Reduced hybrid survival in a migratory divide between songbirds

Author:

Blain Stephanie A.1ORCID,Justen Hannah C.1ORCID,Easton Wendy2,Delmore Kira E.1

Affiliation:

1. Department of Biology Texas A&M University College Station Texas USA

2. Canadian Wildlife Service Environment and Climate Change Canada Delta British Columbia Canada

Abstract

AbstractMigratory divides, hybrid zones between populations that use different seasonal migration routes, are hypothesised to contribute to speciation. Specifically, relative to parental species, hybrids at divides are predicted to exhibit (1) intermediate migratory behaviour and (2) reduced fitness as a result. We provide the first direct test of the second prediction here with one of the largest existing avian tracking datasets, leveraging a divide between Swainson's thrushes where the first prediction is supported. Using detection rates as a proxy for survival, our results supported the migratory divide hypothesis with lower survival rates for hybrids than parental forms. This finding was juvenile‐specific (vs. adults), suggesting selection against hybrids is stronger earlier in life. Reduced hybrid survival was not explained by selection against intermediate phenotypes or negative interactions among phenotypes. Additional work connecting specific features of migration is needed, but these patterns provide strong support for migration as an ecological driver of speciation.

Funder

National Science Foundation

Publisher

Wiley

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Endurance athletes hiding in plain sight in the high Andes;Proceedings of the National Academy of Sciences;2024-05-23

2. Genotype imputation in F2 crosses of inbred lines;Bioinformatics Advances;2024

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