Department of Zoology, Kazan Federal University, 420008, Kazan, Russia.
Department of Life Sciences, Marine and Environmental Sciences Centre, University of Coimbra, 3000-456, Coimbra, Portugal.
Sci Rep. 2020 Dec 9;10(1):21506. doi: 10.1038/s41598-020-78645-z.
Trophic niche and diet comparisons among closely sympatric marine species are important to understand complex food webs, particularly in regions most affected by climate change. Using stable isotope analyses, all ontogenetic stages of three sympatric species of Arctic cephalopods (genus Rossia) were studied to assess inter- and intraspecific competition with niche and diet overlap and partitioning in West Greenland and the Barents Sea. Seven traits related to resource and habitat utilization were identified in Rossia: no trait was shared by all three species. High boreal R. megaptera and Arctic endemic R. moelleri shared three traits with each other, while both R. megaptera and R. moelleri shared only two unique traits each with widespread boreal-Arctic R. palpebrosa. Thus all traits formed fully uncrossing pattern with each species having unique strategy of resource and habitat utilization. Predicted climate changes in the Arctic would have an impact on competition among Rossia with one potential 'winner' (R. megaptera in the Barents Sea) but no potential 'losers'.
研究近缘共生的海洋物种的营养生态位和食性比较对于理解复杂的食物网非常重要，特别是在受气候变化影响最严重的地区。本研究利用稳定同位素分析，对格陵兰西部和巴伦支海的三种共生北极头足类动物（罗斯亚属）的所有个体发育阶段进行了研究，以评估种间和种内竞争、生态位重叠和食性划分。在罗斯亚属中确定了与资源和生境利用相关的七个特征：没有一个特征为三个物种所共有。高纬度的 R. megaptera 和北极特有种 R. moelleri 彼此之间有三个共同特征，而 R. megaptera 和 R. moelleri 各自与广泛分布于北极-高纬度的 R. palpebrosa 仅有两个独特的共同特征。因此，所有特征形成了完全不交叠的模式，每个物种都有独特的资源和生境利用策略。北极地区预测的气候变化将对罗斯亚属之间的竞争产生影响，但没有潜在的“输家”。
