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Summary: Magnetic orientation responses in animals are often weak and difficult to elicit experimentally. A possible explanation is that the magnetic compass is ‘noisy’ and cannot acquire precise magnetic information over short time periods.


Summary: The first experimental evidence of absolute worker sterility in a social insect species. Australian stingless bee workers under a manipulated social environment and diet are irreversibly sterile.

Highlighted Article: Annual killifish embryos survive over a year without water. Dormant and actively developing embryos exhibit opposite metabolic responses to dehydration. These responses may contribute to phenotypic variation associated with developmental bet hedging.

Highlighted Article: Nectar-feeding bats have very high daily energy demands. The bat Leptonycteris yerbabuenae discriminates very small sugar concentration differences, which helps it to avoid physiological constraints.

Highlighted Article: Long dives in Cuvier's beaked whales are not followed by prolonged recovery periods, suggesting that diving metabolism is reduced and/or undescribed mechanisms are used to process products of anaerobic metabolism.


Summary: A new method for plotting joint poses, inspired by a 16th century map projection, allows coordinate-system-independent measurements of joint mobility and enables accurate comparative studies of joint function.


Summary: A two-stage brood size manipulation experiment in Cyanistes caeruleus, with application of small-angle X-ray scattering and electron microscopy, revealed that structurally coloured feathers are more sensitive to conditions during feather growth than during the first days after hatching.

Summary: Several morphological modifications are likely to contribute to the stiffness of the novel walking appendages in the sea-robin and therefore their ability to facilitate underwater locomotion.

Summary: Males of the strepsipteran Stylops ovinae develop significantly higher forces on smooth than hairy surfaces; these forces are generated by adhesion and not by mechanical interlocking with host hairs.

Summary: A mutation in the serotonin neurotransmitter pathway that lowers basal stress levels but increases the amplitude of stress response can spread in cavefish populations living in singular environments.

Summary: Presentation and evaluation of 13C-labelled sodium bicarbonate (NaBi) combined with particle image velocimetry (PIV) for estimation of flight energetics in birds over a wide range of speeds.

Highlighted Article: The cytosolic malate dehydrogenase enzyme of the honeybee has three allozymes that show parallel temperature clines on four continents, reflecting the adaptive advantage/disadvantage of each allele at different temperatures.

Summary: Fluidic modelling and theoretical analysis of the honey bee feeding mechanism reveals an adaptation strategy in which bees respond to variation in nectar properties by regulating dipping frequency.

Summary: The energetic cost of epithelial ion transport in larval zebrafish is estimated to be low based on relatively constant in vivo O2 flux across cutaneous ionocytes, despite widely varying rates of Na+ uptake.

Summary:Drosophila strains differ in their response to exercise stimulation, which is controlled at least in part by genetic variation and sex.

Summary:Bactrocera dorsalis can learn to discriminate three sugars – sucrose, fructose and glucose – through both pre- and post-ingestive signals, which might be a strategy for flies to assess the quality of the food.

Summary: A species contrast in patterns of noradrenaline levels reveals that different brain areas are responsible for the encoding of social signals versus preferences for those signals.

Summary: Incorporating appropriate fiber properties and muscle architecture is necessary to evaluate the contribution of individual muscles to combined plantarflexor force-velocity properties.

Editor's choice: Channel catfish use their dorsal body muscles to stabilize the head during suction feeding, while the ventral body muscles power mouth expansion.

Summary: Cortisol increases during exposure to seawater and exogenous cortisol upregulates gill NKA, NKCC and H+-ATPase and plasma glucose in sturgeon; thus, cortisol is a key osmoregulatory and glucocorticoid hormone in chondrosteans.

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