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首页> 外文期刊>Journal of the American Water Resources Association >EFFECTS OF RIPARIAN VEGETATION AND WATERSHED URBANIZATION ON FISHES IN STREAMS OF THE MID-ATLANTIC PIEDMONT (USA)
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EFFECTS OF RIPARIAN VEGETATION AND WATERSHED URBANIZATION ON FISHES IN STREAMS OF THE MID-ATLANTIC PIEDMONT (USA)

机译：日本中大西洋山麓河流上的植被和流域城市化对鱼类的影响

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摘要

The joint influences of riparian vegetation and urbanization on fish assemblages were analyzed by depletion sampling in paired forested and nonforested reaches of 25 small streams along an urbanization gradient. Nonforested reaches were narrower than their forested counterparts, so densities based on surface area differ from linear densities (based on reach length). Linear densities (based on number or biomass of fish) of American eel, white sucker and tesselated darter, and the proportion of biomass of benthic inverti-vores were significantly higher in nonforested reaches, while linear densities of margined madtom and the number of pool species were significantly higher in forested reaches. Observed riparian effects may reflect differences in habitat and algal productivity between forested and nonforested reaches. These results suggest that relatively small-scale riparian restoration projects can affect local geomorphology and the abundance of fish. Dense vegetative cover in riparian zones and similar or analogous habitats in both forested and nonforested reaches, the relatively small scale of the nonforested reaches, and the low statistical power to detect differences in abundance of rare species may have limited the observed differences between forested and nonforested reaches. There was a strong urbanization gradient, with reductions of intolerant species and increases of tolerant species and omnivores with increasing urbanization. Interactions between riparian vegetation type and urbanization were found for blacknose dace, creek chub, tesselated darter, and the proportion of biomass of lithophilic spawners. The study did not provide consistent support for the hypotheses that responses of fish to riparian vegetation would be overwhelmed by urban degradation or insignificant at low urbanization.
机译：通过沿城市化梯度对25条小溪的成林和非成林河段进行成对采样，分析了河岸植被和城市化对鱼类种群的联合影响。没有森林的河段比有森林的河段要窄，因此基于表面积的密度与线性密度（基于河段长度）不同。在非森林林中，美洲鳗鱼，白色吮吸者和花斑鱼的线密度（以鱼的数量或生物量为基础），底栖无脊椎动物的生物量比例显着较高，而边缘猕猴的线性密度和池种数量在森林覆盖的地区明显更高。观察到的河岸效应可能反映了森林覆盖区和非森林覆盖区之间生境和藻类生产力的差异。这些结果表明，相对较小规模的河岸恢复项目可能会影响当地的地貌和鱼类的数量。森林带和非森林带的河岸带和类似或类似栖息地的植被覆盖茂密，非森林带的规模相对较小，检测稀有物种丰富度差异的统计能力低，可能限制了观察到的森林带和非森林带之间的差异到达。城市化梯度很大，随着城市化程度的提高，不容忍物种的减少以及耐受物种和杂食性的增加。沿岸植被类型与城市化之间的相互作用被发现为黑鼻da，小河，镶嵌花状飞镖和嗜石产卵生物量的比例。该研究没有为以下假设提供一致的支持：鱼对河岸植被的反应将因城市退化或在城市化程度低下微不足道而变得不堪重负。

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