Table of Contents
- Novel and potential physiological roles of vacuolar-type H+-ATPase in marine organisms
Summary: Recently discovered physiological roles of the vacuolar-type H+-ATPase include base secretion in shark gills, bone dissolution by Osedax worms and a carbon-concentrating mechanism in corals.
- The thermal dependence of Na+ flux in isolated liver cells from ectotherms and endotherms
Summary: Na+ flux rate across liver cell membranes is compared between mammals (endotherms) and a series of ectotherms with different normal operating body temperatures.
METHODS & TECHNIQUES
- Tracking the kinematics of caudal-oscillatory swimming: a comparison of two on-animal sensing methods
Summary: Two different on-animal sensors that can track biomechanical swimming parameters including changes in gait during cetacean diving, enabling studies of swimming energetics in wild animals.
- How to find home backwards? Locomotion and inter-leg coordination during rearward walking of Cataglyphis fortis desert ants
Highlighted Article: Examination of backward walking Cataglyphis fortis ants reveals remarkable flexibility of inter-leg coordination.
- How to find home backwards? Navigation during rearward homing of Cataglyphis fortis desert ants
Highlighted Article: Backward-homing Cataglyphis fortis ants exhibit angular and distance gauging comparable to that of forward-homing ants.
- Take-off speed in jumping mantises depends on body size and a power-limited mechanism
Summary: Praying mantises, which use direct muscle contractions to generate jumps, have take-off velocities limited by the amount of power (energy/time) the muscles can produce.
- Avian thermoregulation in the heat: evaporative cooling capacity in an archetypal desert specialist, Burchell's sandgrouse (Pterocles burchelli)
Summary: Evaporative cooling in Burchell's sandgrouse, an archetypal arid-adapted bird, is surprisingly inefficient, and suggestive of heavy reliance on respiratory rather than cutaneous heat dissipation.
- Avian thermoregulation in the heat: efficient evaporative cooling allows for extreme heat tolerance in four southern hemisphere columbids
Summary: Arid-zone pigeons and doves dissipate heat primarily through cutaneous evaporative pathways, which has minimal metabolic costs, is highly efficient and allows for the defense of a relatively low body temperature under extreme heat conditions.
- The behavioral regulation of thirst, water collection and water storage in honey bee colonies
Highlighted Article: When a honey bee colony experiences broodnest hyperthermia, its water collectors quickly spring into action after being begged for fluid.
- Basking hamsters reduce resting metabolism, body temperature and energy costs during rewarming from torpor
Summary: Basking substantially modifies thermal energetics in winter-acclimated hamsters, reducing resting body temperature, metabolic rate and rewarming costs. This suggests that this behaviour is of energetic significance not only for desert but also for cold-climate mammals.
- Specialized primary feathers produce tonal sounds during flight in rock pigeons (Columba livia)
Summary: The outermost primary feathers (P10) in male and female rock pigeons (Columba livia) are specialized to produce tonal sounds during high-speed take-off at the expense of aerodynamic performance.
- Refuging rainbow trout selectively exploit flows behind tandem cylinders
Highlighted Article: Closely spaced structures submerged within a current produce organized flows that encourage refuging in fish.
- Counting calories in cormorants: dynamic body acceleration predicts daily energy expenditure measured in pelagic cormorants
Summary: A doubly labelled water method validates the use of dynamic body acceleration in estimating energy expenditure of a foot-propelled diving homeotherm capable of flight in the wild.
- Inhibition of the oxidative stress response by heat stress in Caenorhabditis elegans
Summary: In Caenorhabditis elegans exposed to heat stress in combination with oxidative stress, the heat-shock response is prioritized over the oxidative-stress response, leading to a synergistic decrease in survival.
- Brood size constrains the development of endothermy in blue tits
Highlighted Article: The development of endothermic heat production in individual blue tit nestlings differs between broods of different sizes.
- In situ cardiac perfusion reveals interspecific variation of intraventricular flow separation in reptiles
Summary: Non-crocodilian reptiles have an undivided ventricle, but some (pythons, varanid lizards) robustly separate blood flow, whereas others (turtles, anacondas, bearded dragons) show a large capacity for cardiac shunting.