Summary: An analytical approach for voluntary behavior in hummingbirds suggests four broad hypotheses for the biomechanics of manuevering flight.
The bite force–gape relationship as an avenue of biomechanical adaptation to trophic niche in two salmonid fishes
Summary: The jaw muscles of two salmon species produce maximum bite force at different gape sizes, highlighting muscle physiology as an important axis of functional feeding variation.
The colour of success: does female mate choice rely on male colour change in the chameleon Furcifer pardalis?
Highlighted Article: Female panther chameleons choose mates based on specific aspects of colour change in courting males, both in the visible and the UV range.
Level-wise differences in in vivo lateral bending moment are associated with microstructural alterations in bovine caudal intervertebral discs
Summary: A dynamic analytical model of the motion and analysis of muscle cross-sections indicate that different joint levels in the bovine tail are subjected to different mechanical load magnitudes, resulting in variation in intervertebral disc microstructure.
Lung-to-ear sound transmission does not improve directional hearing in green treefrogs (Hyla cinerea)
Summary: Contrary to prevailing views on the mechanisms of hearing in frogs, the lung-to-ear pathway for sound transmission does not improve directional hearing in these vociferous vertebrates.
Gills versus kidney for ionoregulation in the obligate air-breathing Arapaima gigas, a fish with a kidney in its air-breathing organ
Summary: In this unique air-breathing fish, the kidney is more important than gills in ionoregulation, and is significant in nitrogen excretion; gill ion transport is sensitive to oxygen in both air and water.
Summary: The Hydra somersault is facilitated by differential stiffness contributed by the organization of collagen fibers in the extracellular matrix. The extracellular matrix assumes a pseudo-skeletal property important for locomotion.
Highlighted Article: Analysis of previously undocumented skimming and sliding behaviors used by remoras reveals they preferentially adhere to areas with reduced drag on blue whales.
Glucose transporter expression and regulation following a fast in the ruby-throated hummingbird, Archilochus colubris
Highlighted Article: Hummingbirds ingest nectar rich in glucose and fructose; when fasted, tissue capacity for circulating glucose import declines while remaining elevated for fructose. This may underlie maintenance of high blood glucose and rapid depletion of blood fructose.
Different microcircuit responses to comparable input from one versus both copies of an identified projection neuron
Summary: Co-stimulating both copies of an identified modulatory projection neuron at the same combined firing rate used for single copy stimulation results in different microcircuit output.
Both maternal and embryonic exposure to mild hypoxia influence embryonic development of the intertidal gastropod Littorina littorea
Summary: Maternal and embryonic exposure to mild hypoxia influence timings of developmental events, whereas aspects of embryo morphology and overall development time were influenced only by embryonic exposure to mild hypoxia.
Cost of a deprived environment – increased intraspecific aggression and susceptibility to pathogen infections
Summary: Depriving captive fish of structural enrichment increases disease susceptibility, causing elevated pathogen burden and host metabolism. Furthermore, fish from deprived environments demonstrate higher levels of aggression.
Gonads or body? Differences in gonadal and somatic photoperiodic growth response in two vole species
Summary: Development of the neuroendocrine system driving photoperiodic responses in gonadal and somatic growth differs between the common and the tundra vole, indicating that they use a different breeding strategy.
High light alongside elevated PCO2 alleviates thermal depression of photosynthesis in a hard coral (Pocillopora acuta)
Summary: Ocean chemistry, light and temperature are changing under climate change. These changes have a synergistic impact on metabolic processes involved in energy acquisition in a coral–algal symbiosis.
Heat and water loss versus shelter: a dilemma in thermoregulatory decision making for a retreat-dwelling nocturnal gecko
Summary: Duration of heating but not voluntary thermal maximum predicted water loss in a cool-climate viviparous gecko.
Summary: Morphology predicts behavior and physiological performance, which for rorquals results in both biomechanical and ecological constraints.
Summary: We used 3D-printed model eggs with checkered patterns of varying dimensions to test how chromatic visual acuity affects egg recognition in an avian brood parasite host species, the American robin.
Summary: Seals possess unique anatomical modifications that may act as accessory ‘valving’ mechanisms in their upper airway to assist in underwater feeding.
Summary: Echolocating bats perceive absolute distance to objects by measuring the time delay between call and echo. In addition, they possess spatial resolution along the distance axis.
Life stages differ in plasticity to temperature fluctuations and uniquely contribute to adult phenotype in Onthophagus taurus dung beetles
Summary: Life stages differ in thermal plasticity to increased temperature fluctuations, which may affect how some organisms fare under a warming climate.
Summary: Argentine ants plunged into darkness do not slow down while walking on flat and uneven terrain or while approaching and crossing a step obstacle.
Endurance and sprint training affect immune function differently in green anole lizards (Anolis carolinensis)
Summary: Increased allocation to different types of locomotor performance (endurance versus sprinting) results in complex trade-offs with the immune system that are not caused by energy limitation alone.
Mechanical induction of oscillatory movement in demembranated, immotile flagella of sea urchin sperm at very low ATP concentrations
Summary: Essential conditions to induce oscillatory movements of eukaryotic flagella under sub-threshold ATP concentrations were clarified.
High temperature induces transcriptomic changes in Crassostrea gigas that hinder progress of ostreid herpesvirus (OsHV-1) and promote survival
Summary: New insights into the mechanisms underlying the high survival of oysters infected with OsHV-1 at 29°C, inducing host physiological processes that are unfavorable to the viral infection.
Summary: Anoxic annual killifish embryos produce millimolar quantities of GABA. Interruptions in GABA metabolism decrease anoxia tolerance. We propose that GABA supports anoxia tolerance as a neurotransmitter and an anti-oxidant.