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.
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.
Highlighted Article: Backward-homing Cataglyphis fortis ants exhibit angular and distance gauging comparable to that of forward-homing ants.
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.
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.
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.
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.
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.