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首页> 外文期刊>Lakes & Reservoirs >Does reservoir age influence reproductive tactics in opportunistic fishes? An analysis of Astyanax minor reproduction in water supply reservoirs of southern Brazil
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Does reservoir age influence reproductive tactics in opportunistic fishes? An analysis of Astyanax minor reproduction in water supply reservoirs of southern Brazil

机译：水库年龄会影响机会鱼类的繁殖策略吗？巴西南部给水水库中非定殖繁殖的分析

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摘要

The goal of this study was to assess the reproductive tactics of the 'lambari tetra' (Astyanax minor) in two reservoirs of different age (Irai Reservoir = 5-6 years old; Passauna Reservoir = 17-18 years old), both being located in the same geographical region in southern Brazil. Sampling took place monthly from July 2006 to June 2007 in both reservoirs. Collected specimens were identified and their morphometric data measured. The gonads were macroscopically and microscopically analysed. Gonadosomatic Index (GSI) and condition factor results indicate there was a higher reproductive investment in Passauna Reservoir for both sexes, although with lower total condition. The occurrence of partially spawned ovaries allowed the characterization of partial spawning in both reservoirs. Higher growth rates and the largest individuals were found in Passauna Reservoir for both sexes, according to length-weight relationships and length class distributions. Significant seasonal sexual rate differences were only detected in Passauna Reservoir, with male predominance. Total length explained just a small fraction of GSI variability of mature females and males, supporting the hypothesis of local factor influence. It was concluded that this species uses distinct reproductive tactics in each of the two studied reservoirs and that these tactics seem to be reflective of environmental stability.
机译：这项研究的目的是评估两个位于不同年龄（伊莱水库= 5-6岁；帕萨纳水库= 17-18岁）的两个水库中的“小羊羔”的繁殖策略。在巴西南部的同一地理区域中。从2006年7月至2007年6月，每月在两个水库进行采样。确定收集的标本并测量其形态计量数据。对性腺进行了宏观和微观分析。性腺体能指数（GSI）和条件因素结果表明，尽管性别总体较低，但帕萨纳水库的两性生殖投资较高。部分产卵的卵巢的出现使得两个水库都有部分产卵的特征。根据身高体重关系和身长等级分布，在帕苏纳水库中发现了更高的增长率和最大的个体。仅在Passauna水库中发现了明显的季节性性别比率差异，其中男性居多。总长度仅解释了成年雌性和雄性GSI变异的一小部分，支持了局部因素影响的假设。结论是，该物种在两个研究过的水库中都使用了不同的繁殖策略，这些策略似乎反映了环境的稳定性。

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  • 来源
    《Lakes & Reservoirs》 |2013年第3期|247-258|共12页
  • 作者

    Elton C. Oliveira; Adriane E. Muelbert; Juliano P. A. Silva; Nedia C. Ghisi; Luis F. Favaro;

  • 作者单位

    Coordenacao de Engenharia Ambiental da Universidade Tecnologica Federal do Parana (UTFPR), Campo Mourao;

    Programa de Pos-Graduacao em Ecologia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre;

    Fundacao Nacional do Indio (FUNAI) do estado do Tocantins, Palmas;

    Programa de Pos-Graduacao em Ecologia de Ambientes Aquaticos Continentais, Universidade Estadual de Maringa (UEM), Maringa and;

    Laboratorio de Reproducao e Comunidade de Peixes, Setor de Ciencias Biologicas, Universidade Federal do Parana (UFPR), Curitiba, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    condition factor; maturation curve; reproductive cycle; sexual rate;

    机译：条件因素成熟曲线生殖周期性比率;

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