摘要
对 1 990— 1 999年间长江下游江段生物多样性的变动趋势进行了研究 ,并就群落稳定性与多样性的关系进行了探讨。结果表明 :物种多样性指数量大值为 1 .1 1 1 2 ;最小值为 0 .0 32 7。反映物种均匀度、丰盛度的指数都有不同程度的下降 ,而反映优势度的指数却有一定程度的上升 ,优势度指数最大值为 1 ;最小值为 0 .340 4 6,优势种前 6位分别为杂虾、青虾、餐条、吻、蛇、黄颡。表明长江下游江段的生物多样性正在逐步丧失。经济鱼类数量趋减 ,小型野杂鱼类数量趋增。
The annual variations of bio diversity in the lower reaches of the Yangtze River during 1990-1999 were being studied,and the relationship between the bio diversity and the community stability was also being discussed by the authors. The results indicated that the maximum Shannon Wiener Diversity was 1.1112 and the minimum index was 0.0327.The species abundance and indices and evenness were declining to different degrees,while the McNaughton index heightened. The maximum McNaughton was 1 and the minimum index was 0.340457.The advantage species were shrimp, Macrobrachium nipponense,Hemiculter leucisculus, Rhinogobio typus,Saurogobio dabryi and Pseudobagrus fulvidraco from first to sixth.It showed that bio diversity in the lower reaches of the Yangtze River was declining gradually,and the quantity of fish with high economic value was declining and the quantity of small low valued fish was increasing.
出处
《水生生物学报》
CAS
CSCD
北大核心
2002年第6期654-661,共8页
Acta Hydrobiologica Sinica
基金
国务院三峡办
长江三峡工程开发公司基金 (SX97 0 1 )
长江渔业资源管理委员会基金
世界自然基金会基金资助
关键词
长江下游
水生动物群落
生物多样性
变动趋势
The lower reaches of the Yangtze River
Aquatic animals
Bio diversity