Question

what is community variation
​

Answer 1

A community changes when its constituent species change and/or when the frequency of species changes over time. ... It represents the change in the total or average phenotype of the ecosystem that can be explained by variation in fitness within species.

Answer 2

$\large\underline{ \underline{ \sf \maltese\:{Community ~ variation:-}}}$

A community changes when its constituent species change and/or when the frequency of species changes over time. ... It represents the change in the total or average phenotype of the ecosystem that can be explained by variation in fitness within species.