Search

The Multiple Use Reserve of Valle Fertil (San Juan province, Argentina) is a protected area with particular climatic features that includes a large segment of xeric environments. It harbors numerous endemic and protected species. Despite the conspicuous presence of a cacti and succulent community in the area, a formal survey of species richness had been lacking. Moreover, as this region has been declared at risk of degradation due to soil erosion driven by high deforestation rates the importance of carrying out biodiversity surveys with interest on conservation raises. During the last decade, and product of several field trips to the Reserve, seven genera of Cactaceae were observed. Thus, we present the first formal list of cacti and succulent species in the Multiple Use Reserve of Valle Fertil gathering relevant information for scientific and conservational purposes.

En los ríos sudamericanos, Eichhornia crassipes y otras plantas flotantes se entrelazan y forman balsas flotantes conocidas comúnmente como “camalotales” especialmente abundantes durante los períodos de inundación. Durante las inundaciones, grandes superficies de estas balsas flotantes son derivadas por los ríos de la Cuenca del Plata. En el Río de la Plata numerosos trabajos sugieren que muchas especies de animales y plantas de latitudes subtropicales colonizan el área a través de estasgrandes balsas. Estos episodios son muy importantes desde el punto de vista económico debido a que causan varios problemas de navegación yotras actividades. Por otro lado, para la biodiversidad tiene beneficios evidentes, y muchos autores consideran este proceso vital para los humedales y bosques del Río de la Plata. Sin embargo, hay escaso conocimiento sobre la composición de las especies de plantas de los camalotales. Con el fin de crear una lista exhaustiva de su flora, visitamos la costa del Río de la Plata durante una llegada masiva. Treinta y dos especies de plantas seregistraron en tres complejos diferentes: camalotalessensu stricto, pajonales flotantes (canutillares) y embalsados. Frente a este inesperado hecho, enfatizamos la necesidad de incluir este fenómeno en los planes regionales de conservación de la biodiversidad., In South American rivers, Eichhornia crassipes and other floating plants intertwine and form floating rafts commonly known as “camalotales” which are especially abundant during flooding periods. During extraordinary floods, hectares of floating mats are drifted by the Plata Basin Rivers. In the Río de la Plata several reports suggest that many animal and plant species from subtropical latitudes colonizes the area through these large rafts. These episodes are very important from the economic point of view because they cause several troubles to navigation and other activities. On the other hand, benefits to biodiversity are conspicuous, and many authors consider this process vital to the Río de la Plata wetlands and forests. However, there is scarce knowledge about Eichhornia rafts plant species composition. With the aim of creating an exhaustive list of the flora of the Eichhornia rafts, we visited the Río de la Plata coast during a massive Eichhornia rafts arrival. Thirty-two plant species were recorded in three different plant assemblages: Eichhornia rafts sensu stricto, floating reeds (canutillares) and embalsados. In front of this unexpected we emphasize the need to include this phenomenon in regional biodiversity conservation plans., Facultad de Ciencias Naturales y Museo