Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Biomes are large-scale ecological communities characterized by distinct climate conditions, vegetation types, and animal species. They represent different regions across the globe with similar environmental characteristics.
Biodiversity refers to the variety of living organisms within an ecosystem or biome. It includes genetic diversity, species diversity, and ecosystem diversity.
Ecotone: An ecotone is a transitional area where two different ecosystems or biomes meet. It often exhibits a mix of characteristics from both adjacent ecosystems and supports unique species adapted to the conditions found there.
Keystone Species: A keystone species is a plant or animal that plays a crucial role in maintaining the structure and function of an ecosystem. Their presence has a disproportionate effect on the overall biodiversity and stability of their habitat.