I have seen a hybrid swarm (green x central longear) and presently have about 25 green x pumpkinseed. Male F1 hybrids of both are sterile and the female F1 hybrid green x pumpkinseed is fertile. Hybrids of both are clearly intermediate.
The hybrid (green x central) swarm was in the Hogthief Creek drainage of southern Illinois. Several males had nest within a colony of pure central longear with the hybrids holding the premium sites. Despite the hybrids being clearly larger with the best sites they could not attract females of any type. Ripe green females avoided the colony and the central longear females enetered nest of only the central longears despite the hybrids willingness to intrude (likely trying to cuckhold). One female hybrid of same was in same pool and associated mostly with central longears but did not appear to be part of reproductive effort (not thin or fat).
Edited by centrarchid, 25 March 2008 - 09:57 PM.