respirometry
- The utility and determination of Pcrit in fishes
Summary: We outline why Pcrit is a useful and informative comparator of hypoxia tolerance in fishes, provided it is determined using standardized respirometry methods and sound statistical approaches.
- Finding the peak of dynamic oxygen uptake during fatiguing exercise in fish
Summary: Accurately estimating peak oxygen uptake as a fish approaches fatigue in a swimming test must account for oxygen uptake being dynamic despite a constant, imposed workload.
- Turtles maintain mitochondrial integrity but reduce mitochondrial respiratory capacity in the heart after cold acclimation and anoxia
Summary: Inhibition of mitochondrial respiration rate and production of reactive oxygen species during cold acclimation and anoxia, while preserving mitochondrial content and morphology, is central to the anoxia tolerance of freshwater turtle hearts.
- Energetics and behavior of coral reef fishes during oscillatory swimming in a simulated wave surge
Summary: The relationship between swimming mode, turning behavior and energetic costs in coral reef fishes is examined for station-hold swimming in wave-induced water motions.
- Distinct metabolic adjustments arise from acclimation to constant hypoxia and intermittent hypoxia in estuarine killifish (Fundulus heteroclitus)
Summary: Fish acclimated to constant hypoxia induced metabolic depression, whereas fish acclimated to intermittent hypoxia maintained routine O2 demands, suggesting that distinct physiological mechanisms can be used to cope with different patterns of hypoxia exposure.
- Hyperoxia increases maximum oxygen consumption and aerobic scope of intertidal fish facing acutely high temperatures
Highlighted Article: Hyperoxia increases maximum oxygen uptake and metabolic scope in intertidal fish facing acutely high temperatures but does not increase upper thermal tolerance limits.
- High resting metabolic rates with low thermal dependence induce active dives in overwintering Pacific juvenile loggerhead turtles
Summary: Active dives of juvenile loggerhead turtles in the western North Pacific during the winter period are driven by a high resting metabolic rate.
- Avian thermoregulation in the heat: metabolism, evaporative cooling and gular flutter in two small owls
Summary: Small desert owls demonstrate heat tolerance intermediate between that of very heat-tolerant nightjars and less heat-tolerant passerines. The gular flutter mechanism contributes significantly to cooling efficiency.
- Elevated temperature and acclimation time affect metabolic performance in the heavily exploited Nile perch of Lake Victoria
Summary: Upper thermal tolerance limits and metabolic traits of a heavily exploited, tropical freshwater fish (the Nile perch) have high thermal plasticity without incurring major energetic costs.
- Asymmetry costs: effects of wing damage on hovering flight performance in the hawkmoth Manduca sexta
Summary: Asymmetric wing damage in hawkmoths is approximately twice as costly as symmetric damage.