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首页> 外文期刊>Hydrobiologia >Across-reach consistency in macroinvertebrate distributions among litter patch types in Japanese headwater streams
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Across-reach consistency in macroinvertebrate distributions among litter patch types in Japanese headwater streams

机译：日本上游水域凋落斑块类型中大型无脊椎动物分布的跨界一致性

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Different types of litter patches with contrasting macroinvertebrate assemblages have been observed within a stream reach. This study examined whether distributions of macroinvertebrates among three litter patch types (riffle, middle, edge) were consistent between reaches with different channel characteristics in headwater streams in central Japan. Mass of leaves per unit area was significantly higher in riffle and edge patches than in middle patches, which was consistent between reaches, while no consistent pattern was evident between reaches for mass of either woody material or small litter fragments. Distribution among the patch types was consistent between reaches for 11 out of 13 dominant macroinvertebrate taxa; density was highest in riffle patches for 5 taxa and in middle patches for 5 taxa. Although we previously related densities of some taxa to mass of woody material or small litter fragments, hydraulic characteristics (water depth, current velocity), which were consistent between reaches, may be more important determinants of macroinvertebrate distributions among the patch types, even within pools (i.e. middle and edge patches) where current is uniformly low. The results of this study indicate that a reach-scale macroinvertebrate community structure associated with litter is likely to vary according to litter patch type composition, which would be affected by channel characteristics of the reaches.
机译：在河段范围内观察到了不同类型的大无脊椎动物组成的垫料斑块。这项研究调查了日本中部源流中具有不同河道特征的河段之间三种垫料类型（浅滩，中层，边缘）之间大型无脊椎动物的分布是否一致。在浅滩和边缘斑块中，每单位面积的叶子质量明显高于中部斑块，这在河段之间是一致的，而对于木料或小垃圾碎片的质量，在河道之间没有明显的规律。斑块类型之间的分布在13个优势大型无脊椎动物类群中有11个达到了一致。密度最高的是5个分类单元的浅滩斑块和5个分类单元的中间斑块。尽管我们以前将某些分类单元的密度与木质材料或小垃圾碎片的质量相关联，但是水力特征（水深，水流速度）在河段之间是一致的，即使在水池中，也可能是斑块类型中大型无脊椎动物分布的重要决定因素。 （即中间和边缘斑块），其中电流始终较低。这项研究的结果表明，与垫料相关的可达规模的大型无脊椎动物群落结构可能会根据垫料类型的组成而变化，这可能会受到其河道特征的影响。

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