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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Seasonal dynamic of fish communities in the three gorges reservoir of the yangtze river, china
Seasonal dynamic of fish communities in the three gorges reservoir of the yangtze river, china
Author : Yang Shaorong1, Li Mingzheng2, Liu Huanzhang2
Abstract To investigate impacts of reservoir impoundment on fish communities, the
monthly investigation on fish communities in the Mudong and Wanzhou sections in
the Three Gorges Reservoir (TGR) of the Yangtze River, China were conducted from
June 2007 to October 2008. The Mudong section is at the end of the TGR where the
environment is still river-like, while the Wanzhou section is in the middle of the TGR
and the water is much stagnant. A total of 38 species were found in Mudong section
and 58 species in Wanzhou section during the investigation period, and there were
significant differences in the fish compositions between these two sections.
Rheophilic species such as Coreius guichenoti, Gobiobotia filifer, Pelteobagrus
vachelli, Pelteobagrus nitidus, C. Heterodon and Saurogobio dabryi were the
dominant species in the Mudong section. And the fish species endemic to the upper
reaches of the Yangtze River accounted for a certain proportion in this section. In
contrast, the Wanzhou section were dominated by limnophilic species such as
Hemiculter bleekeri, Cyprinus carpio, Carassius auratus, Hemiculter leucisculus, and
Hypophthalmichthys molitrix. Besides, several exotic species were found in Wanzhou
section. For both these sections, the Margalef index (D) and Shannon-Wiener index
(H) were higher in low water seasons than in other seasons, and Pielous evenness
index (J) was stable through all the time. The multivariate analysis of the monthly
samples indicated a significant seasonal change in the fish community. And our
analysis indicate different seasonal dynamic of fish communities in different sections
of the TGR, and therefore the different impacts of the reservoir impoundment.
File Size : 545,310 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 28/08/2015
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