Aarhus Universitets segl

Cold comfort: Arctic seabirds find refugia from climate change and potential competition in marginal ice zones and fjords

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  • Anne-Sophie Bonnet-Lebrun, British Antarctic Survey
  • ,
  • Thomas Larsen, Max Planck Institute for the Science of Human History, Tyskland
  • Thorkell Lindberg Thórarinsson, Icelandic Institute for Natural History
  • ,
  • Yann Kolbeinsson, Northeast Iceland Nature Research Centre
  • ,
  • Morten Frederiksen
  • Tim I Morley, British Antarctic Survey
  • ,
  • Derren Fox, British Antarctic Survey
  • ,
  • Aude Boutet, British Antarctic Survey
  • ,
  • Fabrice le Bouard, British Antarctic Survey
  • ,
  • Tanguy Deville, British Antarctic Survey
  • ,
  • Erpur Snær Hansen, South Iceland Nature Research Centre
  • ,
  • Thomas Hansen, Helmholtz-Gemeinschaft Deutscher Forschungszentren
  • ,
  • Patrick Roberts, Max Planck Institute for the Science of Human History
  • ,
  • Norman Ratcliffe, British Antarctic Survey

Climate change alters species distributions by shifting their fundamental niche in space through time. Such effects may be exacerbated by increased inter-specific competition if climate alters species dominance where competitor ranges overlap. This study used census data, telemetry and stable isotopes to examine the population and foraging ecology of a pair of Arctic and temperate congeners across an extensive zone of sympatry in Iceland, where sea temperatures varied substantially. The abundance of Arctic Brunnich's guillemot Uria lomvia declined with sea temperature. Accessibility of refugia in cold water currents or fjords helped support higher numbers and reduce rates of population decline. Competition with temperate Common guillemots Uria aalge did not affect abundance, but similarities in foraging ecology were sufficient to cause competition when resources are limiting. Continued warming is likely to lead to further declines of Brunnich's guillemot, with implications for conservation status and ecosystem services.

Sider (fra-til)345-354
Antal sider10
StatusUdgivet - feb. 2022

Bibliografisk note

© 2021. The Author(s).

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