东江干流(惠州段)水生生态系统关键物种的优先保护顺序

Priority of conservation of keystone species of aquatic ecosystem in Huizhou reach of the Dongjiang main river

以东江干流(惠州段)生物调查资料为依据,根据东江干流(惠州段)水生生态系统的食物结构,计算水生生态系统中各类种群的关键性指数,比较各类种群的关键性指数的大小,识别出关键物种;然后在计算每种关键物种濒危系数、遗传损失系数和物种价值系数的基础上得出其优先保护的顺序.结果表明:东江干流(惠州段)水生生态系统的关键物种为鱼类,处于1、2、3和4级保护级别的物种分别有1、3、7和39种;鲤鱼的保护顺序系数最高;四大家鱼亦应作为优先保护物种.

Based on biological survey data, the key indexes of various species are calculated in Huizhou reach of the Dongjiang main river, and the keystone species are identified by comparing the keystone index of various species, according to the food structure of aquatic ecosystem. The conservation priority of key species is determined through computing the threatened coefficient, the genetic coefficient and the specific value coefficient. The results show that fish is the key species, and there are 1, 3, 7 and 38 species to be given priority conservation separately for the first, the second, the third and the fourth class protection. The Dongjiang main river carp has the maximal protection order coefficient in aquatic ecosystem of Huizhou reach of the Dongjiang main river. Moreover, Chinese carps should also be regarded as the species of priority of conservation.