Inferring the patterns and causes of geographic variation in Ephippiger ephippiger (Orthoptera, Tettigoniidae) using geographical information systems (GIS)

Kidd, David M.

doi:10.1006/bijl.2000.0443

Cited by 20 publications

(58 citation statements)

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“…We can conclude that the cruciger and cunii forms are not taxonomically valid as they are polyphyletic and consist of a number of divergent and possibly ancient haplotypes that correspond to major river valleys in the region rather than taxonomy, behaviour or morphology. These conclusions conform closely to those of Oudman et al (1990) who suggested that the whole complex be termed the variable species E. e. diurnus, with broad and relatively independent clinal variation, although a firm conclusion should await further sampling (and Kidd and Ritchie, 2000 seemed to detect some coincidence in these clines around the area of the Aude river).…”

Section: Discussionsupporting

confidence: 88%

“…Similar geographically structured mtDNA variation within Pyrenean samples was suggested in a previous mtDNA RFLP analysis (Ritchie et al, 2001), although a phylogeny based on RAPDs did not show these divisions (Ritchie et al, 1997). The extent of sequence divergence is surprising, as bushcrickets from all three valleys are morphologically and behaviourally very similar and have previously been shown to have low genetic distances at allozyme loci (Oudman et al, 1990;Kidd and Ritchie, 2000;Spooner, 2005). The mountain ranges (B2500 m in altitude) between the three river valleys appear to be severely limiting gene flow between them.…”

Section: Discussionsupporting

confidence: 60%

“…A previous RAPD-based phylogeny also showed a genetic subdivision within the species, although this analysis was geographically limited (Ritchie et al, 1997). Partial Mantel tests and other analyses implied that most intraspecific variation originated through isolation in refugia, although environmental factors were found to influence body size (Kidd and Ritchie, 2000) and the pattern of mtDNA variation (Ritchie et al, 2001). E. e. vitium was thought likely to have migrated west across Europe from a refugium in the east, for example, the Balkans or Caucasus, whereas the other forms (cunii and cruciger) showed some geographic structuring and were thought to have possibly arisen from multiple Iberian refugia (Ritchie et al, 2001).…”

Section: Introductionmentioning

confidence: 54%

“…This variation is centred in Southern France (the Eastern Pyrenees and Mediterranean coast), and recent evidence suggests that it results from secondary contact after differentiation in Pleistocene refugia (Kidd and Ritchie, 2000;Ritchie et al, 2001). However, the time scale, locations of refugia and patterns of expansion remain obscure.…”

Section: Introductionmentioning

confidence: 96%

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An unusual phylogeography in the bushcricket Ephippiger ephippiger from Southern France

Spooner

Ritchie

2006

Heredity

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Pleistocene glaciations have played a major role in species divergence. The bushcricket Ephippiger ephippiger shows unusual patterns of intraspecific variation in multiple traits across Southern Europe. This is centred in Southern France, and evidence implies that it results from secondary contact after differentiation in Pleistocene refugia. However, the possible time scales involved, locations of the refugia and patterns of expansion remain obscure. This study sequenced the COII (507 BP) and cyt b (428 BP) mitochondrial genes to examine the intraspecific phylogeography of Western European samples of E. ephippiger. A minimum evolution tree revealed little resolution between described subspecies of E. ephippiger. Strikingly, populations from the Pyrenees and Mediterranean coastal region contained a complex genetic structure corresponding to major river valleys, independent of the traditional taxonomy. Samples of the subspecies E. e. vitium formed a distinct clade, perhaps supporting their taxonomic status. However, other forms (cruciger and cunii) were not genetically distinct, which is surprising given differences in their morphology and behaviour. The extent of the genetic divergence between Pyreneen valleys is unexpectedly deep, with average Tamura-Nei distances of around 14% (net distances of 11%) separating the main clades of coding COII sequences. Cyt b showed a similar pattern, but was confounded by some non-coding probable pseudogenes. If a conventional insect molecular clock is applied, these cryptic clades must predate the Pleistocene, and hypotheses for their history are discussed. However, mtDNA divergence in Ephippiger is not evolving in a clock-like manner, because a likelihood ratio test rejects clock assumptions for the COII sequences.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 96%

