Humid forest refugia, speciation and secondary introgression between evolutionary lineages: differentiation in a Near Eastern brown frog, Rana macrocnemis

Tarkhnishvili, David and Hille, Axel and BÖhme, Wolfgang (2001) Humid forest refugia, speciation and secondary introgression between evolutionary lineages: differentiation in a Near Eastern brown frog, Rana macrocnemis. Biological Journal of the Linnean Society, 74 (2). pp. 141-156. ISSN 1095-8312

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Abstract

Brown frogs of the complex Rana macrocnemis demonstrate various degrees of differentiation between the two widespread forms, macrocnemis and camerani, in different parts of Anatolia, the Caucasus Isthmus and northern Iran. In order to reveal whether or not the forms represent monophyletic evolutionary lineages, we analysed the geographic distribution of characters of external morphology, alleles at three polymorphic allozyme loci and mitochondrial DNA haplotypes. All three character sets showed a highly congruent pattern in a limited area of humid forests in the south-west Caucasus. Frogs from this area (form macrocnemis) represent a monophyletic lineage which forms a narrow hybrid zone with populations of camerani inhabiting the southern Caucasus and north-east Turkey. However, in other parts of the group's range, hybridization between the two lineages resulted in the merger of forms and the formation of a clinal pattern of variations. The role of landscape-dependent diversifying selection in the evolution of the group is discussed. Conceptual difficulties in delimiting the borders of subspecies are pointed out.

Item Type: Article
Subjects: Q Science > Evolution
Q Science > Ecology
Q Science > QH Natural history > QH426 Genetics
Q Science > QL Zoology
Divisions: Institutes > Institute of Ecology
Depositing User: Prof. David Tarkhnishvili
Date Deposited: 27 Jan 2014 11:57
Last Modified: 27 Jan 2014 11:57
URI: http://eprints.iliauni.edu.ge/id/eprint/609

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