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Colonization of leaf patches at topographically different locations by insect shredders in a small mountain stream

机译：在一条小山ders中，昆虫碎纸机在地形不同的位置定殖叶斑

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We examined physical constraints on the colonization of leaf patches by shredder individuals by comparing the colonizations of artificially standardized leaf patches placed at different locations within a stream reach (i.e., riffles, middles and edges of pools). Stonefly taxa (Nemoura, Protonemura) colonized riffle patches 2-10 times more often than pool (middle, edge) patches, whereas caddisfly taxa (two species of Lepidostoma, Nothopsyche) almost exclusively colonized pool patches. Colonization also differed between the middle and edge patches in pools for most taxa; it was 2-5 times greater in edge patches for Nemoura and in middle patches for Lepidostoma. The abilities of species to cope with low oxygen circulation and high shear stress appear to determine differences in colonization between riffle and pool patches, whereas species-specific dispersion behavior (e.g., return time from drift) may differentiate colonization between middle and edge patches in pools. Our results suggest that changes in leaf distribution within a reach can affect the suitability of stream reaches in terms of food acquisition for shredder individuals.
机译：我们通过比较人工标准化叶子斑块的定殖情况来研究切碎者对叶子斑块定殖的物理限制，方法是将人工标准化叶子斑块定植在河段的不同位置（即浅滩，水池的中部和边缘）。石蝇类群（Nemoura，Protonemura）定居的浅滩斑块的数量比池（中，边缘）斑块高2-10倍，而石蛾类群（鳞翅目的两种，Nothopsyche）几乎完全定居于池斑。对于大多数类群，池中和边缘斑块之间的定殖也有所不同。 Nemoura的边缘斑块和鳞状上皮瘤的中间斑块要大2-5倍。物种应对低氧循环和高剪切应力的能力似乎决定了浅滩和水池斑块之间定居的差异，而特定物种的分散行为（例如，漂移的返回时间）可能区分水池中间和边缘斑块之间的定居。我们的结果表明，在触角范围内叶片分布的变化会影响到触角触角在切碎个体获得食物方面的适用性。

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