Adaptation of redband trout in desert and montane environments

Narum, Shawn R.; Campbell, Nathan R.; Kozfkay, Christine C.; Meyer, Kevin A.

doi:10.1111/j.1365-294x.2010.04839.x

Cited by 76 publications

(81 citation statements)

References 95 publications

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“…This is similar to previous studies of wild fish populations that typically identify between 1% and 10% of the loci surveyed as outlier loci (Bradbury et al., 2013; Narum et al., 2010). We recognize that not all our outlier loci are necessarily a result of differences in local extrinsic selection.…”

Section: Discussionmentioning

confidence: 99%

“…Recent outlier locus studies of salmonid fishes have primarily compared wild populations at different spatial scales (Freamo, O'Reilly, Berg, Lien, & Boulding, 2011; Vasemägi & Primmer, 2005) or have correlated outlier loci of wild populations with specific environmental variables (Bourret, Kent, et al., 2013; Bourret, Dionne, Kent, Lien, & Bernatchez, 2013; Narum, Campbell, Kozfkay, & Meyer, 2010; Perrier, Bourret, Kent, & Bernatchez et al., 2013). Of more relevance to Atlantic salmon domestication are four outlier studies comparing aquaculture strains with wild populations from the same region as their putative founder population(s) (Gutierrez, Yáñez, & Davidson, 2016; Karlsson, Moen, Lien, Glover, & Hindar, 2011; Mäkinen, Vasemägi, McGinnity, Cross, & Primmer, 2015; Vasemägi, Nilsson, & Primmer, 2005).…”

Section: Introductionmentioning

confidence: 99%

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A genome scan for selection signatures comparing farmed Atlantic salmon with two wild populations: Testing colocalization among outlier markers, candidate genes, and quantitative trait loci for production traits

Liu

Ang

Elliott

et al. 2016

Evolutionary Applications

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Comparative genome scans can be used to identify chromosome regions, but not traits, that are putatively under selection. Identification of targeted traits may be more likely in recently domesticated populations under strong artificial selection for increased production. We used a North American Atlantic salmon 6K SNP dataset to locate genome regions of an aquaculture strain (Saint John River) that were highly diverged from that of its putative wild founder population (Tobique River). First, admixed individuals with partial European ancestry were detected using STRUCTURE and removed from the dataset. Outlier loci were then identified as those showing extreme differentiation between the aquaculture population and the founder population. All Arlequin methods identified an overlapping subset of 17 outlier loci, three of which were also identified by BayeScan. Many outlier loci were near candidate genes and some were near published quantitative trait loci (QTLs) for growth, appetite, maturity, or disease resistance. Parallel comparisons using a wild, nonfounder population (Stewiacke River) yielded only one overlapping outlier locus as well as a known maturity QTL. We conclude that genome scans comparing a recently domesticated strain with its wild founder population can facilitate identification of candidate genes for traits known to have been under strong artificial selection.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A genome scan for selection signatures comparing farmed Atlantic salmon with two wild populations: Testing colocalization among outlier markers, candidate genes, and quantitative trait loci for production traits

Liu

Ang

Elliott

et al. 2016

Evolutionary Applications

View full text Add to dashboard Cite

show abstract

“…Indeed, recent studies suggest that there may have been local intraspecific adaptation to the thermal regimes experienced by adult sockeye salmon (Oncorhynchus nerka) during the spawning migration (Lee et al, 2003;Eliason et al, 2011). Similarly, the redband trout (Oncorhynchus mykiss gairdneri) appears to have uniquely adjusted its physiology to tolerate temperatures that may reach 29°C in the desert environment (Rodnick et al, 2004), a sign of thermal adaptation that has been supported by genetic evidence (Narum et al, 2010). In a more rapid and directed fashion, artificially transplanting animals to a new environment may also lead to selection by accumulating favourable heritable adaptations to create strains that are better suited to the new habitat.…”

Section: Introductionmentioning

confidence: 95%

Selection for upper thermal tolerance in rainbow trout (Oncorhynchus mykissWalbaum)

