Multi-decadal environmental change in the Barents Sea recorded by seal teeth.
Multi-decadal environmental change in the Barents Sea recorded by seal teeth.
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DOI：
10.1111/gcb.16138
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发表时间：
2022-05
影响因子：
11.6
通讯作者：
中科院分区：
文献类型：
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气候变暖、海洋环流和营养供应的变化等多种环境强迫因素正在影响北极海洋生态系统的基础，并通过自下而上的控制对整个食物网产生级联效应。稳定氮同位素（δ 15 N）可以用来检测和解开这些强迫对这个独特的生态系统的影响，如果影响δ 15 N值的许多过程受到限制。结合竖琴海豹牙齿上化合物特异性δ 15 N生物标志物的独特60年记录以及最先进的海洋建模，我们观察到从1951年到2012年巴伦支海食物网底部的δ 15 N值显著下降。这一强烈而持续的十年趋势的出现是由于大西洋人为大气氮沉降、大西洋水通过北极门户向北输送的增加以及北极初级生产增加的当地反馈。我们的研究结果表明，至少60年来，北极生态系统一直在对人类活动引起的本地和远程驱动因素做出反应，这些驱动因素与不断变化的海洋生物学、化学和物理学有关。考虑到食物网底部δ 15 N值的这些趋势，对于在这种快速变化的环境中准确检测生态系统重构至关重要。据预测，自下而上相对于自上而下的控制将增加北极食物网。因此，在北极食物网的基础上检测变化并确定其驱动因素对于预测食物网动态至关重要。结合格陵兰海豹存档牙齿中苯丙氨酸的稳定氮同位素（δ 15 N），以及海洋地球化学模型的结果，我们显示了巴伦支海食物网底部δ 15 N值的60年下降，这是由大西洋人为大气氮沉积，通过北极门户向北输送大西洋水的增加以及北极初级生产增加的当地反馈驱动的。
Multiple environmental forcings, such as warming and changes in ocean circulation and nutrient supply, are affecting the base of Arctic marine ecosystems, with cascading effects on the entire food web through bottom‐up control. Stable nitrogen isotopes (δ15N) can be used to detect and unravel the impact of these forcings on this unique ecosystem, if the many processes that affect the δ15N values are constrained. Combining unique 60‐year records from compound specific δ15N biomarkers on harp seal teeth alongside state‐of‐the‐art ocean modelling, we observed a significant decline in the δ15N values at the base of the Barents Sea food web from 1951 to 2012. This strong and persistent decadal trend emerges due to the combination of anthropogenic atmospheric nitrogen deposition in the Atlantic, increased northward transport of Atlantic water through Arctic gateways and local feedbacks from increasing Arctic primary production. Our results suggest that the Arctic ecosystem has been responding to anthropogenically induced local and remote drivers, linked to changing ocean biology, chemistry and physics, for at least 60 years. Accounting for these trends in δ15N values at the base of the food web is essential to accurately detect ecosystem restructuring in this rapidly changing environment. Bottom‐up relative to top‐down control has been predicted to increase in Arctic food webs. Detecting changes and determining their drivers at the base of the Arctic food web is therefore crucial for forecasting food web dynamics. Combining stable nitrogen isotopes (δ15N) of phenylalanine from archived teeth of harp seals, and results from an ocean‐biogeochemical model, we show a 60‐year decline of δ15N values at the base of the Barents Sea food web, driven by anthropogenic atmospheric nitrogen deposition in the Atlantic, increased northward transport of Atlantic water through Arctic gateways and local feedbacks from increasing Arctic primary production.
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DOI：
10.1098/rspb.2015.1546
发表时间：
2015-09-07
期刊：
Proceedings. Biological sciences
影响因子：
--
作者：
Kortsch S;Primicerio R;Fossheim M;Dolgov AV;Aschan M
通讯作者：
Aschan M
影响因子：
30.7
作者：
Fossheim, Maria;Primicerio, Raul;Dolgov, Andrey V.
通讯作者：
Dolgov, Andrey V.
DOI：
10.1073/pnas.1516847113
发表时间：
2016-01-26
影响因子：
11.1
作者：
Altieri, Katye E.;Fawcett, Sarah E.;Hastings, Meredith G.
通讯作者：
Hastings, Meredith G.
影响因子：
8.8
作者：
Boyce, Daniel G.;Frank, Kenneth T.;Leggett, William C.
通讯作者：
Leggett, William C.
影响因子：
2.3
作者：
Fieg, Kerstin;Gerdes, Ruediger;Schauer, Ursula
通讯作者：
Schauer, Ursula