Cognitive maps in the wild: revealing the use of metric information in black howler monkey route navigation
Highlighted Article: Black howler monkeys rely on route-based cognitive maps, which constrain their movement decisions, but likely incorporate metric information to navigate more efficiently along frequently used routes.
MicroRNA-mediated inhibition of AMPK coordinates tissue-specific downregulation of skeletal muscle metabolism in hypoxic naked mole-rats
Summary: MicroRNAs regulate AMPK and skeletal muscle metabolic function in hypoxic naked mole-rats.
Summary: Exogenous alanine inhibits the rate of glucose appearance and disposal in rainbow trout to lower circulating glucose concentrations. In contrast to mammals, the glucose-lowering effect does not involve activation of AMPK.
Expression of insulin-like growth factors depends on both mass and resource availability in female green anoles (Anolis carolinensis)
Summary: Manipulation of diet to influence the energetic environment in Anolis carolinensis females reveals that expression of insulin-like growth factor 1 and 2 (IGF1 and IGF2) is affected by energetic status in reptiles.
The wing scales of the mother-of-pearl butterfly, Protogoniomorpha parhassus, are thin film reflectors causing strong iridescence and polarization
Summary: The dorsal wings of the mother-of-pearl butterfly, Protogoniomorpha parhassus, show characteristics of thin film reflectors, allowing simultaneous spectral and polarization changes, which may be important in intraspecific communication.
Summary: Ants can learn to associate an odour with a reward; blocking receptors for the neurotransmitter octopamine prevents learning, and blocking dopamine receptors affects long-term memory.
Metabolic trade-offs in tropical and subtropical marine mammals: unique maintenance and locomotion costs in West Indian manatees and Hawaiian monk seals
Summary: An examination of energetics in manatees and monk seals provides insight into the metabolic trade-offs required for rest and diving by marine mammals living in warm water.
Temperature effects on the contractile performance and efficiency of oxidative muscle from a eurythermal versus a stenothermal salmonid
Summary: Additional mechanistic insights indicate why Atlantic salmon are more tolerant of high temperatures than Arctic char, and why char are particularly vulnerable to climate change.
Highlighted Article: Marine mammals show elevated energy expenditure compared with terrestrial mammals; however, bottlenose dolphins expend 17.1% less energy than other marine mammals of a similar body mass. They also show an age-related metabolic decline.
Summary: Hindlimb unloading in rats leads to disturbances in body balance and locomotor performance, and results in compensatory adjustments of muscle activity toward a faster gait strategy, presumably with a supraspinal origin.
The effects of triceps surae muscle stimulation on localized Achilles subtendon tissue displacements
Summary: Localized tissue displacements within the Achilles tendon respond in anatomically consistent ways to differential patterns of triceps surae muscle activation, but these relationships are highly susceptible to ankle angle.
Metabolic rates of aggressive and submissive phenotypes are colour blind in the polymorphic Gouldian finch
Summary: Gouldian finches have genetically distinct colour morphs linked with differences in dominance. Despite this, they did not differ in four categories of metabolic assessment before or after initial social interactions.
Comparative analysis of a geometric and an adhesive righting strategy against toppling in inclined hexapedal locomotion
Summary: Calculation of the torques about the critical tipping axis of animals beyond the quantification of the stability margin or the body height enables categorization of locomotion behaviors against toppling.
Summary: The first quantitative analysis of the separate effects of CO2 and bicarbonate on crocodilian hemoglobin, showing that both bind directly with high affinity at the same T-state site, promoting O2 unloading.
Summary: Viscous shear stress acting on the distal margin of regenerating fins and the resulting internal tension are proposed as signals for fine-tuning of ray growth dynamics and branching pattern.
Normoxic limitation of maximal oxygen consumption rate, aerobic scope and cardiac performance in exhaustively exercised rainbow trout (Oncorhynchus mykiss)
Summary: Hyperoxia expands maximal oxygen consumption rate and aerobic scope in exhaustively exercised rainbow trout by increasing cardiac contractility and cardiac output.
Acclimation to tidal conditions alters the physiological responses of the green shore crab, Carcinus maenas, to subsequent emersion
Summary:Carcinus maenas acclimated to a simulated tidal cycle verses constant submersion exhibit different physiological responses to emersion and immersion, indicating that caution must be taken when acclimating intertidal organisms to laboratory conditions.