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| DOI | 10.3354/meps14440 |
| Comparison of feeding niches between Arctic and northward-moving sub-Arctic marine mammals in Greenland | |
| 发表日期 | 2024 |
| ISSN | 0171-8630 |
| EISSN | 1616-1599 |
| 起始页码 | 728 |
| 卷号 | 728 |
| 英文摘要 | The climate change-induced northward movement of sub-Arctic marine mammals increases their range overlap and interactions with native Arctic species. We compared feeding patterns of 11 marine mammal species (4 Arctic and 7 sub-Arctic) in Greenland using stable isotope ratios and fatty acid signatures, and also assessed the effects of lipid extraction on stable isotope ratios. Lipid extraction showed limited increases in delta 13C, intermediate effects on delta 15N, and significant depletion of delta 34S in muscle of some marine mammals. Arctic and sub-Arctic species differed in stable isotope ratios, indicating some use of separate food resources, while likely also reflecting baseline isotopic variation. Proportions of some of the most abundant fatty acids (20:1n9, 22:1n11, 20:5n3, 22:6n3) varied between Arctic and sub-Arctic species, indicating that sub-Arctic species rely mostly on a pelagic food web, while Arctic species exploit an ice-associated and benthic food web, although the sub-Arctic harp and hooded seals and Arctic narwhal showed opposite patterns. Sub-Arctic species had the largest niche breadths, implying diet flexibility and potential to adapt to further changes. Overall patterns in dietary tracers demonstrate separation of feeding niches between most Arctic and sub-Arctic marine mammals, but potential niche overlap and shared food resources for some species. Sub-Arctic seal species overlap the feeding niches of native Arctic species the most of all range-shifters, and of Arctic species, narwhal appear to be the most vulnerable to niche overlap and potential food competition with northward-shifting species. |
| 英文关键词 | Foraging; Niche breadth; Whale; Seal; Lipid extraction; 13C; 15N; 34S; Stable isotopes; Fatty acids |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Oceanography |
| WOS类目 | Ecology ; Marine & Freshwater Biology ; Oceanography |
| WOS记录号 | WOS:001186659000006 |
| 来源期刊 | MARINE ECOLOGY PROGRESS SERIES
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/289681 |
| 作者单位 | McGill University; Greenland Institute of Natural Resources; Swedish Museum of Natural History; Aarhus University; Laval University; Greenland Institute of Natural Resources |
| 推荐引用方式 GB/T 7714 | . Comparison of feeding niches between Arctic and northward-moving sub-Arctic marine mammals in Greenland[J],2024,728. |
| APA | (2024).Comparison of feeding niches between Arctic and northward-moving sub-Arctic marine mammals in Greenland.MARINE ECOLOGY PROGRESS SERIES,728. |
| MLA | "Comparison of feeding niches between Arctic and northward-moving sub-Arctic marine mammals in Greenland".MARINE ECOLOGY PROGRESS SERIES 728(2024). |
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