Asymmetric mate choice, hybridization, and hybrid fitness in two sympatric grasshopper species

Hochkirch, Axel; Lemke, Isgard

doi:10.1007/s00265-011-1174-6

Cited by 31 publications

(37 citation statements)

References 55 publications

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“…As acoustic signals are important for intraspecific and sex recognition as well as for interspecific isolation (Paterson 1985;Hochkirch and Lemke 2011), they are of great significance for studying the processes underlying evolutionary radiation. Acoustic diversity within bushcricket genera varies from very low with a more or less uniform pattern of the male calling song (cf.…”

Section: Introductionmentioning

confidence: 99%

Evolution and systematics of Green Bush-crickets (Orthoptera: Tettigoniidae: Tettigonia) in the Western Palaearctic: testing concordance between molecular, acoustic, and morphological data

Grzywacz

Heller²,

Warchałowska‐Śliwa

et al. 2016

Org Divers Evol

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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: BA^-composed of all sampled populations of Tettigonia viridissima and the Tettigonia vaucheriana complex, BB^-comprising Tettigonia caudata, Tettigonia uvarovi, and the Tettigonia armeniaca complex, and BC^-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.

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Section: Introductionmentioning

confidence: 99%

Evolution and systematics of Green Bush-crickets (Orthoptera: Tettigoniidae: Tettigonia) in the Western Palaearctic: testing concordance between molecular, acoustic, and morphological data

Grzywacz

Heller²,

Warchałowska‐Śliwa

et al. 2016

Org Divers Evol

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“…The cool mesoclimate of wet habitats compared to dryer ones might explain why nymphs of C. montanus generally hatch approximately a month later than those of its sibling species C. parallelus (Ingrisch and Köhler 1998b;Hochkirch and Lemke 2011). During development nymphs are known to become more and more thermophilous and prefer warm patches with a low humidity (Ingrisch 1980).…”

Section: Microhabitat Preferencesmentioning

confidence: 97%

Mobility and microhabitat utilization in a flightless wetland grasshopper, Chorthippus montanus (Charpentier, 1825)

2011

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Wetlands are among the most threatened habitat types on our planet. Their decline will probably even intensify under climate change. Many biota are strongly dependent on wetlands, including a large number of invertebrate species. The populations of such hygrophilous species become increasingly disconnected due to the ongoing fragmentation of their habitats. This is particularly true for species with reduced dispersal capacities, such as flightless insects. We studied mobility, population size and microhabitat utilization in a population of an endangered grasshopper species, the Water-meadow Grasshopper, Chorthippus montanus. Our mark-recapture study revealed that the cumulative movement distance of the adults was on average 23.5 m with a maximum of 104 m. The microhabitat analysis showed that both sexes of C. montanus preferred warmer patches with greater radiation than measured at control sites. Niche overlap among sexes was stronger than expected by chance, while niche overlap between insects and controls showed the opposite pattern. Our results suggest that C. montanus is strongly restricted to its habitat and is probably not able to cross larger distances through unsuitable vegetation. Hence, we assume that the populations of this flightless insect species are strongly isolated. However, the effect of the rare macropterous morph of C. montanus on gene flow remains unknown. Wetland restoration is crucial to reconnect the existing wetland patches in Central Europe and thereby reduce the negative effects of habitat fragmentation on wetland species.

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“…For the native population, hybridization can have variable consequences ranging from negative fitness effects, such as the loss of locally adapted alleles, outbreeding depression and displacement by gene pool swamping (Arntzen & Thorpe 1999; Vorburger & Reyer 2003; Schmeller et al. 2005, Hochkirch & Lemke 2011; Sacks et al. 2011), to positive effects caused by hybrid vigour (Drake 2006; Fitzpatrick & Shaffer 2007; Pfennig 2007).…”

Section: Introductionmentioning

confidence: 99%

Rapid genetic assimilation of native wall lizard populations (Podarcis muralis) through extensive hybridization with introduced lineages

2012

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The Common Wall Lizard (Podarcis muralis) has established more than 150 non-native populations in Central Europe, stemming from eight geographically distinct evolutionary lineages. While the majority of these introduced populations are found outside the native range, some of these populations also exist at the northern range margin in southwestern Germany. To (i) infer the level of hybridization in contact zones of alien and native lineages; and (ii) compare the genetic diversity among purebred introduced, native and hybrid populations, we used a combination of maternally inherited markers (mtDNA: cytb) and Mendelian markers (microsatellites). Our results suggest a rapid genetic assimilation of native populations by strong introgression from introduced lineages. Discordant patterns of mtDNA and nDNA variation within hybrid populations may be explained by directed mate choice of females towards males of alien lineages. In contrast to previous studies, we found a nonlinear relationship between genetic diversity and admixture level. The genetic diversity of hybrid populations was substantially higher than in introduced and native populations belonging to a single lineage, but rapidly reaching a plateau of high genetic diversity at an admixture level of two. However, even introduced populations with low founder sizes and from one source population retained moderate levels of genetic diversity and no evidence for a genetic bottleneck was found. The extent of introgression and the dominance of alien haplotypes in mixed populations indicate that introductions of non-native lineages represent a serious threat to the genetic integrity of native populations due to the rapid creation of hybrid swarms.

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Asymmetric mate choice, hybridization, and hybrid fitness in two sympatric grasshopper species

Cited by 31 publications

References 55 publications

Evolution and systematics of Green Bush-crickets (Orthoptera: Tettigoniidae: Tettigonia) in the Western Palaearctic: testing concordance between molecular, acoustic, and morphological data

Evolution and systematics of Green Bush-crickets (Orthoptera: Tettigoniidae: Tettigonia) in the Western Palaearctic: testing concordance between molecular, acoustic, and morphological data

Mobility and microhabitat utilization in a flightless wetland grasshopper, Chorthippus montanus (Charpentier, 1825)

Rapid genetic assimilation of native wall lizard populations (Podarcis muralis) through extensive hybridization with introduced lineages

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