Guianan Savanna Ecoregion (South America)

Guianan Savanna Ecoregion (South America)

Tue, 12/11/2018 - 16:57

The Guianan savanna is an ecoregion in the south of Venezuela, Guyana and Suriname and the north of Brazil. The savanna covers an area of rolling upland plains on the Guiana Shield between the Amazon and Orinoco basins.

The Guianan savanna is an ecoregion in the south of Venezuela, Guyana and Suriname and the north of Brazil. The savanna covers an area of rolling upland plains on the Guiana Shield between the Amazon and Orinoco basins. It includes forested areas, but these are shrinking steadily due to the effect of frequent fires, either accidental or deliberate. The ecoregion includes the Gran Sabana region of Venezuela.

The large, relatively intact grasslands of the Guianan Savanna ecoregion is embedded in a landscape of tropical rain forest and tepui sandstone peaks. These grasslands occur in three distinct patches, becoming increasingly smaller as they move south from the Guyana Shield to the mouth of the Amazon River.

All three sections adjoin the Uatuma-Trombetas moist forests ecoregion to the south. The most eastern section adjoins the Marajó várzea to the east, at the mouth of the Amazon River. The Guianan moist forest ecoregion lies to the east of the main section and to the north of the other two sections. The main section adjoins the Guianan piedmont and lowland moist forests ecoregion to the west. The northern part of the main section adjoins areas of the Guianan Highlands moist forest and Pantepuis ecoregions.

The savanna encompasses the treeless and tree patch mosaic of the Gran Sabana, and occurs as three distinct outliers: the largest spanning northern Brazil, southeastern Venezuela, and southeastern Guyana (also several small patches extending north along the Pakarima footfills); a smaller patch bordering northern Brazil and extending into southern Suriname, and the smallest and most elongate outlier, that occurs in eastern Brazil north of the Amazon extending from near Macapa to near Calcoene.

The Guianan savanna ecoregion is in the neotropic ecozone and the tropical and subtropical grasslands, savannas, and shrublands biome.