A gloomy future for light-bellied brent geese in Tusenøyane, Svalbard, under a changing predator regime

  • Jesper Madsen Department of Bioscience, Aarhus University https://orcid.org/0000-0003-3246-0215
  • Cornelia Jaspers DTU Aqua, Danish Technical University https://orcid.org/0000-0003-2850-4131
  • John Frikke Wadden Sea National Park Secretariat
  • Ove M. Gundersen Norwegian Farmers’ Association
  • Bart A. Nolet Department of Animal Ecology, Netherlands Institute of Ecology; Department of Theoretical and Computational Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam https://orcid.org/0000-0002-7437-4879
  • Koen Nolet Department of Animal Ecology, Netherlands Institute of Ecology
  • Kees H.T. Schreven Department of Animal Ecology, Netherlands Institute of Ecology
  • Christian Sonne Department of Bioscience, Aarhus University https://orcid.org/0000-0001-5723-5263
  • Peter de Vries Department of Animal Ecology, Netherlands Institute of Ecology
Keywords: Branta bernicla hrota, Cochlearia officinalis, great skua, polar bear, predation

Abstract

The endangered population of light-bellied brent geese (Branta bernicla hrota) breeding in Svalbard and north-east Greenland used to have its core breeding area in the archipelago of Tusenøyane in south-east Svalbard. Studies carried out during 1987–1991 showed that the Tusenøyane population was subject to heavy egg predation by polar bears and, in one year, Arctic foxes. Revisiting some key nesting islands in August 2018, we found few nests used by brent geese and no families. The high density of common scurvygrass (Cochlearia officinalis), a food favoured by brent geese and therefore formerly depleted by them, indicates that the geese have been absent for some time. Among other bird species, such as barnacle goose and common eider, very few young were observed as well. As potential predators, polar bears, or signs of their recent presence, were observed on most islands, and great skuas occurred on almost all islands, with 60 individuals on Lurøya, formerly an important island for geese. In contrast, only a single pair of great skuas was observed 30 years ago. The observations suggest that recent expansion of great skuas in the North Atlantic, including Svalbard, has led to a novel extreme predation pressure, additional to that caused by mammalian predators. Despite the loss of Tusenøyane as a breeding ground, the population of brent geese has increased in recent decades; so we can infer that the population now recruits from remote but mainly unknown breeding grounds.

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Published
2019-06-27
How to Cite
Madsen, J., Jaspers, C., Frikke, J., Gundersen, O., Nolet, B., Nolet, K., Schreven, K., Sonne, C., & de Vries, P. (2019). A gloomy future for light-bellied brent geese in Tusenøyane, Svalbard, under a changing predator regime. Polar Research, 38. https://doi.org/10.33265/polar.v38.3393
Section
Research Notes

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