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首页> 外文期刊>Marine ecology >Macrofaunal community structure in the western Indian continental margin including the oxygen minimum zone
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Macrofaunal community structure in the western Indian continental margin including the oxygen minimum zone

机译：印度西部大陆边缘的大型动物群落结构，包括最低氧区

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摘要

Patterns of macrofaunal distribution were studied along the western Indian continental margin to distinguish the role of habitat heterogeneity in generating and maintaining community structure. A transect perpendicular to the coast at 14°N latitude was selected for seabed sampling. Eight stations were sampled in the depth range 34-2546 m and characterized with respect to macrofaunal composition, abundance, biomass, diversity and feeding type. The sediments in the shelf region (34, 48, 100 m) and upper slope (525 m) were characterized by silty and sandy facies, whereas the mid slope (1001 m), lower slope (1524 m) and basin (2001, 2546 m) consisted of clayey silts. The highest value of sediment chlorophyll-a (Chl-a) and total organic carbon (C_(org)) were recorded from the mid slope areas. Faunal abundance and biomass increased from the shallow to deeper depths in the shelf region, and decreased in the slope region (525-1001 m) due to the reduced bottom-water oxygen. The community parameters showed an overall increase in both the lower slope and basin areas. A total of 81 macro-invertebrate species belonging to five major groups represented the macrofauna of the area. Polychaeta was the major group at all depths. Among polychaete families, species of the Spionidae, particularly Prionospio pinnata, predominated at the oxygen minimum zone (OMZ) core and Cossuridae dominated in the lower part of the OMZ in sediments of the mid slope region (1001 m depth). Species diversity was higher in the basin than in the slope region. Fluctuations in diversity appear to be partly due to the bottom-water dissolved oxygen (DO) gradient which includes values that are below the oxygen tolerance of many benthic species. Further, Marga-lefs index (d) and Shannon-Wiener index (H') showed a significant negative (P < 0.01) relationship between sediment Chl-a and C_(org), suggesting food availability as a critical factor in species dominance. Results of multivariate analyses suggest that for continental margin fauna, different physiographic provinces and an oxygen gradient have a higher influence on the species composition and diversity than other oceanographic conditions.
机译：研究了沿印度西部大陆边缘的大型动物分布模式，以区分栖息地异质性在产生和维持群落结构中的作用。选择在北纬14°N垂直于海岸的样带进行海床采样。在34-2546 m的深度范围内对8个站进行了采样，并根据大型动物组成，丰度，生物量，多样性和摄食类型进行了特征化。陆架区（34、48、100 m）和上坡（525 m）的沉积物以粉质和沙质相为特征，而中坡（1001 m），下坡（1524 m）和盆地（2001，2546）具有特征。 m）由黏土淤泥组成。在中坡地区记录了最高的沉积物叶绿素a（Chl-a）和总有机碳（C_（org））值。由于底水氧气减少，棚架区的动物丰度和生物量从浅到深增加，而在斜坡区（525-1001 m）减少。群落参数显示出较低坡度和盆地面积的总体增加。该地区的大型动物共有五个大类的81种大型无脊椎动物。 Polychaeta是各个深度的主要群体。在多毛et科中，中坡区（1001 m深度）沉积物中的天蛾科物种，特别是斑尾对虾（Prionospio pinnata）物种占主导地位，而在最低限度氧气（OMZ）下部则占优势科（Cossuridae）。流域的物种多样性高于坡地。多样性的波动似乎部分归因于底水溶解氧（DO）梯度，该梯度的值低于许多底栖生物的耐氧性。此外，Marga-lefs指数（d）和Shannon-Wiener指数（H'）在沉积物Chl-a和C_（org）之间显示出显着的负相关（P <0.01），表明食物可利用性是物种优势的关键因素。多元分析的结果表明，对于大陆边缘动物，与其他海洋条件相比，不同的地理学省份和氧梯度对物种组成和多样性的影响更大。

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  • 来源
    《Marine ecology》 |2010年第1期|148-166|共19页
  • 作者

    Baban S. Ingole; Sabyasachi Sautya; Sanitha Sivadas; Ravail Singh; Mandar Nanajkar;

  • 作者单位

    National Institute of Oceanography (Council of Scientific & Industrial Research), Dona Paula, Goa, India;

    rnNational Institute of Oceanography (Council of Scientific & Industrial Research), Dona Paula, Goa, India;

    rnNational Institute of Oceanography (Council of Scientific & Industrial Research), Dona Paula, Goa, India;

    rnNational Institute of Oceanography (Council of Scientific & Industrial Research), Dona Paula, Goa, India;

    rnNational Institute of Oceanography (Council of Scientific & Industrial Research), Dona Paula, Goa, India;

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  • 正文语种 eng
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  • 关键词

    Arabian Sea; continental margin; deep sea; habitat heterogeneity; macrofauna; oxygen minimum zone;

    机译：阿拉伯海;大陆边缘深海;生境异质性大型动物氧气最小区;

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