Genetic subdivision, glacial refugia and postglacial recolonization in the golden-striped salamander, Chioglossa lusitanica (Amphibia : Urodela)

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

alexandrino, j (Autor) FCUP; froufe, e (Autor) Outra; arntzen, jw (Autor) Outra; ferrand, n (Autor) FCUP

Revista

Título: Molecular Ecology

Vol. 9

Páginas: 771-781

ISSN: 0962-1083

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 92 Citações

Scopus - 94 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências biológicas

Outras Informações

ID Authenticus: P-000-ZZ5

DOI: 10.1046/j.1365-294x.2000.00931.x

Abstract (EN): The golden-striped salamander (Chioglossa lusitanica) is an ecologically specialized species, endemic to north-western Iberia. Patterns of genetic variation were assessed at seven polymorphic enzyme loci and one mitochondrial DNA (mtDNA) marker (cytochrome b) in 17 populations across its range. Estimates of enzyme genetic diversity revealed a high degree of genetic subdivision (F-ST = 0.68), mainly attributable to the existence of two groups of populations. The groups were located, respectively, north and south of the Mondego River, indicating that this river coincided with a major historical barrier to gene flow. A significant decrease in genetic variability from the Mondego northwards was associated with the Douro and Minho rivers. mtDNA sequence variation revealed a congruent pattern of two haplotype groups (d = 2.2%), with a geographical distribution resembling that of allozymes. The pattern and depth of genetic variation is consistent with the following hypotheses: (i) subdivision of an ancestral range of the species prior to the middle Pleistocene; (ii) secondary contact between populations representing historical refugia; (iii) relatively recent range expansion giving rise to the northern part of the species range; and (iv) loss of genetic variation through founder effects during range expansion across major rivers.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11