Epipelagic mesozooplankton distribution and abundance over the Mascarene Plateau and Basin, south-western Indian Ocean
Epipelagic mesozooplankton distribution and abundance over the Mascarene Plateau and Basin, south-western Indian Ocean
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DOI：
10.1017/s0025315404008835h
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发表时间：
2004-02-01
影响因子：
1.2
通讯作者：
Meunier, S
中科院分区：
文献类型：
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作者：
Gallienne, CP;Conway, DVP;Meunier, S
新月形的马斯克林高原（印度洋西南部），长约2200千米，对南赤道流（主要向西）形成了部分屏障。马斯克林高原的浅水地区实际上形成了一个没有所有相关海岸线的大陆架海。通过对高原和西部盆地的浮游动物取样样带，探讨了水流部分中断对该地区浮游动物生物量和群落结构的影响。光学浮游生物计数器（OPC）的生物量数据和分类分析的群落结构变异性表明，高原的阻碍导致下游上升流、养分富集和叶绿素和次生产物水平的提高。从浮游动物生物量的大小分布和群落结构上看，马斯克林盆地与海脊本身以及南北水域都有明显的区别。卫星遥感数据，特别是遥感海洋彩色图像和海面高度异常（SSHA），表明支持这种影响。OPC和SSHA与海表温度（SST）之间存在一定的相关关系，这可能反映了驱动该海域中浮游动物变化的物理过程。远离脊影响的生物量值平均为24mg - m(-3)，而脊下游的生物量平均为263 mg - m（-3）。桡足类占平均总数的60%。不同区域间角足类桡足类的数量差异较大，远离高原影响的角足类桡足类的数量最少，角足类、角足类、角足类和角足类的数量较多。
The crescent shaped Mascarene Plateau (south-western Indian Ocean), some, 2200 kill in length, forms a partial barrier to the (predominantly westward) flow of the South Equatorial Current. Shallow areas of the Mascarene Plateau effectively form a large shelf sea without all associated coastline. Zooplankton sampling transects were made across the plateau and also the basin to the west, to investigate the role the partial interruption of flow has on zooplankton biomass and community structure over the region. Biomass data from optical plankton counter (OPC) analysis and variability in commuinity structure from taxonomic analysis, appear to indicate that the obstruction by the plateau causes upwelling, nutrient enrichment and enhanced chlorophyll and secondary production levels downstream.The Mascarene Basin is clearly, distinguishable from the ridge itself and from the waters to the south and north, both in terms of size-distributed zooplankton biomass and commuinity structure. Satellite remote sensing data, particularly remotely-sensed ocean colour imagery and the sea surface height anomaly (SSHA),, Indicate support for this effect. A correlation was found between OPC and SSHA and sea surface temperature (SST), which may indicate the physical processes, driving mesozooplankton variability in this area. Biomass values away from the influence of the ridge averaged 24mg m(-3) but downstream of the ridge biomass averaged 263 mg mg(-3). Copepods comprised 60% of the mean total organisms. Calanoid copepod numbers varied considerably between regions, being, lowest away from the influence of the plateau higher numbers of the cyclopoid copepods Oithona spp., Coryaeus spp. and Oncaea spp. and the harpacticoid Microsetella spp. were found.