Facultad de Ciencias Universidad Nacional de Colombia-Sede Medellín, Laboratorio de Biología Molecular y Celular, Escuela de Biociencias, Medellín, Antioquia, Colombia.
PLoS One. 2024 Apr 18;19(4):e0301577. doi: 10.1371/journal.pone.0301577. eCollection 2024.
The striped catfish Pseudoplatystoma magdaleniatum is a large-sized migratory species from the north Andes region, endemic to Magdalena basin and one of the major fishery resources. Despite the estimated reduction of over 80% of the fisheries production of this species throughout the basin in recent decades, its population in the lower Magdalena-Cauca basin showed healthy genetics after molecular analyses. However, the current conservation status of this species and several habitat disturbances demand the re-evaluation of its population genetics to infer evolutionary risks and assess potential changes. This work analyzed a total of 164 samples from the Cauca River collected downstream the Ituango Dam between 2019-2021 using species-specific microsatellite markers to compare the genetic diversity and structure in samples collected between 2010-2014 from the lower Magdalena-Cauca basin, previously analyzed. Our results showed a relatively stable panmictic population over time (4 to 10 years), with high genetic diversity and evidence of recent bottleneck. Promoting habitat connectivity to conserve gene flow, characterizing diversity and genetic structure over the entire basin, and integrating the results with future monitoring are important aspects for the management planning for P. magdaleniatum in the Magdalena-Cauca basin.
湄公河鲇 Pseudoplatystoma magdaleniatum 是一种来自北安第斯山脉地区的大型洄游物种，特生于 Magdalena 流域，是主要的渔业资源之一。尽管在过去几十年里，该物种在整个流域的渔业产量估计减少了 80%以上，但分子分析显示，在 Magdalena-Cauca 流域下游，其种群的遗传状况仍然良好。然而，该物种目前的保护状况和多种生境干扰要求重新评估其种群遗传学，以推断进化风险并评估潜在的变化。这项工作共分析了 2019 年至 2021 年期间在伊图ango 大坝下游采集的来自 Cauca 河的 164 个样本，使用特定于物种的微卫星标记来比较 2010 年至 2014 年期间在 Magdalena-Cauca 流域下游采集的样本的遗传多样性和结构，这些样本之前已经进行了分析。我们的结果表明，该种群在 4 到 10 年的时间内相对稳定，具有较高的遗传多样性和近期瓶颈的证据。促进生境连通性以保护基因流动，对整个流域的多样性和遗传结构进行特征描述，以及将结果与未来的监测相结合，这些都是 Magdalena-Cauca 流域管理规划中保护 P. magdaleniatum 的重要方面。
