Physiological insight into the evolution of complex phenotypes: aerobic performance and the O2 transport pathway of vertebrates
Summary: Studies of the evolution of aerobic capacity and the O2 transport pathway can provide appreciable insight into the systems-level mechanisms underlying the evolution of complex performance traits.
Summary: Contraction of the python heart is initiated by pacemaker cells in the region between the left leaflet of sinoatrial valve and the posterior horn of the sinus venosus.
Summary: Pollen foragers were prone to recruiting bees with a tendency to collect pollen, whereas nectar foragers more frequently recruited bees that preferred sucrose solutions.
Social stimuli increase activity of adult-born cells in the telencephalon of zebrafish (Danio rerio)
Summary: Adult-born cells in the zebrafish brain respond to brief visual stimuli, indicating that they have the ability to contribute to the regulation of social behavior.
Interactions between developmental and adult acclimation have distinct consequences for heat tolerance and heat stress recovery
Summary: The interaction between developmental and adult acclimation promotes heat survival in Drosophila melanogaster under specific conditions. Further, heat tolerance and heat stress recovery appear partly decoupled processes.
Early suppression of the endocannabinoid degrading enzymes FAAH and MAGL alters locomotor development in zebrafish
Summary: Perturbation of the endocannabinoid system in the first 24 h of development alters motor neuron development and locomotion in zebrafish.
The alternative oxidase (AOX) increases sulphide tolerance in the highly invasive marine invertebrate Ciona intestinalis
Editor's Choice: A functional study on the role of the mitochondrial alternative oxidase (AOX) in an animal species indicates that AOX increases the sulphide tolerance of the marine chordate Ciona intestinalis.
Summary: Before becoming foragers, Melophorus bagoti ants took 3–7 learning walks around their nest. They increased the duration and area explored over successive walks, stopping occasionally to scan the environment.
Summary: Analysis of the siphon withdrawal reflex in Aplysia provides evidence for the hypothesis that sleep preferentially benefits learning that is more complex than conditioning of a simple reflex.
Correlated decision making across multiple phases of olfactory-guided search in Drosophila improves search efficiency
Summary: Fruit flies spend more time searching for food near attractive odors when the time since their last visit to a similar odor source is longer, which increases efficiency, as does stochasticity in the decision-making process.
The influence of in vivo mechanical behaviour of the Achilles tendon on the mechanics, energetics and apparent efficiency of bouncing gaits
Summary: The mechanical behaviour of the Achilles tendon explains apparent efficiency (the proportion of metabolic power that goes into useful mechanical power at the whole-body level) behaviour in bouncing gaits.
Summary: Flower shape preference tests show wild bees prefer the shape of Australian insect-pollinated flowers over bird-pollinated flowers, providing a valuable framework for further behavioural testing of non-eusocial bees.
Regional femoral bone blood flow rates in laying and non-laying chickens estimated with fluorescent microspheres
Summary: Femoral bone blood flow, measured using fluorescent microspheres, is approximately two times higher in laying hens than in non-laying hens and roosters. Blood flow values were related to foramen sizes.
The captivating effect of electric organ discharges: species, sex and orientation are embedded in every single received image
Summary: Electric images generated by species- and sex-specific electric organ discharges also encode information regarding relative position, which allows an individual fish to find a mate among sympatric species in muddy waters.
Directional biosonar beams allow echolocating harbour porpoises to actively discriminate and intercept closely spaced targets
Highlighted Article: Echolocating porpoises can resolve targets from distractors when echoes arrive well below their auditory integration time, suggesting a short clutter interference zone where discrimination is aided by a directional biosonar.
Molecular and physiological responses predict acclimation limits in juvenile brook trout (Salvelinus fontinalis)
Summary: Brook trout have a reduced ability to acclimate to temperatures ≥20°C, evidenced by changes in mRNA abundance, standard metabolic rate and recovery from exercise stress, with implications for survival under predicted climate change scenarios.
Summary: Ants with only right-eye vision can learn routes guided by a visual cue to the left: they turn leftwards, see the cue, then rightwards by the appropriate memorised angle.
Highlighted Article: Humans have dramatically reduced their ‘pelvic step’ – the ability of pelvic rotation to increase stride length – throughout hominin evolution.