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Revista mexicana de biodiversidad

On-line version ISSN 2007-8706Print version ISSN 1870-3453

Abstract

GUERRERO, Elián Leandro; APODACA, María José; DOSIL-HIRIART, Florencia Débora  and  CABANILLAS, Pablo Alejandro. Biogeographical analysis of the Río de la Plata fluvial system wetlands based on climbing and epiphyte plants. Rev. Mex. Biodiv. [online]. 2018, vol.89, n.4, pp.1190-1200. ISSN 2007-8706.  https://doi.org/10.22201/ib.20078706e.2018.4.2519.

Ecological regionalization schemes emphasize the coastal wetlands of the Plata basin as an independent unit, because their characteristics contrast with the areas they cross. In the historical regionalization schemes, based on areas of endemism, there is no consensus to whether the riverine environments are a biogeographic unit, and in the case that they are, to which biogeographic province they belong. The positions about this topic can be summarized as: a) the wetland and forests system belongs to a district within the Paraná province; b) belongs to the Pampean province, and c) it is not possible to locate them in terrestrial regionalizations. In order to verify which of the hypotheses is better supported, an exploration for common distribution patterns was made, based on the concept that nestednes of areas of endemism is the essential tool for a regionalization. The geographic distribution of the climbing plants and epiphytes species that reach the Argentine coast of the Río de la Plata by the fluvial route was studied. Recurrent patterns of geographic distribution of river species were achieved and the location of the system in the biogeographic units recognized in the historical regionalizations was specified. The large number of species restricted to this area allows us to recognize it as an area of endemism nested within the Paraná province. This supports the hypothesis that gallery forests can be considered an extension of the Mixed Forests district of the Paraná province.

Keywords : Areas of endemism; Paraná; Vascular plants; Río de la Plata fluvial system.

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