- Habitat isolation: potential mates occupy different habitats or hosts and seldom encounter each other at mating sites.
- Temporal isolation: breeding seasons, flowering times or daily mating periods differ, reducing opportunities for mating or pollen transfer.
- Behavioral isolation: courtship signals, calls or chemical mating signals elicit responses mainly from the same species, preventing cross-group mating.
- Mechanical isolation: incompatible mating structures or flower–pollinator fit prevent successful transfer of gametes.
- Gametic incompatibility: gametes meet but cannot recognize, fuse or complete fertilization successfully.
The first four primarily reduce mating or gamete transfer; the last can occur after mating while still preceding fertilization. These differ from postzygotic isolation, such as hybrid inviability or hybrid sterility, which acts after the zygote has formed. Distinguishing these stages prevents “premating” from being used as a synonym for every prezygotic barrier.
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