Evolutionary Changes in Apennine Brown Bears Due to Human Interaction

A recent study published in *Molecular Biology and Evolution* reveals that the Apennine brown bear, a small and isolated population in central Italy, has undergone significant evolutionary changes due to close interactions with humans. This population diverged from other European brown bears approximately 2,000 to 3,000 years ago, primarily due to human activities such as forest clearance and agricultural expansion. The study highlights how these interactions have led to distinct phenotypic differences, including smaller body sizes and reduced aggression compared to other brown bear populations.

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The research, led by Andrea Benazzo, indicates that Apennine brown bears exhibit unique physical traits and behavioral adaptations that have emerged from their long-standing proximity to human settlements. The study utilized high-quality chromosome-level reference genomes to analyze the genetic diversity of these bears, revealing reduced genomic diversity and higher inbreeding rates. Notably, the bears possess genetic signatures linked to reduced aggressiveness, suggesting that human-induced selection has played a role in shaping their behavior. Giulia Fabbri, another author of the study, emphasized that these adaptations have facilitated coexistence with humans, despite increasing extinction risks due to genomic erosion.

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While the evolutionary changes in Apennine brown bears may promote coexistence, they also highlight the complexities of human-wildlife interactions. In northern Italy, authorities face challenges from animal rights activists regarding the management of the growing Alpine brown bear population, which has rebounded due to conservation initiatives funded by the European Union. This resurgence has led to increased encounters between bears and humans, sometimes resulting in tragic incidents. For instance, in 2023, a 17-year-old female bear named JJ4 killed a runner, following previous attacks on a father and son in 2020.

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Critics argue that while conservation efforts have successfully increased bear populations, they have also raised concerns about public safety and the livelihoods of rural residents. Farmers and local communities in both northern Italy and northwestern Greece report heightened fears regarding bear encounters, exacerbated by the animals' return following hunting bans. Giorgio Bertorelle, a researcher involved in the study, cautioned against diluting genetic variants in these populations through restocking efforts, suggesting that even negatively impacted populations may harbor valuable genetic traits.

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The findings of this study underscore the need for a nuanced approach to wildlife conservation that considers both the ecological and social dimensions of human-wildlife interactions. As bear populations rebound in Europe, balancing conservation goals with community safety and economic stability will be essential for the long-term coexistence of humans and wildlife.

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• “Human-wildlife interactions are often dangerous for the survival of a species, but may also favour the evolution of traits that reduce conflict," said Giorgio Bertorelle, another researcher involved in the study.” — Giorgio Bertorelle, Researcher

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• “More interestingly, however, we showed that Apennine brown bears also possess selective signatures at genes associated with reduced aggressiveness,” — Giulia Fabbri, Researcher

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