Data from: Shifts in timing and duration of breeding for 73 boreal bird species over four decades

dc.contributor.affiliationUniversity of Helsinki - Hällfors, Maria
dc.contributor.affiliationUniversity of Helsinki - Antão, Laura
dc.contributor.affiliationUniversity of Massachusetts Amherst - Itter, Malcolm
dc.contributor.affiliationUniversity of Helsinki - Lehikoinen, Aleksi
dc.contributor.affiliationUniversity of Helsinki - Lindholm, Tanja
dc.contributor.affiliationUniversity of Helsinki - Roslin, Tomas
dc.contributor.affiliationUniversity of Helsinki - Saastamoinen, Marjo
dc.contributor.authorHällfors, Maria
dc.contributor.authorAntão, Laura
dc.contributor.authorItter, Malcolm
dc.contributor.authorLehikoinen, Aleksi
dc.contributor.authorLindholm, Tanja
dc.contributor.authorRoslin, Tomas
dc.contributor.authorSaastamoinen, Marjo
dc.date.accessioned2025-03-24T15:11:13Z
dc.date.issued2020-08-24
dc.date.issued2020-08-24
dc.descriptionBreeding timed to match optimal resource abundance is vital for the successful reproduction of species, and breeding is therefore sensitive to environmental cues. As the timing of breeding shifts with a changing climate, this may not only affect the onset of breeding, but also its termination, and thus the length of the breeding period. We use an extensive dataset of over 820K nesting records of 73 bird species across the boreal region in Finland to probe for changes in the beginning, end, and duration of the breeding period over four decades (1975-2017). We uncover a general advance of breeding with a strong phylogenetic signal, but no systematic variation over space. Additionally, 31% of species contracted their breeding period in at least one bioclimatic zone, as the end of the breeding period advanced more than the beginning. We did not detect a statistical difference in phenological responses of species with combinations of different migratory strategy or number of broods. Nonetheless, we find systematic differences in species responses, as the contraction in the breeding period was found almost exclusively in resident and short-distance migrating species, which generally breed early in the season. Overall, changes in the timing and duration of reproduction may potentially lead to more broods co-occurring in the early breeding season – a critical time for species' reproductive success. Our findings highlight the importance of quantifying phenological change across species and over the entire season, to reveal shifts in the community-level distribution of bird reproduction.
dc.identifierhttps://doi.org/10.5061/dryad.wstqjq2ht
dc.identifier.urihttps://hydatakatalogi-test-24.it.helsinki.fi/handle/123456789/9023
dc.rightsOpen
dc.rights.licensecc-zero
dc.subjectringing
dc.subjectbanding
dc.subjectnestling
dc.subjectchick
dc.subjectBoreal
dc.titleData from: Shifts in timing and duration of breeding for 73 boreal bird species over four decades
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