Biodiv Sci ›› 1998, Vol. 06 ›› Issue (1): 42-48.DOI: 10.17520/biods.1998008

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Prediction of impacts of Changzhou Water Conservancy Project on waterbird in the reservoir area

ZHOU Fang,FANG Hui-Ling   

  1. Institute of Animal Sciences ,Guangxi University , Nanning  530005
  • Received:1997-01-23 Revised:1997-07-25 Online:1998-02-20 Published:1998-02-20

Abstract: There are 41 waterbird species in the Changzhou reservoir area. Of them , 38 species are grallatores. These waterbirds occur mainly in the river valley. An environmental assessment based on the habitats and ecological characteristics of waterbirds predicted that construction of the dam will make negative impacts on the grallatores. The habitats are divided into five types : (1) water surface of the river ; (2) sandbank and small islands ; (3) farm field along the river valley ; (4) ponds along the bank ; (5) small streams. The second type , sandbank and small island , will be lost almost completely , and hence the grallatores in this habitat will be seriously disturbed. The 30 wading bird species in this habitat will decrease to 12 species , and 96. 5 percent of the bird populations will decrease. The prediction analysis indicate , in the whole reservoir area , that five wading bird species will disappear when the dam is built . Of them ,Chinese Egret ( Egretta eulophotes) and Sacred Ibis ( Threskiornis aethiopicus) are state-protected bird species. The populations of 16 wading bird species will decrease to less than 20 percent ,and four species will decrease to 20~50 percent , five species to over 50 percent . Five wading bird species will be slightly influenced. Only one wading bird species will increase their populations. Due to the change of the habitat , a succession of waterbird community will take place with the number of species and populations of the grallatores decreasing and the natatores increasing. The critical endangered species White-eared Night Heron ( Gorsachius magnificus) is also impacted. It is suggested that a further survey on ecology of the species should be carried out so that an effective conservation measurement may be found.