Identifying priority areas using a multispecies approach for the conservation of marine megafauna species vulnerable to bycatch in commercial gillnet fisheries

IF 3 2区环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Biodiversity and Conservation Pub Date : 2024-01-10 DOI:10.1007/s10531-023-02748-y

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引用次数: 0

Abstract

Bycatch is one of the main causes of mortality among marine megafauna around the world. In the coastal waters of southern Brazil, bycatch in gillnet fisheries affects threatened species that use this region as a breeding and feeding area. The identification of hotspot areas of bycatch is necessary to design and prioritize efficient spatial–temporal closures that protect the largest possible number of threatened species of marine megafauna. In this context, the use of a multispecies approach is an important step towards planning effective fisheries management measures. This study has two main objectives: (1) to identify hotspot areas of bycatch in gillnet fisheries for the most threatened marine megafauna species on the continental shelf of Rio Grande do Sul (RS); (2) compare single species and multispecies mapping methods for the identification of these areas. To meet these objectives, data collected by onboard observers during fishing trips in the coastal commercial RS-based gillnet fleet between 2013 and 2015 and between 2018 and 2020 were analyzed. For the identification of the areas, hierarchical Bayesian spatio-temporal models were implemented, using monospecific and multispecific approaches and a weighting system for the conservation status of the species. Both approaches provide similar results, identifying three bycatch hotspots according to the time frame analysed. Based on our findings, we propose these areas as the top candidates for fishing exclusion zones, based on their biodiversity value. The suggested spatio-temporal closures would benefit several endangered species while also contributing to the recovery of fish populations.

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利用多物种方法确定优先区域，以保护易被商业刺网渔业误捕的海洋巨型动物物种

摘要兼捕是造成世界各地海洋巨型动物死亡的主要原因之一。在巴西南部沿海水域，刺网渔业的兼捕渔获物影响到将该区域作为繁殖和觅食区的受威胁物种。有必要确定副渔获物的热点区域，以便设计高效的时空禁渔区并确定其优先次序，从而保护尽可能多的受威胁海洋巨型动物物种。在这种情况下，采用多物种方法是规划有效渔业管理措施的重要一步。本研究有两个主要目标：(1) 识别南里奥格兰德州（Rio Grande do Sul，RS）大陆架上最受威胁的海洋巨型动物物种在刺网渔业中副渔获物的热点区域；(2) 比较单一物种和多物种绘图方法来识别这些区域。为实现这些目标，分析了船上观察员在 2013 年至 2015 年以及 2018 年至 2020 年期间南大河沿岸商业刺网船队捕鱼期间收集的数据。为确定区域，采用了分层贝叶斯时空模型，使用了单特异性和多特异性方法以及物种保护状况加权系统。两种方法得出的结果相似，根据分析的时间框架确定了三个混获热点。根据我们的研究结果，我们建议根据这些区域的生物多样性价值将其作为禁渔区的首选区域。建议的时空禁渔区将使多个濒危物种受益，同时也有助于鱼类种群的恢复。

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来源期刊

Biodiversity and Conservation 环境科学-环境科学

CiteScore

6.20

自引率

5.90%

发文量

153

审稿时长

9-18 weeks

期刊介绍： Biodiversity and Conservation is an international journal that publishes articles on all aspects of biological diversity-its description, analysis and conservation, and its controlled rational use by humankind. The scope of Biodiversity and Conservation is wide and multidisciplinary, and embraces all life-forms. The journal presents research papers, as well as editorials, comments and research notes on biodiversity and conservation, and contributions dealing with the practicalities of conservation management, economic, social and political issues. The journal provides a forum for examining conflicts between sustainable development and human dependence on biodiversity in agriculture, environmental management and biotechnology, and encourages contributions from developing countries to promote broad global perspectives on matters of biodiversity and conservation.