Increasing environmental variability inhibits evolutionary rescue in a long- lived vertebrate

• 成果类型: Article
• 署名作者: Clark-Wolf, T. J.; Boersma, P. Dee; Plard, Floriane; Rebstock, Ginger A.; Abrahms, Briana
• 署名单位: University of Washington; University of Washington Seattle; Utah System of Higher Education; Utah State University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-11840
• DOI: 10.1073/pnas.2406314121
• 发表日期: 2024-08-20
• 关键词: spheniscus-magellanicus; contemporary evolution; fluctuating selection; reproductive success; phenotypic selection; natural-selection; CLIMATE-CHANGE; CONSERVATION; penguins; DYNAMICS

摘要

Evolutionary rescue, whereby adaptive evolutionary change rescues populations from extinction, is theorized to enable imperiled animal populations to persist under increasing anthropogenic change. Despite a large body of evidence in theoretical and laboratory settings, the potential for evolutionary rescue to be a viable adaptation process for free- ranging animals remains unknown. Here, we leverage a 38- year dataset following the fates of 53,959 Magellanic penguins ( Spheniscus magellanicus) to investigate whether a free- ranging vertebrate species can morphologically adapt to long- term environmental change sufficiently to promote population persistence. Despite strong selective pressures, we found that penguins did not adapt morphologically to long- term environmental changes, leading to projected population extirpation. Fluctuating selection benefited larger penguins in some environmental contexts, and smaller penguins in others, ultimately mitigating their ability to adapt under increasing environmental variability.Under future climate projections, we found that the species cannot be rescued by adaptation, suggesting similar constraints for other long- lived species. Such results reveal how fluctuating selection driven by environmental variability can inhibit adaptation under long- term environmental change. Our eco- evolutionary approach helps explain the lack of adaptation and evolutionary rescue in response to environmental change observed in many animal species.