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首页> 外文期刊>Journal of the American Water Resources Association >INFLUENCES OF WATERSHED URBANIZATION AND INSTREAM HABITAT ON MACROINVERTEBRATES IN COLD WATER STREAMS
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INFLUENCES OF WATERSHED URBANIZATION AND INSTREAM HABITAT ON MACROINVERTEBRATES IN COLD WATER STREAMS

机译：流域城市化和流域生境对冷水流域无脊椎动物的影响

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摘要

We analyzed data from riffle and snag habitats for 39 smail cold water streams with different levels of watershed urban-ization in Wisconsin and Minnesota to evaluate the influences of urban land use and instream habitat on macroinvertebrate commu-nities. Multivariate analysis indicated that stream temperature and amount of urban land use in the watersheds were the most influential factors determining macroinvertebrate assemblages. The amount of watershed urbanization was nonlinearly and nega-tively correlated with percentages of Ephemeroptera-Plecoptera-Trichoptera (EPT) abundance, EPT taxa, filterers, and scrapers and positively correlated with Hilsenhoff biotic index. High quality macroinvertebrate index values were possible if effective impervi-ousness was less than 7 percent of the watershed area. Beyond this level of imperviousness, index values tended to be consistently poor. Land uses in the riparian area were equal or more influential relative to land use elsewhere in the watershed, although riparian area consisted of only a small portion of the entire watershed area. Our study implies that it is extremely important to restrict watershed impervious land use and protect stream riparian areas for reducing human degradation on stream quality in low level urbanizing watersheds. Stream temperature may be one of the major factors through which human activities degrade cold-water streams, and management efforts that can maintain a natural thermal regime will help preserve stream quality.
机译：我们分析了来自威斯康星州和明尼苏达州不同分水岭城市化水平的39条冷水流的浅滩和断枝生境的数据，以评估城市土地利用和河流生境对大型无脊椎动物社区的影响。多因素分析表明，流域温度和流域内城市土地使用量是决定大型无脊椎动物群落的最主要因素。分水岭的城市化程度与表翅目，鞘翅目，-翅目（EPT）丰度，EPT类群，过滤器和刮板的百分比呈非线性和负相关，与Hilsenhoff生物指数呈正相关。如果有效不平整度小于流域面积的7％，则可以获得高质量的大型无脊椎动物指数值。除了这种不可渗透的程度之外，索引值往往一直很差。尽管河岸地区仅占整个流域面积的一小部分，但河岸地区的土地使用与流域其他地方的土地使用具有相同或更大的影响。我们的研究表明，限制流域不透水的土地利用并保护河流沿岸地区，以减少低水平城市化流域的河流水质下降对人类的退化至关重要。溪流温度可能是人类活动降解冷水溪流的主要因素之一，可以维持自然热力状况的管理工作将有助于保持溪流质量。

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