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首页> 外文期刊>Estuarine Coastal and Shelf Science >Evaluation of the comprehensive feeding strategy and trophic role of overexploited mesopredator species in the Sea of Marmara (northeastern Mediterranean)
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Evaluation of the comprehensive feeding strategy and trophic role of overexploited mesopredator species in the Sea of Marmara (northeastern Mediterranean)

机译：在马尔马拉（东北地中海东北地中海）中过度消除的中间粒子种类综合喂养策略和营养途径的评价

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Mesopredator species play an essential role in balancing and sustaining ecosystems through their interactions with various species and with their habitats. In ecosystems that have been subjected to overfishing, it is essential to obtain information on the trophic ecology of such predators. Based on this motivation, this study aimed to investigate the feeding strategies and trophic roles of four demersal sharks (e.g., Mustelus mustelus, Mustelus asterias, Squalus acanthias, and Scyliorhinus canicula) by analyzing their stomach contents and using stable isotope (delta 13C and delta 15N) analysis. These shark species are subject to overfishing, and their landings have decreased by 98% over the last 18 years in the Sea of Marmara. The results demonstrated that interspecific differences in the main prey resources exist among those sharks. Mustelus mustelus and Mustelus asterias feed mainly on crustaceans, and their diets are very similar. However, Mustelus asterias utilizes a specialist feeding strategy while Mustelus mustelus utilizes a medium-state generalist strategy. Squalus acanthias occupies a high trophic level and mainly feeds on teleosts over both short and long time scales. The probability of isotopic niche overlap of Scyliorhinus canicula with the isotopic niches of S. acanthias was the highest (70.7%), which indicates that both species exploit similar food resources within the same environment. These results contribute to the knowledge of the ecological role of these highly vulnerable cartilaginous species and may help to improve conservation programs in the Sea of Marmara, a lesser-known part of the northeast Mediterranean.
机译：化学药剂物种通过与各种物种的互动和栖息地在平衡和维持生态系统方面发挥着重要作用。在经过过度捕捞的生态系统中，必须获得有关此类捕食者的营养生态学的信息。基于这种动机，本研究旨在通过分析其胃内容物和使用稳定的同位素（Delta 13c和delta 15N）分析。这些鲨鱼物种受到过度捕捞的影响，在马尔马拉海的过去18年中，他们的着陆减少了98％。结果表明，这些鲨鱼中存在主要猎物资源的差异。 Mustelus Mustelus和Mustelus Asterias主要饲养甲壳类动物，他们的饮食非常相似。然而，Mustelus Asterias利用专家喂养策略，而Mustelus Mustelus利用中状态通用策略。 Squalus acanthias占据高营养水平，主要在短期和长期尺度上源于TextoSts。 Scyliorhinus canicula与S.Acanthias同位素的IntoTopic Niche重叠的概率最高（70.7％），这表明这两种物种都利用了同一环境中的类似食物资源。这些结果有助于了解这些高度脆弱的软血石物种的生态作用，并有助于改善马尔马拉海洋的保护计划，是东北地中海的鲜为人知的一部分。

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