Effect of Asian clam shells on aquatic fauna in an artificial ditch

Effect of Asian clam shells on aquatic fauna in an artificial ditch
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亚洲蛤壳对人工沟渠中水生动物的影响

DOI:
10.1007/s00027-022-00918-8
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发表时间:
2023
期刊:
影响因子:
2.4
通讯作者:
M
M
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Nakano;M

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淡水双壳类在河流和湖泊中都具有一系列的生态功能。然而,这些功能在人工沟渠中的作用尚未得到检验,人工沟渠是双壳类的主要栖息地之一。在穴居的双壳类中,亚洲文蛤属的贝壳在水下缓慢腐烂,经常占据天然河流和人工沟渠的底部。为此,在中隔水渠中进行了一项人工操作实验,以确定有无贝类的网箱中水生动物的丰度和群落组成的差异,并确定贝类的大小组成与动物群的关系。实验结束后,进行踢网取样,以确定沟中的动物。实验结果表明,有大小贝壳混合网箱的大型无脊椎动物物种丰富度高于无贝壳网箱。有壳网箱的大型无脊椎动物总数高于无壳网箱。然而,不同贝壳大小组成的处理之间,大型无脊椎动物的物种丰富度和总数量都没有显著差异。踢网采样揭示了大型无脊椎动物的存在,并在中层生态系统中发现了一种鱼类。这些结果表明,在混凝土衬砌结构简单的人工沟渠中,珊瑚贝类可能有助于保护大型无脊椎动物。
Freshwater bivalves perform a range of ecological functions in both rivers and lakes. However, the effects of these functions in artificial ditches, one of the main habitats for bivalves, have not yet been examined. Among the burrowing bivalves, the shells of the Asian clam, genusCorbicula, decay slowly underwater and often dominate the bottom of natural rivers and artificial ditches. Here, a manipulative experiment was performed in a mesocosm ditch to determine the differences in the abundance and community composition of aquatic fauna in cages with and withoutCorbiculashells and to identify the relationship between shell size composition and fauna. Following the experiment, kick net sampling was performed to identify the fauna in the ditch. The results of the experiment indicated that macroinvertebrate species richness was higher in cages with a mix of small and large shells than in those without shells. The total number of macroinvertebrates was higher in cages with shells than in those without shells. However, both the species richness and total number of macroinvertebrates did not significantly differ among the treatments with different shell size compositions. Kick net sampling revealed macroinvertebrate fauna and the presence of a fish species in the mesocosm. These results suggested thatCorbiculashells may be useful for the conservation of macroinvertebrates in artificial ditches with concrete-lined and simple structures.
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