Vertical structure of small metazoan plankton, especially non-calanoid copepods .1. Deep Arabian Sea
Vertical structure of small metazoan plankton, especially non-calanoid copepods .1. Deep Arabian Sea
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DOI：
10.1093/plankt/18.7.1073
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发表时间：
1996-07-01
影响因子：
2.1
通讯作者：
BottgerSchnack, R
中科院分区：
文献类型：
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作者：
BottgerSchnack, R
在季风间期(1987年4/5月)，对阿拉伯海3个站位的0.05 mm网目微型后生动物的丰度和垂直分布进行了研究。在上层(0-100m)，生物量和后生动物丰度的值往往高于其他热带海洋地区的报告。在以100~1000m深度极度缺氧为特征的中远洋带，后生动物类群的丰度和非金枪鱼桡足类的物种数量都大大减少。然而，中等丰度峰值出现在该带内，以特定的后生动物类群(桡足类、附肢动物)和非金枪类动物(Oncaea sp.)为主。c)。在1050m以下的深海带，桡足科优势种的物种多样性显著增加。在总共发现的69种钉螺中，三分之二被限制在这一层。由于它们大多体型较小，且仅以低丰度出现，因此总钉螺密度和/或浮游生物生物量的增加不太明显。深海带优势种为长吻螺属和布罗氏螺属。这一结果与阿拉伯海和其他热带海洋地区公布的数据进行了比较，这些地区有或没有极端的中层氧最小区域。讨论了缺氧区出现中等丰度极大值的可能原因。
The abundance and vertical distribution of micro-metazoans sampled with fine nets of 0.05 mm mesh size were studied at three stations in the Arabian Sea during the intermonsoon period (April/May 1987) and down to 1850 m depth. In the epipelagic zone (0-100 m), values of biomass and metazoan abundance tended to be higher than those reported for other tropical oceanic areas. In the mesopelagic zone, which is characterized by an extreme oxygen deficiency between 100 and 1000 m depth, the abundance of metazoan taxa and species numbers of non-calanoid copepods were largely reduced. However, intermediate abundance maxima occurred within this zone, which were dominated by specific metazoan taxa (copepods, appendicularians) and species of non-calanoids (Oncaea sp. C). In the bathypelagic zone below 1050 m, the species diversity of the dominant copepod family Oncaeidae increased substantially. Two-thirds of a total of 69 oncaeid species recovered were confined to this layer. As most of them were small in size and occurred in low abundance only, the increase in total oncaeid density and/or plankton biomass was less conspicuous. Dominant Oncaea species in the bathypelagic zone were O. longipes and O.brodskii. The results are compared with published data from the Arabian Sea and other tropical oceanic areas with and without an extreme mesopelagic oxygen minimum zone. Possible causes of the intermediate abundance maxima within the oxygen deficiency zone are discussed.