Zooplankton assemblages and biomass during a 4-period survey in a northern Mediterranean coastal lagoon.
Zooplankton assemblages and biomass during a 4-period survey in a northern Mediterranean coastal lagoon.
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DOI：
10.1016/s0043-1354(00)00243-8
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发表时间：
2001
期刊：
影响因子：
12.8
通讯作者：
T. Lam-Hoai;C. Rougier
中科院分区：
文献类型：
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作者：
T. Lam-Hoai;C. Rougier
作者建议在地中海西北部的一个沿海泻湖内(T和Z)和外(M)的三个站点检测浮游动物生物量。T站代表泻湖中心区，Z站位于贝类养殖区，而海滨站(M)作为海洋环境的参考。分析的目的是概述不同环境条件下的净浮游动物组合(分类结构和长度分布)，包括养殖活动。对环境变量的判别分析表明，温度、盐度和浮游植物主要反映在样本的空间格局中。对分类群生物量的排序表明，可能有助于浮游动物组合组织的两个主要因素：地理位置和热期。地理位置综合了强迫参数(生境、潮汐和风)下的泻湖-海水交换。热期既反映了种群的发育周期，又反映了环境的制约因素(温度、盐度、营养资源)。由此产生的影响出现在浮游动物在空间和时间上的结构化组合中。50μm间隔长度类群和类群数量从无耕作活动的海边和泻湖中心区减少到较浅的耕作区。但生物量-长度分布并不完全符合开放区域和受限区域之间的预期对立：在Z站观察到了更多的扩展剖面。生物量优势大小类别涉及到高达300xμm的范围。就生物量而言，这个大小类别似乎从海边或泻湖中心地区向农业区崩溃，与浮游动物全球生物量波动相似。生物量水平和生物量结构之间的差异表明，净浮游动物在一定程度上是大过滤生物的食物竞争对手，也是养殖贝类和相关附生动物的猎物。这一影响主要涉及微型浮游动物种群。
The authors proposed to examine zooplankton biomass at three stations inside (T and Z) and outside (M) a coastal lagoon of the north-western Mediterranean Sea. Station T represented the lagoon central area, and station Z was positioned in a shellfish farming sector, while the seaside station (M) served as a reference of marine environment. Analyses were designed to outline the net zooplankton assemblages (taxonomic structures and length distributions) in different environmental conditions, including the farming activity. A discriminant analysis of environmental variables determined that temperature, salinity and phytoplankton implied mainly in spatial pattern of the samples. An ordination of taxa biomasses showed two main factors which might contribute to the organisation of the zooplankton assemblages: the geographical position and the thermal period. The geographical position integrated the lagoon–sea water exchange under forcing parameters (habitat, tides and winds). The thermal period reflected both the populations development cycles and the environmental constraints (temperature, salinity, trophic resources). The resulting effects appeared in structured zooplankton assemblages in space and time. The number of 50 μm interval length classes and of taxa decreased from the seaside and the lagoon central area free of farming activity to the shallower farming zone. But the biomass-length distribution profiles did not closely follow such an expected opposition between opened and confined areas: more extended profiles were observed at station Z. Biomass dominant size classes concerned the range up to 300 μm. This size category appeared to collapse in terms of biomass from the seaside or central area of the lagoon towards the farming area, similarly to zooplankton global biomass fluctuations. Difference between biomass levels and between biomass structures suggested that net zooplankton partly acted as food competitors of macro-filtering organisms, and as preys for farming shellfish and associated epifauna. This impact mainly concerned microzooplankton populations.