三座南亚热带大型水库敞水区桡足类群落结构比较

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Abstract

The community structures of copepods in three large reservoirs of South China:Xinfengjiang Reservoir, Feilaixia Reservoir and Gongping Reservoir were investigated from 2000 to 2002. Among the three reservoirs, Xinfengjiang Reservoir is the only oligotrophic water body, Gongping Reservoir is mesotrophic but with higher TSI than Feilaixia Reservoir. In total, 14 species of copepods (8 Calanoida, 5 Cyclopoida and 1 Harpacticoida) were observed. Phyllodiaptomus tunguidus——a Chinese endemic species, and Neodiaptomus schmackeri were common species in Calanoids, while Mesocyclops thermocyclopoides, Thermocyclops taihokuensis and Tropocyclops bopingi were common species in Cyclopoids. Drainage area, water retention time, fish predation and trophic status were the principle factors influencing the species composition, abundance and biomass of copepods. The positive relationship was observed between species richness and the drainage areas of reservoirs. The riverine reservoir-Feilaixia Reservoir with largest catchment contains the highest species richness. Trophic status was associated with the abundance and biomass of copepods. Nutrient-enriched reservoirs support greater abundance and biomass of copepods. However, dominance of Calanoids was lower while dominance of cyclopoids, copepodids and nauplius were much higher in the nutrient-enriched reservoirs. Short water retention time explained the low abundance of copepods in Feilaixia reservoirs. Selective predation of predatory fish can largely reduce the abundance of adult copepods, but doesn't have much influence on species richness of copepods. The relationship between species richness and trophic status were markedly variable because of the difference in watershed background and fish predation among reservoirs.

Key words： copepods species richness community structure abundance reservoir South China

Received: 25 February 2010

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	LI Ying
	LIN Qiu-qi
	HAN Bo-ping

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LI Ying,LIN Qiu-qi,HAN Bo-ping. Comparative analysis of community structures of planktonic copepods in three large reservoirs, South China[J]. , 2010, 29(1): 22-29.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2010/V29/I1/22

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