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Marine Ecology Progress Series

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MEPS 679:163-179 (2021)  -  DOI:

Northwest range shifts and shorter wintering period of an Arctic seabird in response to four decades of changing ocean climate

Allison Patterson1,*, H. Grant Gilchrist2, Anthony Gaston3, Kyle H. Elliott1

1Department of Natural Resource Sciences, McGill University, Ste Anne-de-Bellevue, Quebec H9X 3V9, Canada
2National Wildlife Research Centre, Wildlife Research Division, Environment & Climate Change Canada, Ottawa K1S 5B6, Canada
3Laskeek Bay Conservation Society, Queen Charlotte, British Columbia V0T 1S1, Canada
*Corresponding author:

ABSTRACT: Climate change is altering the marine environment at a global scale, with some of the most dramatic changes occurring in Arctic regions. These changes may affect the distribution and migration patterns of marine species throughout the annual cycle. Species distribution models have provided detailed understanding of the responses of terrestrial species to climate changes, often based on observational data; biologging offers the opportunity to extend those models to migratory marine species that occur in marine environments where direct observation is difficult. We used species distribution modelling and tracking data to model past changes in the non-breeding distribution of thick-billed murres Uria lomvia from a colony in Hudson Bay, Canada, between 1982 and 2019. The predicted distribution of murres shifted during fall and winter. The largest shifts have occurred for fall migration, with range shifts of 211 km west and 50 km north per decade, compared with a 29 km shift west per decade in winter. Regions of range expansions had larger declines in sea ice cover, smaller increases in sea surface temperature, and larger increases in air temperature than regions where the range was stable or declining. Murres migrate in and out of Hudson Bay as ice forms each fall and melts each spring. Habitat in Hudson Bay has become available later into the fall and earlier in the spring, such that habitat in Hudson Bay was available for 21 d longer in 2019 than in 1982. Clearly, marine climate is altering the distribution and annual cycle of migratory marine species that occur in areas with seasonal ice cover.

KEY WORDS: Thick-billed murre · Uria lomvia · Hudson Bay · Species distribution model · Migration · Phenology · Non-breeding distribution

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Cite this article as: Patterson A, Gilchrist HG, Gaston A, Elliott KH (2021) Northwest range shifts and shorter wintering period of an Arctic seabird in response to four decades of changing ocean climate. Mar Ecol Prog Ser 679:163-179.

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