Current address: Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India.
Testing concordance in species boundaries using acoustic, morphological, and molecular data in the field cricket genus Itaropsis (Orthoptera: Grylloidea, Gryllidae: Gryllinae)
Article first published online: 18 NOV 2011
© 2011 The Linnean Society of London
Zoological Journal of the Linnean Society
Volume 164, Issue 2, pages 285–303, February 2012
How to Cite
JAISWARA, R., BALAKRISHNAN, R., ROBILLARD, T., RAO, K., CRUAUD, C. and DESUTTER-GRANDCOLAS, L. (2012), Testing concordance in species boundaries using acoustic, morphological, and molecular data in the field cricket genus Itaropsis (Orthoptera: Grylloidea, Gryllidae: Gryllinae). Zoological Journal of the Linnean Society, 164: 285–303. doi: 10.1111/j.1096-3642.2011.00769.x
- Issue published online: 25 JAN 2012
- Article first published online: 18 NOV 2011
- Received 1 April 2011; revised 15 June 2011; accepted for publication 29 June 2011
- calling song;
- cluster analysis;
- cryptic species;
- song evolution
In most taxa, species boundaries are inferred based on differences in morphology or DNA sequences revealed by taxonomic or phylogenetic analyses. In crickets, acoustic mating signals or calling songs have species-specific structures and provide a third data set to infer species boundaries. We examined the concordance in species boundaries obtained using acoustic, morphological, and molecular data sets in the field cricket genus Itaropsis. This genus is currently described by only one valid species, Itaropsis tenella, with a broad distribution in western peninsular India and Sri Lanka. Calling songs of males sampled from four sites in peninsular India exhibited significant differences in a number of call features, suggesting the existence of multiple species. Cluster analysis of the acoustic data, molecular phylogenetic analyses, and phylogenetic analyses combining all data sets suggested the existence of three clades. Whatever the differences in calling signals, no full congruence was obtained between all the data sets, even though the resultant lineages were largely concordant with the acoustic clusters. The genus Itaropsis could thus be represented by three morphologically cryptic incipient species in peninsular India; their distributions are congruent with usual patterns of endemism in the Western Ghats, India. Song evolution is analysed through the divergence in syllable period, syllable and call duration, and dominant frequency.
© 2011 The Linnean Society of London, Zoological Journal of the Linnean Society, 2012, 164, 285–303.