碩士 / 國立東華大學 / 自然資源管理研究所 / 90 / This study aims at realization on annual and seasonal variation of scombrid assemblage in the edge of Kuroshio, and exploration on the driving force of assemblage variation as well. The composition of scombrid assemblage is estimated from daily catches of set net from 1993 to 2000. The historical data of environmental factors is supplied form weather stations. Kuroshio current provides a transport mechanism to pelagic scombrid migrating to Taiwanese coast. The western boundary of Kuroshio varies with monsoon systems of Northeast（NE） and Southwest（SW）: when NE monsoon prevailing the boundary moves onshore and SW offshore. Annual perturbation of the Kuroshio is one of clues that might influence scombrid assemblage. There are at least 8 genus 14 species appeared in the east coast of Taiwan. Except that Sarda orientalis occurred in late spring , Scomber spp. in early spring and Auxis thazard in autumn-winter and early summer, most of scombrid species occurred during prevailing NE monsoon. Scombrid assemblage could be categorized into 4 types, namely Auxis-1, Scomber, Mosaic, and Auxis-1 types. Basically, the annual assemblage changed from Auxis-1 type to Scomber, and then shift to Auxis-1 type. The assemblage of summer in 1997 and 1998 were not common, which departed from that of regular pattern; 1997/1998 El Nino and La Nina might be the clues. The transition of assemblage types is account of local or meso-scaled environmental perturbation. Meso-scaled variations of environmental factors, such as temperature, air pressure, and flood when El Nino occurred might connect to the variation of assemblage compositions.
| Identifer | oai:union.ndltd.org:TW/090NDHU5148001 |
| Date | January 2002 |
| Creators | Mu-Shiuan Shie, 謝沐璇 |
| Contributors | Kuo-Shih Hsu, 徐國士 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 72 |
Page generated in 0.0206 seconds