Thermal plasticity in farmed, wild and hybrid Atlantic salmon during early development: has domestication caused divergence in low temperature tolerance?

BMC Evolutionary Biology
Monica F SolbergK A Glover

Abstract

In the past three decades, millions of domesticated Atlantic salmon Salmo salar L. have escaped from farms into the wild. Their offspring display reduced survival in the natural environment, which demonstrates that gene-flow is likely to have a negative effect on wild populations. However, inter-population differences in introgression of farmed salmon have been observed, and the underlying ecological mechanisms remain enigmatic. We hypothesised that domestication-driven divergence in tolerance to low temperatures during early development may contribute to lower survival of farmed salmon offspring in the wild, which in turn, may influence patterns of introgression among populations exposed to different temperature regimes. We reared the offspring of 35 families of wild, farmed and hybrid origin at three temperatures (3.9, 5.6 and 12°C) from the onset of exogenous feeding and throughout their first summer. Thermal reaction norms for growth and survival were investigated along the gradient. The main results of this study, which is based upon the analysis of juvenile salmon from five wild strains, two farmed strains and two hybrid strains, can be summarised as; (i) salmon of all origins were able to successfully initiate feeding at...Continue Reading

References

Sep 28, 2000·Proceedings. Biological Sciences·I A FlemingA Lamberg
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Feb 3, 2009·Trends in Ecology & Evolution·Benjamin M BolkerJada-Simone S White
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Citations

Jul 3, 2021·Animals : an Open Access Journal From MDPI·Ricardo CaladoMiguel C Leal

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Methods Mentioned

BETA
genotyping
two hybrid

Software Mentioned

Dryad
lme4
lattice
FAP
GeneMapper
lmerTest
R

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