Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/43553
Título: Less can be more: loss of MHC functional diversity can reflect adaptation to novel conditions during fish invasions
Autores/as: Monzón-Argüello, Catalina 
Garcia de Leaniz, Carlos
Gajardo, Gonzalo
Consuegra, Sofia
Clasificación UNESCO: 2510 Oceanografía
Palabras clave: Aquaculture escapes
Biological invasions
Oncorhynchus mykiss
Rainbow trout
Rapid evolution, et al.
Fecha de publicación: 2013
Publicación seriada: Ecology and Evolution 
Resumen: The ability of invasive species to adapt to novel conditions depends on population size and environmental mismatch, but also on genetic variation. Away from their native range, invasive species confronted with novel selective pressures may display different levels of neutral versus functional genetic variation. However, the majority of invasion studies have only examined genetic variation at neutral markers, which may reveal little about how invaders adapt to novel environments. Salmonids are good model systems to examine adaptation to novel pressures because they have been translocated all over the world and represent major threats to freshwater biodiversity in the Southern Hemisphere, where they have become invasive. We examined patterns of genetic differentiation at seven putatively neutral (microsatellites) loci and one immune‐related major histocompatibility complex (MHC class II‐β) locus among introduced rainbow trout living in captivity (farmed) or under natural conditions (naturalized) in Chilean Patagonia. A significant positive association was found between differentiation at neutral and functional markers, highlighting the role of neutral evolutionary forces in shaping genetic variation at immune‐related genes in salmonids. However, functional (MHC) genetic diversity (but not microsatellite diversity) decreased with time spent in the wild since introduction, suggesting that there was selection against alleles associated with captive rearing of donor populations that do not provide an advantage in the wild. Thus, although high genetic diversity may initially enhance fitness in translocated populations, it does not necessarily reflect invasion success, as adaptation to novel conditions may result in rapid loss of functional MHC diversity.
URI: http://hdl.handle.net/10553/43553
DOI: 10.1002/ece3.701
Fuente: Ecology and Evolution, v. 3 (10), p. 3359-3368
Colección:Artículos
miniatura
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