Beyond just a dam blockage problem: larger artificial reservoirs are additional obstacles to reproductive fish migration in the Neotropics

IF 1.4 4区 环境科学与生态学 Q3 ECOLOGY
João de Magalhães Lopes, Carlos Bernardo Mascarenhas Alves, Fernanda de Oliveira Silva, Paulo Santos Pompeu
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Abstract

One of the most conspicuous impacts of dam construction on fish is the blocking of their migratory routes. However, the formation of the reservoir, a lentic environment with distinct hydrological and ecological characteristics, can also constitute an obstacle to migration. This impact, however, is poorly explored in the scientific literature. Therefore, this study aimed to assess the movements of Prochilodus argenteus tagged with radio telemetry transmitters and manually translocated across the Três Marias Dam in the São Francisco River. The Três Marias reservoir covers an area of 1090 km2 and ranks among the largest artificial reservoirs in Brazil. Individuals translocated to the Três Marias reservoir showed reduced movement rates and home ranges. They appeared disoriented in the new environment, with many of them settling near fish farms and remaining there throughout the study period. A comparative analysis with existing literature on Neotropical species’ reproductive migration through artificial reservoirs revealed a trend: the ability of migratory fish to navigate reservoirs diminishes with their area, especially those exceeding 50 km2 or with a residence time surpassing 30 days. These results indicate that caution is needed when designing fish passage facilities for dams that form larger artificial reservoirs in the Neotropics. Even if these facilities are efficient in attracting and translocating migratory species, behavioral and physiological thresholds may prevent them from reaching suitable areas to complete their reproductive cycle in the new environment formed.

Abstract Image

不仅仅是水坝堵塞问题:大型人工水库是新热带地区鱼类繁殖洄游的额外障碍
水坝建设对鱼类最明显的影响之一是阻断了它们的洄游路线。然而,水库是一种具有独特水文和生态特征的泻湖环境,它的形成也会对洄游构成障碍。然而,科学文献中对这一影响的探讨却很少。因此,本研究旨在评估用无线电遥测发射器标记并人工转移越过圣弗朗西斯科河Três Marias大坝的Prochilodus argenteus的活动情况。Três Marias水库占地1090平方公里,是巴西最大的人工水库之一。被转移到Três Marias水库的个体的移动速度和家园范围都有所下降。它们在新环境中显得无所适从,其中许多在养鱼场附近定居,并在整个研究期间一直留在那里。与现有关于新热带物种通过人工水库进行生殖洄游的文献进行比较分析后发现了一个趋势:洄游鱼类在水库中的航行能力随着水库面积的增加而减弱,尤其是那些面积超过50平方公里或停留时间超过30天的水库。这些结果表明,在为新热带地区形成较大型人工水库的大坝设计鱼类通道设施时需要谨慎。即使这些设施能有效地吸引和转移洄游鱼种,但行为和生理阈值可能会阻止它们到达合适的区域,在形成的新环境中完成繁殖周期。
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来源期刊
Environmental Biology of Fishes
Environmental Biology of Fishes 环境科学-海洋与淡水生物学
CiteScore
2.60
自引率
14.30%
发文量
169
审稿时长
3 months
期刊介绍: Environmental Biology of Fishes is an international journal that publishes original studies on the ecology, life history, epigenetics, behavior, physiology, morphology, systematics and evolution of marine and freshwater fishes. Empirical and theoretical papers are published that deal with the relationship between fishes and their external and internal environment, whether natural or unnatural. The journal concentrates on papers that advance the scholarly understanding of life and draw on a variety of disciplines in reaching this understanding. Environmental Biology of Fishes publishes original papers, review papers, brief communications, editorials, book reviews and special issues. Descriptions and submission requirements of these article types can be found in the Instructions for Authors.
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