Summary: This paper reviews the biological role of iron, copper, zinc and manganese, and the mechanisms underlying their regulation in fish. Knowledge gaps for future research are also discussed.
Born without night: the consequence of the no-night environment on reproductive performance in diurnal zebra finches
Summary: Loss of night negatively affects reproductive performance of adult zebra finches born and raised in normal day–night, with a more severe effect at the adult stage in animals that were born and raised in a constant light environment.
Highlighted Article: Dwarf gourami water shooting behaviour was examined in a series of experiments to test the function and constraints of their shooting ability and is shown to be analogous to archerfish shooting.
Plantar flexor muscles of kangaroo rats (Dipodomys deserti) shorten at a velocity to produce optimal power during jumping
Summary: Decoupling of muscle and joint kinematics in kangaroo rat lateral gastrocnemius muscles allows for a longer period of shortening near optimal velocities, which enables the muscle to sustain maximal power generation during jumping.
Sex differences in behavioural and anatomical estimates of visual acuity in the green swordtail, Xiphophorus helleri
Summary: Anatomical and behavioural quantification of visual acuity (spatial resolving power) in green swordtails indicates that acuity was anatomically identical in both sexes, but behaviourally higher in females, with implications for signalling.
Summary: In wild-caught threespine sticklebacks, the circadian clock controls locomotor activity in only a few individuals. Sticklebacks are mostly nocturnal, although interindividual variation exists.
Evidence of cognitive specialization in an insect: proficiency is maintained across elemental and higher-order visual learning but not between sensory modalities in honey bees
Highlighted Article: Bees show cognitive specialization, with some individuals being consistently better learners than the others within a sensory modality but across task complexity.
Naive poison frog tadpoles use bi-modal cues to avoid insect predators but not heterospecific predatory tadpoles
Summary: Poison frog tadpoles innately recognize dragonfly larvae as dangerous using a combination of visual and olfactory cues.
Highlighted Article: Tuning muscle and spring properties enhanced elastic energy storage in the plantaris longus muscle of Cuban tree frogs.
Thermal–metabolic phenotypes of the lizard Podarcis muralis differ across elevation, but converge in high-elevation hypoxia
Summary: The integrative phenotypes of lizards, including metabolic and thermally dependent physiological traits, vary between populations at different elevations, but converge in the novel oxygen environment of extreme high elevation.
Seasonal cellular stress phenomena and phenotypic plasticity in land snail Helix lucorum populations from different altitudes
Summary: Cellular stress phenomena in reciprocally transplanted land snail Helix lucorum at 0 and 1250 m altitudes underline phenotypic plasticity as a response to seasonal environmental changes in corresponding habitats.
A comparison of two methods for estimating critical swimming speed (Ucrit) in larval fathead minnows: the laminar flow assay and the spinning task assay
Summary: The spinning task assay is not a viable replacement for the laminar flow assay for the evaluation of swim performance in fish.
Thermal performance curves for aerobic scope in a tropical fish (Lates calcarifer): flexible in amplitude but not breadth
Editor's Choice: Acclimation to a large daily temperature cycle does not lead to a broadening of the aerobic metabolic window in fish, suggesting that thermal performance curves for aerobic scope are more plastic in amplitude than in breadth.
Summary: Different species in the genus Oryzias exhibit a great diversity in their lateral line pattern that is not explained by their evolutionary relationships.