Foraging distributions of little auks Alle alle across the Greenland Sea: implications of present and future Arctic climate change

Marine Ecology Progress Series

S#322awomir Kwa#347niewski¹  Ann Harding¹  Ilona Goszczko¹  Josef Wiktor Jr¹  David Gr#xe9millet¹  Heli Routti¹  Laurel McFadden¹  Wojciech Walkusz¹  Allison Bailey¹  Zachary Brown¹  Gr#xe9gory Beaugrand¹  Nina Karnovsky¹ 

关键词: At-sea observations;    Calanus copepod;    Climate model;    East Greenland Current;    Seabird;    Little auk;    Sea temperature;    West Spitsbergen Current;   

DOI  :  10.3354/meps08749

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: The Arctic is undergoing widespread warming. In order to understand the impact of climate change on Arctic marine food webs, we studied the at-sea distribution of foraging little auks in contrasting conditions of the Greenland Sea. While the eastern side of the Greenland Sea has experienced recent warming, the western side is still dominated by cold, Arctic water in the East Greenland Current. We hypothesized that foraging little auks would be found in greatest abundance in cold Arctic waters bearing more lipid-rich prey, allowing them to deliver more energy-rich food to their chicks. To test our hypotheses, we made ship-borne bird observations and zooplankton tows, as well as analyses of chick meals at 2 little auk colonies adjacent to 3 distinct water masses in the Greenland Sea. Associated with the coldest water in the East Greenland Current, we found the highest concentrations of large Calanus copepods (C. glacialis and C. hyperboreus), as well as the highest concentrations of foraging little auks, indicating a relationship that is likely to be disrupted by increasing water temperatures. To assess potential future impacts of ocean warming, we used a coupled atmosphere–ocean global climate model (AOGCM) to predict Greenland Sea sea-surface temperatures over the study area at the end of the 21st century. Our results suggest that 4 of 8 little auk breeding colonies in the North Atlantic may be negatively impacted as temperatures exceed the thermal preferenda of large Calanus, which is the preferred prey of little auks during the breeding season.

【 授权许可】

Unknown