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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatial distribution and assemblage structure of macrobenthic invertebrates in a brackish lake in relation to environmental variables
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Spatial distribution and assemblage structure of macrobenthic invertebrates in a brackish lake in relation to environmental variables

机译：咸水湖中大型底栖无脊椎动物的空间分布和聚集结构与环境变量的关系

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The distribution of organisms relative to their habitat is of central importance to ecology. The nature of this distribution provides an initial insight into the types of ecological processes that regulate populations and assemblages. Estuaries provide diverse habitats in terms of spatial heterogeneity in physical and chemical conditions. The purpose of the present study is to determine the assemblage structure and the spatial distribution of macrobenthic invertebrates in relation to environmental variables in a brackish lake, Lake Hinuma, in Japan. Thirty-seven sites in the lake were selected to cover the entire area of the lake along gradients for water depth, salinity and median grain size of sediment. A total of 23 species and five higher taxa groups were found. In terms of total individuals, Corbicula japonica, Prionospio japonica, Notomustus sp. and Einfeldia sp. were the most abundant species. The results of cluster analysis and canonical correspondence analysis using 14 dominant species revealed that median grain size and salinity have significant effects on the spatial distribution of 11 macrobenthic species. That is, the two species C. japonica and P. japonica were found at sites with larger grain size and higher salinity, the six species Gradidierella japonica, Assiminea lutea japonica, Tylorrhynchus heterochaetus, Cyathura sp., Melita sp. and Potamilla sp. were found at sites with smaller grain size and higher salinity, the one species Einfeldia sp. was found at sites with larger grain size and lower salinity, and the two species Polypedilum sp. and Notomustus sp. were found at sites with smaller grain size and lower salinity. The results demonstrated significant differences in macrobenthic assemblage structures along environmental gradients in a brackish lake.
机译：生物相对于其栖息地的分布对生态至关重要。这种分布的性质提供了对调节种群和种群的生态过程类型的初步了解。在物理和化学条件下，河口提供了多样化的栖息地。本研究的目的是确定在日本咸沼湖咸淡湖中大型底栖无脊椎动物的组装结构和空间分布与环境变量的关系。选择了湖中的37个地点，沿着水深，盐度和沉积物中值粒径的梯度覆盖了湖的整个区域。共发现23种和5个较高的分类群。就总个体而言，Corbicula japonica，Prionospio japonica，Notomustus sp。和Einfeldia sp。是最丰富的物种。使用14种优势种的聚类分析和规范对应分析的结果表明，中值粒径和盐度对11种大型底栖动物的空间分布有显着影响。即，在较大的粒度和较高的盐度的地点发现了两个C. japonica和P. japonica，六个种类为Gradidierella japonica，Assiminea lutea japonica，Tylorrhynchus heterochaetus，Cyathura sp。，Melita sp。和Potamilla sp。被发现在具有较小粒度和较高盐度的地点，一种是Einfeldia sp。被发现在具有较大粒度和较低盐度的地点，并且两个物种Polypedilum sp。和Notomustus sp。在较小晶粒度和较低盐度的地点发现。结果表明，咸淡湖中大型底栖动物组合结构沿环境梯度存在显着差异。

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