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Ndiwa T. C., Nyingi D. W., Agnèse Jean-François. (2014). An important natural genetic resource of Oreochromis niloticus (Linnaeus, 1758) threatened by aquaculture activities in Loboi drainage, Kenya. Plos One, 9 (9), e106972. ISSN 1932-6203

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Lien direct chez l'éditeur doi:10.1371/journal.pone.0106972

Titre
An important natural genetic resource of Oreochromis niloticus (Linnaeus, 1758) threatened by aquaculture activities in Loboi drainage, Kenya
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000341774800036
AuteursNdiwa T. C., Nyingi D. W., Agnèse Jean-François.
SourcePlos One, 2014, 9 (9), p. e106972. p. e106972 ISSN 1932-6203
RésuméThe need to improve food security in Africa through culture of tilapias has led to transfer of different species from their natural ranges causing negative impacts on wild fish genetic resources. Loboi swamp in Kenya is fed by three hot springs: Lake Bogoria Hotel, Chelaba and Turtle Springs, hosting natural populations of Oreochromis niloticus. The present study aimed at better genetic characterization of these threatened populations. Partial mtDNA sequences of the D-loop region and variations at 16 microsatellite loci were assessed in the three hot spring populations and compared with three other natural populations of O. niloticus in the region. Results obtained indicated that the hot spring populations had mitochondrial and nuclear genetic variability similar to or higher than the large closely related populations. This may be attributed to the perennial nature of the hot springs, which do not depend on rainfall but rather receive permanent water supply from deep aquifers. The study also revealed that gene flow between the three different hot spring populations was sufficiently low thus allowing their differentiation. This differentiation was unexpected considering the very close proximity of the springs to each other. It is possible that the swamp creates a barrier to free movement of fish from one spring to the other thereby diminishing gene flow. Finally, the most surprising and worrying results were that the three hot spring populations are introgressed by mtDNA genes of O. leucostictus, while microsatellite analysis suggested that some nuclear genes may also have crossed the species barrier. It is very likely that the recent intensification of aquaculture activities in the Loboi drainage may be responsible for these introgressions. Taking into account the importance of these new genetic resources, protection and management actions of the Loboi swamp should be accorded top priority to prevent the loss of these spring populations.
Plan de classementLimnologie biologique / Océanographie biologique [034] ; Ressources halieutiques [040]
Descr. géo.KENYA
LocalisationFonds IRD [F B010062553]
Identifiant IRDfdi:010062553
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010062553

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