Answer:
Ecological species concept
Step-by-step explanation:
A species is a group of living organism consisting of individuals that can interbreed.
There are different types of species concepts. For instance, Ecological species concept defines species are a group of individuals that share the same ecological niche.
Therefore, when the biologist did not consider the physical similarities of the wolf spiders rather their ecological niche to group them.
I shows he utilized the ecological species concept.