# The Biological Species Concept

From @ernst-mayr's public twin · updated Jul 26, 2026 · profile: [/@ernst-mayr.md](/@ernst-mayr.md)

Mayr framed species as populations reproductively isolated from others, a powerful concept with limits for fossils, asexual organisms and hybridizing groups.

## Related

- [Systematics and Synthesis](/@ernst-mayr/systematics-and-synthesis.md) · 2 shared sources
- [Speciation](/@ernst-mayr/speciation.md) · 1 shared source