Impact of intraspecific variation in teleost fishes: aggression, dominance status and stress physiology
Summary: In this Review, we discuss the development of dominance hierarchies, how social rank is signalled through visual and chemical cues and the neurobiological mechanisms controlling or correlating with agonistic behaviour.
Absence of atrial smooth muscle in the heart of the loggerhead sea turtle (Caretta caretta): a re-evaluation of its role in diving physiology
Summary: Unlike emydid turtles, the loggerhead sea turtle heart does not have atrial smooth muscle. However, like other turtles, loggerheads exhibit smooth muscle in the sinus venosus, which likely regulates cardiac filling.
METHODS & TECHNIQUES
Summary: We show how to construct and apply a setup to acoustically tether and enable behavioral observations of individual microorganisms using simple laboratory equipment and a standard light microscope.
Underwater hearing in sea ducks with applications for reducing gillnet bycatch through acoustic deterrence
Highlighted Article: Investigation of underwater hearing ability in multiple sea duck species using psychoacoustic and electrophysiological techniques, with potential for development of effective pinger devices applicable to conversation strategies to reduce sea duck bycatch.
Seasonal variation in rest–activity patterns in barnacle geese: are measurements of activity a good indicator of sleep–wake patterns?
Highlighted Article: Accelerometry-based activity measurements can serve as a good proxy for sleep–wake patterns in barnacle geese.
c-fos expression in the olfactory epithelium of the East African cichlid (Haplochromis chilotes) in response to odorant exposure
Summary:In situ hybridization with c-fos riboprobe indicates differential responses of olfactory sensory neurons to odorants in East African cichlids, providing insight into how olfaction has contributed to the diversification of cichlids.
Summary: Plasticity of the energetic costs of growth and scaling relationships in larval zebrafish revealed a complex and dynamic allostatic response to multiple environmental stressors in early fish stages.
Ontogeny of risk assessment and escape-hatching performance by red-eyed treefrog embryos in two threat contexts
Summary: Development reduces risk assessment and improves hatching performance by red-eyed treefrog embryos in both flooding and simulated attacks. Predation cues elicit faster decisions and hatching, congruent with more immediate risk.
Subsets of leg proprioceptors influence leg kinematics but not interleg coordination in Drosophila melanogaster walking
Summary: Transient optical inhibition of leg proprioceptors demonstrates their importance for leg kinematics and motor control during free walking in Drosophila melanogaster.
The flavonoid kaempferol protects the fruit fly Drosophila melanogaster against the motor impairment produced by exposure to the insecticide fipronil
Summary: Prophylactic administration of the flavonoid kaempferol induces protection against the motor impairment produced by exposure of fruit flies to the insecticide fipronil.
Summary: Comparison of biomechanical properties of temporal osteoderms in 11 lizard species reveals significant differences in stiffness between taxa, reflecting differences in microstructure and macrostructure and, likely, in function.
Characterization of two novel ammonia transporters, Hiat1a and Hiat1b, in the teleost model system Danio rerio
Editor's choice: Functional characterization of two novel ammonia transporters (Hiat1a/b) in fish: Hiat1 is critical for development and likely involved general ammonia handling.
Summary: Arboreal salamanders frequently demonstrate steep but stable glides, effective parachuting and controlled aerial maneuvers that may be useful when falling through the tree canopy.