| 摘要: |
| 长江大量径流给其河口及邻近海域带来丰富的营养物质,维持了长江河口生态系统的巨大生产力,并使之成为多种重要经济鱼虾类的索饵和产卵场。长江口生态环境的变化,对我国最大、最重要的浙江舟山渔场和江苏吕四渔场的渔业资源有举足轻重的影响。三峡工程的兴建将使长江入海径流量及其季节分配有很大改变,也不可避免地影响到河口和近海的海洋环境、经济动物的组成及资源状况。为研究长江口无脊椎动物资源结构及其分布特征,以及预测三峡工程对自然生态环境的影响,于1985年9月至1986年8月进行了无脊椎动物资源底拖网试捕调查。本文系统整理调查所得资料,结合历史资料进行分析研究。 |
| 关键词: 三峡工程、长江口区、无脊椎动物 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第1838号 |
|
| PREDICTION OF THE IMPACTS OF THE THREE GORGES PROJECT ON THE INVERTEBRATE RESOURCES IN THE CHANGJIANG RIVER ESTUARY |
|
Liu Ruiyu(J.Y.Liu), Xiang Jianhai, Wu Yaouan, Zhang Baolin
|
|
Institute of Oceanology, Academia Sinica
|
| Abstract: |
| General characteristics of the economically important invertebrates were studied through monthly surveys with twin trawl in the period from September 1985 to August 1986. Sampling was made at each of the 33 stations. A total of about 145,000 individuals of invertebrates, belonging to 67 species, were collected and identified during the surveys. Among them, 48 species were crustaceans and 15 species were molluscs. Besides, data of fishing statistics and environmental factors were collected and analysede.The abundance and biomass of main invertebrate species in the investigated area changed seasonally. The abundance and biomass were 13, 318ind /k㎡ and 313.3kg/k㎡in summer, 12, 894 ind/k㎡and 523.4kg/k㎡ in autumn respectively,which aer much higher than 2283 ind/k㎡ in winter.
The ecological characteristics and seasonal numerical distribution of some dominant species. such as the brackish water species Exopalaemon annandalei,E. cariinicauda;the catadromous freshwater species Eriocheir sinensis and the common marine species: Portunus trituberculatus, Ovalipes punctatus, Solenocera crassicornis, Trachypennaeus curvirostris, Parapenaeopsis hardwickii, P. ctlurirostris and Sepiella maindroni, were briefly dcscribcd.
The main purpose of the study was to predict the impact of the Three Gorges Project the invertebrate resources. On the basis of fully understanding of the early life history of the woolly-handed crab, Eriocheir sinensis, which is one of the most important economic invertebrate in Changjiang Estuary, a conceptional model was developed. Furthermore, by stepwise regression analysis of multi-variable the relationship between the abundance of the crab seed (Megalopa )and various environmental factors, such as the monthly runoff flow of the Changjiang River and the precipitation, etc. was analysed. According to the presumable regulation of the rived runoff by the Three Gorges Project, the impact on the yield of the seed of wollyhanded crab was estimated. Similarly, the catch yields of the white shrimps and crabs were assessed. Some possible effects of the project on the resources, such as the changes of the distribution patterns of some invertebrate animals and the increase or decrease of their yield, are predictable. |
| Key words: THREE GORGES PROJECT,INVERTEBRATE RESOURCES,CHANGJIANG RIVER ESTUARY |
