淡水河口兩種銀帶鰶Encrasicholina Punctifer及Stolephorus Insularis仔稚魚之攝食策略—Ⅱ餌料生物選擇性與種間攝食競爭

Feeding Strategy of Two Larval Anchovies,Encrasicholina Punctifer and Stolephorus Insularis,in the Tanshui River Estuary,Taiwan-ⅡPrey Selectivity and Interspecific Feeding Competition

陳楊宗(Yarng-Tzung Chern) ； 曾萬年(Wann-Nian Tzeng)

《臺灣水產學會刊》 21卷1期 (1994/03) Pp. 31-48

https://doi.org/10.29822/JFST.199403.0003

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爲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變數有關連的因子，嘗試以主成分分析法探討臺灣西南海域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爲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。

關鍵字

布氏銀帶鰶 ； 島嶼銀帶鰶 ； 仔稚魚 ； 淡水河口 ； 餌料生物選擇性

並列摘要

Oceanographic and meteorological variables were analyzed by means of principalcomponent analysis to determine environmental factors that affect seasonal changes incommercial catches of larval anchovy fishery in the southwest coastal waters of Taiwan.The monthly catches were significantly positively correlated with surface water salinityand wind speed that affects upwelling and nutrient enrichment of the coastal waters.Thecatches were negatively correlated with surface water temperature and with cloud coverage,precipiation and river discharges that affects water salinity.The catches increased in thewinter 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 wereat low levels from June to September,due to high temperature and low salinity causedby increasing precipitation and river discharges.The catches remained low in the earlydry season from October to December because of persistent with high water temperature.

並列關鍵字

Encrasicholina Punctifer ； Stolephorus Insularis ； Larvae ； Tanshui River Estuary ； Prey Selection