Abstract
An annotated list of the freshwater fishes of the Río Alvarado drainage, Upper Río Magdalena Basin is presented. Fishes were captured from nine localities, quarterly sampled between September 2012 and July 2013. A total of 36 species belonging to 14 families, distributed in five orders were collected. The most abundant species was Trichomycterus banneaui (Eigenmann, 1912) (19.4%), followed by Creagrutus affinis Steindachner, 1880 (13%), Chaetostoma thomsoni Regan, 1904 (9.1%), Trichomycterus mogotensis Ardila-Rodríguez, 2017 (7.7%), Astroblepus homodon (Regan, 1904) (6.6%), Creagrutus dulima Albornoz-Garzón, Conde-Saldaña, García-Melo, Taphorn & Villa-Navarro, 2018 (5.9%), Poecilia sphenops Valenciennes, 1846 (5.7%) and Argopleura magdalenensis (Eigenmann, 1913) (5.6%). An identification key and a complete photographic catalog of all fish species recorded in the drainage are presented.
Highlights
The Magdalena-Cauca system harbors 217 valid species (DoNascimiento et al 2019), many of which are endemic or are important for fisheries (Galvis and Mojica 2007; Anderson and Maldonado-Ocampo 2011)
Characidium phoxocephalum Eigenmann is categorized as Vulnerable, and Kronoheros umbrifer Meek & Hildebrand, Hypostomus (Cochliodon) hondae Regan, and Microgenys minuta Eigenmann as Near Threatened
We recorded 36 species in the Río Alvarado drainage, which represents about 16.6% of the total species of the Magdalena-Cauca system (DoNascimiento et al 2019) and 29.6% of the Upper Río Magdalena (Villa-Navarro et al 2006)
Summary
The Magdalena-Cauca system harbors 217 valid species (DoNascimiento et al 2019), many of which are endemic or are important for fisheries (Galvis and Mojica 2007; Anderson and Maldonado-Ocampo 2011). This basin has been subdivided in three stretches: Upper, Middle and Lower Magdalena Basin (Eigenmann 1920; Mojica and Franco 1990). Each region has its own hidromorphological and biological conditions (Mojica and Franco 1990; Forero-Medina and Joppa 2010). Mojica 2007; Forero-Medina and Joppa 2010; RomeroDuque et al 2019). Likewise, this is a region with a high anthropogenic pressure due to landscape transformation, mainly cattle and agriculture activities (Forero-Medina and Joppa 2010)
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