Temporal variability and community composition of zooplankton at station L4 in the Western Channel: 20 years of sampling
Temporal variability and community composition of zooplankton at station L4 in the Western Channel: 20 years of sampling
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DOI：
10.1093/plankt/fbq009
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发表时间：
2010-05-01
影响因子：
2.1
通讯作者：
Bonnet, Delphine
中科院分区：
文献类型：
--
作者：
Eloire, Damien;Somerfield, Paul J.;Bonnet, Delphine
浮游动物群落组成和多样性进行了分析，1988-2007年期间在沿海站L4普利茅斯在西部海峡。浮游动物总量的季节变化具有双峰特征。浮游动物总丰度没有表现出任何长期趋势，其年际变化与环境条件的变化没有直接关系。然而，观察到浮游动物总丰度的不同时期的变化，似乎始终与海表温度（SST）和风的变化有关。占浮游动物总丰度80-90%的22个类群的数量在20年中是一致的，它们对群落的累积贡献只有很小的年际变化。桡足类群落的物种丰富度呈显著的长期增长趋势，其最大年值与年平均SST显著相关。有长期变化的证据：Oncaea属的数量，卷足类幼虫、长角哲水蚤和毛颚类的数量有所增加，而长形伪哲水蚤、长角特水蚤、克氏纺锤水蚤、诺氏滑水蚤、附足类、足水蚤的数量有所增加。和帆状栉哲水蚤的数量有所减少。利用指示种监测水文气候变化的西海峡进行了讨论。
Zooplankton community composition and diversity have been analysed for the period 1988-2007 at the coastal station L4 off Plymouth in the Western Channel. The seasonal cycle of the total zooplankton was characterized by two peaks. The total zooplankton abundance did not show any long-term trend and its interannual variations were not directly related to changes in environmental conditions. However, different periods of change in total zooplankton abundance were observed that appeared to be consistently related to changes in sea surface temperature (SST) and wind. The number of taxa (22) contributing 80-90% of the total zooplankton abundance was consistent over the 20 years and their cumulative contribution to the community showed only small interannual variations. A significant long-term increase in species richness of the copepod community was detected and its maximum annual value was significantly related to annual average SST. There was evidence of long-term changes: numbers of Oncaea spp., Cirripede larvae, Calanus helgolandicus and Chaetognaths have increased, whereas numbers of Pseudocalanus elongatus, Temora longicornis, Acartia clausi, Evadne nordmanni, Appendicularians, Podon spp. and Ctenocalanus vanus have decreased. The use of indicator species to monitor hydroclimatic changes in the Western Channel is discussed.