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首页> 外文期刊>International review of hydrobiology >Spatial distribution and coexistence patterns of caddisfly larvae (Trichoptera) in a Hungarian stream
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Spatial distribution and coexistence patterns of caddisfly larvae (Trichoptera) in a Hungarian stream

机译：匈牙利河流中dis蝇幼虫的空间分布和共存模式

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摘要

It is well known that stream macroinvertebrates usually show aggregated spatial distributions caused by extrinsic factors and interactions among species and individuals. In the present study, the spatial distribution of caddisfly assemblages and coexistence patterns of larval caddisfly species (Insecta: Trichoptera) were measured in a Hungarian stream reach at three different spatial scales.Caddisfly assemblages showed aggregated, random and regular distributions as measured by the variance-mean relationship of species richness as sampling area increased from 0.0225 m(2) to 0.2025 m(2). The observed coexistence patterns indicated interactions (lower diversity of unique species combinations than expected by chance) among species for aggregated distributions. These interactions among species proved to be positive associations particularly among species belonging to the same functional feeding group.The positive associations and the aggregated distribution of caddisflies supported the hypothesis that microhabitat patches (patchy microhabitat-macroinvertebrate model) and/or positive biological interactions among species using the same resource (hypothesis of facilitation) have a deterministic effect on the spatial distribution of caddisfly assemblages.
机译：众所周知，大型无脊椎动物通常表现出由外在因素以及物种与个体之间的相互作用引起的聚集空间分布。在本研究中，以三种不同的空间尺度在匈牙利河水域中测量了dis蝇组合的空间分布和幼虫蝇（共生昆虫）的共存模式，并通过方差测量了ad蝇组合的聚集，随机和规则分布。物种丰富度随采样面积的平均关系从0.0225 m（2）增加到0.2025 m（2）。观察到的共存模式表明物种之间的相互作用（独特物种组合的多样性低于偶然性所期望的），以实现总体分布。物种之间的这些相互作用被证明是正向关联，尤其是在属于同一功能性饲喂组的物种之间。正向关联和镉的聚集分布支持以下假设：物种的微生境斑块（斑块状微生境-无脊椎动物模型）和/或物种间的正向生物相互作用。使用相同的资源（便利化假设）对caddisfly组合的空间分布具有确定性的影响。

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