Seeing as this thread seems to be attracting lots of African Cichlid people - I thought you might want to see this, its a case study we looked at in Genetics recently when were we talking about diversity reduction in founding populations - the moral of the story is that Tanganyikan's are more diverse, genetically, than Malawi's and Victorian's as the Tang's are the ones that founded those populations... quite interesting!!
Anyway - take a look!!: