The main channel and river confluences as spawning sites for migratory fishes in the middle Uruguay River

IF 2 4区生物学 Q1 ZOOLOGY

Neotropical Ichthyology Pub Date : 2022-01-01 DOI:10.1590/1982-0224-2021-0094

M. L. G. Soares, M. V. Massaro, P. B. Hartmann, Samuel Elias Siveris, F. Pelicice, D. Reynalte‐Tataje

{"title":"The main channel and river confluences as spawning sites for migratory fishes in the middle Uruguay River","authors":"M. L. G. Soares, M. V. Massaro, P. B. Hartmann, Samuel Elias Siveris, F. Pelicice, D. Reynalte‐Tataje","doi":"10.1590/1982-0224-2021-0094","DOIUrl":null,"url":null,"abstract":"Abstract Evidence indicates that migratory fish reproduce in the middle Uruguay River, but the location of spawning sites remains unknown. To identify spawning sites in the basin, fish eggs and larvae were sampled monthly between October 2016 and January 2017. The sampling was carried out in three sections along the middle Uruguay River, covering two environments: the main channel and the mouth of tributaries (Comandaí, Ijuí, and Piratinim rivers). A total of 11,519 eggs and 3,211 larvae were captured, belonged to ten migratory species. Eggs and larvae of migratory fishes, were widely distributed, with predominance of segmented eggs, and larvae in yolk-sac and pre-flexion stages, with higher densities near the confluence with the Piratinim River. Larvae assemblages showed spatial variation, indicating that spawning sites differ among migratory species. This study provides new information about fish reproduction in the middle Uruguay River, revealing that migratory species spawn in different localities along the main channel and tributaries. This region may function as a critical site for fish reproduction, although it is currently threatened by the risk of hydropower expansion, emphasizing the need for measures that preserve their environmental conditions, hydrological connectivity and ecological functions.","PeriodicalId":19103,"journal":{"name":"Neotropical Ichthyology","volume":"1 1","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Neotropical Ichthyology","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1590/1982-0224-2021-0094","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ZOOLOGY","Score":null,"Total":0}

引用次数: 2

Abstract

Abstract Evidence indicates that migratory fish reproduce in the middle Uruguay River, but the location of spawning sites remains unknown. To identify spawning sites in the basin, fish eggs and larvae were sampled monthly between October 2016 and January 2017. The sampling was carried out in three sections along the middle Uruguay River, covering two environments: the main channel and the mouth of tributaries (Comandaí, Ijuí, and Piratinim rivers). A total of 11,519 eggs and 3,211 larvae were captured, belonged to ten migratory species. Eggs and larvae of migratory fishes, were widely distributed, with predominance of segmented eggs, and larvae in yolk-sac and pre-flexion stages, with higher densities near the confluence with the Piratinim River. Larvae assemblages showed spatial variation, indicating that spawning sites differ among migratory species. This study provides new information about fish reproduction in the middle Uruguay River, revealing that migratory species spawn in different localities along the main channel and tributaries. This region may function as a critical site for fish reproduction, although it is currently threatened by the risk of hydropower expansion, emphasizing the need for measures that preserve their environmental conditions, hydrological connectivity and ecological functions.

查看原文本刊更多论文

主河道和河流汇合处为乌拉圭河中部洄游鱼类的产卵地

有证据表明，洄游鱼类在乌拉圭河中部繁殖，但产卵地点的位置尚不清楚。为了确定该盆地的产卵地点，2016年10月至2017年1月期间每月取样鱼卵和幼虫。采样在乌拉圭河中游的三个河段进行，涵盖两种环境:主河道和支流(Comandaí、Ijuí和Piratinim河)入海口。共捕获卵11519只，幼虫3211只，分属10个迁徙种。洄游鱼类的卵和幼虫分布广泛，以分段卵为主，幼虫处于卵囊期和前屈曲期，在靠近皮拉蒂尼姆河汇合处密度较高。幼虫组合存在空间差异，表明不同迁徙物种的产卵地点不同。这项研究为乌拉圭河中游鱼类的繁殖提供了新的信息，揭示了洄游物种在主河道和支流的不同位置产卵。该地区可能成为鱼类繁殖的重要场所，尽管目前受到水电扩建风险的威胁，强调需要采取措施保护其环境条件，水文连通性和生态功能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Neotropical Ichthyology 生物-动物学

CiteScore

2.80

自引率

17.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Neotropical Ichthyology is the official journal of the Sociedade Brasileira de Ictiologia (SBI). It is an international peer-reviewed Open Access periodical that publishes original articles and reviews exclusively on Neotropical freshwater and marine fishes and constitutes an International Forum to disclose and discuss results of original research on the diversity of marine, estuarine and freshwater Neotropical fishes. -Frequency: Four issues per year published only online since 2020, using the ‘rolling pass’ system, which posts articles online immediately as soon as they are ready for publication. A searchable and citable Digital Object Identifier (DOI) is assigned to each article immediately after online publication, with no need to await the issue’s closing. -Areas of interest: Biology, Biochemistry and Physiology, Ecology, Ethology, Genetics and Molecular Biology, Systematics. -Peer review process: The Editor-in-Chief screens each manuscript submitted to Neotropical Ichthyology to verify whether it is within the journal’s scope and policy, presents original research and follows the journal’s guidelines. After passing through the initial screening, articles are assigned to a Section Editor, who then assigns an Associate Editor to start the single blind review process.