Presentation on theme: "Tropical Savannas and Woodlands. Tropical savannas are grasslands with a scattering of shrubs or trees. Tropical woodlands have a higher density of trees,"— Presentation transcript:
The Serengeti illustrates many of the relationships that are important in ecosystems.
More than 3 million ungulates of 28 species inhabit the region.
These herbivores consume about 66% of the aboveground net primary production. Probably the largest fraction of any ecosystem. Areas subjected to grazing show primary production about twice that of protected areas. Grazing lawns.
Migrations follow a gradient of forage abundance and nutritional quality. Wildebeest, plains zebras, and Thomson’s gazelles spend the wet part of the year on the southern plains. As forage begins to dry and disappear, they move northwest, then gradually concentrate in the northern area near the Kenyan border. When rains resume, they return south to the plains.