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首页> 外文期刊>Limnology >Benthic macro- and meso-invertebrates of a sandy riverbed in a mountain stream, central Japan
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Benthic macro- and meso-invertebrates of a sandy riverbed in a mountain stream, central Japan

机译：日本中部山区河流沙质河床的底栖大型和中型无脊椎动物

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Quantitative samples of benthic invertebrates were collected from a sandy riverbed of a mountainous stream (Kozu site of Takami-gawa stream, Nara Prefecture), central Japan by core samplers in five sampling occasions through the years 2008–2009. A total of 120 taxa were identified, representing 55 families and 97 genera. Insects formed about 92% of the total recorded taxa and 88% of individuals’ abundance. A total of 111 taxa of aquatic insects, belonging to 49 families and 92 genera, were identified and represented by ten orders. Oligochaeta and Acari were dominant non-insect invertebrates. Diptera was the most diverse insect group, followed by Trichoptera and Ephemeroptera. Dominant taxa were mesoinvertebrates, younger stages of macroinvertebrates, both of which predominantly inhabit the interstitial zone of a sandy riverbed. Both taxon richness and invertebrate abundance were higher in February 2009 and lower in April and August 2008. A few major invertebrate taxa demonstrated distinct seasonal trends; i.e. Nymphomyia alba, Rheosmittia, and Corynoneura were abundant in February 2009. Newly hatched larvae of Larcasia akagiae were abundant in May 2008. This study also demonstrated the effectiveness of core samplers to collect small-sized benthic fauna that inhabit the interstitial or hyporheic zone of the sandy riverbed.
机译：在2008-2009年期间，通过核心采样器从日本中部的山区河流（奈良县高见川溪的甲祖遗址）的沙质河床中采集了底栖无脊椎动物的定量样本。共确定了120个分类单元，代表55个家庭和97属。昆虫占记录的总分类单元的约92％，占个体丰度的88％。共确定了111个水生昆虫类群，分别属于49个科和92个属，并由十个科目代表。 Oligochaeta和Acari是主要的非昆虫无脊椎动物。双翅目是最多样化的昆虫类，其次是鳞翅目和and翅目。优势类群是中无脊椎动物，是较年轻的大型无脊椎动物，它们都主要栖息于沙质河床的间隙区域。 2009年2月的分类单元丰富度和无脊椎动物的丰度都增加了，而2008年4月和2008年8月则降低了。例如，2009年2月有大量白粉病菌，Rheosmittia和Corynoneura。2008年5月，新孵化的Larcasia akagiae幼虫大量。这项研究还证明了核心采样器收集居住在间质或小流域的小型底栖动物的有效性。沙质的河床。

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