The study of species diversity and the role of interactions among species in influencing diversity is known as ___.

Community ecology

Explanation:

A community is a collection of species that live together in a particular geographical area and time.

The study of how the different species interact and influence each other is known as community ecology. Specifically the influence one organism has on others' genetic makeup and physical characteristics. It is also called synecology.

Organisms can be studied better if the factors which affect the other species is known.