Genetic variability in the Magdalena River turtle, Podocnemis lewyana (Duméril 1852) in the Mompox Depression, Colombia

ABSTRACT: Two populations of the endangered Magdalena River turtle, Podocnemis lewyana, separated by 55 km in the Mom-pos Depression were sampled to quantify levels of genetic variation and inspect for evidence of genetic structure. Allozyme analyses resolved 22 presumptive gene loci, but only one r...

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Autores:
Restrepo Isaza, Adriana
Bock Garnier, Brian Carl
Páez Nieto, Vivian Patricia
Tipo de recurso:
Article of investigation
Fecha de publicación:
2008
Institución:
Universidad de Antioquia
Repositorio:
Repositorio UdeA
Idioma:
eng
OAI Identifier:
oai:bibliotecadigital.udea.edu.co:10495/21215
Acceso en línea:
http://hdl.handle.net/10495/21215
https://revistas.udea.edu.co/index.php/actbio/article/view/4741
Palabra clave:
Allozymes
Alozimas
Genetic variability
Variación genética
Population structure
Estructura de la población
Podocnemididae
Podocnemis lewyana
http://aims.fao.org/aos/agrovoc/c_24813
http://aims.fao.org/aos/agrovoc/c_15975
http://aims.fao.org/aos/agrovoc/c_6115
Rights
openAccess
License
http://creativecommons.org/licenses/by-nc-sa/2.5/co/
Description
Summary:ABSTRACT: Two populations of the endangered Magdalena River turtle, Podocnemis lewyana, separated by 55 km in the Mom-pos Depression were sampled to quantify levels of genetic variation and inspect for evidence of genetic structure. Allozyme analyses resolved 22 presumptive gene loci, but only one resulted polymorphic. Genotype proportions at this locus departed from those expected under Hardy-Weinberg equilibrium, showing heterozygote deficiencies in both populations. However, allele frequencies at the locus did not differ between the two sites. The level of genetic variability documented is one of the lowest yet reported for a turtle species, and may reflect either a historical or recent bottleneck event. The lack of evidence for genetic structure suggests gene flow among the sites, at least historically, but the heterozygote deficiencies at each site also imply that inbreeding may be occurring presently within each deme.