Savannas

Definition

Savannas are grassland ecosystems characterized by the presence of scattered trees and a continuous layer of grasses. They are typically found in regions with seasonal rainfall, alternating between wet and dry periods.

5 Must Know Facts For Your Next Test

1. Savannas cover approximately 20% of Earth's land area, predominantly in Africa, South America, India, and Australia.
2. The climate in savannas is marked by distinct wet and dry seasons, with most precipitation occurring during the wet season.
3. Fire plays a crucial role in maintaining savanna ecosystems by preventing tree overgrowth and promoting grassland health.
4. Savannas support diverse wildlife, including large herbivores like elephants and zebras, as well as predators like lions and cheetahs.
5. Human activities such as agriculture and urbanization pose significant threats to savanna ecosystems through habitat destruction and fragmentation.

Review Questions

• What climatic conditions are characteristic of savannas?
• How does fire contribute to the maintenance of savanna ecosystems?
• Name three types of wildlife commonly found in savanna biomes.

Related terms

Grasslands: Ecosystems dominated by grasses with few trees or shrubs.

Deserts: Arid regions with very low precipitation, sparse vegetation, and extreme temperature variations.

Tropical Rainforests: Dense forests located near the equator with high biodiversity and consistent year-round rainfall.