基于底栖动物群落相似性的黑水河替代生境的研究

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Abstract

As an important region of the Yangtze River Protection Strategy, downstream of Jinsha River plays a vital role as the reserve of fish germplasm resources. Therefore, protection of local aquatic ecosystem has been paid more attentions, particularly in the context of the operation of cascade hydropower stations. In this study, the similarity of macroinvertebrate community in three main tributaries of Jinsha River (i.e., Heishui River, Xixi River and Chishui River) and their relationships with the environmental factors were analyzed. The aim of this study was to explore the possibility of Heishui River as an alternative habitat of the Jinsha River. The results showed that Ephemeroptera, Trichoptera and Diptera were the dominant taxa, while Ephemeroptera was the most abundant taxa in all three rivers. The density, biomass, and diversity indices of macroinvertebrate community in Heishui River and Chishui River were all higher than those in Xixi River. A higher similarity of macroinvertebrate community was found between Heishui River and the upper reach of Chishui River, which dominated by the sensitive taxa of Baetidae. In contrast, its similarity with Xixi River, which is close to Heishui River, was relatively lower. Based on the canonical correspondence analysis, elevation and total nitrogen (TN) were identified as the most significant factors (P < 0.05)influencing the macroinvertebrate community structure, which represented as the regional and local habitat characteristics. Although the upstream of Chishui River was threatened by nitrogen enrichment, it still demonstrated a higher similarity with Heishui River than the rest region. The possible reason is that Chishui and Heishui rivers have similar physical habitats at the head stream reaches. Our findings highlighted the important roles of micro-habitats in structuring the macroinvertebrate community even at a relatively large spatial scale. Considering the higher similarities in terms of community structure, biomass as well as diversity pattern between the Heishui River and the Chishui River, they could be a potential alternative habitat for the ecological function protection in this area.

Key words： downstream of Jinsha River macroinvertebrate community similarity influencing factor ecological conservation

Received: 10 November 2019

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X37

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	Articles by authors
	Lü Ya-ning
	XIE Ying
	WANG Shao-ming
	QU Xiao-dong
	ZHANG Min

Cite this article:

Lü Ya-ning,XIE Ying,WANG Shao-ming等. Studies about Heishui River as an alternative habitat for aquatic biodiversity protection basedon macroinvertebrate community similarity[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(6): 2647-2657.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I6/2647

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