Ecology of macrozoobenthic communities in two plat

Authors: Yongde Chi Wang Hongzhu

Publish Date: 2009/11/18

Volume: 26, Issue: 4, Pages: 345-352

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Abstract

Ecological studies on macrozoobenthos were conducted in two small plateau lakes in the YunnanGuizhou Plateau Southwest China Xingyun Lake XL a eutrophic lake whose main source of primary production was phytoplankton Chl a=9976±2401 μg/L and Yangzong Lake YL a mesotrophic lake Sampling was carried out from October 2002 to May 2004 Altogether 23 benthic taxa were identified in XL and 21 taxa in YL The density of benthos in XL was much lower than that in YL but the biomass was about equal in the two lakes being 1 423 ind/m2 and 871 g/m2 in XL and 4 249 ind/m2 and 860 g/m2 in YL The dominant species were Limnodrilus hoffmeisteri Branchiura sowerbyi Aulodrilus pluriseta and Chironomus sp in XL and Limnodrilus hoffmeisteri Aulodrilus pluriseta and Bellamya sp in YL Seasonal fluctuation occurred showing richer species in summer and winter but the density and biomass varied in different ways in the two lakes Analyses on functional feeding groups indicate that collectorgatherers were predominant but the relative abundances of other groups were different Stepwise multiple regression analysis demonstrated that the water depth conductivity and chlorophyll a were the key factors affecting macrozoobenthic abundance in the lakes

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