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首页> 外文期刊>Limnology >Peculiar hyporheic habitat of some Rhyacophila species (Trichoptera; Rhyacophilidae) in Japanese mountain streams
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Peculiar hyporheic habitat of some Rhyacophila species (Trichoptera; Rhyacophilidae) in Japanese mountain streams

机译：日本山区溪流中某些Rhyacophila种类（Trichoptera; Rhyacophilidae）的奇特的低栖生境

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摘要

We investigated the distribution patterns of Rhyacophila larvae at 2 habitat scales in mountain streams in central Honshu. One was at a rapid glide within a stream reach and the other was in microvertical layers within each rapid and glide. Cobbles were predominant in rapids, whereas sand and gravels were predominant in glides. Mean sediment particle size was smaller in glides, but evenness of sediment size and porosity were greater. A total of 9 species of Rhyacophila larvae were collected from rapids. On the other hand, in glides, only 4 species, R. nipponica, R. shikotsuensis, R. kawamurae, and R. transquilla, were collected, but they were more abundant than in rapids. The larvae of R. transquilla were found mainly in upper layers of the stream bed, whereas the other 3 species, R. nipponica, R. shikotsuensis, and R. kawamurae, occurred both in upper and lower layers. The latter 3 species belong to R. nigrocephala species group, the larvae of which share several common morphological and behavioral characters adapted to hyporheic habitat, such as slender body shape and vermicular movement. It is suggested that higher porosity in glides provides more microhabitat for them, and small-sized sediment particles are appropriate for their burrowing and creeping movement in hyporheic habitat.
机译：我们调查了本州中部山区河流中2种生境规模上的Rhyacophila幼虫的分布模式。一个是在河段内快速滑行，另一个是在每个快速和滑行内的微垂直层内。急流中以鹅卵石为主，而滑行则以沙子和砾石为主。滑坡中的平均沉积物粒径较小，但沉积物粒径和孔隙度的均匀性较大。从急流中总共收集了9种Rhyacophila幼虫。另一方面，在滑行中，仅收集到了4种，即R. nipponica，R。shikotsuensis，R。kawamurae和R. transquilla，但它们比急流中的丰富。 Transquilla的幼虫主要存在于河床的上层，而其他3种R. nipponica，R。shikotsuensis和R. kawamurae则分别出现在上层和下层。后3个种属于黑头草（R. nigrocephala）种群，其幼虫具有适应于流线型栖息地的几种常见的形态和行为特征，例如细长的体型和蠕虫运动。有人认为，滑坡中较高的孔隙度为它们提供了更多的微生境，而较小的沉积物颗粒则适合于在流变生境中的穴居和蠕动运动。

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