云南湿地生态系统鱼类物种濒危机制初探

湿地生态系统是鱼类生存、繁衍之地。由于云南地理位置特殊，鱼类多样性的研究及保护状况不仅在国内具有重要地位，对下游地区或国家也影响极大。因此，应引起国内、外生物学界和保护组织的高度重视。云南鱼类多样性的特点是：种类丰富、特有类群多；区民分复杂物种类型多样；种群小、数量少。对云南钱的种生存构成威胁的外在因素包括；围湖力沼泽化造成的栖息环境破坏，引种产生的物种生存空间及食物的竞争污染引起的生存环境质量下

A preliminary study on endangerment mechanism of freshwater fish species in wetland ecosystem of Yunnan

Wetland ecosystem is the living and breeding area of fish. Because its special location, the study and conservation of fish diversity of Yunnan are very important not only for China, but for neighboring districts and countries. So it should be paid great attention by biologists and conservation organizations. There are many characteristics in fish fauna of Yunnan, such as abundant species and endemic species, complex fauna and diverse species types and small population size. The following factors affect fish living and breeding: habitats damaged by reclaiming land from lakes and swamping, competition for space and food from introduced species, worsening environment quality by pollution, population decrease or extinction resulted from over_fishing, water environment changes by dam and power station, influence from water resources exhaustion and forest declination. All groups of living things and the internal extinctive mechanism of fish species should be studied for conserving organisms in wetland ecosystem. The law of species introduction should be legislated immediately.