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首页> 外文期刊>Hydrobiologia >Changes in epilithic biomasses and invertebrate community structure over a deposit metal concentration gradient in upland headwater streams
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Changes in epilithic biomasses and invertebrate community structure over a deposit metal concentration gradient in upland headwater streams

机译：上游源头水流沉积金属浓度梯度上表层生物量和无脊椎动物群落结构的变化

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摘要

Stream bed metal deposits affect the taxon richness, density and taxonomic diversity of primary and secondary producers by a variety of direct or indirect abiotic and biotic processes but little is known about the relative importance of these processes over a deposit metal concentration gradient. Inorganic matter (IM), algal and non-photosynthetic detrital (NPD) dry biomasses were estimated for 10 monthly samples, between 2007 and 2008, from eight sites differing in deposit density. Invertebrate abundance, taxon richness and composition were also determined. Relations between these variables were investigated by canonical correspondence analysis (CCA), generalized estimating equation models and path analysis. The first CCA axis correlates with deposit density and invertebrate abundance, with lumbriculids and chironomids increasing in abundance with deposit density and all other taxa declining. Community structure changes significantly above a deposit density of approximately 8 mg cm−2, when algal biomass, invertebrate richness and diversity decline. Invertebrate richness and diversity were determined by direct effects of NPD biomass and indirect effects of IM. Algal biomass only had an effect on invertebrate abundance. Possible pH, oxygen, food and ecotoxicological effects of NPD biomass on the biota are discussed.
机译：流化床金属沉积物通过各种直接或间接的非生物和生物过程影响一级和二级生产者的分类单元丰富度，密度和分类学多样性，但对于这些过程相对于沉积物金属浓度梯度的相对重要性知之甚少。在2007年至2008年之间，从八个矿床密度不同的地点，对10个月度样品估算了无机物（IM），藻类和非光合碎屑（NPD）干燥生物量。还确定了无脊椎动物的丰度，分类单元的丰富度和组成。通过规范对应分析（CCA），广义估计方程模型和路径分析研究了这些变量之间的关系。第一个CCA轴与沉积物密度和无脊椎动物的丰度相关，随着生矿密度和所有其他类群的减少，小鳞片和鳞茎纲的丰度增加。当藻类生物量，无脊椎动物的丰富度和多样性下降时，群落结构会在约8 mg·cm-2的沉积密度以上发生显着变化。无脊椎动物的丰富度和多样性是由NPD生物量的直接作用和IM的间接作用决定的。藻类生物量仅对无脊椎动物的丰度有影响。讨论了NPD生物量可能对生物群的pH，氧气，食物和生态毒理作用。

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