The change in copepod abundance and diversity possibly influenced by an anomalous China Coastal Current in the southern Taiwan Strait

臺灣海峽南部之異常中國沿岸流對橈足類豐度及多樣性變化之影響

藍揚麒(Yang-Chi Lan) ； 洗宜樂(Yi-Le Sheng) ； 李明安(Ming-An Lee) ； 張懿(Yi Chang) ； 蔡萬生(Wan-Sheng Tsai) ； 王怡甄(Yi-Chen Wang)

《臺灣水產學會刊》 44卷2期 (2017/06) Pp. 111-123

https://doi.org/10.29822/JFST.201706_44(2).0004

摘要

The cold China Coastal Current (CCC) flows southward into the Taiwan Strait from the East China Sea in winter, and is usually blocked by the warm Kuroshio Branch Current in the water west of Penghu. An unexpected intrusion of CCC to the surrounding waters of Penghu happened in February 2008. This intrusion of cold event caused a drop of 3.5 °C in water temperature at station A inside the Chinwan Bay of Penghu, as compared with the February 2006. We recognized 103 species of copepods belonging to 3 orders, 21 families, and 41 genera identified in this study. The first five dominant copepods during this study periods included Centropages tenuiremis, Paracalanus aculeatus, Oncaea venusta, Temora turbinata, and Clausocalanus furcatus. The cluster analysis showed that copepod compositions at the station inside the bay were significantly different from those at the stations outside the bay. The cold event due to the intrusion of the CCC clearly changed the copepod compositions at station A in the following two months. C. tenuiremis bloomed at station A in the month following this cold event. In the meantime the cold event did not seem to have apparent effect on the copepod compositions of the stations outside the bay. Copepod diversities were significantly lower at the station inside the bay than those of stations outside the bay, especially in March 2008.

關鍵字

Taiwan Strait ； Penghu ； Centropages tenuiremis ； front ； cold event

並列摘要

低溫的中國沿岸流冬季時由東海向南流入台灣海峽，並遭受高溫的黑潮支流阻擋於澎湖西側海域。2008年2月期間，由於中國沿岸流非預期地入侵至澎湖周邊海域，造成澎湖青灣海域內測站A的海水溫度較2006年降低約3.5℃。本研究期間，在浮游動物的採樣分類方面，共計103種橈足類，分別屬包含於3目21科41屬之中；前五大優勢種包括瘦尾胸刺水蚤、針刺擬哲水蚤、麗隆水蚤、錐形寬水蚤及長尾基齒哲水蚤。由群聚分析結果顯示，青灣海域內之橈足類種類組成與灣外測站有顯著差異。寒害事件過後的兩個月，青灣海域內橈足類組成明顯改變，但青灣海域外的其他測站則沒有明顯的影響。寒害事件過後一個月期間，在A測站發現到大量的瘦尾胸刺水蚤。在橈足類種類多樣性方面，青灣水域內的測站低於灣外之測站，尤其以2008年3月最為明顯。

並列關鍵字

台灣海峽 ； 澎湖 ； 瘦尾胸刺水蚤 ； 鋒面 ； 寒害