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Philopatric predisposition to predation-induced ecological traps: habitat-dependent mortality of breeding eiders

Ekroos, Johan; Ost, Markus; Karell, Patrik LU ; Jaatinen, Kim and Kilpi, Mikael (2012) In Oecologia 170(4). p.979-986
Abstract
Because population size is sensitive to changes in adult survival, adult survival may be buffered against environmental variability. Philopatry may be adaptive in changing environments, but it could also constrain breeding habitat selection under changing conditions such as shifting predation regimes. Habitat preference and quality could become decoupled in long-lived philopatric species that evolved in stable environments when suddenly faced by increased adult predation risk, as dispersal may be triggered by past reproductive failure. We evaluated whether the Baltic eider (Somateria m. mollissima) population may currently face a predation-induced ecological trap. Eiders are philopatric and nest on open and forested islands. We... (More)
Because population size is sensitive to changes in adult survival, adult survival may be buffered against environmental variability. Philopatry may be adaptive in changing environments, but it could also constrain breeding habitat selection under changing conditions such as shifting predation regimes. Habitat preference and quality could become decoupled in long-lived philopatric species that evolved in stable environments when suddenly faced by increased adult predation risk, as dispersal may be triggered by past reproductive failure. We evaluated whether the Baltic eider (Somateria m. mollissima) population may currently face a predation-induced ecological trap. Eiders are philopatric and nest on open and forested islands. We hypothesized that open-nesting females would be disproportionately affected by increased predation. We compared female annual survival in these two habitats in 1996-2010. We also tested for effects of time trends, winter severity (NAO), female body condition, and habitat-specific predation pressure on survival. Our results revealed the lowest survival recorded for this species (I broken vertical bar = 0.720), and survival on open islands was significantly lower (I broken vertical bar = 0.679) than on forested islands (I broken vertical bar = 0.761). Nonetheless, only 0.7 % of females changed breeding habitat type despite ample availability of alternative islands, and breeding phenology in both habitats was similar. Female survival increased with body condition, while it was unrelated to winter climate and stable over time. Open islands had a higher predation pressure on incubating females. Breeding philopatry results in a predator-mediated ecological trap for open-nesting eiders. Our results contribute to explaining the drastic decline of the Baltic eider population. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Body condition, Habitat selection, Predation risk, Site fidelity, Survival analysis
in
Oecologia
volume
170
issue
4
pages
979 - 986
publisher
Springer
external identifiers
  • wos:000310999400010
  • scopus:84866940143
ISSN
1432-1939
DOI
10.1007/s00442-012-2378-9
language
English
LU publication?
yes
id
b3085e9a-de98-4b04-8a2b-0dcb6822b0e4 (old id 3243110)
date added to LUP
2012-12-28 10:25:42
date last changed
2017-09-24 04:00:49
@article{b3085e9a-de98-4b04-8a2b-0dcb6822b0e4,
  abstract     = {Because population size is sensitive to changes in adult survival, adult survival may be buffered against environmental variability. Philopatry may be adaptive in changing environments, but it could also constrain breeding habitat selection under changing conditions such as shifting predation regimes. Habitat preference and quality could become decoupled in long-lived philopatric species that evolved in stable environments when suddenly faced by increased adult predation risk, as dispersal may be triggered by past reproductive failure. We evaluated whether the Baltic eider (Somateria m. mollissima) population may currently face a predation-induced ecological trap. Eiders are philopatric and nest on open and forested islands. We hypothesized that open-nesting females would be disproportionately affected by increased predation. We compared female annual survival in these two habitats in 1996-2010. We also tested for effects of time trends, winter severity (NAO), female body condition, and habitat-specific predation pressure on survival. Our results revealed the lowest survival recorded for this species (I broken vertical bar = 0.720), and survival on open islands was significantly lower (I broken vertical bar = 0.679) than on forested islands (I broken vertical bar = 0.761). Nonetheless, only 0.7 % of females changed breeding habitat type despite ample availability of alternative islands, and breeding phenology in both habitats was similar. Female survival increased with body condition, while it was unrelated to winter climate and stable over time. Open islands had a higher predation pressure on incubating females. Breeding philopatry results in a predator-mediated ecological trap for open-nesting eiders. Our results contribute to explaining the drastic decline of the Baltic eider population.},
  author       = {Ekroos, Johan and Ost, Markus and Karell, Patrik and Jaatinen, Kim and Kilpi, Mikael},
  issn         = {1432-1939},
  keyword      = {Body condition,Habitat selection,Predation risk,Site fidelity,Survival analysis},
  language     = {eng},
  number       = {4},
  pages        = {979--986},
  publisher    = {Springer},
  series       = {Oecologia},
  title        = {Philopatric predisposition to predation-induced ecological traps: habitat-dependent mortality of breeding eiders},
  url          = {http://dx.doi.org/10.1007/s00442-012-2378-9},
  volume       = {170},
  year         = {2012},
}