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頁籤選單縮合
題名 | 淡水河口兩種銀帶鰶Encrasicholina punctifer及Stolephorus insularis仔稚魚之攝食策略(2):餌料生物選擇性與種間攝食競爭 |
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作者姓名(中文) | 陳楊宗; 曾萬年; | 書刊名 | 臺灣水產學會刊 |
卷期 | 21:1 1994.03[民83.03] |
頁次 | 頁31-48 |
分類號 | 387.105 |
關鍵詞 | 布氏銀帶鰶; 島嶼銀帶鰶; 仔稚魚; 淡水河口; 餌料生物選擇性; Encrasicholina punctifer; Stolephorus insularis; Larvae; Tanshui river estuary; Prey selection; |
語文 | 中文(Chinese) |
中文摘要 | 布氏銀帶鰶(Encrosicholina punctifer Flowler,1938)與島嶼銀帶按鰶 (Stolephorus insularis Hardenberg, 1933)屬於沿岸迴游性魚類,廣泛分佈於熱帶與亞 熱帶太平洋與印度洋中。為瞭解紅樹林河口域浮游生物量與仔稚魚的攝食策略之關係,自 一九八九年十月至一九九○年十月,每月於淡水河口採集浮游性生物與仔稚魚,以出現法 與計數法分析這兩種銀帶鰶的食性。結果發現,植物性浮游生物藻華分別出現於春至秋季 ,而動物性浮游生物則只出現在春、秋雨季。布氏銀帶鰶與島嶼銀帶鰶仔稚魚的大量出現 時期為春、秋雨季與夏末秋初,與浮游性生物間存在食物利用依賴型關係。整體而言,兩 種仔稚魚對橈腳類、枝腳類、磷蝦與軟體動物幼生為正向偏好選擇;而對輪蟲、藤壺幼生 、原索動物幼生與多毛類幼生為逆向選擇。兩種銀帶鰶在秋季有明顯的食物利用的重疊現 象。文中並探討種間攝食競爭及其如何適應問題。 |
英文摘要 | Encrasicholina punctifer Flowler 1938 and stolephorus insularis Hardenberg 1933 are widely distributed in tropical and subtropical Indian and Pacific Ocean. To understand the adaptable feeding strategy of larval fish in relation to seasonal production cycle of plankton in subtropical mangrove estuary, fish larvae and plankton were monthly collected around one year from Oct. 1989 throght Oct. 1990. Feeding habits of the fish were analyzed by occurrence and numerical methods. Three bloom periods of phytoplankton in spring, summer, and autumn and two for zooplankton in spring and autumn were found, respectively. The larvae of Encrasicholina punctifer occurred in large number in spring and autumn, while Stolephorus insularis in late summer and early autumn. The food exploitation of the larvae are density dependent. The larvae of these two species have similar prey selectivity; positive selection for copepoda, branchiopoda, euphaussidae, and mollusca larvae; negative selection for rotifer, Balanus sp., and larvae of protochordata and polychaeta. Diet overlap was found among these two anchovies larvae in autumn. Adaptation for same habitat between these two species is discussed. |
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