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Macrobenthic composition of the southeast continental shelf of India

机译：印度东南大陆架的大型底栖动物组成

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Macrobenthic faunal composition was studied at six different depth ranges (30-50, 51-75, 76-100, 101-150, 151-175 and > 176 m) in five transects (off Karaikkal, Parangipettai, Cuddalore-SIPCOT, Cheyyur and Chennai) in the continental shelf of southeast coast of India. Eleven diverse taxa were found, comprising 113 species of polychaetes, 14 species of bivalves, 10 species of amphipods and 'others' (five tanaids, five crabs, four isopods, three echinoderms, two shrimps, two cnidarians, two fishes and one cephalochordate). Polychaetes were the dominant taxa, constituting 88.5% of the total abundance and 30.7% of the total biomass. The number of species (seven per 0.2 m(2) at > 176 m depth range in Chennai to 46 per 0.2 m(2) at 30-50 m in Cheyyur), abundance (216 per 0.2 m(2) at > 176 m in Karaikkal to 353 per 0.2 m(2) at 3050 m in Cheyyur) and biomass (0.09 g per 0.2 m(2) at 151-175 m in Karaikkal and 4.6 g per 0.2 m(2) at 30-50 m in Cheyyur) of macrobenthos decreased with increase in depth. DO decreased gradually from 30 m depth; beyond 150 m, the decrease was pronounced due to the presence of the oxygen minimum zone. Using the distance based linear model (DISTLM), it was found that the environmental variables explained about 73.3% of the total variability in macrofaunal distribution. The heavy metals cobalt and mercury, as well as water pressure (proxy for depth), showed a significant relationship with macrofauna, explaining respectively 9, 7.3 and 7% of the total variability. The contribution of other variables was smaller.
机译：在五个样带（Karaikkaal，Parangipettai，Cuddalore-SIPCOT，Cheyyur和yes）的六个样带中研究了六个不同深度范围（30-50、51-75、76-100、101-150、151-175和> 176 m）的大型底栖动物组成。钦奈）在印度东南沿海的大陆架上。发现了11种不同的分类单元，包括113种的多毛类动物，14种的双壳类动物，10种的两栖类动物和“其他”类（5个tana类动物，5个螃蟹，4个等足类动物，3个棘皮动物，2个虾，2个刺胞动物，2个鱼类和1个头主菜） 。多毛类是主要的分类单元，占总丰度的88.5％和总生物量的30.7％。物种数量（Chennai> 176 m深度范围内每0.2 m（2）七种，Cheyyur在30-50 m处每0.2 m（2）六种），丰度（> 176 m处每0.2 m（2）216种）在Karaikkal中增加到353，每30m处Cheyyur的0.2 m（2）为353）和生物量（在Karaikkal中151-175 m处的每0.2 m（2）0.09 g和30-50 m的Cheyyur的每0.2 m（2）4.6 g大底栖动物的深度随深度的增加而减小。 DO从30 m深度逐渐减小；超过150 m时，由于氧气最小区域的存在，减少明显。使用基于距离的线性模型（DISTLM），发现环境变量解释了大型动物分布中总变异性的73.3％。重金属钴和汞以及水压（代表深度）与大型动物之间存在显着关系，分别解释了总变异性的9、7.3和7％。其他变量的贡献较小。

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