The stalk-eyed fly as a model for aggression – is there a conserved role for 5-HT between vertebrates and invertebrates?
Summary: We propose that the role of 5-HT in modulating invertebrate aggression is more nuanced than previously appreciated; there is evidence for distinct roles of 5-HT receptor subtypes in stalk-eyed flies, similar to the situation in vertebrates.
Highlighted Article: Analyses of 14 fish and cetaceans during breaches indicates that the universal upper boundary of power production is ∼200 W kg−1 muscle, which matches maximum power recorded by animals under any other circumstances.
Summary: Muscles lose torque potential when activated with their agonistic group and this deficit is not associated with smaller moment arms, changes in inter-muscular pressure or inter-muscular force transfer.
Summary: Female mice carrying a selfish genetic element have a longer lifespan; these females have lower metabolic rates as they increase in size, which may arise through gene expression differences in the liver.
A new method for mapping spatial resolution in compound eyes suggests two visual streaks in fiddler crabs
Summary: A new method for estimating the spatial and optical resolution of compound eyes, using the 3D micro-CT images of preserved animals.
Summary: Muscle response to rapid, identical strain perturbations is history dependent, but is captured by a viscoelastic model with memory; the data and model show that the muscle perturbation response depends on locomotor frequency.
Maternal glucocorticoids promote offspring growth without inducing oxidative stress or shortening telomeres in wild red squirrels
Summary: Experimental increases in glucocorticoids in breeding female North American red squirrels affects offspring postnatal growth but not levels of oxidative damage and antioxidants or telomere lengths.
Summary: Visual input appears not to be necessary to develop well-focused eyes in diverse arthropods, including camera-type eyes of beetle larvae and spiders, and compound eyes in flies.
Summary: Experience acquired during adulthood changes the morphology, physiology and behavioral output of the olfactory system in the honey bee.
Summary: Measurements of the costs of tonal sound production in bottlenose dolphins indicate that whistle communication is very cheap.
Comparing perineuronal nets and parvalbumin development between blackbird species with differences in early developmental song exposure
Summary: Perineuronal net and parvalbumin comparisons in blackbird species with contrast in early exposure to song tutors reveals a similar pattern in song learning nuclei but not in a song production nucleus.
Highlighted Article: Male flower beetles have large hind legs that they use to grasp females securely during mating, acting like a vice grip; these legs do not enhance performance during take-off relative to females.
A fitness cost resulting from Hamiltonella defensa infection is associated with altered probing and feeding behaviour in Rhopalosiphum padi
Summary: Reduced performance of aphids infected with a common facultative endosymbiont on poor quality plants may be explained by changes in aphid probing behaviour and decreased phloem sap ingestion.
Tissue-specific expression of 11β-HSD and its effects on plasma corticosterone during the stress response
Summary: Peripheral enzymes are primarily responsible for enzymatic modulation of the glucocorticoid stress response in songbirds.