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首页> 外文期刊>Marine Environmental Research >Discriminating zooplankton assemblages in neritic and oceanic waters: A case for the northeast coast of India, Bay of Bengal
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Discriminating zooplankton assemblages in neritic and oceanic waters: A case for the northeast coast of India, Bay of Bengal

机译：区分浅水和海洋水域的浮游动物组合：以印度东北海岸，孟加拉湾为例

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Zooplankton species distribution and abundance data at 17 locations in the inshore (10-30 m), shelf (50-200 m) and oceanic (2500-2800 m) regions off northeast India (Bay of Bengal) during January 1999-April 2001 revealed 112 taxa represented by 30 divergent groups. Cope-pods (58 species) dominated (87%) the population numerically. In general zooplankton diversity (Margalef richness d, Shannon-Wiener H', Pielou's evenness J') increased in the direction of the open sea relative to coastal locations with a concomitant decrease both in abundance (ind m~(-3)) and biomass (dry mass m~(-3)). Based on multivariate analyses, it was possible to distinguish the zooplankton community into different assemblages according to their location (e.g., inshore, shelf, oceanic) and seasonality. While Acrocalanus sp., Oithona sp., Corycaeus danae, Euterpina acutifrons, Paracalanus sp., and Acartia sp. were found characterizing the coastal locations, Oncaea venusta was the discriminating species for shelf waters. In oceanic areas, there was a clear dominance of Labidocera sp., Candacia sp., Euchaeta rimana, Centra-pages calaninus, Copilia mirabilis and Corycella gibbula. The investigations revealed that changes in zooplankton community structure across water bodies could be associated with differing salinity. During November 1999 (post-monsoon), when salinity in the coastal waters was relatively low (26-28.9 PSU), the zooplankton community consisted of mainly Acrocalanus sp., Salpa, Corycaeus danae, Oikopleura sp., Acartia sp., Evadne tergestina, and Creseis sp. In January 2000 (salinity 32.4-34.1), additionally Corycella gibbula, Labidocera sp., Centra-pages sp., Microsetella sp., Euterpina acutifrons, Canthocalanus pauper, and Oncaea venusta represented the population discriminating the assemblage from others. In May 2000 (pre-mon-soon) when salinity was highest (34.7-35.3), Oithona sp., Paracalanus sp., and Acrocalanus gibber were found important. Chaetognaths formed a distinct group during this period. Results presented during this investigation are considered significant since no previous studies exist for this locale drawing comparisons of the kind made during this study between coastal and oceanic situations.
机译：在1999年1月至2001年4月期间，印度东北部（孟加拉湾）近海（10-30 m），陆架（50-200 m）和海洋（2500-2800 m）地区的17个位置的浮游动物种类分布和丰度数据显示30个不同类别代表112个分类单元。角荚果豆（58种）在数量上占主导地位（87％）。在总体上，相对于沿海地区，浮游动物的多样性（Margalef丰富度d，Shannon-Wiener H'，Pielou的均匀度J'）在公海方向上增加，同时其丰度（ind m〜（-3））和生物量均减少（干质量m〜（-3））。基于多变量分析，可以根据其位置（例如，近海，陆架，海洋）和季节性将浮游动物群落区分为不同的组合。而Acrocalanus sp。，Oithona sp。，Corycaeus danae，Euterpina acutifrons，Paracalanus sp。和Acartia sp.。被发现是沿海地区的特征，Oncaea venusta是架子水的鉴别物种。在大洋地区，明显有Labidocera sp。，Candacia sp。，Euchaeta rimana，Centra-pages calaninus，Copilia mirabilis和Corycella gibbula优势。调查表明，水体中浮游动物群落结构的变化可能与盐度的不同有关。在1999年11月（季风后）期间，当沿海水域的盐度相对较低（26-28.9 PSU）时，浮游动物群落主要由Ac棘属，萨尔帕，丹参，Oikopleura属，Acartia属，Evadne tergestina组成。和Creseis sp。在2000年1月（盐度32.4-34.1），另外还有巨嘴鸟（Corycella gibbula），Labidocera sp。，Centra-pages sp。，Microsetella sp。，Euterpina acutifrons，Canthocalanus pauper和Oncaea venusta代表了该族群与其他族群的区别。在盐度最高（34.7-35.3）的2000年5月（季风前），发现了Oithona sp。，Paracalanus sp。和Acrocalanus gibber很重要。在此期间，Chaetognaths组成了一个独特的群体。这项研究期间提出的结果被认为是有意义的，因为该地区没有先前的研究，因此没有进行该研究在沿海和海洋情况之间进行的比较。

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