海南岛主要水系枯水期底栖硅藻群落特征及区系分析

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Abstract

Benthic diatoms from three river catchments across Hainan Island’s five national natural reserves were examined to explore the community structure and spatial distribution patterns. Among the 174 benthic diatom species in 55 genera observed from the 30 sampling sites, the dominant genus is Achnanthes with relative abundance of 52.3%. Cluster analysis and non-metric multidimensional scaling (NMDS) analysis reveal a distinct geographic pattern, which differentiate the western Bawangling, western Jianfengling, the middle Yinggeling and Wuzhishan, and the eastern Diaoluoshan with various characteristic benthic diatom communities. Diatom diversity is the lowest in the western mountain zone but highest in the middle mountain zone. The contrast in benthic diatom community between the western mountains, and the middle and eastern mountains possibly suggests a climate control by southeast Asian monsoon. At most of the 30 study sites, the dominant species are indicators of clean water quality, such as Achnanthidium minutissimum, A. rivulare, Achnanthes subhudsonis, Gomphonema clevei and Navicula cryptotenella; whereas only a few sites contain Gomphonema parvulum and Aulacoseira ambigua, indicators of high levels of nutrients. This indicates that the rivers investigated are in good condition, but one should be cautioned against the eutrophication trend at a few sites with intensified human activities.

Key words： Hainan Island benthic diatoms spatial distribution pattern cluster analysis NMDS

Received: 25 February 2013

Q178.532

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	Articles by authors
	CHEN Qiu-ju
	XIA Wei
	TANG Hong-qu
	JIANG Shi-jun

Cite this article:

CHEN Qiu-ju,XIA Wei,TANG Hong-qu, et al. Benthic diatom assemblages and their distribution pattern during a low water season in the main catchments of Hainan Island[J]. , 2013, 32(1): 1-7.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2013/V32/I1/1

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