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Geographical and ecological distributions of frog hemiclones suggest occurrence of both ‘General-Purpose Genotype’ and ‘Frozen Niche Variation’ clones

Abstract : Asexuals often occupy broad geographical and ecological ranges. Two models have been proposed to explain the ubiquity of asexuals: the General-Purpose Genotype (GPG) and the Frozen Niche Variation (FNV) model. According to these models, asexuals differ in their ecological niche width and may occupy narrow specialist niches or ubiquitous niches. A thousand water frogs from 37 different populations located in France in different habitats were studied, and two (hemi)clonal hybrid types were identified genetically, Rana esculenta and R. grafi. Altogether, 13 hemiclones were identified both in R. grafi and R. esculenta. Three of these were geographically and ecologically widely distributed, and usually very common in populations. In contrast, the remaining 10 hemiclones had small geographical ranges and were restricted to special habitat types, suggesting ecological niche specialization. The results suggest that in hybridogenetic water frogs GPG and FNV hemiclones coexist.
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Submitted on : Wednesday, July 13, 2016 - 3:16:13 PM
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A. Pagano, David Lesbarrères, R. O’hara, A. Crivelli, M. Veith, et al.. Geographical and ecological distributions of frog hemiclones suggest occurrence of both ‘General-Purpose Genotype’ and ‘Frozen Niche Variation’ clones. Journal of Zoological Systematics and Evolutionary Research, Wiley, 2008, 46 (2), pp.162-168. ⟨10.1111/j.1439-0469.2007.00439.x⟩. ⟨hal-01345354⟩

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