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An unusual phylogeography in the bushcricket Ephippiger ephippiger from Southern France

Spooner

Ritchie

2006

Heredity

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“…We examine how two morphological characters (forewing morphology and shape of antennae) and courtship song change across the hybrid zone. The integration of GIS into hybrid zone research began with Kohlmann et al (1988) and was developed by Kidd and Ritchie (2000); see also Swenson (2008). Second, we study the strength of selection against hybrids and investigate which traits may be under stronger selection.…”

Section: Introductionmentioning

confidence: 99%

Variation in complex mating signals in an “island” hybrid zone betweenStenobothrusgrasshopper species

Sradnick¹,

Klöpfel²,

Elsner³

et al. 2016

Ecology and Evolution

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Two grasshopper species Stenobothrus rubicundus and S. clavatus were previously shown to meet in a narrow hybrid zone on Mount Tomaros in northern Greece. The species are remarkable for their complex courtship songs accompanied by conspicuous movements of antennae and wings. We analyzed variations in forewing morphology, antenna shape, and courtship song across the hybrid zone using a geographic information system, and we documented three contact zones on Mount Tomaros. All male traits and female wings show abrupt transitions across the contact zones, suggesting that these traits are driven by selection rather than by drift. Male clines in antennae are displaced toward S. clavatus, whereas all clines in wings are displaced toward S. rubicundus. We explain cline discordance as depending on sexual selection via female choice. The high covariance between wings and antennae found in the centers of all contact zones results from high levels of linkage disequilibria among the underlying loci, which in turn more likely results from assortative mating than from selection against hybrids. The covariance is found to be higher in clavatus‐like than rubicundus‐like populations, which implies asymmetric assortative mating in parental‐like sites of the hybrid zone and a movement of the hybrid zone in favor of S. clavatus.

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Evolution of host- and habitat association in the wood-feeding cockroach, Cryptocercus

2002

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Members of the cockroach genus Cryptocercus are subsocial insects that live in temperate forests and feed on decomposing logs. At present, seven species are recognized worldwide: four in the eastern USA, one in the western USA, and one each in Russia and China. Genetic variation within and among the Nearctic species has been characterized extensively in previous studies. However, whether there has been a corresponding divergence in the host and habitat association of Cryptocercus species is not known. Here, we report on differences in host and habitat association among six of the seven Cryptocercus species, estimated from field observations, elevation data, and land cover data. Our results indicated that the eastern and western USA species differ from one another in their distribution patterns, abundance, and habitat association. The eastern USA species are associated largely with deciduous forests, whereas the western USA and the Russian species are associated with evergreen forests. Thus, the eastern USA species, which are evolutionarily the most recent ones, have adapted to a different set of tree species relative to the basal species. There were also differences in the habitat association of the various species. Specifically, in the eastern USA, Cryptocercus darwini, evolutionarily the most recent species, occupied a habitat that is predominantly at low elevation [<400 m above sea level (ASL)] while all the other Nearctic species and the Russian species occupied a habitat that is at relatively higher elevations (>400 m ASL). Mapping of the above traits on a phylogenetic tree revealed that the evolutionary trend in Cryptocercus with regard to host and habitat association has been toward the utilization of low elevation habitats dominated by deciduous forests. © 2002 The Linnean Society of London, Biological Journal of the Linnean Society, 2002, 75, 163–172.

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Inferring the patterns and causes of geographic variation in Ephippiger ephippiger (Orthoptera, Tettigoniidae) using geographical information systems (GIS)

Cited by 20 publications

References 0 publications

An unusual phylogeography in the bushcricket Ephippiger ephippiger from Southern France

An unusual phylogeography in the bushcricket Ephippiger ephippiger from Southern France

Variation in complex mating signals in an “island” hybrid zone betweenStenobothrusgrasshopper species

Evolution of host- and habitat association in the wood-feeding cockroach, Cryptocercus

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