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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47619

Title: 氣候變異對臺灣海峽冬季午仔捕獲率及分布之影響
The impact of climate variability on threadfin catch rate and distribution during the winter of Taiwan Strait
Authors: Lee, Yu-Lin
Contributors: NTOU:Department of Environmental Biology and Fisheries Science
Keywords: 臺灣海峽;午仔;氣候變異;適合度指數
Taiwan Strait;threadfin;climate variability;Suitability Index
Date: 2016
Issue Date: 2018-08-08T03:25:00Z
Abstract: 午仔為臺灣海峽沿近海重要商業魚種之一,其年捕獲量於1988年達到巔峰後,便轉為逐年下降之趨勢,然而臺灣相關漁海況研究卻仍較為缺乏。本研究收集漁業統計年報1958~2013年之午仔年漁獲量與歷年拖網漁船總噸數計算午仔年別平均捕獲率,同時收集2015年1至12月臺灣海峽近岸海域刺網午仔日別捕獲資料,以建構不同時間、空間尺度之漁獲資料,並結合氣候變異指數與海洋表面溫度(SST)分別利用時序列小波分析法與適合度指數(SI)分析海洋環境變動對午仔捕獲率之影響。 分析研究結果顯示午仔之主要漁期為冬季(12至2月),漁獲重心有隨季節變化呈現南北推移之現象,年別漁獲重心則是呈現逐年北移的趨勢。而午仔年別捕獲率與秋季太平洋十年震盪指數(PDO)、秋季SST、冬季Nino3.4、冬季南方震盪指數(SOI)、冬季西太平洋指數(WP)皆呈現顯著相關,並且在1975至1995年間與PDO、SST、Nino3.4、SOI有約4至6年之循環周期,其中PDO、Nino3.4為正相關而SOI、SST則為負相關,而WP在研究期間則與年別捕獲率呈現4至8年正相關循環周期。進一步分析午仔主要漁期冬季之高適水溫適合度範圍(SI>0.8)分布約在21.42℃至22.18℃之間,且當聖嬰年或是WP為正相位年時,臺灣海峽冬季SST將會上升,進而擴大午仔之高適合度分布棲地範圍,同時其年別捕獲率皆分別會較正常年增加約17.63%與19.21%;反之,當反聖嬰年與或WP為負相位年時,臺灣海峽冬季SST相對較低,並導致午仔之高適合分布棲地範圍呈現萎縮之趨勢,然而其對捕獲率之影響則較不明顯。
Threadfin is one of the most important commercial species of fish in the coastal fisheries of Taiwan. The catch of threadfin exhibiting a peak in 1988 and its population has rapidly declined. However, direct studies related to fishery oceanography of threadfin in Taiwan Strait are scarce. In this study, we collected the annual landing data of threadfin in the Taiwan Strait from 1958~2013 and the total tonnages of trawl vessel from fisheries yearbook and daily logbook data from coastal gillnet fisheries to construct different temporal and spatial fishery data. Furthermore, we also collected climate indices and sea surface temperature data to investigate the influences of marine variations on catch rate by using time series wavelet analysis and suitability index at different multiple time scales. The result showed the major fishing season is in the winter and also showed the seasonal variations in the latitudinal catch percentage of threadfin in the Taiwan Strait. In addition, the landing data of threadfin distribution revealed the northward migrated trend. The time series analysis displayed the significant correlation among the catch rate and autumn PDO, autumn SST, winter Nino3.4, winter SOI, winter WP, which PDO, SST, Nino3.4, SOI have 4 to 6-year periodicity in 1975~1995. PDO and Nino3.4 were positively correlated to the catch rate, while the SOI and SST were negative correlated. Additionally, the catch rate and WP showed fairly good positive correspondence and have 4 to 8-year periodicity during the study period. Furthermore, the high suitability range (SI>0.8) of SST were in the range between 21.42~22.18℃. When El Nino or WP positive phase occurred which led to the winter SST rises in Taiwan Strait, thus expanding the high suitability habitat of threadfin increased and the annual catch rate approximately 17.63% and 19.21% respectively than in the nominal events. In contrast, La Niña or WP negative phase resulting the winter SST decrease in Taiwan Strait, thus the high suitability habitat of threadfin shrinking, however, its impact on the catch rate is not obvious.
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0010431002.id
Appears in Collections:[環境生物與漁業科學學系] 博碩士論文

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