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

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Hällfors , M , Antao , L , Itter , M , Lehikoinen , A , Lindholm , T M , Roslin , T & Saastamoinen , M 2020 , ' Shifts in timing and duration of breeding for 73 boreal bird species over four decades ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 117 , no. 31 , pp. 18557-18565 . https://doi.org/10.1073/pnas.1913579117

Title: Shifts in timing and duration of breeding for 73 boreal bird species over four decades
Author: Hällfors, Maria; Antao, Laura; Itter, Malcolm; Lehikoinen, Aleksi; Lindholm, Tanja Marjukka; Roslin, Tomas; Saastamoinen, Marjo
Contributor organization: Organismal and Evolutionary Biology Research Programme
Research Centre for Ecological Change
Life-history Evolution Research Group
Helsinki Institute of Sustainability Science (HELSUS)
Zoology
Finnish Museum of Natural History
Helsinki University Library
Department of Agricultural Sciences
Spatial Foodweb Ecology Group
Helsinki Institute of Life Science HiLIFE
Plant Adaptation and Conservation
Date: 2020-08-04
Language: eng
Number of pages: 9
Belongs to series: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
DOI: https://doi.org/10.1073/pnas.1913579117
URI: http://hdl.handle.net/10138/320545
Abstract: Breeding 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 to 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.
Subject: 1172 Environmental sciences
1181 Ecology, evolutionary biology
Ayes
global change
life history strategies
reproduction
phenology
CLIMATE-CHANGE
PHENOLOGICAL RESPONSE
DENSITY SHIFTS
MIGRATION
EVOLUTIONARY
PLASTICITY
MISMATCH
INCREASE
IMPACTS
ECOLOGY
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: publishedVersion


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