Hydraulic microhabitats and the distribution of macroinvertebrate assemblages in riffles
Hydraulic microhabitats and the distribution of macroinvertebrate assemblages in riffles
复制标题
DOI：
10.1111/j.1365-2427.2004.01322.x
复制
发表时间：
2005-02
影响因子：
2.7
通讯作者：
A. Brooks;T. Haeusler;I. Reinfelds;Simon Williams
中科院分区：
文献类型：
--
作者：
A. Brooks;T. Haeusler;I. Reinfelds;Simon Williams
摘要1.水力条件对大型无脊椎动物群落的空间分布的影响进行了研究，在三个浅滩在澳大利亚的常年河流。2.速度，深度和变化的基板粗糙度进行了测量，在每个56个大型无脊椎动物采样位置。复杂的水力学变量（粗糙度雷诺数，剪切速度，弗劳德数）计算从两个或三个直接测量的变量的组合。直接测量和复杂的水力变量的生物学意义，确定了一个单变量和多变量的统计程序相结合。3.大型无脊椎动物的丰度，类群和群落组成的数量显着不同的粗糙度雷诺数，弗劳德数，速度和剪切速度微生境在整个研究浅滩。4.回归分析表明，大型底栖动物丰度和类群数与粗糙度雷诺数、剪切速度、流速和弗劳德数呈负相关。深度与丰度呈负相关。在一般情况下，大多数的大型底栖动物群落喜欢的浅滩与最低的近床湍流的地区。5.粗糙度雷诺数解释了更多的无脊椎动物丰度的空间变化，类群和社区组成的数量比其他水力变量，无论是直接测量或计算。在直接测量的变量中，速度的解释力最大，略低于粗糙度雷诺数和剪切速度。6.这项研究表明，在水力条件下的速度，深度和基板粗糙度的组合所产生的小规模差异有一个重要的作用，在浅滩栖息地的大型无脊椎动物组合的空间分布。
SUMMARY 1. The influence of hydraulic conditions on the spatial distribution of macroinvertebrate assemblages was investigated in three riffles in a perennial Australian river. 2. Velocity, depth and variability of substrate roughness were measured at each of 56 macroinvertebrate sampling locations. Complex hydraulic variables (roughness Reynolds number, shear velocity, Froude number) were calculated from combinations of two or three of the directly measured variables. The biological significance of directly measured and complex hydraulic variables was determined by a combination of univariate and multivariate statistical procedures. 3. Macroinvertebrate abundance, number of taxa and community composition were significantly different between the identified roughness Reynolds number, Froude number, velocity and shear velocity microhabitats throughout the studied riffles. 4. Regression analysis showed macroinvertebrate abundance and number of taxa were negatively related to roughness Reynolds number, shear velocity, velocity and Froude number. Depth was negatively related to abundance. In general, the majority of the macroinvertebrate community preferred the areas of riffles with the lowest near-bed turbulence. 5. Roughness Reynolds number explained more of the spatial variation in invertebrate abundance, number of taxa and community composition than the other hydraulic variables, either directly measured or calculated. Of the directly measured variables, velocity had the greatest explanatory power, which was marginally less than roughness Reynolds number and shear velocity. 6. This study demonstrated that small-scale differences in hydraulic conditions created by combinations of velocity, depth and substrate roughness have an important role in the spatial distribution of macroinvertebrate assemblages in riffle habitats.