Seasonal variation of copepoda and cladocera communities in subtropic karst reservoir — Case in the Hongfeng, the Baihua and the Aha lakes

Copepida and cladocera community is investigated for four times in the Hongfeng, the Baihua and the Aha lakes from 2008 to 2009. It is found that the copepod consists of 5 families, 11 genera, 19 species with one species is not identified and the cladocera consists of 5 families, 9 genera, and 14 species. Dominant species of copepoda are T.prasinus(Fischer), C.uicinus lobosus Kiefer and T.breuifurcatus Harada. Dominant species of cladocera are D.longispina(O.F.M.), C.cornuta Sars and B.longirostris(O.F.Müller) in all lakes. Total density of copepoda and cladocera is highest in spring, lower in autumn, lowest in summer in both the Hongfeng and the Aha lakes; the highest in summer, lower in autumn, lowest in winter in the Baihua lake. Seasonal biodiversity ordering ranks as AH＞BH＞HF in spring, BH＞AH＞HF in summer and winter, and AH＞HF＞BH in autumn. Seasonal weather change and pollution is important factor affecting copepida and cladocera community change.