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首页> 外文期刊>Estuarine Coastal and Shelf Science >Changes In Zooplankton Diversity And Distribution Pattern Under Varying Precipitation Regimes In A Southern Temperate Estuary
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Changes In Zooplankton Diversity And Distribution Pattern Under Varying Precipitation Regimes In A Southern Temperate Estuary

机译：南方温带河口不同降水条件下浮游动物多样性和分布格局的变化

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摘要

The influence of climate variability on the diversity and distribution patterns of zooplankton communities was investigated in the Mondego estuary (Portugal) during four consecutive years characterized by highly variable precipitation and, consequently, river flow regime. Monthly samples were collected along the estuarine gradient at five sampling stations. Seasonal, inter-annual and spatial distributions were evaluated by multivariate analyses and three diversity indices were applied (Species number, Shannon Diversity and Average Taxonomic Distinctness). A two-year drought period presented significant differences in salinity values, especially in 2005 (extreme drought event). During the study period, copepoda was the main dominant group and Acartia tonsa the most abundant species, with the exception of autumn 2006, where high abundances of the cladoceran Penilia avirostris were noticed. Multivariate analysis indicated that zooplankton communities changed from a pre- to a post-drought period indicating the influence of hydrological parameters in communities' structure. The dry period was associated with an increase in zooplankton density, a reduction in seasonality and higher abundance and prevalence of marine species throughout the year. Seasonally, winter/spring communities were distinct from those in summer/autumn. Spatially, salinity-associated differences between upstream and downstream communities were reduced during the drought years, but during the post-drought year, these differences were detected again.
机译：在连续4年的Mondego河口（葡萄牙）调查了气候变化对浮游动物群落多样性和分布模式的影响，其特征是降水变化很大，因此河流流量变化很大。在五个采样站沿河口梯度采集每月样本。通过多元分析评估季节，年际和空间分布，并应用三个多样性指数（物种数，香农多样性和平均分类学区别度）。两年的干旱期盐度值存在显着差异，尤其是在2005年（极端干旱事件）。在研究期间，copepoda是主要的优势种群，而Acartiatonsa是最丰富的物种，但2006年秋季除外，那里发现了锁骨青霉的高丰度。多变量分析表明，浮游动物群落从干旱前期变为干旱后期，表明水文参数对群落结构的影响。干旱时期与浮游动物密度的增加，季节的减少以及全年海洋物种的丰度和盛行率有关。季节性上，冬季/春季社区与夏季/秋季社区不同。在空间上，干旱年减少了上游社区和下游社区之间与盐度相关的差异，但在干旱后的一年中，这些差异再次被发现。

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