Erratum to: Diet of young Atlantic bluefin tuna (Thunnus thynnus) in eastern and western Atlantic foraging grounds
Erratum to: Diet of young Atlantic bluefin tuna (Thunnus thynnus) in eastern and western Atlantic foraging grounds
复制标题
勘误表：大西洋东部和西部觅食地幼年大西洋蓝鳍金枪鱼 (Thunnus thynnus) 的饮食
DOI：
10.1007/s00227-011-1758-8
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. Lutcavage
中科院分区：
文献类型：
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作者：
J. Logan;E. Rodriguez;N. Goñi;S. Barreiro;H. Arrizabalaga;Walter J. Golet;M. Lutcavage
大西洋蓝鳍金枪鱼（Thunnus thynnus）是高度洄游的捕食者，其数量，分布和身体状况在过去几十年中发生了变化。在几个觅食地，猎物群落的组成和丰度也各不相同。为了更好地了解潜在的食物网和区域能源，我们进行了胃内容物和稳定同位素分析，主要是青少年（60-150厘米弯曲叉长）的蓝鳍金枪鱼在西部（中大西洋湾）和东部（比斯开湾）大西洋的觅食地捕获。在中大西洋湾，蓝鳍金枪鱼的饮食主要是沙矛（Ammodytesspp.，29%的猎物重量），与历史研究结果一致。在比斯开湾，磷虾（Meganyctiphanes norvegica）和（Engraulis encrasicolus）占猎物重量的39%，每一个的相对消费反映了猎物丰度的年度变化。在这种猎物资源的局部崩溃之后，鱼的消费量显然下降了。在这两个地区，稳定同位素分析结果表明，青少年蓝鳍金枪鱼喂养在一个较低的营养位置比胃内容物分析表明。在中大西洋湾，稳定同位素分析表明，>30%的饮食是来自较低营养水平的猎物，根据传统的胃内容物分析，占猎物重量的10%以下。营养的位置是类似的幼鱼采样在西北大西洋，但低于少年在地中海在以前的研究中采样。我们的研究结果表明，青少年蓝鳍金枪鱼的目标范围相对较小的猎物物种和区域觅食模式保持一致，随着时间的推移，在中大西洋湾，但在比斯开湾的本地猎物的可用性发生变化。
Atlantic bluefin tuna (Thunnus thynnus) are highly migratory predators whose abundance, distribution, and somatic condition have changed over the past decades. Prey community composition and abundance have also varied in several foraging grounds. To better understand underlying food webs and regional energy sources, we performed stomach content and stable isotope analyses on mainly juvenile (60–150 cm curved fork length) bluefin tuna captured in foraging grounds in the western (Mid-Atlantic Bight) and eastern (Bay of Biscay) Atlantic Ocean. In the Mid-Atlantic Bight, bluefin tuna diet was mainly sand lance (Ammodytesspp., 29% prey weight), consistent with historic findings. In the Bay of Biscay, krill (Meganyctiphanes norvegica) and anchovy (Engraulis encrasicolus) made up 39% prey weight, with relative consumption of each reflecting annual changes in prey abundance. Consumption of anchovies apparently declined after the local collapse of this prey resource. In both regions, stable isotope analysis results showed that juvenile bluefin tuna fed at a lower trophic position than indicated by stomach content analysis. In the Mid-Atlantic Bight, stable isotope analyses suggested that >30% of the diet was prey from lower trophic levels that composed <10% of the prey weights based upon traditional stomach content analyses. Trophic position was similar to juvenile fish sampled in the NW Atlantic but lower than juveniles sampled in the Mediterranean Sea in previous studies. Our findings indicate that juvenile bluefin tuna targeted a relatively small range of prey species and regional foraging patterns remained consistent over time in the Mid-Atlantic Bight but changed in relation to local prey availability in the Bay of Biscay.