title: Immunological resolution of a diploid-tetraploid species complex of tree frogs.
abstract: Micro-complement fixation studies of eastern and western populations of the North American tree frog Hyla chrysoscelis reveal they have been genetically isolated for about 4 million years. Immunological comparisons of populations of the cryptic tetraploid Hyla versicolor indicate a recent origin, from hybridization between eastern and western H. chrysoscelis.
authors.forename: L
authors.initials: L
authors.lastname: Maxson
authors.forename: E
authors.initials: E
authors.lastname: Pepper
authors.forename: R D
authors.initials: RD
authors.lastname: Maxson