Evolutionary BiologyJournal of Evolutionary BiologyPeer-reviewed
Times birds need to evolve mating cues under allopatry and parapatry
Richard M. Sibly, R. N. Curnow
The paper compares speciation times for mating cues under allopatry and parapatry, finding that parapatric speciation can explain the rapid evolution of species-specific traits like songs or plumage coloration.