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Title: The nature of intraspecific biodiversity in Atlantic salmon (Salmo salar L.)
Author: Cauwelier, Eef
ISNI:       0000 0001 3525 3401
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2007
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The nature of intraspecific biodiversity in the Atlantic salmon was examined, more particularly the issues related to mating between non-natives and natives, and the genetic basis of complex traits, which could be important to aquaculture. These issues were examined in parental, F1, BC1 and F2 crosses between extremely genetically differentiated populations, i.e. a non-anadromous Canadian and anadromous Scottish populations, and the experiments were carried out in a hatchery. Outbreeding depression, which is defined as the reduction in the offspring fitness caused by the mating of unrelated individuals, was measured directly in relation to survival and indirectly through traits associated with early growth and development in parental, F1 and BC1 cross types.  The genetic basis of smolification, seawater tolerance and resistance to PKD was investigated in F2 families. Reduced survival, which was asymmetrical in the BC1, was observed in the F1 and BC1 cross types, with offspring from one backcross being unviable, whilst viable offspring were obtained from the reciprocal backcross.  Growth and development patterns were altered in the F1 and BC1 compared to the parental controls, and could be explained by both maternal and additive effects. QTL analysis revealed a number of markers associated with the various phenotypic traits related to smolification, seawater survival and PKD resistance, suggesting polygenic control. Reduced survival and altered growth and developmental patterns in the hybrids could be expected to lead to even more severe outbreeding depression in a selective environment.  However, there was also indirect evidence for outbreeding depression in relation to seawater survival and PKD resistance.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available