Restricted genetic connectivity and conservation prospects of Bagrid catfish, Bagrus orientalis, populations in the Rufiji River basin, Tanzania

IF 2 3区农林科学 Q2 FISHERIES

Fisheries Management and Ecology Pub Date : 2024-01-19 DOI:10.1111/fme.12686

Jackson L. Saiperaki, Silvia F. Materu, Prisila A. Mkenda, Elly J. Ligate, Cyrus Rumisha

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引用次数: 0

Abstract

The Bagrid catfish, Bagrus orientalis, historically sustained communities in the Rufiji River basin (RRB), Tanzania, but has rapidly declined due to high consumer demand and unsustainable fishing. Consequently, a Ramsar site was designated within the RRB, although its potential to revitalize overexploited populations beyond its boundaries is uncertain because of limited information on genetic connectivity. To address this uncertainty, 158 partial cytochrome oxidase subunit I sequences of B. orientalis were analyzed to quantify genetic connectivity in the RRB. We observed significant genetic differentiation, indicating limited connectivity among populations. Populations in the Ramsar site were genetically connected to those in the Kilombero Valley Floodplain (KVFP), but were distinct from those in Ruaha and Rufiji, which clustered separately. Our findings suggested the Ramsar site could revitalize overexploited KVFP populations, and emphasized the need for sustained efforts against its encroachment. However, limited genetic connectivity with Ruaha and Rufiji implied that conservation measures in the site might have restricted effect in these areas. Conservation efforts should extend beyond the Ramsar site, by promoting sustainable fishing and enhancing habitat connectivity in Ruaha and Rufiji.

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坦桑尼亚 Rufiji 河流域 Bagrid 鲶鱼种群受限的遗传连接性和保护前景

巴氏鲶鱼（Bagrus orientalis）在历史上曾支撑着坦桑尼亚鲁菲济河流域（RRB）的社区，但由于消费者的高需求和不可持续的捕鱼方式，该物种已迅速减少。因此，该流域内被指定为拉姆萨尔湿地，但由于基因连接方面的信息有限，该湿地能否振兴其边界外过度开发的种群尚不确定。为了解决这一不确定性，我们分析了 158 个东方鲣鱼部分细胞色素氧化酶亚单位 I 序列，以量化 RRB 中的遗传连通性。我们观察到了明显的遗传分化，这表明种群之间的连通性有限。拉姆萨尔地区的种群与基隆贝罗河谷洪泛平原（KVFP）的种群存在遗传联系，但与鲁阿哈和鲁菲济的种群不同，它们分别聚居在不同的地方。我们的研究结果表明，拉姆萨尔湿地可以使过度开发的基隆贝罗河谷洪泛平原种群恢复活力，并强调了持续努力防止其侵蚀的必要性。然而，与鲁阿哈和鲁菲济之间有限的遗传连接意味着，拉姆萨尔湿地的保护措施对这些地区的影响可能有限。保护工作应扩展到拉姆萨尔湿地以外的地区，促进可持续渔业，加强鲁阿哈和鲁菲吉的生境连接。

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来源期刊

Fisheries Management and Ecology 农林科学-渔业

CiteScore

3.80

自引率

5.00%

发文量

审稿时长

12-24 weeks

期刊介绍： Fisheries Management and Ecology is a journal with an international perspective. It presents papers that cover all aspects of the management, ecology and conservation of inland, estuarine and coastal fisheries. The Journal aims to: foster an understanding of the maintenance, development and management of the conditions under which fish populations and communities thrive, and how they and their habitat can be conserved and enhanced; promote a thorough understanding of the dual nature of fisheries as valuable resources exploited for food, recreational and commercial purposes and as pivotal indicators of aquatic habitat quality and conservation status; help fisheries managers focus upon policy, management, operational, conservation and ecological issues; assist fisheries ecologists become more aware of the needs of managers for information, techniques, tools and concepts; integrate ecological studies with all aspects of management; ensure that the conservation of fisheries and their environments is a recurring theme in fisheries and aquatic management.