National Taiwan Ocean University Institutional Repository:Item 987654321/34189
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题名: Trends in trawl-targeted species landings off northern Taiwan and effects of fishing and environmental factors
作者: Chih-Shin Chen;Bei-Wen Lee
陳志炘
贡献者: NTOU:Institute of Marine Affairs and Resource Managemen
國立臺灣海洋大學:海洋事務與資源管理研究所
关键词: Dynamic factor analysis (DFA), East China Sea, Fisheries management, Landing trends, Northern Taiwan, Southern Oscillation Index (SOI)
日期: 2013-03
上传时间: 2013-10-07T02:04:46Z
出版者: Fisheries Science
摘要: abstract:Time series of landings may provide information
crucial to achieving a better understanding of temporal
variations in the abundances and compositions of exploited
species and ecosystems. The waters off northern Taiwan,
located in the southern East China Sea, are one of the most
important fishing grounds for Taiwan’s coastal and neritic
fisheries. Temporal variations in the abundances of the
species exploited in this region are rarely studied because
of the multi-gear fisheries involved. In this study, trends in
the landing per unit effort (LPUE) time series for 13 trawltargeted
species (groups) off northern Taiwan from 1976 to
2007 were explored using dynamic factor analysis (DFA).
Potential effects of fishing effort (number of vessels) and
environmental factors [Southern Oscillation Index, sea
surface temperature (SST) near northern Taiwan, and river
discharge] were examined. The optimum DFA model
included three common trends and three explanatory variables
(excluding SST). A general decreasing pattern was
identified from among the common trends, and this was
observed in the LPUE time series for most of the species.
Fishing effort is an important explanatory variable in the
model, suggesting that it plays a critical role in explaining
LPUE variations of trawl-targeted species. The common
trends identified here could lead to new strategies for
fisheries management, particularly where multi-gear fisheries
operate and multiple species are targeted.
關聯: 79(2), pp.163-176
URI: http://ntour.ntou.edu.tw/handle/987654321/34189
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