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首页> 外文期刊>Polar biology >Biochemical characteristics of surface sediments on the eastern Weddell Sea continental shelf, Antarctica: is there any evidence of seasonal patterns?
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Biochemical characteristics of surface sediments on the eastern Weddell Sea continental shelf, Antarctica: is there any evidence of seasonal patterns?

机译：南极韦德海东部大陆架表层沉积物的生化特征：是否有季节性特征的证据？

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摘要

Biochemical characteristics of seafloor sedi ment off Austasen in the southeastern Weddell Sea were assayed in samples recovered in the early autumn and late spring of 2000 and 2003, respectively. Sediment was sepa rated in the grain-size fractions >200 μm and <200 μm to distinguish biochemical characteristics in the fraction avail able for benthic suspension feeders (<200 μm). In the bulk sediment, the lipid (LPD) and carbohydrate (CHO) contents were significantly different between seasons with higher LPD content in the early autumn and higher CHO content in the late spring. In the grain-size fractions <200 μm, the LPD and protein (PRT) contents were significantly higher in the early autumn meaning that in this season the fraction available for benthic suspension feeders presented higher nutritive value. The relatively higher CHO concentrations observed in each fraction in the late spring were attributed to refractory matter, whereas the higher PRT and LPD con centrations found during the early autumn were associated with planktonic material settled after the summer phyto plankton bloom. Our results suggest that there is seasonal variation in the composition of organic matter in the sedi ment, with better nutritive quality in the early autumn, especially in the grain-size fraction available for benthic suspension feeders. These variations also suggest that the benthic community exploits the fresh organic matter accu mulated after the summer throughout the Antarctic dark months leaving the sediment almost exhaust of LPD and with higher CHO contents, presumably of refractory nature, at the onset of the seasonal phytoplankton bloom of the fol lowing year.
机译：在2000年和2003年秋季初秋和春季末分别采集的样品中分析了东南韦德海Austasen附近海底沉积物的生化特征。分别以大于200μm和<200μm的颗粒级分对沉积物进行分级，以区分底栖悬浮物进料器（<200μm）可用级分中的生化特性。在散装沉积物中，脂质（LPD）和碳水化合物（CHO）的含量在各个季节之间存在显着差异，秋季初的LPD含量较高，而春季末的CHO含量较高。在<200μm的粒度级分中，LPD和蛋白质（PRT）含量在初秋时显着较高，这意味着在本季节，底栖悬浮饲养者可用的级分具有较高的营养价值。春末在每个馏分中观察到的相对较高的CHO浓度归因于难熔物质，而初秋期间发现的较高PRT和LPD浓度与夏季植物浮游生物开花后沉降的浮游物质有关。我们的研究结果表明，沉积物中有机物的成分存在季节性变化，秋季初的营养品质更好，尤其是底栖悬浮物饲养者可用的粒度级分。这些变化还表明，底栖动物群落利用了整个南极黑暗月份夏季之后累积的新鲜有机物，使沉积物几乎耗尽了LPD，并且在该季节季节性浮游植物开始开花时，其CHO含量较高，可能是难降解的。次年。

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  • 来源
    《Polar biology》 |2011年第8期|p.1125-1133|共9页
  • 作者

    Enrique Isla; Dieter Gerdes; Sergio Rossi; Ida Fiorillo; Elisabet Sane; Josep-Maria Gili; Wolf E.Arntz;

  • 作者单位

    Institut de Ciencies del Mar-CSIC,Passeig Maritim de la Barceloneta, 37-49,08003 Barcelona, Spain;

    Alfred-Wegener-Institute for Polar- and Marine Research,Columbusstr., 27568 Bremerhaven, Germany;

    Institut de Ciencia i Tecnologia Ambientals,Universitat Autdnoma de Barcelona (UAB),Campus Cn UAB s, 08193 Cerdanyola Del Valles, Spain;

    Institut de Ciencies del Mar-CSIC,Passeig Maritim de la Barceloneta, 37-49,08003 Barcelona, Spain;

    Institut de Ciencies del Mar-CSIC,Passeig Maritim de la Barceloneta, 37-49,08003 Barcelona, Spain;

    Institut de Ciencies del Mar-CSIC,Passeig Maritim de la Barceloneta, 37-49,08003 Barcelona, Spain;

    Alfred-Wegener-Institute for Polar- and Marine Research,Columbusstr., 27568 Bremerhaven, Germany;

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  • 关键词

    antarctica; lipids; sediment geochemistry; weddell sea; continental shelf; proteins;

    机译：南极洲;脂质沉积物地球化学韦德尔海陆架;蛋白质;

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