River Ecology and Restoration - River Dynamics and Integrated River Management - page 683

High diversity of habitat supports high diversity of bio-community, which may be illustrated with the
sampling results of macro-invertebrates in several mountain streams in the Xiaojiang River basin in
Yunnan Province in southwestern China. Figure 10.44 shows the relations between the habitat diversity,
H D , and the species richness, S , the Shannon Weaver index, H , and the bio-community index, B , for these
streams. In general, the higher is the habitat diversity, the higher are the species richness, the bio-diversity,
and the bio-community index. However, the species richness, S, has the best relation with the habitat
diversity clearly showing an increasing trend with habitat diversity. The bio-community index, B, also
linearly increases with the habitat diversity. The Shannon-Weaver Index, H , increases with the habitat
diversity, but the points around the H D ~H curve is rather scattered. The results suggest that the species
richness, S , and bio-community index, B , are suitable ecological indicators for good habitat in streams
that are not impaired by poor water quality. Similar results also were obtained from a study on the East
River basin in Guangdong Province. Figure 10.45 shows the relations of the habitat diversity, H D , with the
Shannon-Weaver index, H , and bio-community index, B, for the East River. The higher is the habitat diversity,
the higher are the biodiversity and bio-community indices. The bio-community index, B , increases with habitat
diversity, H D , and the points of B-H D relation are much closer to the curve than the relation of H-H D .
Fig. 10.44 Species richness, S ; Shannon-Weaver Index, H ; and the bio-community index, B , as functions of the
habitat diversity index, H D
Fig. 10.45 Relation between habitat diversity, H D , and Shannon-Weaver index, H (upper); and the relation between
habitat diversity, H D , and bio-community index, B (lower)