Genetic diversity and population history of the migratory catfishes Pangasianodon hypophthalmus and Pangasius bocourti in the Cambodian Mekong River

Polymerase chain reaction (PCR) restriction fragment length polymorphism analysis of mitochondrial DNA was applied to the genetic structure and evolutionary history of the more ancestral Pangasianodon hypophthalmus (n = 82), and the recently speciated catfish Pangasius bocourti (n = 90) from the Cam...

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Bibliographic Details
Published in:Fisheries science 2006-06, Vol.72 (3), p.469-476
Main Authors: So, N.(Katholieke Univ. Leuven (Belgium)), Van Houdt, J.K.J, Volckaert, F.A.M
Format: Article
Language:English
Subjects:
ADN
Birds
bottleneck
CAMBODGE
CAMBODIA
CAMBOYA
Catfish
DNA
ESTRUCTURA DE LA POBLACION
fisheries
Freshwater
Gene flow
Genetic diversity
Genetic structure
GENETIC VARIATION
HISTOIRE
HISTORIA
HISTORY
MEKONG
MEKONG RIVER
MITOCHONDRIA
Mitochondrial DNA
MITOCHONDRIE
MITOCONDRIA
Pangasianodon hypophthalmus
PANGASIIDAE
Pangasius bocourti
PANGASIUS SPP
Polymerase chain reaction
Polymorphism
Population
population genetics
Population growth
POPULATION STRUCTURE
restriction fragment length polymorphism
RIO MEKONG
Rivers
STRUCTURE DE LA POPULATION
VARIACION GENETICA
VARIATION GENETIQUE
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Summary:Polymerase chain reaction (PCR) restriction fragment length polymorphism analysis of mitochondrial DNA was applied to the genetic structure and evolutionary history of the more ancestral Pangasianodon hypophthalmus (n = 82), and the recently speciated catfish Pangasius bocourti (n = 90) from the Cambodian Mekong River. Both pangasiids were characterized by a lack of genetic population structure that may result from high levels of contemporary gene flow. Genetic diversity was lower in P. hypophthalmus than in P. bocourti. However, a different evolutionary history was inferred for both species based on genealogical and demographic analyses (mismatch analysis, Tajima’s D‐ and Fu’s FS‐tests). The genetic profile of the more ancestral P. hypophthalmus shows indications of a recent population bottleneck, whereas the recently speciated P. bocourti shows signatures of historical population expansion. This study stresses the importance of preserving the migration routes in the Cambodian Mekong basin in order to maintain the genetic diversity and long‐term integrity of both species.
ISSN:0919-9268
1444-2906
DOI:10.1111/j.1444-2906.2006.01174.x