Vertical distribution of planktic foraminifera through an oxygen minimum zone: how assemblages and test morphology reflect oxygen concentrations
Vertical distribution of planktic foraminifera through an oxygen minimum zone: how assemblages and test morphology reflect oxygen concentrations
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DOI：
10.5194/bg-18-977-2021
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发表时间：
2021-02-10
期刊：
影响因子：
4.9
通讯作者：
Hull, Pincelli M.
中科院分区：
文献类型：
--
作者：
Davis, Catherine, V;Wishner, Karen;Hull, Pincelli M.
全球海洋的缺氧区域正在迅速扩大，这对全球海洋地球化学循环具有重要影响。然而，由于缺乏经验数据来测试和约束全球气候和海洋学模型的行为，我们对海洋中氧气未来的预测能力受到限制。我们使用深度分层的浮游生物拖证明，一些物种的浮游有孔虫是适应生活在远洋最低含氧区（OMZ）的心脏。特别是，我们发现了两个物种，Globorotaloides hexagonus和Hastigerina parapelagica，生活在北太平洋热带东部OMZ内。前者的测试保存在海洋沉积物中，可用于追踪化石记录中低氧远洋生境的范围和强度。对G.六边形表明，在最低氧气环境中发现的测试更大，更多孔，密度更低，并且在最后的螺纹中具有更多的腔室。该物种与OMZ的关联及其对环境氧合反应的明显可塑性，邀请使用G。在沉积物芯的hexagonus测试作为潜在的代理上覆OMZ的存在和强度。
Oxygen-depleted regions of the global ocean are rapidly expanding, with important implications for global biogeochemical cycles. However, our ability to make projections about the future of oxygen in the ocean is limited by a lack of empirical data with which to test and constrain the behavior of global climatic and oceanographic models. We use depth-stratified plankton tows to demonstrate that some species of planktic foraminifera are adapted to life in the heart of the pelagic oxygen minimum zone (OMZ). In particular, we identify two species, Globorotaloides hexagonus and Hastigerina parapelagica, living within the eastern tropical North Pacific OMZ. The tests of the former are preserved in marine sediments and could be used to trace the extent and intensity of low-oxygen pelagic habitats in the fossil record. Additional morphometric analyses of G. hexagonus show that tests found in the lowest oxygen environments are larger, more porous, less dense, and have more chambers in the final whorl. The association of this species with the OMZ and the apparent plasticity of its test in response to ambient oxygenation invites the use of G. hexagonus tests in sediment cores as potential proxies for both the presence and intensity of overlying OMZs.