Abstract
In the high-arctic archipelago of Svalbard, the pink-footed goose (Anser brachyrhynchus) population has increased dramatically over the last decades. The population increase and the corresponding range expansion suggest a substantial increase in the potential for disturbance of the tundra caused by goose herbivory. In this study, we used surveys of pink-footed goose grubbing from two separate years (2007 and 2012) to examine the temporal changes in the prevalence of grubbing in central Spitsbergen. During this time period, the Svalbard-breeding pink-footed goose population had increased from 56,400 to 80,000 individuals. We compared grubbing prevalence between the 2 years, standardising the comparison by using a published model of habitat suitability for grubbing (Speed et al. in Ecosystems 12:349-359, 2009) as a covariate. Habitat suitability was a significant predictor of grubbing prevalence across both years, with higher grubbing probability in habitats predicted to be more suitable for grubbing. The probability of grubbing was on average 4 times higher in 2012 than in 2007. In 2007, all tundra habitats had a probability of <27 % of being grubbed whilst in 2012, there was a probability for being grubbed of more than 34 % in the least suitable habitat and around 59 % in the most suitable habitat. The increase in grubbing prevalence demonstrates a great need for monitoring the expanding pink-footed goose population and its impact on the tundra landscape.
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Acknowledgments
Funding was provided by FRAM—High North Research Centre for Climate and the Environment (Fram Centre), the Norwegian Institute for Nature Research, the Norwegian Polar Institute, the University Centre in Svalbard and the UK Natural Environment Research Council (NER/S/A/2005/13880). We thank Pernille B. Eidesen, Eva Fuglei, Jane Jepsen, Jesper Madsen and Audun Stien for valuable discussions of study design and data sampling and Oddveig Øien Ørvoll and Bernt Bye for graphical assistance. Constructive comments from Jouke Prop, Sofie Sjögersten and an anonymous reviewer substantially improved the paper.
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Pedersen, Å.Ø., Speed, J.D.M. & Tombre, I.M. Prevalence of pink-footed goose grubbing in the arctic tundra increases with population expansion. Polar Biol 36, 1569–1575 (2013). https://doi.org/10.1007/s00300-013-1374-9
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DOI: https://doi.org/10.1007/s00300-013-1374-9