Journal Title
Title of Journal: Environ Biol Fish
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Abbravation: Environmental Biology of Fishes
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Publisher
Springer Netherlands
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Authors: Xin Gao Yu Zeng Jianwei Wang Huanzhang Liu
Publish Date: 2010/01/14
Volume: 87, Issue: 2, Pages: 163-173
Abstract
Long and short term investigations have revealed dramatic changes in fish communities after impoundments by reservoirs However the process of these changes during impoundment remains poorly studied In 2005 and 2006 before and during the second stage of impoundment of the Three Gorges Reservoir TGR in the upper reaches of the Yangtze China we investigated fish catches to assess the impacts of reservoir filling on fish community structure We conducted sampling at 2 sites Wanzhou reach which had been inundated by the first water filling in 2003 and Fuling reach which still remained a riverine site before this water filling The results revealed an evident and immediate shift of fish communities from lotic to lentic components In the Wanzhou reach during the filling the abundance percentage of lentic fish increased to 94 compared to 69 before the filling In the Fuling reach after the filling lotic fish declined in abundance from 99 to 85 while lentic fish increased from less than 1 to 12 in abundance Based on our investigation and the regulation scheme of the TGR we predicted that after the completion of the Three Gorges Dam TGD there would be typical lacustrine transitional and riverine zones in TGR with their corresponding fish assemblages We suggest that long term monitoring should be conducted to evaluate the future ecological effects and different strategies implemented in these three zones for conservation purposesThis study was funded by the key project of CAS KZCX1YW0801 the National Natural Science Foundation of China NSFC 40432003 and the Three Gorges Project ecoenvironmental monitoring system SX2006013 Also we are very grateful to the anonymous reviewers for the advice to our work especially one who corrected English for the draft of this paper in detail
Keywords:
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