关键词: 三峡库区, 鼠类, 变动趋势

Abstract:

Objective To understand the trend of rodents in the hydraulic cascade development process in the Yichang section of the Three Gorges area, in order to provide important background information for medical assessment of the environment where large-scale water control projects were planned, and take measures timely to deal with problems associated with the pests. Methods Sequential investigation into the density and population of rodents in the Yichang section of the Three Gorges area had been implemented with the trap-night method since 1959. Results The density of rodents in the section in different periods of time generally presented a declining trend with a higher density outdoors than indoors. Compared with other periods the density of rodents from 1971 to 1980 was of the highest value (12.98%). In the years from 2001 to 2009, when the second and third stage construction of the Three Gorges Project was completed, the density of rodents in the section fell to its lowerest level (1.16%) in the history, which should be credited to the four times of thorough bottom clearance and the active rodent eradication in the reservoir area. The significant difference in both outdoor and indoor rodent species composition may be related to the alteration of the ecological environment, the migration and proliferation of biological species, and the competition between the different species. Conclusion The thorough sanitary clearances have a positive effect on the reduction of the rodent density in the reservoir area,which now is at the minimum level. It is not seen that the hydropower projects have a significant impact on it.

Key words: Three Gorges area, Rodent, Trend