Genetic diversity in chilean populations of rainbow trout, oncorhynchus mykiss
Author
dc.contributor.author
Cárcamo, Claudia B.
Author
dc.contributor.author
Díaz, Nelson F.
Author
dc.contributor.author
Winkler, Federico M.
Admission date
dc.date.accessioned
2015-08-20T15:16:26Z
Available date
dc.date.available
2015-08-20T15:16:26Z
Publication date
dc.date.issued
2015
Cita de ítem
dc.identifier.citation
Lat. Am. J. Aquat. Res., 43(1): 59-70, 2015
en_US
Identifier
dc.identifier.issn
0718560X
Identifier
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10.3856/vol43-issue1-fulltext-6
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/132967
Abstract
dc.description.abstract
The rainbow trout Oncorhynchus mykiss, was first introduced in Chile between 1905 and 1920 and is currently widely distributed in Chile from Antofagasta (23°S) to Patagonia (55ºS). The broad range of the geographic and climatic distributions of this species in Chile offers a unique opportunity to study the effect of naturalization of an introduced species on its genetic variability. It is of particular importance to observe the genetic variability of populations in the northern range of this species distribution, in a transition zone where a Mediterranean-type climate changes to an arid climate. The present study analyzed allozymic variability and distribution within and between populations of O. mykiss from the river basins of Elqui and Limarí rivers, and six culture strains, using starch-gel protein electrophoresis. Populations were found to be in Hardy-Weinberg equilibrium and the average values of He (0.045), polymorphism (13.9%) and allele per locus (1.19) are similar to rainbow trout in its native distributional range. About 77.8% of the genetic variability was within population, similar to the variability reported for wild populations in the northern hemisphere. However, a marked genetic differentiation between wild populations was also found. This is likely to be the consequence of initial founder effects followed by subsequent introgression of resident populations caused by reseeding with trout of different origins in both basins.