Universidad Nacional Experimental de los Llanos Occidentales Ezequiel Zamora-UNELLEZ, San Fernando 7001, Apure, Venezuela.
J Fish Biol. 2013 May;82(5):1453-68. doi: 10.1111/jfb.12046. Epub 2013 Apr 12.
Using geometric morphometrics, the skull and otolith of tiger catfish Pseudoplatystoma metaense were analysed to identify population structure in tributaries of the Apure River (i.e. the Sarare, Caparo, Guanare, Portuguesa and San Carlos Rivers) in the Orinoco basin, Venezuela. The analyses show uniformity in skull and otolith shapes of P. metaense within and among four tributaries, with only the Caparo River showing significant differences. Within the Apure basin, the stock of P. metaense was differentiated through spawning, refuge and nursery areas. This study concludes that populations of P. metaense from each major tributary in the Orinoco basin should be considered as part of a metapopulation system for management purposes. Human disturbances in the catchment have directly reduced the spawning areas available to this species, decreased the total biomass and changed the spatial distribution of spawning areas.
利用几何形态测量学，对来自委内瑞拉奥里诺科河流域阿普雷河（即萨拉雷河、卡帕罗河、瓜纳雷河、葡萄牙河和圣卡洛斯河）的虎纹鸭嘴鲶的头骨和耳石进行了分析，以确定其种群结构。分析表明，在四条支流内和支流之间，P. metaense 的头骨和耳石形状具有一致性，只有卡帕罗河显示出显著差异。在阿普雷流域内，P. metaense 的种群通过产卵、避难和育幼区进行分化。本研究得出结论，奥里诺科河流域各主要支流的 P. metaense 种群应被视为管理目的下的复合种群系统的一部分。集水区的人为干扰直接减少了该物种可用的产卵区，降低了总生物量并改变了产卵区的空间分布。
