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Population Ecology

, Volume 58, Issue 1, pp 121–133 | Cite as

Small-scale spatial and temporal variation in the demographic processes underlying the large-scale decline of eiders in the Baltic Sea

  • Markus ÖstEmail author
  • Satu Ramula
  • Andreas Lindén
  • Patrik Karell
  • Mikael Kilpi
Original article

Abstract

The application of uniform conservation schemes often fails to account for small-scale spatial variation in the drivers of population decline. Demographic comparisons of imperilled populations across locations are therefore crucial for successful conservation, but progress is hampered by lack of long-term data from more than a single population. The recent large-scale decline of eider ducks (Somateria mollissima) in the Baltic Sea is ideal for determining to what extent mechanisms underlying population decline can be extrapolated over larger areas. We utilized stochastic demographic methods incorporating both environmental and sampling variation to assess small-scale spatial and temporal variation in the population dynamics of eiders at Söderskär (eastern range-margin) and Tvärminne (core breeding area), situated 130 km apart. The stochastic growth rate models accurately predicted the observed differences in the rate of decline between sites and time periods. At Söderskär, established breeder survival had by far the greatest elasticity, whereas elasticity was more evenly distributed among vital rates at Tvärminne. Although the study sites showed the single largest difference in fecundity, stochastic life table response experiment analyses revealed that reduced adult female survival at Tvärminne mainly determined the observed difference in growth rates between sites. In contrast, reduced fecundity primarily differentiated the past population increase from the present population decline at Söderskär. Our results demonstrate that different mechanisms may be associated with population decline across adjacent geographic locations, and indicate that dispersal of first-time breeders may be important for population dynamics. Safeguarding adult female survival and/or fecundity should be prioritized in management efforts.

Keywords

Fecundity Population decline Population growth rate Predation Stochastic life table response experiment Survival 

Notes

Acknowledgments

We thank the numerous people participating in field work at both Söderskär and Tvärminne over the decades, particularly Martti Hario for his efforts in collecting the invaluable long-term data from Söderskär. We also thank Jukka Rintala and an anonymous reviewer for insightful comments on an earlier draft of this paper. This study was funded by the Academy of Finland (Grants 128039 to MÖ, 252577 to PK) and the Swedish Cultural Foundation in Finland (MÖ).

Compliance with ethical standards

Conflict of interest

None.

Supplementary material

10144_2015_517_MOESM1_ESM.pdf (30 kb)
Supplementary material 1 (PDF 29 kb)
10144_2015_517_MOESM2_ESM.pdf (55 kb)
Supplementary material 2 (PDF 55 kb)

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Copyright information

© The Society of Population Ecology and Springer Japan 2015

Authors and Affiliations

  1. 1.Environmental and Marine Biology, Faculty of Science and EngineeringÅbo Akademi UniversityTurkuFinland
  2. 2.Aronia Coastal Zone Research TeamÅbo Akademi University and Novia University of Applied SciencesEkenäsFinland

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