% of residents. Labor shortages triggered widespread abandonment of farmland, villages, and fields, allowing forests and scrub to reclaim vast landscapes. This unintentional 'rewilding'—forests expanding without human intervention—seemed like a boon for nature in retrospect. However, York's researchers demonstrate it was far from beneficial for plant diversity.

From 0 CE to 1300, plant diversity rose steadily alongside population growth and mixed agriculture, peaking in the High Middle Ages. The plague reversed this trend abruptly.

Unveiling the Methodology: Pollen Paleoecology at Work

Paleoecology, the study of ancient ecosystems through proxies like fossil pollen, forms the backbone of this research. York's team drew from the Neotoma Paleoecological Database, including European and Alpine Pollen Databases, examining 109 records.

• Sites covered diverse landscapes across Europe, capturing arable, pastoral, and forested areas.
• Pollen diversity metrics quantified shifts over millennia.
• Statistical models linked changes to human population dynamics and land use inferred from historical records.
• All data and code are openly available via Dryad, exemplifying York's open science ethos.

This rigorous approach underscores the value of archaeology and biology departments collaborating, a hallmark of York's research environment.

Shocking Findings: Decline Instead of Boom

Contrary to expectations, plant biodiversity plummeted post-plague. Forests regrew, but dominant trees and shrubs outcompeted herbs, grasses, and arable weeds, homogenizing landscapes. Recovery lagged until human repopulation resumed farming around 1500 CE, restoring mosaic habitats.

Areas with abandoned arable land suffered the steepest drops, while stable farming zones gained diversity. Over 2,000 years, humans drove Europe's biodiversity peaks through low-intensity mixed systems—farms interspersed with woods, hedges, and pastures.University of York press release

Professor Chris D. Thomas notes, "Biodiversity and human land use do not have to be in conflict. In many cases, they actually depend on one another."

Spotlight on Lead Researcher Jonathan D. Gordon

Jonathan D. Gordon, Postdoctoral Research Associate at LCAB, spearheaded the pollen analysis. His work explores human development's biodiversity impacts over 130,000 years. Gordon advocates a 'patchwork approach'—mosaics of crops, woodlands, and pastures—citing Iberian dehesas and Alpine pastures as models.

Gordon's career trajectory exemplifies postdoc opportunities in York's vibrant ecology scene. Aspiring researchers can find similar roles via higher ed research jobs.

Photo by Jason Dent on Unsplash

The Leverhulme Centre: Hub for Anthropocene Research

Funded by the Leverhulme Trust since 2019, LCAB unites York's Archaeology, Biology, and Mathematics departments with international partners like University College London. Director Lindsey Gillson integrates paleoecology, modeling, and stakeholder engagement.LCAB website

Projects span Biodiversification, Philias/Phobias (human attitudes to biodiversity), and Rewilding themes. With 20+ postdocs and PhDs, it trains Europe's next generation in sustainable human-nature relations.

Rewilding Debates: Lessons for European Conservation

York's findings critique pure rewilding, where human withdrawal is prioritized. Recent European studies echo this: Cambridge warns rewilding wealthy farmlands leaks harm to biodiversity hotspots elsewhere. Utrecht University's defaunation research stresses trophic reintroductions.

EU policies like the Nature Restoration Law balance rewilding with agri-mosaics, aligning with York's 'patchwork' vision.

European Universities Advancing Similar Research

York's work complements efforts elsewhere. Oxford's 2022 pollen study mapped Black Death land-use variability. Wageningen University explores rewilding governance. These collaborations highlight Europe's research ecosystem, with jobs in European university research positions.

• Wageningen: Rewilding social-ecological impacts.
• Cambridge: Global leakage from protected areas.
• St Andrews: Urban rewilding attitudes.

Implications for Environmental Science Programs

This study revitalizes paleoecology curricula across Europe. York's MSc in Biodiversity and Conservation equips students with pollen analysis and modeling skills. Similar programs at Edinburgh and Utrecht prepare graduates for policy roles.

Interested in paleoecology careers? York's LCAB offers PhD studentships blending archaeology and ecology.Craft a strong academic CV for such opportunities.

Future Directions and Actionable Insights

LCAB plans expanded modeling of future mosaics under climate change. Policymakers should prioritize low-intensity farming subsidies, as in EU's Common Agricultural Policy reforms.

1. Promote hedgerow restoration.
2. Support mixed grazing systems.
3. Integrate paleo data into restoration plans.

Stakeholders from farmers to NGOs can collaborate for balanced landscapes.

Photo by Mojahid Mottakin on Unsplash

Charting Careers in Biodiversity Research

York's study showcases postdoc paths like Gordon's. European universities seek experts in Anthropocene ecology amid biodiversity crises. Explore higher ed jobs, Europe university jobs, and rate your professors for insights. For advice, visit higher ed career advice.

This research not only reframes history but equips future scientists to harmonize humanity and nature.