Abstract
The first list of fish species from the Río Pilcomayo National Park and Ramsar Site (RPNP), located in the Wet Chaco plains of northern Argentina is presented here. Samplings were carried out bimonthly from December 2006 to January 2008 in sites representative of the different landscapes, in both dry and wet seasons. A total of 77 species were collected, belonging to 23 families and eight orders and covering 54% of the province ichthyofauna. New records to the Province of Formosa are Brachyhypopomus gauderio Giora & Malabarba, 2009; Cyanocharax sp. and Hypophthalmus edentatus Spix & Agassiz, 1829.
Highlights
The northeastern corner of Formosa province belongs to the wet plains of the Great Chaco region, whose fish fauna is well known for their particular adaptations to seasonal environments (Carter and Beadle 1931)
Menni (2004) mentioned the presence of 143 fish species in the Formosa Province, based on point records mostly from large rivers and related wetlands while Canón Verón (2008) reported 89 species just for the eastern portion of the province. Considering these references together, the RPNP area covered 54% of the ichthyofauna known from this province
Our study provided new records for the RPNP area
Summary
The northeastern corner of Formosa province belongs to the wet plains of the Great Chaco region, whose fish fauna is well known for their particular adaptations to seasonal environments (Carter and Beadle 1931). Its ichthyological composition was summarized by Menni (2004), but none of the previous studies has taken into account differences in landscape structure and seasonality. The main objective of this paper is to document the fish fauna of the Río Pilcomayo National Park and Ramsar Site, based on year round inventories which involved different landscape patterns and hydrological conditions
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