The study of molecular variation in Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.)

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dc.contributor.advisor Cross, Thomas F. en
dc.contributor.advisor McGinnity, Philip en O'Toole, Ciar 2015-08-20T09:26:22Z 2014 2014
dc.identifier.citation O'Toole, Ciar. 2014. The study of molecular variation in Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.). PhD Thesis, University College Cork. en
dc.identifier.endpage 218
dc.description.abstract Polymorphic microsatellite DNA loci were used here in three studies, one on Salmo salar and two on S. trutta. In the case of S. salar, the survival of native fish and non-natives from a nearby catchment, and their hybrids, were compared in a freshwater common garden experiment and subsequently in ocean ranching, with parental assignment utilising microsatellites. Overall survival of non-natives was 35% of natives. This differential survival was mainly in the oceanic phase. These results imply a genetic basis and suggest local adaptation can occur in salmonids across relatively small geographic distances which may have important implications for the management of salmon populations. In the first case study with S trutta, the species was investigated throughout its spread as an invasive in Newfoundland, eastern Canada. Genetic investigation confirmed historical records that the majority of introductions were from a Scottish hatchery and provided a clear example of the structure of two expanding waves of spread along coasts, probably by natural straying of anadromous individuals, to the north and south of the point of human introduction. This study showed a clearer example of the genetic anatomy of an invasion than in previous studies with brown trout, and may have implications for the management of invasive species in general. Finally, the genetics of anadromous S. trutta from the Waterville catchment in south western Ireland were studied. Two significantly different population groupings, from tributaries in geographically distinct locations entering the largest lake in the catchment, were identified. These results were then used to assign very large rod caught sea trout individuals (so called “specimen” sea trout) back to region of origin, in a Genetic Stock Identification exercise. This suggested that the majority of these large sea trout originated from one of the two tributary groups. These results are relevant for the understanding of sea trout population dynamics and for the future management of this and other sea trout producing catchments. This thesis has demonstrated new insights into the population structuring of salmonids both between and within catchments. While these chapters look at the existence and scale of genetic variation from different angles, it might be concluded that the overarching message from this thesis should be to highlight the importance of maintaining genetic diversity in salmonid populations as vital for their long-term productivity and resilience. en
dc.description.sponsorship Department of Agriculture, Food and the Marine, Ireland (Beaufort Maritime Research Awards Fish Population Genetics) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2014, Ciar O'Toole. en
dc.rights.uri en
dc.subject Atlantic salmon en
dc.subject Salmo salar en
dc.subject Salmo trutta en
dc.subject Population genetics en
dc.subject Brown trout en
dc.subject Molecular variation en
dc.title The study of molecular variation in Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.) en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en
dc.description.version Accepted Version
dc.contributor.funder Department of Agriculture, Food and the Marine, Ireland en
dc.description.status Not peer reviewed en Biological, Earth & Environmental Sciences en
dc.check.reason This thesis is due for publication or the author is actively seeking to publish this material en
dc.check.opt-out No en
dc.thesis.opt-out false
dc.check.embargoformat E-thesis on CORA only en
dc.internal.conferring Autumn Conferring 2014

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© 2014, Ciar O'Toole. Except where otherwise noted, this item's license is described as © 2014, Ciar O'Toole.
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