地中海西部大西洋蓝鳍金枪鱼幼鱼的长期营养生态学

IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY
Mar Pardo , Fernando Á. Fernández-Álvarez , José Luis Varela , Joan Navarro , Antonio Medina , María José Gómez-Vives , Valerio Sbragaglia , Jose María Bellido , Marta Coll , Joan Giménez
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引用次数: 0

摘要

全球海洋生态系统面临着越来越大的人为压力,如过度捕捞、污染、栖息地退化和气候变化,导致鱼类数量下降。大西洋蓝鳍金枪鱼;Thunnus thynus)是一种生态上重要的顶级掠食者,历史上一直遭受过度开发。近年来,人们采取了保护措施来减缓其数量的下降,使其种群数量有所恢复。在地中海西部,围网渔民开始关注ABFT重新出现对沙丁鱼(Sardina pilchardus)和凤尾鱼(Engraulis encrasicolus)种群的潜在影响,这些种群是ABFT和渔业的重要猎物,目前被过度捕捞或种群生物量水平较低。本研究对1989年、2012-2014年和2018-2019年三个时期西地中海瓦伦西亚湾ABFT幼鱼的营养生态学进行了研究。通过胃内容物分析和稳定同位素分析相结合,两者相辅相成,我们的目标是实现对营养生态学的全面了解。ABFT的饮食偏好是灵活和机会主义的,包括多种猎物,包括鱼类,头足类和甲壳类动物。幼鱼饮食组成的变化可归因于猎物可得性的波动,这主要是由于过度捕捞和气候变化的协同效应。可能是为了应对沙丁鱼和凤尾鱼数量的减少,幼ABFT已经改变了它们的饮食习惯,减少了对这些物种的摄入,增加了对马鲛鱼(Trachurus spp.)的摄入,马鲛鱼是地中海西部的另一种远洋掠食性鱼类。我们的数据表明,渔民对沙丁鱼和凤尾鱼被不断增加的ABFT种群消耗的担忧是不支持的,至少对于幼鱼个体来说是不支持的。了解ABFT的营养关系和摄食动态具有更广泛的意义,可以为生态系统恢复力、捕食者-猎物相互作用以及对环境变化的适应性反应提供见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Long-term trophic ecology of juvenile Atlantic bluefin tuna in the western mediterranean sea
Global marine ecosystems confront increasing anthropogenic pressures, such as overfishing, pollution, habitat degradation, and climate change, leading to declining fish populations. Atlantic bluefin tuna (ABFT; Thunnus thynnus), an ecologically important apex predator, has historically suffered from overexploitation. Conservation efforts have been implemented to mitigate its decline, leading to a recovery of its stock in recent years. In the western Mediterranean Sea, concerns have emerged among purse seine fishers regarding the potential impact of the resurgence of ABFT on sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus) populations, crucial prey for ABFT and the fishing industry, and currently overexploited or with low population biomass levels. This study investigates the trophic ecology of juvenile ABFT in the Gulf of Valencia, western Mediterranean Sea, across three periods: 1989, 2012–2014, and 2018–2019. Through a combination of stomach content analysis and stable isotope analysis, which complement each other, we aim at achieving a comprehensive understanding of the trophic ecology. ABFT's dietary preferences are revealed as flexible and opportunistic, encompassing a diversity of prey species, including fish, cephalopods, and crustaceans. Variations in the composition of the diet of juvenile ABFT can be attributed to fluctuations in the availability of prey, mainly due to a synergistic effect of overfishing and climate change. Likely in response to declining populations of sardine and anchovy, juvenile ABFT have changed their dietary habits, decreasing their consumption of these species and increasing their ingestion of horse mackerels (Trachurus spp.), another pelagic predatory fish present in the western Mediterranean Sea. Our data suggest that concerns of fishers regarding the consumption of sardine and anchovy by the increasing ABFT population are not supported, at least for juvenile individuals. Understanding the trophic relationships and feeding dynamics of ABFT has wider implications, and can provide insights into ecosystem resilience, predator-prey interactions, and adaptative responses to changing environments.
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来源期刊
CiteScore
5.60
自引率
7.10%
发文量
374
审稿时长
9 months
期刊介绍: Estuarine, Coastal and Shelf Science is an international multidisciplinary journal devoted to the analysis of saline water phenomena ranging from the outer edge of the continental shelf to the upper limits of the tidal zone. The journal provides a unique forum, unifying the multidisciplinary approaches to the study of the oceanography of estuaries, coastal zones, and continental shelf seas. It features original research papers, review papers and short communications treating such disciplines as zoology, botany, geology, sedimentology, physical oceanography.
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