Animal sampling was authorized by the Instituto Chico Mendes de Conservação da Biodiversidade(ICMBio licences#19629 and#33735);approved by the Committee of Ethics for the Use of Animals(CEUA)at Universidade Estadual Paulista,Jaboticabal,Brazil(protocol#016549/09);RCN received grant#2012/06228-0,grant#2013/04023-5 and grant#2014/04394-6;CPAP received grant#2009/12013-4,all from the São Paulo Research Foundation(FAPESP);CPAP and KRZ thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico(CNPq)and NSF for research fellowships.
The mechanisms of hybridization can be elucidated by analyzing genotypes as well as phenotypes that could act as premating barriers,as the reproductive interactions among heterospecifics can alter the evolutionary hist...