The Delta del Paraná Biosphere Reserve is a coastal freshwater delta of the Paraná River located just north of Buenos Aires. The Predelta National Park is located in the Argentine Mesopotamia, at the beginning of the Paraná River Delta.
The Predelta National Park is a national park of Argentina, located in the southwest of Entre Ríos Province, in the Argentine Mesopotamia, at the beginning of the Paraná River Delta. The park was created to protect a sample of the Upper Delta of the Paraná, which belongs to the Paraná Delta and Islands Ecoregion.
The Predelta is the area where the sediments of the Paraná River start forming islands, while the river itself splits into several major arms and many smaller watercourses. It encompasses an area of 24.58 sq km or just over 94 sq mi.
The original ecosystem, especially in the Lower Delta, has been heavily modified by deforestation, hunting, fishing and the introduction of foreign species of flora, as well as damaged by domestic and industrial pollution. It hosts species such as the marsh deer, the capybara, the neotropical river otter, the Pampas cat, the jaguar, the coypu and the red-faced guan, some of them endangered.
The Paraná Delta Biosphere Reserve is composed of the second and third sections of the Islands of the San Fernando Delta, located just north of Buenos Aires. It is an area rich in biodiversity including species that find their southernmost limit of distribution, which makes the area interesting for the conservation of genetic diversity.
The flooded river beds are dominated by Totora (Schoenoplectus californicus) and in certain young islands, 'pajonal' (Scirpus giganteus), 'margaritón de bañado' (Senecio bonariensis), 'espadaña' (Zizaniopsis bonariensis) and 'saeta' (Sagitaria montevidensis) are found.
The Biosphere Reserve also contains low forests, forest ecosystems and secondary forests with Black Cottonwood (Populus spp.) and Willow Salix spp. and relict Monte Blanco forest with 'Canelón' (Rapanea spp), 'Arrayan' (Blepharocalyx tweediei).
The main human activity in the delta is the exploitation of the willow forest for commercial purposes. Some areas are however difficult to access and human impact is low. The region has suffered from a loss of human population and today there are only 3,600 inhabitants living there (2001).
The establishment of the Biosphere Reserve aims at revitalizing the economy of the region at the same time as conserving the natural and cultural values of the area.