2013
DOI: 10.1139/cjz-2012-0300
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Optimum and maximum temperatures of sockeye salmon (Oncorhynchus nerka) populations hatched at different temperatures

Abstract: Temperature tolerance and heart rates were compared among nine sockeye salmon (Oncorhynchus nerka (Walbaum in Artedi, 1792)) populations, whose eggs were incubated at 10, 14, and 16°C before rearing all hatchlings at a common temperature. Critical thermal maximum (CTmax) significantly differed among populations and temperature treatments. Populations with shorter migration distance and a lower migration and spawning temperature tended to have higher CTmax at 90 days posthatch. However, the relationship was rev… Show more

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Cited by 72 publications
(70 citation statements)
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“…While the correspondence between thermal tolerance and environmental conditions suggests local adaptation brought about by selection on additive genetic effects, our study suggests that an indirect genetic effect-mediated by egg size-could instead underlie the variation. Indeed, across many sockeye salmon populations, egg size is populationspecific and positively correlated with natural incubation temperatures [37] and juvenile thermal tolerance [36]. Heart rate varies considerably both within and between fish species, with resting f H being primarily determined by metabolic rate and haemodynamic requirements, and f Hmax being limited by mechanistic constraints such as pacemaker potential, excitation-contraction properties and myocardium structure [38].…”
Section: Discussionmentioning
confidence: 99%
“…While the correspondence between thermal tolerance and environmental conditions suggests local adaptation brought about by selection on additive genetic effects, our study suggests that an indirect genetic effect-mediated by egg size-could instead underlie the variation. Indeed, across many sockeye salmon populations, egg size is populationspecific and positively correlated with natural incubation temperatures [37] and juvenile thermal tolerance [36]. Heart rate varies considerably both within and between fish species, with resting f H being primarily determined by metabolic rate and haemodynamic requirements, and f Hmax being limited by mechanistic constraints such as pacemaker potential, excitation-contraction properties and myocardium structure [38].…”
Section: Discussionmentioning
confidence: 99%
“…In salmonids, data suggest that the inability of f H,max to continue to increase exponentially with temperature may be the initial trigger for the levelling of aerobic scope as T opt is approached (Farrell, 2009;Casselman et al, 2012;Eliason et al, 2013). Here, as in earlier studies (Casselman et al, 2012;Chen et al, 2013;Sidhu et al, 2014), we used pharmacological approaches to generate f H,max and to examine the effect of acute warming. The proximity of T AB (Table 2) and upper T pej (Table 1) contrasts with the previous findings that T AB was closer to either T opt (Casselman et al, 2012) or lower T pej (Ferreira et al, 2014).…”
Section: Metabolic Rates and Aerobic Scopementioning
confidence: 99%
“…More specifically, the questioning was for a fish species (Norin et al, 2014), an amphibian species (Overgaard et al, 2012) and a tropical shrimp (Ern et al, 2014). Yet, aerobic scope, f H,max and CT max have been satisfactorily compared through the studies in goldfish (Ferreira et al, 2014), Danio (Sidhu et al, 2014) and salmonids (Casselman et al, 2012;Chen et al, 2013). Therefore, the present study determined the optimum temperature for aerobic scope (T opt ) and the extent to which aerobic scope diminished at supraoptimal temperatures up to 25°C.…”
Section: Introductionmentioning
confidence: 99%
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“…Both the aerobic scope (e.g. Brett, 1962;Ultsch et al, 1980;McKenzie et al, 2012;Eliason et al, 2013a;Killen et al, 2014;Del Raye and Weng, 2015) and ƒ H (Stillman, 2002;Blank et al, 2004;Braby and Somero, 2006;Franklin et al, 2007;Sidhu et al, 2014;Chen et al, 2013;Verhille et al, 2013;Anttila et al, 2014;Ferreira et al, 2014) measurements have been reinstituted to investigate the thermal niches of fishes in this era of rapid climate change. We tested the hypothesis that the cardio-respiratory system of B. saida would thermally acclimate at 0.5, 3.5 and 6.5°C.…”
Section: Introductionmentioning
confidence: 99%