Shells of the bivalve Astarte moerchi give new evidence of a strong pelagic-benthic coupling shift occurring since the late 1970s in the North Water polynya
Shells of the bivalve Astarte moerchi give new evidence of a strong pelagic-benthic coupling shift occurring since the late 1970s in the North Water polynya
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双壳类动物 Astarte moerchi 的壳提供了自 20 世纪 70 年代末以来北水冰间湖发生强烈的中上层-底栖耦合转变的新证据
DOI：
10.1098/rsta.2019.0353
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
P. Archambault
中科院分区：
文献类型：
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作者：
F. Olivier;Blandine Gaillard;J. Thébault;T. Meziane;R. Tremblay;D. Dumont;S. Bélanger;Michel Gosselin;A. Jolivet;L. Chauvaud;A. Martel;S. Rysgaard;A. Olivier;J. Pettré;J. Mars;Silvain Gerber;P. Archambault
北极的气候变化可能会削弱目前紧密的水层-海底耦合。为了应对海冰覆盖面积的减少，北极海洋系统预计将从“海冰藻类-底栖生物”转变为“浮游植物-浮游动物”主导。我们使用软体动物的贝壳作为生物档案和脂肪酸营养标志物来估计海冰覆盖减少对输出到海底的食物的影响。生活在北方巴芬湾600米深处的双壳类Astarte moerchi揭示了自20世纪70年代末以来生长变化和Ba/Ca比值的明显变化，这与食物供应的变化有关。组织脂肪酸组成表明，该物种主要以从真光层输出到海底的微藻为食。因此，我们认为，在远洋底栖耦合的变化可能是由于当地的海冰动态变化，介导的自下而上的调节海冰对浮游植物的生产，或浮游植物水华和浮游动物之间的不匹配放牧由于物候变化。这两种可能性都可以更经常和更多地将食物转移到海底。这篇文章是“变化中的北冰洋：对生物群落、地球化学过程和生态系统功能的影响”主题的一部分。
Climate changes in the Arctic may weaken the currently tight pelagic-benthic coupling. In response to decreasing sea ice cover, arctic marine systems are expected to shift from a ‘sea-ice algae–benthos' to a ‘phytoplankton-zooplankton’ dominance. We used mollusc shells as bioarchives and fatty acid trophic markers to estimate the effects of the reduction of sea ice cover on the food exported to the seafloor. Bathyal bivalve Astarte moerchi living at 600 m depth in northern Baffin Bay reveals a clear shift in growth variations and Ba/Ca ratios since the late 1970s, which we relate to a change in food availability. Tissue fatty acid compositions show that this species feeds mainly on microalgae exported from the euphotic zone to the seabed. We, therefore, suggest that changes in pelagic-benthic coupling are likely due either to local changes in sea ice dynamics, mediated through bottom-up regulation exerted by sea ice on phytoplankton production, or to a mismatch between phytoplankton bloom and zooplankton grazing due to phenological change. Both possibilities allow a more regular and increased transfer of food to the seabed. This article is part of the theme issue ‘The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning'.
Arctica islandica贝壳中的Ba/Ca比率â潜在的环境代理和交叉约会工具
DOI：
10.1016/j.palaeo.2015.12.018
发表时间：
2017
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
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作者：
Marali S;Schöne BR;Mertz-Kraus R;Griffin SM;Wanamaker Jr AD;Matras U;Butler PG
通讯作者：
Butler PG