期刊
ECOLOGY LETTERS
卷 23, 期 3, 页码 430-438出版社
WILEY
DOI: 10.1111/ele.13436
关键词
Competition; cooperation; dispersal; fitness; inbreeding; kin selection; local resource enhancement; philopatry; sex-biased dispersal; Tamiasciurus hudsonicus
类别
资金
- Natural Sciences and Engineering Council of Canada
- Northern Scientific Training Program
- National Science Foundation
Dispersal is nearly universal; yet, which sex tends to disperse more and their success thereafter depends on the fitness consequences of dispersal. We asked if lifetime fitness differed between residents and immigrants (successful between-population dispersers) and their offspring using 29 years of monitoring from North American red squirrels (Tamiasciurus hudsonicus) in Canada. Compared to residents, immigrant females had 23% lower lifetime breeding success (LBS), while immigrant males had 29% higher LBS. Male immigration and female residency were favoured. Offspring born to immigrants had 15-43% lower LBS than offspring born to residents. We conclude that immigration benefitted males, but not females, which appeared to be making the best of a bad lot. Our results are in line with male-biased dispersal being driven by local mate competition and local resource enhancement, while the intergenerational cost to immigration is a new complication in explaining the drivers of sex-biased dispersal.
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