Gymnocharacinus bergii: Naked Characin

Abstract

Justification:The Naked Characin is assessed as Critically Endangered because its extent of occurrence (EOO) isestimated to be less than 40 km², its area of occupancy (AOO) is less than 10 km²; it is known from onethreat-defined location and its population is considered to be severely fragmented; there is continuingdecline in its EOO and AOO, in the extent and quality of its aquatic habitat in the headwaters of theValcheta Stream, Argentina, and there is also a decline in the number of subpopulations.Previously Published Red List Assessments1996 ? Endangered (EN)http://dx.doi.org/10.2305/IUCN.UK.1996.RLTS.T40695A10337994.en1996 ? Endangered (EN)1994 ? Vulnerable (V)1990 ? Vulnerable (V)1988 ? Vulnerable (V)1986 ? Vulnerable (V)Geographic RangeRange Description:This species is known only from the headwaters of Arroyo Valcheta in the Somuncurá Plateau, anisolated basaltic plateau in the Río Negro Province, Argentinean Patagonia.