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首页> 外文期刊>Aquatic Biology >Downstream impacts of a dam and influence of a tributary on the reproductive success of Leporinus reinhardti in S?o Francisco River
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Downstream impacts of a dam and influence of a tributary on the reproductive success of Leporinus reinhardti in S?o Francisco River

机译：大坝的下游影响和支流对索弗朗西斯科河的雷波里努斯·莱因哈蒂（Leporinus reinhardti）繁殖成功的影响

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ABSTRACT: Downstream impacts of dams on fish fauna are poorly studied, despite causing thermal and hydrological changes that affect the reproductive activity of the fish community. The present study aims to evaluate the reproduction of Leporinus reinhardti in 2 sections of the S?o Francisco River, Brazil, downstream from the Três Marias Dam. Section 1 (S1) is the first 34 km downstream from Três Marias Dam and section 2 (S2) is 34 to 54 km downstream from the dam, where the S?o Francisco River receives a mid-sized tributary called the Abaeté River. In S1, the values of temperature, dissolved oxygen and flow were lower than those obtained in S2. In S1, females and males did not complete reproduction, a fact proven by the absence of spawned females and males. In S2, reproductive success was proven due to the presence of spawned females and males. Furthermore, the values of total length, body weight, gonadosomatic index, fecundity and vitellogenic oocytes were statistically higher than those obtained in S1. The canonical correlation test indicated that the reproduction of females is more dependent on environmental factors than that of males. In S2, L. reinhadti found appropriate conditions for reproduction, probably influenced by the Abaeté River, confirming the need of preserving this tributary for the reproductive success of this species.
机译：摘要：尽管大坝对鱼类的下游影响没有受到影响，尽管造成了热和水文变化，从而影响了鱼类群落的繁殖活动。本研究旨在评估TrêsMarias大坝下游巴西圣弗朗西斯科河两段的 Leporinus reinhardti 的繁殖。第一节（S1）是TrêsMarias大坝下游的第一个34公里，第二节（S2）是大坝下游的34至54公里，在那里，圣弗朗西斯科河接收一条称为Abaeté河的中型支流。在S1中，温度，溶解氧和流量的值低于在S2中获得的值。在S1中，雌性和雄性都没有完成繁殖，事实是没有雌性和雄性产卵。在S2中，由于存在产卵的雌性和雄性，证明了繁殖成功。此外，总长度，体重，性腺机能指数，生殖力和卵黄卵母细胞的值在统计学上高于S1中获得的值。典范的相关性测试表明，雌性的繁殖比雄性更依赖环境因素。在S2中， L。 reinhadti 发现了可能受阿拜特河（AbaetéRiver）影响的适宜繁殖条件，从而确认了为保护该物种的繁殖成功而需要保存此支流的必要条件。

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