Male secondary sexual characteristics sexual sele

Authors: EMERSON SHARON B WARD RYK

Publish Date: 1998/04/01

Volume: 122, Issue: 4, Pages: 537-553

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Abstract

SHARON B EMERSON RYK WARD Male secondary sexual characteristics sexual selection and molecular divergence in fanged ranid frogs of Southeast Asia Zoological Journal of the Linnean Society Volume 122 Issue 4 April 1998 Pages 537–553 https//doiorg/101111/j109636421998tb02162xA group of Southeast Asian frogs of the family Ranidae are characterized by a suite of unusual secondary sexual characteristics Males are larger than females possess bony odontoid processes fangs and have enlarged heads While all members of this clade are sexually dimorphic in this suite of characters the degree of development of the secondary sexual characteristics in males varies widely across species One of the most common species Rana blythii Boulenger has an extremely broad geographical range This frog lacks an advertisement call in Borneo but calling has been reported in populations from peninsular Malaysia and Vietnam This study examines the relationship between the expression of male secondary sexual characteristics molecular divergence and number of speciation events in widely separated populations of R blythii and between R blythii and other species of closely related fanged frogs belonging to the grunniens species group Results from morphometric and sequence data indicate that 1 there is no correlation between morphological and molecular distance in these frogs and 2 there is no correlation between morphological distance and the number of speciation events separating taxa Systematic analysis demonstrates that R blythii as currently recognized is not a single species nor is it monophyletic

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