Presumable incipient hybrid speciation of door snails in previously glaciated areas in the Caucasus
| Autor: | Eva L. Koch, Frank Walther, Bernhard Hausdorf, Marco T. Neiber |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine Genetic Speciation media_common.quotation_subject Acclimatization Snails Biology 010603 evolutionary biology 01 natural sciences DNA Mitochondrial 03 medical and health sciences Hybrid zone Genetics Animals Ice Cover Amplified Fragment Length Polymorphism Analysis Clade Molecular Biology Ecology Evolution Behavior and Systematics Ecosystem media_common Hybrid Ecology Altitude Haplotype Speciation Fixation (population genetics) 030104 developmental biology Haplotypes Evolutionary biology Hybridization Genetic Hybrid speciation Selective sweep Biologie |
| Popis: | Homoploid hybrid speciation, speciation by hybridization without a change in chromosome number, may be the result of an encounter of closely related species in a habitat that is different from that usually occupied by these species. In the northwestern Caucasus the land snail species Micropontica caucasica and M. circassica form two distinct entities with little admixture at low and intermediate altitudes. However, at higher altitudes in the Lagonaki plateau, which were repeatedly glaciated, Micropontica populations with intermediate characters occur. Admixture analyses based on AFLP data demonstrated that the populations from the Lagonaki plateau are homoploid hybrids that now form a cluster separate from the parental species. The Lagonaki populations are characterized by a mtDNA haplotype clade that has been found in the parental species only once. The fixation of this haplotype clade in most hybrid populations suggests that these haplotypes are better adapted to the cooler conditions in high altitude habitats and have replaced the haplotypes of the parental species in a selective sweep. The fixation of a presumably adaptive mitochondrial haplotype clade in the Lagonaki populations is an important step towards speciation under the differential fitness species concept. |
| Databáze: | OpenAIRE |
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