The Longevity Paradox: How Lifespan Shapes a Population’s Survival
A new theoretical study in *The American Naturalist* investigates the complex role longevity plays in evolutionary rescue—the process by which a population adapts to avoid extinction from rapid environmental change. The research finds that while longer-lived organisms have slower population growth, which can hinder their numerical recovery from a population bottleneck, it does not necessarily slow their rate of genetic adaptation. This challenges the assumption that short generation times are always advantageous for rapid evolution, highlighting a critical trade-off between demographic and evolutionary processes under selective pressure.
Why it might matter to you: For professionals focused on evolutionary biology, this work refines models of population genetics and speciation, particularly for understanding how life-history traits like longevity influence adaptive radiation and responses to modern selective pressures. It provides a crucial framework for predicting which species or populations are most vulnerable to extinction from climate change or habitat fragmentation, moving beyond simple generation-time rules to a more nuanced view of evolutionary potential.
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