Ontogenetic shift in diet and trophic role of Raja clavata inferred by stable isotopes and stomach content analysis in the Sea of Marmara.
Ontogenetic shift in diet and trophic role of Raja clavata inferred by stable isotopes and stomach content analysis in the Sea of Marmara.
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通过马尔马拉海稳定同位素和胃内容物分析推断 Raja clavata 的饮食和营养作用的个体发生变化。
DOI：
10.1111/jfb.15123
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发表时间：
2022
影响因子：
2
通讯作者：
N. Demirel
中科院分区：
文献类型：
--
作者：
Güzin Gül;N. Demirel
对捕食者-猎物相互作用的营养生态学研究揭示了对生态群落的洞察，并通过有助于改善渔业管理和养护能力，帮助理解物种在食物网中的角色。了解过度捕捞和濒危捕食者的生态作用对于破译它们的取食行为如何影响食物网动态至关重要。在这里，我们利用碳、氮稳定同位素和胃内容物分析，研究了普通和IUCN列入近受威胁(NT)刺背鱼的摄食行为。在过去的十年里，它最近遭受了马尔马拉海报告的捕获量下降了87%。这些结果表明，除夏季外，刺背鱼主要以硬骨鱼为食，两种方法都表明，通过胃内容物分析，该物种的食性发生了个体变化。这种个体发育饮食转变的长度为40-50厘米，通过改变群体偏好，从甲壳纲动物转向真骨动物。MixSIAR结果表明，棒尾轮虫的成体和幼体均以甲壳类为主要食性，但硬骨鱼的贡献以竹节鱼为代表。非常低(15%)。营养位置增加了总长度，高于马尔马拉海的其他蝙蝠类物种。这篇文章受版权保护。版权所有。
Trophic ecology studies on predator-prey interactions reveal insights into ecological communities and help understand a species' role in the food web by contributing to improved fisheries management and conservation capabilities. Understanding the ecological role of overexploited and endangered predators is essential to deciphering how their feeding behavior influences food web dynamics. Here, we investigated the feeding behavior of the common and IUCN-listed Near Threatened (NT) thornback ray Raja clavata, using carbon and nitrogen stable isotope and stomach content analysis. It has recently suffered an 87 % decline in reported catches from the Sea of Marmara within the last decade. These results show that thornback ray mainly feeds on teleost species, except in summer, with both methods showing this species changes its diet ontogenetically by stomach content analysis. This ontogenetic diet shift was at lengths 40-50 cm by changing group preferences from Crustacea to Teleostei. MixSIAR results showed that both adult and juvenile individuals of R. clavata feed mainly on the crustaceans, but the contribution of teleosts represented by Trachurus sp. was very low (<15%). The trophic position increased total length and was higher than other batoid species in the Sea of Marmara. This article is protected by copyright. All rights reserved.