In a new paper in Trends in Ecology and Evolution, Dr Gabriel Jamie and Dr Joana Meier explore the phenomenon that the same polymorphisms often recur in many members of a species radiation (e.g. colour/pattern morphs, heterostyly, mating types, shell chirality). This phenomenon is puzzling because speciation often represents a barrier to the inheritance of the ancestral genetic variation underpinning polymorphisms. Generally, only a subset of the ancestral population go on to become founders of the new species. They outline the characteristics of polymorphisms that help their underlying genetic variation get inherited from ancestral standing variation, re-introduced through introgression or re-invented through mutation and also explore the factors influencing whether the requisite balancing selection operates widely across daughter species so that polymorphisms are maintained in many members of the radiation.
Dr Gabriel Jamie gave a talk on mimicry in the parasitic finches of Africa at Birdlife South Africa’s Virtual African Birdfair. Please also see Dr Jessica van der Wal’s talk on our sister research project on honeyguide-human mutualism (more information at www.AfricanHoneyguides.com) and many other great research talks by our colleagues at the FitzPatrick Institute of African Ornithology. Also visit the amazing line-up of other talks at the Virtual African BirdFair, including a talk on bird art by the brilliant Faansie Peacock who has generously allowed us to use his illustrations in several of our scientific publications. Thank you BirdLife South Africa!