| Title |
Fish Distribution and Compositions Along with Altitude and Longitudinal Distance from the River Mouth in the Tamjin River Basin, Korea |
| Authors |
문운기 ( Woon Ki Moon ) ; 배대열 ( Dae Yeul Bae ) ; 서진원 ( Jin Won Seo ) ; 안광국 ( Kwang Guk An ) |
| Keywords |
Altitude gradient; Fish distribution; longitudinal distance; Tamjin River |
| Abstract |
This study is focused on fish fauna and distributional features along with physical gradients and stream orders in the Tamjin River basin, Korea. Fish sampling and investigation were conducted for 2 years from 2009 to 2010, Total number of fish species collected were 47 species of 16 family, The group of cyprinidae was mostly abundant, Both fish abundance and biotic index were declined with increasing altitude and longitudinal distance from the river mouth. Two species of Zacco temminckii and Pungtungia herzi were prevalent in most of sampling sites and showed no altitudinal and longitudinal differences. Most other species, however, were spatially restricted to specific regional altitudes. Several species including Zacco platypus, Squalidus gracilis majimae and P, herzi were broadly distributed from river mouth to 50 km, Eight species including Z, temminckii and Rhynchocypris oxycephalus only appeared in over 10 km from the river mouth. Both Odontobutis platycephala and Pseudobagrus koreanus were classified as "upstream dewelling species" observed only in over 30 km from the river mouth, High proportion of tolerant and omnivorous species were more dominated in the downstream zone of the dam, whereas intolerant and insectivorous species were abundant in the upstream zone of the dam. The variable of stream order showed positive relationship between number of fish species and total individuals collected. Sensitive species including insectivore had a declining tendency with increasing stream order, while tolerant specie including omnivore species had relatively increased with stream order. Overall, our study suggested that fish distribution considerably depends on altitudinal gradient and longitudinal distance from the river mouth as well as physical habitat. |