What is it about?

We studied some of the oldest oak trees in the Mediterranean using radiocarbon dating. We found that many of these trees began growing shortly after the Black Death pandemic of the 14th century, when human populations declined and pressure on forests was greatly reduced. Our results show that some Mediterranean oaks can live for nearly 1,000 years and that ancient trees preserve evidence of how forests recovered naturally after major human collapse.

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Why is it important?

This study links the age structure of living trees to one of the most transformative events in human history - the Black Death - revealing a demographic signature that remains visible in Mediterranean forests nearly 700 years later. By showing how ecosystems responded to a large-scale reduction in human pressure in the past, our results provide a long-term perspective on nature recovery and highlight the value of ancient trees as living witnesses of environmental change, biodiversity resilience, and landscape history.

Perspectives

What I find most remarkable about this study is that it shows how much history can be preserved in living organisms. These ancient oaks are not only among the oldest trees in the Mediterranean: they are living witnesses that have survived centuries of environmental and social change. I was particularly fascinated that a demographic event occurred nearly 700 years ago can still be detected in the age structure of present-day tree populations. For me, this highlights the unique value of ancient trees as archives of the past and reminds us that the effects of human actions on ecosystems can persist for centuries.

Jordan Palli
Department of Ecological and Biological Sciences (DEB), University of Tuscia

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This page is a summary of: Ancient oaks reveal rewilding of Mediterranean forests after the Black Death, Proceedings of the National Academy of Sciences, June 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2529341123.
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