If two populations are reproductively isolated from one another (like certain populations of Russian warblers), they must be genetically isolated from each other and therefore cannot belong to the same species.

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Reproductive isolation is a key mechanism in the process of speciation, but it does not immediately imply that two populations are genetically isolated to the extent that they cannot belong to the same species. Populations can experience periods of reproductive isolation and still interbreed under certain conditions or through mechanisms like hybridization, maintaining genetic flow between them. The concept of a species is complex and can encompass populations that are currently reproductively isolated but still share enough genetic similarity to be considered the same species.

If Two Populations Are Reproductively Isolated from One Another (Like