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首页> 外文期刊>Polar biology >Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis
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Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis

机译：南大洋硅藻Fergilariopsis kerguelensis的两种形态型之间的生物地理分化

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摘要

Fragilariopsiskerguelensis (O' Meara) Hust. is a ubiquitous diatom of the Southern Ocean. Its thick frustules are the numerically dominant component of the siliceous sediment layer covering large parts of the seafloor beneath. Morphometric variability of frustules of this diatom has been of interest for paleoenvironmental reconstructions. Recently, two morphotypes differentiated by the morphometric descriptor rectangularity were described from a Southern Ocean sediment core, the relative abundance of which correlated with reconstructed paleotemperatures. In the present study, we use semi-automated microscopic and image analysis methods to answer whether these morphotypes also appear in recent assemblages, and if yes, do their distributions reflect geographic location or environmental factors. Three transects from the water column, sampled along the Greenwich meridian with hand nets, and one sediment surface transect from the South Pacific, were analyzed. In each of these transects, both morphotypes were detected, and annual mean sea surface temperatures (SST) were found to be a good predictor of their relative abundances. The transition between dominance of one or the other morphotype appeared roughly between the Antarctic Polar Front and the Southern Boundary of the Antarctic Circumpolar Current. Although more extensive circumpolar sampling will be needed to confirm the generality of our conclusions, the observed morphometric cline is a novel aspect of the biology of this species and can in the future potentially be used for further developing paleoproxies especially for highly F.kerguelensis-dominated sediment in the Southern Ocean.
机译：Fragilariopsiskerguelensis（O'Meara）必需。是南大洋无处不在的硅藻。其厚的壳层是硅质沉积物层的数字主导成分，覆盖了海底的大部分下部。硅藻壳的形态学变异性已引起古环境重建的关注。最近，从南大洋沉积物核心描述了两种由形态计量描述符矩形区分的形态型，它们的相对丰度与重建的古温度有关。在本研究中，我们使用半自动显微镜和图像分析方法来回答这些形态类型是否也出现在最近的组合中，如果是，它们的分布是否反映了地理位置或环境因素。分析了水柱的三个横断面，沿着格林威治子午线用手网采样，分析了一个南太平洋的沉积物横断面。在这些样带的每一个中，均检测到两种形态，并且发现年平均海表温度（SST）是其相对丰度的良好预测指标。一个或另一个形态类型的优势之间的过渡大致出现在南极极地锋和南极绕极洋流的南边界之间。尽管需要更广泛的绕极采样来证实我们结论的普遍性，但是观察到的形态学谱系是该物种生物学的一个新方面，并且将来有可能用于进一步发展古近系，特别是对于高度以F.kerguelensis为主的古近界南部海洋中的沉积物。

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  • 来源
    《Polar biology》 |2019年第7期|1369-1376|共8页
  • 作者

    Glemser Barbara; Kloster Michael; Esper Oliver; Eggers Sarah Lena; Kauer Gerhard; Beszteri Bank;

  • 作者单位

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany;

    Univ Appl Sci Emden Leer, Constantiapl 4, D-26723 Emden, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany|Univ Duisburg Essen, Univ Str 5, D-45141 Essen, Germany;

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  • 正文语种 eng
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  • 关键词

    Fragilariopsiskerguelensis; Rectangularity; Morphometrics; Biogeography;

    机译：Frosililiopskerguelensis;矩形;形态学仪;生物地理;

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