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題名 | 點帶石斑魚苗殘食者對不同體型被捕食者之選擇性=Prey Size Selection in Cannibalistic Fry of the Orange-spotted Grouper (Epinephelus Coioides) |
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作者姓名(中文) | 許晉榮; | 書刊名 | 水產研究 |
卷期 | 14:2 民95.12 |
頁次 | 頁69-74 |
分類號 | 439.5 |
關鍵詞 | 殘食; 點帶石斑; 體型選擇; Cannibalism; Orange-spotted grouper; Epinephelus coioides; Size selection; |
語文 | 中文(Chinese) |
中文摘要 | 點帶石斑魚 (Epinephelus coioides) 的育苗過程中,殘食是一個經常被發現的現象。本實驗之目的即在探查石斑魚苗殘食者對不同體型被捕食者之選擇性。實驗結果顯示,當提供三種不同體型大小的被捕食者給殘食者時,縱使殘食者吃得下體型最大者,牠仍喜好選擇吞噬體型較小者。此種體型選擇的攝食行為可能與其最適攝食策略有關。因為追獵石斑被捕食者與處理時間,都會隨著被捕食者體型的增大而增長,由此行為所耗損之能量,應會大於其捕獵大型被捕食者所得到之能量,以致得不償失。而捕捉較小的被捕食者,魚體脫落或逃跑的機會較少,殘食者因而可藉此殘食有效率地得到所需之能量。 |
英文摘要 | During larviculture of the orange-spotted grouper, Epinephelus coioides, cannibalism is a frequent phenomenon. The aim of this study was to investigate the prey size selection of the cannibalistic orange-spotted grouper fry. The results showed that when offered prey of three sizes, the cannibal preferred the smaller prey to the larger ones although it was capable of engulfing the larger individuals. Size selection should be related to an optimal foraging strategy by the grouper. An increase in the energy in pursuit and handling time for larger prey would exceed the benefits gained from consumption of the prey. Eating smaller prey can reduce the risk of failing or the prey escaping. Thus, grouper can efficiently gain energy through cannibalistic acts against smaller prey. |
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