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- W2013803400 abstract "Abstract Countergradient variation ( CGV ) is defined as genetic variation that counteracts the negative influences of the physical environment, minimising phenotypic variability along an environmental gradient. CGV is thought to have relevance in predicting the response of organisms to climate variability and change. To test the hypothesis that growth rate increased with latitude, consistent with CGV , young‐of‐the‐year ( YOY ) Arctic charr, Salvelinus alpinus , were examined along a ~27° latitudinal gradient in central and eastern Canada. Growth rates were estimated from fork lengths standardised by the thermal opportunity for growth based on experienced water temperatures derived using otolith oxygen stable isotopes. Results demonstrated patterns consistent with CGV , where northern populations demonstrated faster growth rates. A secondary aim was to test for similar geographical patterns in otolith‐inferred metabolic rates, which reflect the energetic costs of standard metabolic rate ( SMR ) and other processes such as feeding, locomotion, thermoregulation, reproduction and growth. Results demonstrated a significant, positive relationship between otolith‐inferred metabolic rate and latitude, which may reflect an increase in one, or a combination, of the above‐noted physiological processes. The similar latitudinal pattern in growth and otolith‐inferred metabolic rates suggests greater intake of food per unit of time by northern fish. The phenotypic variation in physiological traits observed here demonstrates the significant adaptability of Arctic charr to different thermal regimes with different growing season lengths. Determining the relative contributions of phenotypic plasticity and genetic variation to the observed latitudinal variation will be critical to predicting the responses of Arctic charr to climate change more accurately." @default.
- W2013803400 created "2016-06-24" @default.
- W2013803400 creator A5002095584 @default.
- W2013803400 creator A5003248702 @default.
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- W2013803400 creator A5036643309 @default.
- W2013803400 date "2014-07-19" @default.
- W2013803400 modified "2023-10-09" @default.
- W2013803400 title "Latitudinal variation in growth and otolith-inferred field metabolic rates of Canadian young-of-the-year Arctic charr" @default.
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- W2013803400 doi "https://doi.org/10.1111/eff.12166" @default.
- W2013803400 hasPublicationYear "2014" @default.
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