RT Journal Article
SR Electronic
T1 Rana pipiens Complex: Mating Call Structure and Taxonomy
JF Science
JO Science
FD American Association for the Advancement of Science
SP 1003
OP 1005
DO 10.1126/science.162.3857.1003
VO 162
IS 3857
A1 Littlejohn, M. J.
A1 Oldham, R. S.
YR 1968
UL http://science.sciencemag.org/content/162/3857/1003.abstract
AB Geographic variability in call structure indicates that four largely allopatric populations of leopard frogs are present in the central United States. These forms appear to maintain their distinctness in narrow zones of sympatry, and most adult males can be separated morphologically. It is suggested that the four forms represent distinct species and that the idea of gradual clinal variability in one wide-ranging species is wrong.