Ichthyoplankton dynamics in the Brazilian Pantanal: Contribution of an important tributary and maintenance of connectivity

IF 1.6 3区农林科学 Q3 FISHERIES

Ecology of Freshwater Fish Pub Date : 2024-07-24 DOI:10.1111/eff.12808

Mateus Babichi Veiga de Souza, Karina Keyla Tondato-Carvalho, A. Bialetzki

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Abstract

In order to investigate the reproductive dynamics of the ichthyofauna in the Brazilian Pantanal, this study examines the spatial and temporal distribution of ichthyoplankton, taxonomic composition, and its correlation with environmental factors within one of the most important sub‐basins, the Taquari River. Egg and larvae collections were conducted at 11 sampling points between October and March of 2017/2018 and 2018/2019. Significant differences were observed between collection points, months, and years, with higher ichthyoplankton densities in the Coxim and Taquari rivers, particularly between November and January. Twenty‐eight genera and/or species of fish were identified, including 10 long‐distance migratory species. Egg density showed a negative correlation with water temperature and rainfall. For larvae, water transparency and rainfall were both significant, negatively influencing larval abundance. However, different species tend to occur in environments with distinct abiotic qualities. Yolk‐sac, preflexion, and flexion larval development stages were distributed throughout the sub‐basin, especially near the Pantanal. Considering the data and analyses presented in this study, the importance of connectivity between these environments, specifically between the plateau and Pantanal, is evident, highlighting the significance of the entire sub‐basin for fish reproductive processes. Therefore, research focusing on the ecological processes influencing the distribution of ichthyoplankton offers valuable insights for ecosystem conservation and aids in effective environmental management.

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巴西潘塔纳尔的浮游鱼类动态：一条重要支流的贡献和连通性的维持

为了研究巴西潘塔纳尔地区鱼类动物的繁殖动态，本研究考察了鱼类浮游生物的时空分布、分类组成及其与最重要的子流域之一塔夸里河内环境因素的相关性。2017/2018 年和 2018/2019 年 10 月至 3 月期间，在 11 个采样点进行了鱼卵和幼虫采集。采集点、月份和年份之间存在显著差异，Coxim河和Taquari河的鱼类浮游生物密度较高，尤其是在11月至次年1月期间。共鉴定出 28 个鱼属和/或鱼种，包括 10 个远距离洄游鱼种。鱼卵密度与水温和降雨量呈负相关。就幼虫而言，水的透明度和降雨量都对幼虫数量有显著的负面影响。然而，不同物种往往出现在具有不同非生物质量的环境中。卵黄囊、前屈和屈曲幼虫发育阶段分布在整个分流域，尤其是在潘塔纳尔附近。从本研究提供的数据和分析结果来看，这些环境之间，特别是高原和潘塔纳尔之间的连接性的重要性是显而易见的，凸显了整个次盆地对鱼类繁殖过程的重要性。因此，以影响鱼类浮游生物分布的生态过程为重点的研究为生态系统保护提供了宝贵的见解，并有助于有效的环境管理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ecology of Freshwater Fish 农林科学-海洋与淡水生物学

CiteScore

4.10

自引率

0.00%

发文量

审稿时长

12-24 weeks

期刊介绍： Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.

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