SciELO - Scientific Electronic Library Online

vol.41 issue1A comparison of species distribution models to predict wildlife's potential distribution in Bolivia author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Ecología en Bolivia

Print version ISSN 1605-2528On-line version ISSN 2075-5023


MIRANDA CHUMACERO, Guido. Altitudinal distribution, relative abundance and density of fishes in Rio Huarinilla system (Cotapata, Bolivia). Ecología en Bolivia [online]. 2006, vol.41, n.1, pp.79-93. ISSN 1605-2528.

Altitudinal ranges, density, abundance, and biology of most fishes of Andean rivers are little known. For this reason, between June and August 2003, using an electrofishing gear, I sampled the fish fauna in the lower basin (1.040-1.700 m elevation) of the Rio Huaranilla and its tributaries, located in the Cotapata National Park, Bolivia. I recorded eight species belonging to seven genera and six families. On average, Hemibrycon beni was the most abundant of the species (relative abundance 61.9%), even though I did not record it at elevations above 1.360 m. The genus Astroblepus (made up of two sibling species, possibly more) made up 31.4% of the individuals captured and reached up to 1.560 m in elevation. Trichomycterus sp.1 contributed many fewer individuals (3.4% of the total) and was found from the lowest to the highest sampled points. Other species found (Knodus cf. heteresthes, Ancistrus sp., Parodon nasus, Tetragonopterinae sp. 1 y Rhamdia quelen) did not extend above 1.300 m in elevation and represented less than 2% of the relative abundance. Ephemeroptera and Diptera were the most abundant items in stomachs observations in most species. Possibly, spawning occurs before the rain season (July to November). Additionally, I estimated density and distribution in the basin of each species.

Keywords : Mountain fishes; Yungas; rain forest rivers; streams; electrofishing.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License