How do biomes differ from ecosystems and biological communities?

To understand the hierarchy of life on Earth, it is helpful to distinguish between biological communities, ecosystems, and biomes. These terms represent different levels of ecological organization, ranging from specific groups of organisms to global patterns of life.

Biological Communities

A biological community consists exclusively of the living components of an area—an interacting group of various species in a common location. It focuses solely on the organisms, such as the plants, animals, bacteria, and fungi found in a specific habitat, excluding all nonliving (abiotic) factors.12

Ecosystems

An ecosystem is a more comprehensive unit that includes the biological community of an area together with its physical, nonliving environment. This includes interactions between the biota and factors such as climate, soil, water, and nutrients. While a community is just the "who" of a location, an ecosystem encompasses both the "who" and the "where," including the flow of energy and the cycling of matter.132

Biomes

A biome is a major ecological community type defined by similar climatic conditions and geologic features. Biomes are the fundamental units that make up larger biogeographic regions. Unlike a specific local ecosystem, a biome represents a global pattern; for example, the tropical forest biome occurs in various parts of the world where similar environments exist. While the specific species may differ between two locations within the same biome, they often support organisms that are ecologically equivalent, having adapted analogously to similar environmental pressures.45