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首页> 外文期刊>Marine biology >Spatio-temporal changes in diversity and community structure of planktonic copepods in Sagami Bay, Japan
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Spatio-temporal changes in diversity and community structure of planktonic copepods in Sagami Bay, Japan

机译：日本相模湾浮游co足类动物多样性和群落结构的时空变化

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摘要

Seasonal changes in diversity and community structure of planktonic copepods at a shelf site in Sagami Bay, Japan was studied in relation to cross-shelf interaction of species components. Seasonal mesozoo-plankton samples were collected from the shelf station (St. M) of the north-west part of Sagami Bay from 1995 to 1997. Vertical multi-layered samples were collected near the center of Sagami Bay (St. P) in June 1996. A total 185 copepod species were identified from the two stations. We observed a clear seasonal succession in calanoid diversity and community structure at St. M from a simple shelf water community (> 11 species) during spring blooming periods to highly diverse and mixed communities (ca 20-30 species) of shelf water species coupled with various Kuroshio Current species during late summer to autumn. Cluster and non-metric multidimensional scaling ordination analyses showed two distinct calanoid community groups. One group, which included samples of St. M and the surface layer of St. P, consisted of shelf water species, such as Calanus sinicus, Ctenocalanus vanus, Paracalanus spp., and Kuroshio species, such as, Canthocalanus pauper, Scoleci-thrix danae, etc. The other cluster was restricted to the samples collected from mid and deep layers at St. P, which consisted of meso- and bathypelagic species and Oyashio species (cold-current species, such as Neocal-anus cristatus, Pseudocalanus spp., Eucalanus bungii and Metridia pacifica). In the mid and deep layers at St. P, the population of dormant copepodid stage V (CV) of Eucalanus californicus and C. sinicus were dominant. The deep CV population of C. sinicus might be ecologically discriminated from the surface and shelf water population due to their larger body length and dormant life cycle. E. californicus was also collected at the shelf site during each spring bloom period, whereas the population might descend into the mid- and deep-layers of the central bay before summer. Our results suggest that the seasonal fluctuation of community structure in the shelf water was controlled by both physical (Kuroshio Current) and biological factors, i.e., spring bloom and ontogenetic vertical migration of E. californicus. In particular, transport and diffusion processes of Kuroshio Current in Sagami Bay played a key role in controlling the shelf water calanoid community.
机译：研究了日本相模湾一个架子上浮游a足类动物多样性和群落结构的季节性变化与物种组成的跨架相互作用的关系。从1995年至1997年从相模湾西北部的陆架（St. M）收集季节性中层浮游生物样品。6月，在相模湾（St. P）中心附近收集了垂直的多层样品。 1996年，从两个站共鉴定出185种co足类物种。我们观察到St.M的花序动物多样性和群落结构有明显的季节性演替，从春季开花期的简单陆架水群落（> 11种）到陆架水种的高度多样性和混合群落（约20-30种），再加上夏末至秋季的各种黑潮当前物种。聚类和非度量多维标度排序分析显示了两个不同的类颅动物群落组。一组包括圣M的样品和圣P的表层的样品，由架子水物种（例如Calanus sinicus，Ctenocalanus vanus，Paracalanus spp。）和黑潮物种（如Canthocalanus pauper，Scoleci-thrix）组成另一个簇仅限于从圣帕特里克州中层和深层收集的样品，其中包括中上层和深层物种和Oyashio物种（冷流物种，如Neocal-anus cristatus，Pseudocalanus spp。 ，桉树（Eucalanus bungii）和太平洋（Metridia pacifica）。在St.P的中层和深层，占主导地位的是加州桉（Eucalanus californicus）和中华梭状芽胞杆菌（C. sinicus）的休眠同足四期阶段（CV）。由于其较长的体长和休眠的生命周期，深部的C. sinicus CV种群可能会在生态上与地表水和架子水种群区分开。在每个春季开花期，也都在架子位置收集了加州E. californicus，而种群可能在夏季之前下降到中央海湾的中层和深层。我们的研究结果表明，架子水群落结构的季节性波动受物理（黑潮）和生物学因素的控制，即春季开花和加州E.californicus的自生垂直迁移。特别是相模湾黑潮潮流的运输和扩散过程在控制陆架水cal兰群落中起着关键作用。

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