Allochronic isolation and incipient hybrid speciation in tiger swallowtail butterflies Ording, Gabriel James ; Mercader, Rodrigo J. ; Aardema, Matthew L. ; Scriber, J. M. Abstract Publication: Oecologia Pub Date: February 2010 DOI: 10.1007/s00442-009-1493-8 Bibcode: 2010Oecol.162..523O