Key Concepts

CONCEPT 19.1 Species diversity differs among communities as a consequence of regional species pools, abiotic conditions, and species interactions.

CONCEPT 19.2 Resource partitioning is theorized to reduce competition and increase species diversity.

CONCEPT 19.3 Processes such as disturbance, stress, predation, and positive interactions can mediate resource availability, thus promoting species diversity.

CONCEPT 19.4 Many experiments show that species diversity affects community function.