... 2 than others. Threespine stickleback were acclimated to 5, 12 and 20°C for 7 to 21 weeks. At each temperature, standard and maximum metabolic rate (SMR and MMR, respectively), and absolute aerobic scope (AAS) were quantified, along with mitochondrial respiration rates in liver, oxidative skeletal...

... and statistical models. The best-fit model was selected using both statistical criteria ( R 2 and AIC) and the model's prediction of three anchor points for hypoxic performance: critical P O 2 ( P crit ), maximum Ṁ O 2 and a new metric, the minimum P O 2 that supports 50% of absolute aerobic scope ( P AAS-50...

... metabolic rates in recently seawater adapted Atlantic salmon ( Salmo salar ) infected with the ectoparasitic copepod Lepeophtheirus salmonis and used an aerobic scope framework to assess the potential ecological impact of this parasite–host interaction. The early chalimus stages of L. salmonis did...

... clone- and condition-specific responses, which were equally successful in terms of fitness levels. Our results indicate the importance of the testing conditions. The important conclusions were that (i) a body size decrease at higher temperatures enabled the maintenance of a wide aerobic scope under...

... naïve. Measurements of BMR and exercise-induced MMR did not differ between the two morphs, and consequently, aerobic scope was indistinguishable between them. We propose that the behavioural differences between these two sympatric morphs are functionally complementary and represent evolutionary stable...

...Tristan J. McArley; Daniel Morgenroth; Lucas A. Zena; Andreas T. Ekström; Erik Sandblom ABSTRACT In fish, maximum O 2 consumption rate ( Ṁ O 2 ,max ) and aerobic scope can be expanded following exhaustive exercise in hyperoxia; however, the mechanisms explaining this are yet to be identified. Here...

...Andrew J. Esbaugh; Kerri L. Ackerly; Angelina M. Dichiera; Benjamin Negrete, Jr ABSTRACT The metabolic index concept combines metabolic data and known thermal sensitivities to estimate the factorial aerobic scope of animals in different habitats, which is valuable for understanding the metabolic...

... evaluated here, α values are correlated with MR, but not P crit . Rather than an index of hypoxia tolerance, P crit is a reflection of α, which evolves to support maximum energy demands and aerobic scope at the prevailing temperature and oxygen level. * Present address: Eugene Bell Center, Marine...

.... , Andreassen , A. H. , Morgan , R. , Clark , T. and Speers-Roesch , B . ( 2020 ). The aerobic scope protection hypothesis: a mechanism explaining reduced growth of ectotherms in warming environments? EcoEvoRxiv . 10.32942/osf.io/zc3bm Kafri , M. , Metzl-Raz , E. , Jona , G...

... temperature tolerance (critical thermal maximum, CT max ), as well as temperature preference ( T pref ) and avoidance ( T avoid ) of the round goby ( Neogobius melanostomus ), one of the most impactful invasive species in the world. We show that round goby maintained a high aerobic scope from 15 to 28°C...

...Jessica E. Reemeyer; Bernard B. Rees ABSTRACT Standard metabolic rate (SMR), maximum metabolic rate (MMR), absolute aerobic scope (AAS) and critical oxygen tension ( P crit ) were determined for the Gulf killifish, Fundulus grandis , an ecologically dominant estuarine fish, acclimated to lowered...

...-deficient species. Here, we quantified the thermal dependence of physiological performance in neonates of a tropical shark species (blacktip reef shark, Carcharhinus melanopterus ) from shallow, nearshore habitats. We measured minimum and maximum oxygen uptake rates ( Ṁ O 2 ), calculated aerobic scope...

... as an indicator of hypoxia tolerance, is, instead, simply a rate-specific reflection of the oxygen supply capacity. A compensatory reduction in maintenance metabolic costs in warm-adapted species constrains factorial aerobic scope and the critical P O 2 to a similar range, between ∼2 and 6, across each species...

... that standard metabolic rates (SMR) were similar among treatments; however, fish that were repeatedly exposed to 17°C had higher maximum metabolic rates (MMR) and aerobic scopes (AS) than control fish and those repeatedly exposed to 22°C. There were no differences in MMR or AS between fish exposed to 22°C...

...] and critical temperature maxima. Using these parameters, we estimated thermal performance curves of absolute aerobic scope (AAS). The populations had different thermal performance curves of AAS, and in both populations high values of AAS were maintained throughout the range of ecologically relevant...

... temperature indicating thermal limitations. Maximum metabolic rate (MMR) increased continuously with temperature, suggesting an optimum temperature for aerobic scope for exercise (AS ex ) at 6°C. Aerobic swimming performance ( U gait ) increased with acclimation temperature irrespective of CO 2 levels, while...

...Shi-Jian Fu; Jing Peng; Shaun S. Killen ABSTRACT Metabolic rates vary widely within species, but little is known about how variation in the ‘floor’ [i.e. standard metabolic rate (SMR) in ectotherms] and ‘ceiling’ [maximum metabolic rate (MMR)] for an individual's aerobic scope (AS) are linked...

... in aerobic scope (AS), which lead to decreases in energy available for essential fitness and performance functions. Consequences of warming are anticipated to be especially severe for warm-adapted tropical species as they are thought to have narrow thermal windows and limited plasticity for coping...

... metabolically costly behaviors while inhibiting food capture. Aerobic scope Capture efficiency Ciliary swimming Clearance rate Kolmogorov scale Swimming efficiency Most benthic populations depend on a supply of planktonic larvae, but nearly all larvae die during the dispersal phase (typically...

... (>28°C, ≤30°C) derived from full life cycle rearing experiments across temperatures. We tested two related predictions derived from the hypothesis that oxygen limitation sets the chronic upper thermal limits: (1) aerobic scope declines in mayfly larvae as they approach and exceed temperatures...