迁徙鱼在一个由大调节的新热带安第斯盆地在哪里产卵?
Kelly Rivera-Coley1, David Augusto Reynalte-Tataje2, Víctor Atencio-Garcia3
1Department of Biology, Ichthyology Group of the Universidad de Antioquia, Universidad de Antioquia, Medellín, Antioquia, Colombia.
PloS one
|October 19, 2023
概括
尼奇河是马格达莱纳河流域迁徙鱼类的关键产卵场. 鱼类浮游生物密度随着距离Porse III大的距离而增加,这凸显了不受干扰的洪水平原对鱼类繁殖的重要性.
科学领域:
- 鱼类学和水生生态学
- 河流生态系统 河流生态系统
- 保护生物学 保护生物学
背景情况:
- 繁殖地点对于鱼群持续存在至关重要.
- 尼奇河是马格达莱纳河流域内形物种的关键产卵区.
- 堤建设对这些关键息地构成重大威胁.
研究的目的:
- 评估内希河作为鱼繁殖场所的重要性.
- 了解与环境因素相关的鱼类浮游生物的分布和密度.
- 评估水电开发对鱼类繁殖的影响.
主要方法:
- 在七个地点从低水到高水季度 (2018-2019) 过渡期间采集 Ichthyoplankton 样本.
- 鱼类幼虫和后幼虫阶段的识别和密度计算.
- 分析浮游生物丰富度的空间和时间变化.
- 鱼类浮游生物的存在与轮水体积之间的相关性分析.
主要成果:
- 平均肉质浮游生物密度为42.4个体/10m3.3.
- 确定了七种迁徙鱼类和两个额外的类型,其中*Prochilodus magdalenae*,*Megaleporinus muyscorum*和*Pseudoplatystoma magdaleniatum*是最丰富的.
- 波塔莫德罗姆物种的幼虫密度峰值发生在2019年高水季初.
- 胚胎和虫幼虫频率的显著差异与采样地点,高水季节和幼虫后密度有关.
- 从产卵区的平均漂移距离约为52.1公里.
- 在Porce III水电厂下游的Porce河的地点,在轮发电水量和鱼类浮游生物的存在之间观察到一个积极的关联.
结论:
- 尼奇河被证实是形鱼的重要产卵地.
- 鱼类浮游生物密度似乎随着距离Porse III大的距离而增加.
- 洪水平原的存在对于支持更高的浮游生物密度至关重要,这表明需要在受大影响的河流系统中保护息地.
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