期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 288, 期 1957, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rspb.2021.1474
关键词
photoperiod; phenotypic plasticity; post-breeding movements; ontogenetic effect; assisted evolution
资金
- Canadian Foundation for Innovation
- Natural Sciences and Engineering Research Council's Discovery Grant Program
- University of Manitoba
- Research Manitoba
Previous laboratory studies have shown the role of photoperiod in small land bird migration timing, but this study investigates how manipulation of photoperiod during nestling development affects post-breeding movements in the wild. The research found that birds exposed to an extended photoperiod had a longer nesting period and later fledge and autumn departure dates. This study demonstrates the phenotypic plasticity of first-year birds in response to their hatch date and discusses the implications for altering migration timing with climate change through assisted evolution approaches.
Previous laboratory studies have demonstrated the role of photoperiod in cueing the migration timing of small land birds; however, how migration timing of young birds in wild environments develops in relation to these cues have rarely been investigated. Such investigations can make important contributions to our developing understanding of the phenotypic plasticity of migration timing to new conditions with climate change, where changes in the timing of nesting may expose juvenile birds to different photoperiods. We investigated the impact of manipulating photoperiod during nestling development in a long-distance migratory songbird on the timing of post-breeding movements in the wild. Using programmable lighting installed in the nest-boxes of purple martins (Progne subis), we exposed developing nestlings, from hatch to fledge date, to an extended photoperiod that matched the day length of the summer solstice in Manitoba, Canada. We found that birds with a simulated, earlier photoperiod had a longer nesting period and later fledge and autumn departure dates than control group birds. This study demonstrates the phenotypic plasticity of first-year birds to the ontogenetic effect of their hatch date in the formation of the timing of their first post-breeding movements. Further, we discuss how these results have implications for the potential use of assisted evolution approaches to alter migration timing to match new conditions with climate change.
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