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首页> 外文期刊>Journal of the North American Benthological Society >Macroinvertebrate distribution in relation to land use and water chemistry in New York City drinking-water-supply watersheds
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Macroinvertebrate distribution in relation to land use and water chemistry in New York City drinking-water-supply watersheds

机译：纽约市饮用水供应流域与土地利用和水化学有关的大型无脊椎动物分布

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Macroinvertebrate communities were examined in conjunction with landuse and water-chemistry variables at 60 sites in the NYC drinking-water-supply watersheds over a 3-y period. The watersheds are in 2 adjacent regions of New York State (east of Hudson River [EOH] and west of Hudson River [WOH]) that are geographically distinct and have unique macroinvertebrate communities. Nonforested land use at EOH sites was mostly urban (4 - 57%), whereas land use at sites in the rural WOH region was more agricultural (up to 26%) and forested (60 - 97%). Land use accounted for 47% of among-site variability in macroinvertebrate communities in the EOH region and was largely independent of geological effects. Land use accounted for 40% of among-site variability in macroinvertebrate communities in the WOH region but was correlated with underlying geology. Comparisons among 3 landuse scales emphasized the importance of watershed- and riparian-scale land use to macroinvertebrate communities in both regions. Multivariate and bivariate taxa-environment relationships in the EOH and WOH regions identified specific landuse and water-chemistry gradients and, in general, showed a continuum in conditions across the watersheds. WOH macroinvertebrate communities varied primarily with specific conductance, population density, and agricultural and urban land use, but communities were not classified as impaired along these gradients. EOH macroinvertebrate communities were associated with a wider range of watershed conditions than WOH communities. Conditions ranged from forested to urban, and distinctive communities were associated with point-source discharges, road density, and lake outlets. The severity of the impact gradient in the EOH region resulted in impaired macroinvertebrate communities with decreased total and Ephemeroptera, Plecoptera, and Trichoptera (EPT) taxon richness and increased densities of oligochaetes and chironomids.
机译：在3年的时间里，结合纽约市饮用水供应流域的60个地点对大型无脊椎动物群落以及土地利用和水化学变量进行了研究。分水岭位于纽约州的两个相邻区域（哈德逊河[EOH]以东和哈德逊河[WOH]以西），这些地区在地理上截然不同，并具有独特的大型无脊椎动物群落。 EOH场所的非森林土地使用大部分是城市地区（4-57％），而WOH农村地区的土地使用的农业则更多（达26％）和森林（60-97％）。在EOH地区，大型无脊椎动物群落中土地利用占站点间变异的47％，并且在很大程度上不受地质影响。在WOH地区，大型无脊椎动物群落中土地利用占站点间变异的40％，但与基础地质状况相关。在3种土地利用尺度上的比较强调了分水岭和河岸尺度的土地利用对这两个区域的无脊椎动物群落的重要性。 EOH和WOH地区的多变量和双变量分类-环境关系确定了特定的土地利用和水化学梯度，并且总体上显示了流域条件的连续性。 WOH大型无脊椎动物群落主要随电导率，人口密度以及农业和城市土地利用而变化，但是沿这些梯度并未将群落归类为受损。与WOH社区相比，EOH大型无脊椎动物社区与更广泛的分水岭条件相关。条件从森林到城市不等，独特的社区与点源排放，道路密度和湖泊出口有关。 EOH区域影响梯度的严重性导致大型无脊椎动物群落受损，其总体和星翅目，鞘翅目和毛鳞翅目（EPT）类群丰富度降低，而寡纲和鳞翅目动物密度增加。

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