TY - JOUR T1 - Rapid divergence of courtship song in the face of neutral genetic homogeneity in the cactophilic fly Drosophila buzzatii JF - Biological Journal of the Linnean Society Y1 - 2018 A1 - Iglesias, Patricia P A1 - Soto, Ignacio M A1 - Soto, Eduardo M A1 - Calderón, Luciano A1 - Hurtado, Juan A1 - Hasson, Esteban KW - common-garden KW - divergent selection KW - microsatellites KW - mtDNA KW - QST–FST AB -

A wide spectrum of song complexity has been documented in a broad range of animal taxa. However, the underlying processes shaping acoustic differences are still poorly understood. Empirical and theoretical studies suggest that different song parameters may be subject to different tempos and modes of evolution, resulting in a complex combination of stabilizing and directional selection that change among populations and through time. Nonetheless, the contribution of genetic drift to acoustic divergence is largely unexplored. In this study, we used the QST–FST approach to investigate the relative role of selective and neutral processes in the evolution of courtship song in the cactophilic fly Drosophila buzzatii. We quantified variation in courtship song among 12 populations using flies reared under common-garden conditions. We found among-population divergence in courtship song parameters, but genetic homogeneity and no population structure. Using both mitochondrial DNA and microsatellite markers, we found evidence consistent with a role for directional selection causing song divergence. We discuss the statistical difficulties of detecting stabilizing selection as opposed to directional selection in our data. The role of song parameters in mate recognition and mate choice, and the role of sexual selection in song elaboration are also discussed.

UR - https://academic.oup.com/biolinnean/advance-article/doi/10.1093/biolinnean/bly108/5073117 ER - TY - JOUR T1 - Evolution and systematics of Green Bush-crickets (Orthoptera: Tettigoniidae: Tettigonia) in the Western Palaearctic: testing concordance between molecular, acoustic, and morphological data JF - Organisms Diversity & Evolution Y1 - 2017 A1 - Grzywacz, Beata A1 - Klaus-Gerhard Heller A1 - Warchałowska-Śliwa, Elżbieta A1 - Karamysheva, Tatyana V. A1 - Dragan Petrov Chobanov KW - bioacoustics KW - mtDNA KW - phylogeny KW - rDNA KW - Tettigonia AB -

The genus Tettigonia includes 26 species distributed in the Palaearctic region. Though the Green Bush-crickets are widespread in Europe and common in a variety of habitats throughout the Palaearctic ecozone, the genus is still in need of scientific attention due to the presence of a multitude of poorly explored taxa. In the present study, we sought to clarify the evolutionary relationships of Green Bush-crickets and the composition of taxa occurring in the Western Palaearctic. Based on populations from 24 disjunct localities, the phylogeny of the group was estimated using sequences of the cytochrome oxidase subunit I (COI) and the internal transcribed spacers 1 and 2 (ITS1 and ITS2). Morphological and acoustic variation documented for the examined populations and taxa was interpreted in the context of phylogenetic relationships inferred from our genetic analyses. The trees generated in the present study supported the existence of three main lineages: “A”—composed of all sampled populations of Tettigonia viridissima and the Tettigonia vaucheriana complex, “B”—comprising Tettigonia caudata, Tettigonia uvarovi, and the Tettigonia armeniaca complex, and “C”—consisting of Tettigonia cantans. The present study provides the first phylogenetic foundation for reviewing the systematics of Tettigonia (currently classified mostly according to morphological characteristics), proposing seven new synonymies.

VL - 17 UR - http://link.springer.com/10.1007/s13127-016-0313-3 IS - 1 JO - Org Divers Evol ER -