A group of individuals of a particular species living in a defined area is a what?

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A population is a group of individuals of the same species living in a defined area. This term specifically refers to how many members of that species occupy and interact within that space, which lets ecologists study things like population size, density, and distribution.

Biodiversity refers to the variety of life in an area, including many species and genetic diversity, not just how many of one species are present. A species is the basic biological category for organisms that can interbreed, but that doesn’t describe how many of them live together in a place. Nitrification is a process in the nitrogen cycle carried out by microbes, unrelated to grouping of individuals by location or species.

So the best fit for a group of individuals of a particular species living in a defined area is a population. For example, a population of deer in a forest patch.