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The rates of evolution of songs and speciation in grasshoppers from subfamily Gomphocerinae (Orthoptera, Acrididae, Gomphocerinae)

© 2020 N. S. Sevastianov

Institute for Information Transmission Problems, Russian Academy of Sciences 127051 Moscow, Bolshoy Karetny per. 19, Russia

Received 12 Sep 2019

In grasshoppers of subfamiliy Gomphocerinae, song is the main component of reproductive isolation. Among singing Orthoptera, acoustic communication in Gomphocerinae is most developed in terms of complexity of stridulatory leg movements, the number of sound elements and mating strategies. The aim of work was to evaluate the evolutionary rates of two types of songs by comparing phylogenetic reconstructions and acoustic data. We analyzed calling and courtship songs from 120 pairs of closely related grasshopper species which were selected from molecular phylogenetic trees. 31 characters and 60 characters that included both sound and stridulatory leg movement parameters were chosen for the calling song analyses and the courtship song analyses, respectively. The song complexity was calculated based on an assessment of the effect on the complexity of each attribute value. Three markers (COI, ITS1 and ITS2) and the MCMC and ML methods were used to reconstruct the phylogenetic relationships within Gomphocerinae. Data was divided into subsets based on allopatry / sympatry of sister species. A correlation analysis was conducted between song parameters and genetic distance. The results suggest that the high degree of courtship song complexity in young species in the case of both sympatric and allopathic speciation could be a sign of the major role of sexual selection in the evolution of isolation barriers in Gomphocerinae, and, as a consequence, in the process of speciation.

Key words: Gomphocerinae, acoustic communication, phylogeny, sexual selection, speciation

DOI: 10.31857/S0235009220010096

Cite: Sevastianov N. S. Tempy evolyutsii akusticheskikh signalov i vidoobrazovaniya u saranchovykh podsemeistva gomphocerinae (insecta, orthoptera, acrididae) [The rates of evolution of songs and speciation in grasshoppers from subfamily gomphocerinae (orthoptera, acrididae, gomphocerinae)]. Sensornye sistemy [Sensory systems]. 2020. V. 34(1). P. 3-11 (in Russian). doi: 10.31857/S0235009220010096


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