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

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 breedin

SUBMITTER: Hallfors MH 

PROVIDER: S-EPMC7414193 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature