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Rotifers in the Schelde estuary (Belgium): a test of taxonomic relevance

机译：舍尔德河口（比利时）的轮虫：分类相关性的测试

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摘要

To investigate the reaction of the zooplankton community to improving water quality in the Schelde estuary, we studied the relationship between rotifer species distribution and environmental factors, and the feasibility of using a coarser level of taxonomic resolution. Fifty-two taxa, belonging to 26 genera, were identified, including 22 taxa new for the Schelde. Brachionus calyciflorus, Keratella cochlearis and B. angularis were the most abundant species. The highest diversity and abundances were observed in the freshwater reach. Redundancy analyses (RDA) showed that the main environmental factors explaining rotifer distribution were chlorinity and seasonal factors (discharge levels, cyclopoid abundance). Analysis carried out with data at the species and the genus level gave similar ordination plots, but the positioning of a genus relative to environmental factors did not always adequately represent the associations between the various species within the genus and environmental factors. Similar patterns in space and time were observed using taxonomic richness and diversity indices for analyses at species or genus level. Thus, in the context of the restoration of the Schelde estuary, the identification of rotifer species is very informative, but not essential for detecting important ecological associations.
机译：为了研究Schelde河口浮游动物群落对改善水质的反应，我们研究了轮虫种类分布与环境因素之间的关系，以及使用较粗分类分类法的可行性。确定了属于26属的52个分类单元，包括Schelde新增的22个分类单元。花椰菜Brachionus calyciflorus，Keratella cochlearis和B. angularis是最丰富的物种。在淡水河段观察到最高的多样性和丰度。冗余分析（RDA）显示，解释轮虫分布的主要环境因素是氯和季节因素（排放水平，摆线菌的丰度）。使用物种和属水平上的数据进行的分析给出了相似的排序图，但是相对于环境因素的属的定位并不总是能充分代表属内各种物种与环境因素之间的关联。使用分类学丰富度和多样性指数在物种或属水平上进行分析时，观察到了类似的时空格局。因此，在恢复Schelde河口的背景下，轮虫种类的鉴定非常有用，但对于检测重要的生态学联系并不是必不可少的。

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