海南岛淡水龟类区系特点及保护优先性分析

海南岛是我国淡水龟类分布较为集中、物种丰富度高、动物区系独特的地区，已知的淡水龟有2科8属11种，占全国淡水龟种数(24种)的46％。海南岛淡水龟物种密度为3．2种／10^4km^2，均为东洋界成分，其中华南区种4种，占36．4％；华中-华南区共有的种7种，占63．6％；海南特有种2种，占岛内淡水龟种数的18．2％。海南岛淡水龟占华南地区淡水龟种数(19种)的57．9％。海南与广东、广西和香港的淡水龟类区系关系也十分密切，与它们的生物相似值分别为0．76、0．64和0．47。目前，中国75％的淡水龟类濒危，海南岛81．8％的淡水龟类濒危。分析表明，海南岛应是我国淡水龟类资源优先保育的地区。

Zoogeography and Conservation Priority of Hard-shelled Freshwater Turtles on Hainan Island

Hard-shelled freshwater turtles on Hainan Island are very rich and the fauna is also very distinctive. A total of 11 species were found on Hainan Island, accounting for 46% of total species in China. These species belong to 2 families and 8 genera. All these species belong to the Oriental Realm, of which 4 species belong to the South China Region accounting for 36.4%, 7 species belong to the Central-South Region accounting for 63.6%, 2 species areendemic to Hainan Island accounting for 18.2%.Species density reaches 3.2/10 4?km 2. A total of 19 species of hard-shelled freshwater turtles are recorded in South China accounting for 79.2% of China. The species of Hainan Island account for 57.9% of South China, while the fauna of Hainan Island is closely related to these of Guangdong, Guangxi and Hong Kong. The biotic resemblance value between Hainan Island and Guangdong is 0.76,0.64 between Hainan Island and Guangxi and 0.47 between Hainan Island and Hong Kong. Seventy-five percent of freshwater turtles of China are endangered, while 81.8% are endangered on Hainan Island. The Analysis indicates that hard-shelled freshwater turtles on Hainan Island have high conservation priority.