A1 Refereed original research article in a scientific journal

Female breeding dispersal to higher quality habitats in a philopatric top predator




AuthorsOtterbeck Andreas, Lindén Andreas, Gunko Ruslan, Ylinen Eeva, Byholm Patrik

PublisherSPRINGER HEIDELBERG

Publication year2022

JournalJournal of Ornithology

Journal name in sourceJOURNAL OF ORNITHOLOGY

Journal acronymJ ORNITHOL

Volume163

Issue1

First page 83

Last page92

Number of pages10

ISSN2193-7192

eISSN2193-7206

DOIhttps://doi.org/10.1007/s10336-021-01943-4

Web address https://link.springer.com/article/10.1007%2Fs10336-021-01943-4

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/68217487


Abstract

Philopatry and monogamy are conventionally viewed as strategies for improving fitness. Many philopatric and monogamous species have, however, been shown to perform breeding dispersal-an exchange of territory (and often also partner) between two breeding seasons. The adaptiveness of breeding dispersal remains controversial, as data remain scarce and sporadic. For the Northern Goshawk, a typically highly philopatric and monogamous forest raptor, pairs breeding in barren forest landscapes produce fewer fledglings than pairs breeding in more productive landscapes. Using data on Finnish breeding female Goshawks (Accipiter gentilis) during 1999-2016, we tested the hypotheses that: (1) breeding dispersal is more likely at barren territories, (2) dispersing females move to less barren territories, and (3) breeding dispersal improves the survival of young. About 29% of the female Goshawks in our study performed breeding dispersal, which contrasts to philopatry and suggest that site and partner fidelities show large variation within the species' breeding range. We found no evidence that territorial landscape barrenness (proxy on habitat quality) affects the probability of breeding dispersal. However, females that dispersed upgraded to less barren territories. Nevertheless, there were no subsequent effects of breeding dispersal on reproductive performance, suggesting no obvious difference in the capability of rearing young at either site. Although dispersal events were directed to less barren habitats, we suggest that female dispersal is not driven by the pursue for more prospersous habitats, rather that those females are forced to move, for whatever reason. In addition to other observed reasons such as female-female competition for mates and loss of the original mate, intense logging of mature forests lowering local food availability and restricting nest site availability were likely a partial cause of increased breeding dispersal.


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Last updated on 2024-26-11 at 14:24