Abstract (en):
The Paria Gulf Basin ichthyofauna comprises 218 species arranged in 14 orders and 50 families. Among these, 155 species are considered strictly freshwater and 63 species are euryhaline. The most representative orders were Characiformes (67 sp.) and Siluriformes (59 sp.), followed by the Perciformes (52 sp.), Cyprinodontiformes (9 sp.) and a miscellany of ten more orders that contain the remaining species. The family Characidae with 45 species (21.3 %) was the most diverse followed by the families Cichlidae with 20 species (9.5 %) and Loricariidae with 17 species (8.1 %). A list of the species is presented including habits and river system distribution. Four endemic species, Bryconamericus yokiae, Creagrutus hysginus, Chaetostoma venezuelae and Farlowella venezuelensis was found. The analyses of faunal similarity showed that the Paria gulf basin ichthyofauna shares almost all the species with the Orinoco basin. On the other hand, the presence of at least four endemic species seem to indicate that the Paria gulf basin represents a noteworthy biogeographyic area with an own evolutionary history. These aspects and the role of the Orinoco river delta on the fish species dispersion are discussed.
Abstract (es):
La ictiofauna de la cuenca del golfo de Paria está integrada por 218 especies agrupadas en 14 órdenes y 50 familias. De estas, 155 especies son consideradas dulceacuícolas estrictas y 63 especies son eurihalinas. Los órdenes más representativos fueron Characiformes (67 sp.) y Siluriformes (59 sp.), seguidos por los Perciformes (52 sp.), Cyprinodontiformes (9 sp.) y una miscelánea de diez órdenes más, que agrupan a las especies restantes. La familia Characidae con 45 especies (21,3 %) fue la más diversa. Le siguen en importancia de riqueza específica las familias Cichlidae con 20 especies (9,5 %) y Loricariidae con 17 especies (8,1 %). Se presenta una lista general de las especies y su distribución por tipo de ambiente y subcuencas. Existen por lo menos cuatro especies endémicas Bryconamericus yokiae, Creagrutus hysginus, Chaetostoma venezuelae y Farlowella venezuelensis. Los análisis de similitud faunística mostraron que la ictiofauna de la cuenca del golfo de Paria comparte casi todas las especies con la cuenca del Orinoco. Por otro lado, la presencia de al menos cuatro especies endémicas parece indicar que la cuenca del golfo de Paria representa un área biogeográfica particular y con una historia evolutiva propia. Se discuten estos aspectos y el papel del delta del río Orinoco en la dispersión de las especies.
Keywords:
Ictiofauna, Biodiversidad, Biogeografía vicariante, Cuenca del golfo de Paria, Cuenca del Orinoco (es)
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How to Cite
Lasso, C. A., Provenzano, F., & Lasso-Alcalá, O. M. (2010). Ictiofauna dulceacuícola y estuarina de la cuenca del golfo de Paria, Venezuela: composición y relaciones biogeográficas con la cuenca del Orinoco. Biota Colombiana, 11(1 y 2). Retrieved from https://revistas.humboldt.org.co/index.php/biota/article/view/232
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