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Characteristics and regional classification of the copepod community in Ariake Bay with note on comparison with 3 decades ago

机译：有明湾the足类群落的特征和区域分类，以及与3年前的比较

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Ariake Bay, Kyushu Island, has recently exhibited environmental degradation in the form of red tides and anoxic bottom water. To determine the characteristics and regional classification of the copepod community, zooplankton surveys were made throughout the bay in three cruises each in October 2004, January 2005 and March 2009 by vertical tows of a 0.1-mm-mesh plankton net. Oithona davisae was the most abundant in January and March, and Microsetella norvegica in October. Cluster analysis revealed that the copepod community from each cruise was generally separated into the inner to eastern-middle region and the western-middle to mouth region. A SIMPER analysis revealed that dissimilarity between the groups and similarity within each group were mainly due to the dominant species, but the similarities within the outer-region group in January and March were mostly contributed by Paracalanus parvus s.l. A non-metric multidimensional scaling with bubble plots of environmental variables and a BIOENV analysis showed that transparency was more different between the two groups than temperature and salinity. As compared with two similarly sized, eutrophic bays (Tokyo and Osaka Bays), Ariake Bay differs from Tokyo Bay in the dominance of M. norvegica and from Osaka Bay in the high abundance of O. davisae even in the colder season. The dominant species and the regional classification of the copepod community in the bay were similar to those in the studies in the 1970s, suggesting that the copepod community has not notably changed during the last 3 decades.
机译：九州岛有明湾最近以赤潮和缺氧地下水的形式出现了环境恶化。为了确定co足类群落的特征和区域分类，在2004年10月，2005年1月和2009年3月，分别通过垂直拖曳的0.1毫米网眼浮游生物网在三个海湾进行了浮游动物调查。 1月和3月，戴维斯戴维森（Oithona davisae）最为丰富，而10月则是挪威小雪蛤（Microsetella norvegica）。聚类分析表明，每次巡游中的pe足类群落通常被分为内中东部地区和中西部至嘴地区。 SIMPER分析表明，各组之间的差异和各组之间的相似性主要是由于优势种引起的，但1月和3月外围区域组内的相似性主要是由Paracalanus parvus s.l造成的。带有环境变量气泡图的非度量多维标度和BIOENV分析表明，两组之间的透明度比温度和盐度更大。与两个大小相似的富营养化海湾（东京湾和大阪湾）相比，有明湾与东京湾在诺维奇米卡藻中占主导地位，而大阪湾则在戴维沙门氏菌丰富的地区（甚至在寒冷季节）有所不同。海湾中co足动物群落的优势种和区域分类与1970年代的研究相似，这表明community足动物群落在过去的30年中没有显着变化。

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