Knowledge Resource Center for Ecological Environment in Arid Area
| 报告编号 | PB2008101360 |
| Issues in Defining, Detecting, and Quantifying Rare Species. | |
| Abarca, F. J; Allison, L. J. | |
| 英文摘要 | Complex geologic, climatic, and evolutionary processes that started more than 100 million of years ago resulted in a variety of desert fishes well adapted to extreme conditions of heat and water fluctuations during alternating periods of flood and drought. About 170 species comprise the unique and ancient assemblage of western United States native fishes (Downling and Childs 1992). Comparing ichthyofaunas east and west of the Rocky Mountain axis, western fish fauna is characterized as depauperate and presenting a high number of endemic subfaunas, as a result of a long history of disruptive geologic and climatic events that substantially reduced the diversity, availability, and reliability of aquatic habitats (Minckley and Douglas 1991). In addition to these factors, detrimental human activities on aquatic systems -including habitat destruction and modification, and introduction of non-native species- have contributed to the rapid and drastic decline of desert fishes in the Southwest to the point that most of them are now listed as threatened or endangered. Similar declines have been observed in many parts of the world. |
| 英文关键词 | Fishes Rare species Southwest region(United States) Threatened species Endangered species Detecting Quantifying Defining Native fishes Desert fishes Ichthyofaunas |
| 出版年 | 2000 |
| 语种 | 英语 |
| 国家 | 美国 |
| URL | http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=5a001f8131c97d1c38964d80 |
| 来源机构 | Bureau of Reclamation |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/272865 |
| 推荐引用方式 GB/T 7714 | Abarca, F. J,Allison, L. J.. Issues in Defining, Detecting, and Quantifying Rare Species.,2000. |
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