Summary: This Review discusses the solutions that developing larval fish have evolved to the challenges of swimming in the intermediate Reynolds number regime.
Summary: The use of passive energy recapture is widespread among medusae and its extent is regulated primarily through the pause duration between swimming cycles.
Summary: Comparison of sounds and morphology combined with current data on Balistidae phylogeny support the suggestion that all the family members should be capable of sound production using their pectoral fins.
Highlighted Article: During an epic winter journey in the Ross Sea, we discovered emperor penguins diving near Cape Washington at night; if breeding males do this too, feeding before egg laying will help them endure the subsequent 65 day incubation of the egg.
A metabolic hypothesis for the evolution of temperature effects on the arterial PCO2 and pH of vertebrate ectotherms
Summary: An additional hypothesis to protein structure–function relationships for the increase in arterial PCO2 and decline in blood pH with increases in body temperature of ectotherms.
Editors’ Choice: Cuttlefish exhibit jet-propulsed escape responses adapted to the hydrodynamic signatures generated by predators in the initial approach phase of an attack.
Highlighted Article: Clarification of the potential of visual tuning in Atlantic cod through differential opsin usage during changes in environmental light, with reference to the influence of developmental pre-programming and population ecotypes.
Effects of a physical and energetic challenge on male California mice (Peromyscus californicus): modulation by reproductive condition
Summary: In the biparental California mouse, an environmental challenge affects metabolically important physiological, morphological and behavioral measures in males, but these effects do not differ between non-reproductive males and fathers.
claudin-10 isoform expression and cation selectivity change with salinity in salt-secreting epithelia of Fundulus heteroclitus
Summary: Claudin-10 protein isoforms, which form putative cation pores, change gene expression with salinity acclimation and alter ion selectivity of the paracellular pathway in salt-secreting epithelia of euryhaline mummichogs (Fundulus heteroclitus).
Seasonal variation in the thermal responses to changing environmental temperature in the world's northernmost land bird
Summary: The Svalbard ptarmigan, much like low-latitude birds but unlike sympatric homeotherms, does not employ extensive local heterothermy for cold protection. Instead, these birds maintain prime-quality insulation – a feature shared with many other High-Arctic homeotherms.
Respiratory mechanics and morphology of Tibetan and Andean high-altitude geese with divergent life histories
Summary: Larger, but mechanically similar, respiratory systems enable the slow, deep breathing pattern of geese that reside (Andean geese) or migrate (bar-headed geese) at high altitude compared with low-altitude resident species (barnacle geese).
Summary: Drosophila brain development is sensitive to environmental stimuli; the development of the mushroom bodies and associative learning are sensitive to heat stress but not larval density and adult living conditions.
Anterior vena caval oxygen profiles in a deep-diving California sea lion: arteriovenous shunts, a central venous oxygen store and oxygenation during lung collapse
Summary: Arterialization of venous blood does not account for maintenance of aortic oxygenation during lung collapse in deep-diving sea lions.
Summary: Tropical arboreal ants routinely adhere to superheated tree branches. Adhesive performance varies interspecifically, but in many cases corresponds to the average daily surface temperature of canopy branches.
Summary: Routine flight modes seem to have shaped the energetic requirements of birds sufficiently to be anatomically detected at the comparative level.
The relationship between pectoral fin ray stiffness and swimming behavior in Labridae: insights into design, performance and ecology
Summary: Interspecific differences exist in pectoral fin ray flexural stiffness. The spatial distribution of stiffness across the fin surface enables an advantageous bending regime for propulsion in each species.
Summary: Porpoise dive heart rates are influenced by exercise and expectations, yet there is no increase in heart rate associated with prey capture sprints.
The interaction of path integration and terrestrial visual cues in navigating desert ants: what can we learn from path characteristics?
Summary: Large-scale path recordings combined with high-speed recordings at key locations suggest that path integration modulates speed along the homing path in desert ants.
Summary: Thermoregulation during torpor at low temperatures is energetically expensive and results in a considerable but disproportionate increase in heart rate and metabolism.
The effects of extended crawling on the physiology and swim performance of loggerhead and green sea turtle hatchlings
Summary: Crawling long distances as a result of disorientation during the sea turtle hatchling frenzy has little impact on physiology but the turtles rest frequently, thus significantly extending their time on the beach.