Chen

Snow

Lawrence

et al. 2015

Journal of Experimental Biology

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121

122

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Rainbow trout (Oncorhynchus mykiss Walbaum) in southern Western Australia have undergone passive selection for over 19 generations to survive high water temperatures. Based on the conceptual model of 'oxygen-and capacity-limited thermal tolerance', we measured critical thermal maximum (CT max ), maximum heart rate ( f H,max ) and aerobic scope to test the hypothesis that these rainbow trout can maintain aerobic scope at high temperatures through a robust cardiac performance supporting oxygen delivery. Across five family groups CT max averaged 29.0±0.02°C. Aerobic scope was maximized at 15.8±0.3°C (T opt ), while the upper pejus temperature (T pej , set at 90% of maximum aerobic scope) was 19.9±0.3°C. Although aerobic scope decreased at temperatures above T opt , the value at 25°C remained well over 40% of the maximum. Furthermore, pharmacologically stimulated f H,max increased with temperature, reaching a peak value between 23.5±0.4 and 24.0±0.4°C (T max ) for three family groups. The Arrhenius breakpoint temperature (T AB ) for f H,max was 20.3±0.3 to 20.7±0.4°C, while the average Q 10 breakpoint temperature (T QB , when the incremental Q 10 <1.6) for f H,max was 21.6±0.2 to 22.0±0.4°C. Collectively, f H,max progressively became less temperature dependent beyond 20°C (T AB and T QB ), which coincides with the upper T pej for aerobic scope. Although upper thermal performance indices for both aerobic scope and f H,max were compared among family groups in this population, appreciable differences were not evident. Compared with other populations of rainbow trout, the present assessment is consistent with the prediction that this strain has undergone selection and shows the ability to tolerate higher water temperatures.

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“…Stressful environments (environments outside the optimum conditions for a particular species) can impose strong ecological and evolutionary pressures at a local level [1,2]. Population persistence depends on the ability of individuals to respond to environmental stress through adaptive, plastic or behavioural mechanisms that maximise fitness [3].…”

Section: Introductionmentioning

confidence: 99%

“…Population persistence depends on the ability of individuals to respond to environmental stress through adaptive, plastic or behavioural mechanisms that maximise fitness [3]. Extremes of pH (common frog; [4]), water availability (wild mustard [5]), and temperature (redband trout; [2]) have been observed to drive adaptive population divergence. High-latitudes and altitudes experience low temperatures that can result in shorter activity periods and longer periods of freezing [3,6,7].…”

Section: Introductionmentioning

confidence: 99%

Behavioural and physiological adaptations to low-temperature environments in the common frog, Rana temporaria

2014

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BackgroundExtreme environments can impose strong ecological and evolutionary pressures at a local level. Ectotherms are particularly sensitive to low-temperature environments, which can result in a reduced activity period, slowed physiological processes and increased exposure to sub-zero temperatures. The aim of this study was to assess the behavioural and physiological responses that facilitate survival in low-temperature environments. In particular, we asked: 1) do high-altitude common frog (Rana temporaria) adults extend the time available for larval growth by breeding at lower temperatures than low-altitude individuals?; and 2) do tadpoles sampled from high-altitude sites differ physiologically from those from low-altitude sites, in terms of routine metabolic rate (RMR) and freeze tolerance? Breeding date was assessed as the first day of spawn observation and local temperature recorded for five, paired high- and low-altitude R. temporaria breeding sites in Scotland. Spawn was collected and tadpoles raised in a common laboratory environment, where RMR was measured as oxygen consumed using a closed respiratory tube system. Freeze tolerance was measured as survival following slow cooling to the point when all container water had frozen.ResultsWe found that breeding did not occur below 5°C at any site and there was no significant relationship between breeding temperature and altitude, leading to a delay in spawning of five days for every 100 m increase in altitude. The relationship between altitude and RMR varied by mountain but was lower for individuals sampled from high- than low-altitude sites within the three mountains with the highest high-altitude sites (≥900 m). In contrast, individuals sampled from low-altitudes survived freezing significantly better than those from high-altitudes, across all mountains.ConclusionsOur results suggest that adults at high-altitude do not show behavioural adaptations in terms of breeding at lower temperatures. However, tadpoles appear to have the potential to adapt physiologically to surviving at high-altitude via reduced RMR but without an increase in freeze tolerance. Therefore, survival at high-altitude may be facilitated by physiological mechanisms that permit faster growth rates, allowing completion of larval development within a shorter time period, alleviating the need for adaptations that extend the time available for larval growth.

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Adaptation of redband trout in desert and montane environments

Cited by 76 publications

References 95 publications

A genome scan for selection signatures comparing farmed Atlantic salmon with two wild populations: Testing colocalization among outlier markers, candidate genes, and quantitative trait loci for production traits

A genome scan for selection signatures comparing farmed Atlantic salmon with two wild populations: Testing colocalization among outlier markers, candidate genes, and quantitative trait loci for production traits

Selection for upper thermal tolerance in rainbow trout (Oncorhynchus mykissWalbaum)

Behavioural and physiological adaptations to low-temperature environments in the common frog, Rana temporaria

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