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Relations between environmental gradients and diversity indices of benthicinvertebrates in lotic systems of northern Italy

机译：意大利北部抽烟系统中环境梯度与底栖脊椎动物的多样性指数之间的关系

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摘要

The relations between environmental gradients, as measured by 19 independentvariables, and traditional diversity indices (taxonomic richness, diversityand evenness) of benthic macroinvertebrate communities in the lotic systemsof northern Italy were analyzed. Redundancy analysis?(RDA) was used todescribe the response of taxa to environmental gradients. Diversity indiceswere analyzed using generalized linear models?(GLMs) with explanatoryvariables the first two major RDA axes. The results from RDA showed that taxavariance is mostly explained by altitude/latitude and combined pollutiongradients. Taxonomic richness and diversity was higher in the low pollutedupland sites?(LPUs) in comparison to high polluted lowland sites?(HPLs),suggesting that headwater streams have higher taxonomic richness thandownstream reaches. On the other hand, evenness was lower in LPUs, probablydue to the dominance of some taxa (e.g., Plecoptera) that are more tolerantof colder conditions.
机译：分析了由意大利19个独立变量测得的环境梯度与意大利北部抽水系统底栖大型无脊椎动物群落的传统多样性指数（分类学丰富度，多样性和均匀度）之间的关系。冗余分析（RDA）用于描述分类单元对环境梯度的响应。使用广义线性模型（GLM）分析多样性指数，并在前两个主要RDA轴上加上解释性变量。 RDA的结果表明，分类差异主要由海拔/纬度和综合污染梯度解释。与高污染的低地站点（HPL）相比，低污染的高地站点（LPU）的分类学丰富度和多样性更高，这表明源头水流比下游的上游具有更高的分类学丰富度。另一方面，LPU的均匀性较低，这可能是由于某些较宽容的分类单元（例如，鞘翅目）的优势。

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