Multi-decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position.
Multi-decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position.
复制标题
北大西洋竖琴海豹牙齿生物标志物的数十年趋势揭示了猎物可用性对海豹营养位置的影响。
DOI：
10.1111/gcb.16889
复制
发表时间：
2023
影响因子：
11.6
通讯作者：
De La Vega C
中科院分区：
文献类型：
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作者：
De La Vega C
北极食物网正受到北方化和环境变化的影响。为了量化这些多重强迫的影响，关键是要准确地确定关键生态系统指标的时间变化，如顶级捕食者的营养位置。在这里，我们测量了横跨北大西洋的格陵兰海豹牙齿中氨基酸的稳定氮同位素（δ 15 N），时间跨度为60年，以有力地评估格陵兰海豹营养地位的数十年趋势，解释食物网底部δ 15 N的变化。我们揭示了格陵兰海豹营养位置的长期变化，这可能反映了猎物可用性的波动，特别是鱼类或无脊椎动物为主的饮食。我们发现，格陵兰海豹营养位置的时间趋势在西北大西洋，格陵兰海和巴伦支海之间存在差异，这表明在每个地方的生态系统的不同变化。我们的研究结果为种群动态和生态毒理学研究提供了宝贵的数据。
Arctic food webs are being impacted by borealisation and environmental change. To quantify the impact of these multiple forcings, it is crucial to accurately determine the temporal change in key ecosystem metrics, such as trophic position of top predators. Here, we measured stable nitrogen isotopes (δ15N) in amino acids in harp seal teeth from across the North Atlantic spanning a period of 60 years to robustly assess multi‐decadal trends in harp seal trophic position, accounting for changes in δ15N at the base of the food web. We reveal long‐term variations in trophic position of harp seals which are likely to reflect fluctuations in prey availability, specifically fish‐ or invertebrate‐dominated diets. We show that the temporal trends in harp seal trophic position differ between the Northwest Atlantic, Greenland Sea and Barents Sea, suggesting divergent changes in each local ecosystem. Our results provide invaluable data for population dynamic and ecotoxicology studies.