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首页> 外文期刊>Marine ecology progress series >Feeding patterns of age-0 bluefin tuna in the western Mediterranean inferred from stomach-content and isotope analyses
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Feeding patterns of age-0 bluefin tuna in the western Mediterranean inferred from stomach-content and isotope analyses

机译：从胃中含量和同位素分析推断地中海西部0岁蓝鳍金枪鱼的摄食模式

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摘要

Knowing how migratory pelagic predators use food web resources during early life stages is essential for understanding population dynamics and recruitment. Feeding habits of similar to 3 to 4 mo old Atlantic bluefin tuna (ABFT) Thunnus thynnus from 2 Mediterranean nearshore areas (Cartagena and Cambrils, Spain) showing distinct oceanographic features were investigated using stomach-content (SCA) and stable-isotope (SIA) analyses. SCA showed diet variability between areas and years; further correspondence analysis revealed that epipelagic fishes (primarily anchovy and sardine) constitute the staple diet of age-0 ABFT in Cambrils, whereas mesopelagic fishes (especially myctophids) and squid were consumed in significant amounts by ABFT in Cartagena. delta C-13 values differed significantly between tissues (white muscle and liver), areas and years (2009 and 2010), while delta N-15 values were not significantly different. In all cases, mean delta C-13 values were significantly higher in muscle than in liver, while differences in delta C-13 between locations and years were also observed in some instances. Estimations of trophic niche width using the antilogarithm of Shannon's entropy, exp(H), and from stable isotope Bayesian ellipses, SEA(c), indicated that niche width was generally larger in samples from Cambrils than in those from Cartagena. Moreover, SEA(c) analysis suggested that trophic niches were broader in 2010 than in 2009. Our results indicate a low degree of feeding specialisation and suggest that, like older classes, age-0 ABFT rely on a wide prey range, easily adapting their foraging behaviour to prey availability and distribution in the habitat. This research assesses the potential of using stable isotope techniques combined with SCA for the characterization of spatio-temporal variability in the diet of juvenile top predators.
机译：知道迁徙中上层捕食者在生命早期如何使用食物网资源对于了解人口动态和征募至关重要。使用胃内容物（SCA）和稳定同位素（SIA）调查了来自2个地中海近岸地区（卡塔赫纳和坎布里尔斯，西班牙）的大约3至4个月大的大西洋蓝鳍金枪鱼（ABFT）吞拿金枪鱼的摄食习惯，显示了明显的海洋学特征。分析。 SCA显示不同地区和年份之间的饮食差异；进一步的对应分析表明，表层鱼类（主要是cho鱼和沙丁鱼）构成了坎布里尔斯0岁ABFT的主要食物，而卡塔赫纳的ABFT大量消耗了中生鱼类（尤其是食肉类）和鱿鱼。组织（白肌肉和肝脏），面积和年份（2009年和2010年）之间的C-13值差异显着，而N-15值则无显着差异。在所有情况下，肌肉中的平均C-13值均明显高于肝脏，而在某些情况下，位置和年份之间的C-13值也存在差异。使用香农熵的对数exp（H）和稳定同位素贝叶斯椭圆SEA（c）估算营养位的利基宽度，表明来自坎布里尔斯的样品中的利基宽度通常比来自卡塔赫纳的样品更大。此外，SEA（c）分析表明，2010年的营养ni比2009年的营养ni更为广泛。我们的结果表明，喂养的专业化程度较低，并且表明，与年龄较大的班级一样，-0岁ABFT依赖广泛的猎物，因此很容易适应觅食行为以获取栖息地中的猎物并进行分配。这项研究评估了结合使用稳定同位素技术和SCA来表征幼年捕食者饮食中时空变异性的潜力。

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