According to a study published in the Proceedings of the National Academy of Sciences, evolutionary adaptation alone is unlikely to prevent black-browed albatross population declines under projected climate change, though substantially limiting greenhouse gas emissions reduces projected extinction probability by approximately half. Researchers from the Woods Hole Oceanographic Institution, the Université du Québec à Rimouski, and the National Center for Atmospheric Research examined more than three decades of demographic and phenotypic data from the Southern Ocean seabird to determine if evolutionary rescue could outpace environmental deterioration.
Can Albatross Evolution Keep Pace With Global Warming?
Natural selection can help populations cope with environmental shifts, but long-lived species face distinct temporal constraints. According to WHOI senior scientist Stéphanie Jenouvrier, environmental conditions can deteriorate and populations can decline before evolutionary responses have time to substantially impact population trajectories. Co-author Joanie Van de Walle noted that while certain traits like wing length help young birds survive, the key question remains whether genetic changes can happen fast enough to match the speed of modern climate change.
Eco-Evolutionary Modeling of Southern Ocean Seabirds
Researchers built a computer model combining albatross demography, trait inheritance, and future climate projections to track how individual differences in physical traits, behavior, and breeding timing affect survival. Under historical, stable climate conditions, evolution led to larger projected populations. However, under future warming scenarios, evolutionary changes generally failed to prevent population drops. Furthermore, passing traits from parents to offspring did little to reduce extinction risk, proving that adaptation relies heavily on strong natural selection and slower rates of climate change, according to the study’s findings.
Mitigation Versus Adaptation in Long-Lived Species
The rate and magnitude of future warming directly dictate whether adaptation can succeed. According to NCAR scientist and co-author Marika Holland, reducing greenhouse gas emissions slows population decline, giving evolutionary adaptation the necessary time to promote persistence. Jenouvrier emphasized that evolutionary rescue depends heavily on where selection acts across the life cycle, noting that limiting emissions gives adaptation a much greater chance to contribute to population survival than relying on evolution alone.
Did You Know?
Black-browed albatrosses are pelagic seabirds, meaning they spend the vast majority of their lives gliding far out at sea across the Southern Ocean and surrounding waters.
Frequently Asked Questions
What is evolutionary rescue?
Evolutionary rescue occurs when adaptive evolutionary change allows a biological population to avoid extinction following environmental deterioration.
Why can’t black-browed albatrosses evolve quickly enough?
Because albatrosses are long-lived species with long generation times, environmental conditions can deteriorate and populations can decline before evolutionary responses have time to take effect, according to the PNAS study.
How much does climate mitigation help seabird survival?
Substantially limiting greenhouse gas emissions improves the species’ chances of survival by reducing projected extinction probability by approximately half, according to researchers.
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