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首页> 外文期刊>Paleoceanography >Tracing shifts of oceanic fronts using the cryptic diversity of the planktonic foraminifera Globorotalia inflata
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Tracing shifts of oceanic fronts using the cryptic diversity of the planktonic foraminifera Globorotalia inflata

机译：利用浮游有孔虫Globorotalia inflata的神秘多样性追踪海洋锋线的变化

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The use of planktonic foraminifera in paleoceanographic studies relies on the assumption that morphospecies represent biological species with ecological preferences that are stable through time and space. However, genetic surveys unveiled a considerable level of diversity in most morphospecies of planktonic foraminifera. This diversity is significant for paleoceanographic applications because cryptic species were shown to display distinct ecological preferences that could potentially help refine paleoceanographic proxies. Subtle morphological differences between cryptic species of planktonic foraminifera have been reported, but so far, their applicability within paleoceanographic studies remains largely unexplored. Here we show how information on genetic diversity can be transferred to paleoceanography using Globorotalia inflata as a case study. The two cryptic species of G. inflata are separated by the Brazil-Malvinas Confluence (BMC), a major oceanographic feature in the South Atlantic. Based on this observation, we developed a morphological model of cryptic species detection in core top material. The application of the cryptic species detection model to Holocene samples implies latitudinal oscillations in the position of the confluence that are largely consistent with reconstructions obtained from stable isotope data. We show that the occurrence of cryptic species in G. inflata can be detected in the fossil record and used to trace the migration of the BMC. Since a similar degree of morphological separation as in G. inflata has been reported from other species of planktonic foraminifera, the approach presented in this study can potentially yield a wealth of new paleoceanographical proxies.
机译：在古海洋学研究中使用浮游有孔虫的前提是，形态物种代表具有生态偏好且在时间和空间上稳定的生物物种。然而，遗传调查揭示了浮游有孔虫的大多数形态物种中相当大的多样性。这种多样性对于古海洋学的应用意义重大，因为隐性物种显示出独特的生态偏好，这可能有助于提炼古海洋学的代理人。据报道，浮游有孔虫的隐性物种之间存在细微的形态学差异，但到目前为止，它们在古海洋学研究中的适用性仍未得到充分探索。在这里，我们展示了如何使用膨胀性globorotalia inflata作为案例研究，将遗传多样性信息转移到古海洋学。膨胀的G.inflata的两个隐性物种被南大西洋的主要海洋学特征巴西-马尔维纳斯汇合处（BMC）隔开。基于此观察结果，我们开发了核心顶部材料中隐性物种检测的形态模型。将隐种检测模型应用于全新世样品意味着合流位置的纬度振荡，这与从稳定同位素数据获得的重建结果基本一致。我们表明，在化石记录中可以检测到G. inflata中隐性物种的发生，并用于追踪BMC的迁移。由于已经从其他浮游有孔虫物种中报告了与膨胀假单胞菌相似的形态分离程度，因此本研究中提出的方法可能会产生大量新的古海洋学代理。

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