Climate-driven carry-over effects negatively influence population growth rate in a food-caching boreal passerine.

Autor: Sutton AO; Department of Integrative Biology, University of Guelph, Guelph, ON, Canada., Strickland D; 1063 Oxtongue Lake Road, Dwight, ON, Canada., Freeman NE; Department of Integrative Biology, University of Guelph, Guelph, ON, Canada., Norris DR; Department of Integrative Biology, University of Guelph, Guelph, ON, Canada.; Nature Conservancy of Canada, Toronto, ON, Canada.
Jazyk: angličtina
Zdroj: Global change biology [Glob Chang Biol] 2020 Dec 21. Date of Electronic Publication: 2020 Dec 21.
DOI: 10.1111/gcb.15445
Abstrakt: Understanding how events throughout the annual cycle are linked is important for predicting variation in individual fitness, but whether and how carry-over effects scale up to influence population dynamics is poorly understood. Using 38 years of demographic data from Algonquin Provincial Park, Ontario, and a full annual cycle integrated population model, we examined the influence of environmental conditions and density on the population growth rate of Canada jays (Perisoreus canadensis), a resident boreal passerine that relies on perishable cached food for over-winter survival and late-winter breeding. Our results demonstrate that fall environmental variables, most notably the number of freeze-thaw events, carried over to influence late-winter fecundity, which, in turn, was the main vital rate driving population growth. These results are consistent with the hypothesis that warmer and more variable fall conditions accelerate the degradation of perishable stored food that is relied upon for successful reproduction. Future warming during the fall and winter may compromise the viability of cached food that requires consistent subzero temperatures for effective preservation, potentially exacerbating climate-driven carry-over effects that impact long-term population dynamics.
(© 2020 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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