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題 名 | Seasonal Changes in Commerical Catches of Larval Anchovy in the Southwest Coastal Waters of Taiwan=臺灣西南海域鮆科稚魚漁獲量之季節變動 |
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作 者 | 李明安; 李國添; 夏光耀; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 21:1 1994.03[民83.03] |
頁 次 | 頁49-56 |
分類號 | 439.22 |
關鍵詞 | 主成分分析; 鮆科稚魚; 季節變動; Principal component analysis; Larval anchovy; Seasonal variation; |
語 文 | 英文(English) |
中文摘要 | 影響屏東枋寮沿海鮆科稚魚之漁況變動的要因可歸納為生物與非生物因子兩 大類,但漁獲量之季節變動尚未究明。故本研究乃選取與漁況變動數有關連的因子,嘗試 以主成分分析法探討臺灣西南海域妖鮆科稚魚漁獲量之季節變動特性。其結果顯示以月別 漁獲量與各因子之主成分分析結果中,對應於第一∼三主成分因子之累積寄與率為74.8% ,亦即由該三個主成分因子代表全部因子之變動情形時,僅有25.2%之資料損失。再者由 主成分得點之散布圖可知,在乾旱期,隨著月別之推移,漁獲量有逐漸昇高之現象,而隨 著雨季之來臨,河川流量增加,漁獲量降低。此外,結果亦顯示漁獲量與表面水溫成負相 關關係。 |
英文摘要 | Oceanographic and meteorological variables were analyzed by means of principal component analysis to determine environmental factors that affect seasonal changes in commercial catches of larval anchovy fishery in the southwest coastal waters of Taiwan. The monthly catches were significantly positively correlated with surface water salinity and wind speed that affects upwelling and nutrient enrichment of the coastal waters. The catches were negatively correlated with surface water temperature and with cloud coverage, precipiation and river discharges that affects water salinity. The catches increased in the winter dry season from January to April (low temperature, high salinity and wind speed), and decreased in May at the beginning of the summer monsoon season. The catches were at low levels from June to September, due to high temperature and low salinity caused by increasing precipitation and river discharges. The catches remained low in the early dry season from October to December because of persistent with high water temperature. |
本系統中英文摘要資訊取自各篇刊載內容。