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首页> 外文期刊>Journal of Fish Biology >Trophic ecology of Atlantic bluefin tuna Thunnus thynnus larvae
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Trophic ecology of Atlantic bluefin tuna Thunnus thynnus larvae

机译：大西洋蓝鳍金枪鱼Thunnus thynnus幼虫的营养生态

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Feeding intensity, diet composition, selectivity, energy ingestion and dietary niche breadth of larval Atlantic bluefin tuna Thunnus thynnus were studied on the eastern (Mediterranean) spawning grounds of the species. Larval T. thynnus were collected in the Balearic Archipelago (north-west Mediterranean Sea) during 2004 and 2005 using surveys specific for larval scombrids. Larvae between 2.6 and 8.7 mm standard length (L-S) are diurnal feeders, and 94% of the guts collected during daylight hours were full. The mean +/- S.D. number of prey per gut was 7.1 +/- 5.7, with mean +/- S.D. ranging from 3.0 +/- 1.6 in the smallest T. thynnus larvae to 11.1 +/- 5.8 in 5.0-6.0 mm L-S larvae. Up to 21 prey were found in a single larval gut (5.0-6.0 mm L-S) at the end of the day. Larvae progressively selected larger prey and exhibited increased carbon content concurrent with preflexion development of feeding and locomotory structures. Larvae of 5.0-6.0 mm L-S exhibited positive selection of cladocerans over other prey (Chesson's index), whereas copepod nauplii dominated the diets of earlier stages. The dietary niche breadth measured increased initially but decreased at c. 5.5 mm L-S. Appendicularians were found in the diet of larger larval sizes, but no piscivory was observed. Results are discussed in light of the sparse existing data for larval T. thynnus and other larval tuna species. Journal of Fish Biology (C) 2011 The Fisheries Society of the British Isles No claim to original US government works
机译：在该物种东部（地中海）产卵场研究了大西洋蓝鳍金枪鱼幼体金枪鱼（Thunnus thynnus）的摄食强度，日粮组成，选择性，能量摄入和日粮生态位宽度。幼虫T. thynnus于2004年至2005年间在巴利阿里群岛（西北地中海）采集，使用的是幼虫对幼虫的专项调查。标准长度（L-S）在2.6至8.7毫米之间的幼虫是昼夜饲养者，白天白天收集到的胆量占94％。平均值+/- S.D.每个肠道的猎物数量为7.1 +/- 5.7，平均值为+/-S.D。范围从最小的T.thynnus幼虫的3.0 +/- 1.6到5.0-6.0 mm的L-S幼虫的11.1 +/- 5.8。一天结束时，在一个幼虫肠道（5.0-6.0毫米L-S）中发现多达21个猎物。幼虫逐渐选择更大的猎物，并显示碳含量增加，同时进食和机体结构发生前屈。 5.0-6.0毫米L-S的幼虫比其他猎物表现出对角果类的积极选择（切森指数），而co足类无节幼体在早期阶段的饮食中占主导地位。最初测量的饮食生态位宽度增加，但在c时降低。 5.5毫米L-S。在较大幼虫的饮食中发现了阑尾动物，但未观察到食肉动物。鉴于幼体T. thynnus和其他幼体金枪鱼物种的稀疏现有数据，对结果进行了讨论。 《鱼类生物学杂志》（C），2011年，不列颠群岛渔业协会，无声称拥有美国政府的原始著作

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