Does bill size polymorphism affect courtship song characteristics in the African finch Pyrenestes ostrinus?
Refugial isolation versus ecological gradients: testing alternative mechanisms of evolutionary divergence in four rainforest vertebrates
Evaluating the Diveregence-with-Gene-Flow Model in Natural Populations: The importance of Ecotones in Rainforest Speciation
Testing alternative hypothereses for evolutionary diversification in an african songbird: rainforest refugis versus ecological gradients
Patterns of morphological and geographic variation in trophic bill morphs of the African finch Pyrenestes
Patterns of divergence in the olive sunbird Cyanomitra olivacea (Aves: Nectariniidae) across the African rainforest–savanna ecotone