Summary: Bird embryos detect the presence of predators while still in the egg; this environmental stressor affects early postnatal telomere length, linking prenatal conditions to future fitness.
Summary: Laboratory studies have shown that melatonin modulates migratory restlessness in passerine birds; however, nocturnal melatonin is lower in caged birds than in birds trapped while flying at night.
Summary: Retinal topography and opsin gene expression change during ontogeny of the spotted unicornfish, Naso brevirostris, with the largest changes occurring from the larval to the juvenile stage.
Stepping behaviour contributes little to balance control against continuous mediolateral trunk perturbations
Summary: When exposed to continuous, sinusoidal mediolateral trunk perturbations, subjects choose to maintain a constant step width and reduce their body centre of mass excursions to maintain stability.
Summary: Application of a novel, high-resolution biologging tag (ITAG) to veined squid in an experimental environment enables development of techniques for classifying and quantifying short-term behavioral and long-term organismal activity patterns.
In vivo force–length and activation dynamics of two distal rat hindlimb muscles in relation to gait and grade
Summary: Similar to the patterns observed in larger animals, distal rat muscles favor economy and show limited fascicle strains across gaits and grades.
Defects in mating behavior and tail morphology are the primary cause of sterility in Caenorhabditis elegans males at high temperature
Summary: Mating behaviors and tail morphology are affected by elevated temperature in male Caenorhabditis elegans. Changes in somatic tissues result in the behavioral consequences that underlie male sterility at elevated temperature.
Prolonged survival out of water is linked to a slow pace of life in a self-fertilizing amphibious fish
Summary: Intrinsically low metabolic rates increase survival and fitness of an amphibious fish when access to water is limited; there is no apparent cost when water is abundant.
Comparing context-dependent call sequences employing machine learning methods: an indication of syntactic structure of greater horseshoe bats
Summary: Syntactic structures were found different in call sequences in aggressive and distress contexts of greater horseshoe bats with three machine learning models.
Quantifying koala locomotion strategies: implications for the evolution of arborealism in marsupials
Highlighted Article: Koalas possess a unique morphology for a marsupial; examination of their locomotion is used to determine the extent to which they have converged with other arboreal mammals such as primates.
Summary: The extraordinary difference in lifespan between honey bee castes may be partially explained by oxidative damage as a result of the diet-induced increase in membrane polyunsaturated fatty acids in workers.
An impressive capacity for cold tolerance plasticity protects against ionoregulatory collapse in the disease vector Aedes aegypti
Summary: Aedes aegypti, a dangerous vector of disease, is capable of cold acclimation at least partly through mitigation of a cold-induced loss of ion balance.
Highlighted Article: A rare orb spider reels trapped prey in towards itself; its approach strategy shows that it can discriminate between heavy and light prey.
Pectoral and pelvic girdle rotations during walking and swimming in a semi-aquatic turtle: testing functional role and constraint
Summary: During locomotion, the turtle pectoral girdle rotates more than the pelvis. While pelvic girdle rotations are larger on land, the pectoral girdle rotates similarly during swimming and walking.
Summary: Five species of shrimps representing independent invasions of the anchialine ecosystem show wide variation in response to fluctuating salinity at the whole-animal, tissue and molecular level. Environmental adaptations to anchialine habitats may be divergent across both distantly and closely related taxa.
Glucagon regulation of carbohydrate metabolism in rainbow trout: in vivo glucose fluxes and gene expression
Summary: Glucagon causes hyperglycaemia in rainbow trout by increasing hepatic glucose production via activation of gluconeogenesis, and by decreasing glucose disposal via inhibition of glycogen synthesis and glycolysis.
Highlighted Article: Variable reliance on enzymatic pathways to ameliorate toxic levels of ammonia found within the intestinal lumen of fish during digestion is possibly due to the inconstant contribution of bacterial inhabitants.
Fat content of striped mice decreases during the breeding season but not during the food-restricted dry season
Summary: Striped mice do not accumulate large fat stores before the dry season but mobilize existing stores at the onset of breeding. Variation in fat stores is not associated with disappearance risk.