assemblage

https://doi.org/10.1351/goldbook.14450
Set of coexisting populations defined by phylogeny, location, or life style. Assemblages are intermediate between populations and communities.
Note: An operational definition is "species located in the same place at the same time".
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 841 [Terms] [Paper]