METHODS & TECHNIQUES
Summary: A method for performing the equivalent of an analysis of covariance on bivariate data that are curvilinear on the arithmetic scale.
Measuring metabolic rates of small terrestrial organisms by fluorescence-based closed-system respirometry
Summary: We outline calculations and assumptions to align repeated measures fluorescence closed-system respirometry with the broader respirometry literature. The resulting technology allows the calculation of metabolic rates from very small organisms, including our model system, plant seeds.
Conserved spatio-temporal patterns of suction-feeding flows across aquatic vertebrates: a comparative flow visualization study
Highlighted Article: Flow visualization reveals that suction flow speeds increase with mouth diameter, whereas other flow characteristics remain conserved across aquatic vertebrates. Therefore, trophic diversity is not supported by variation in suction flows.
Highlighted Article: Ciona larvae looming-object escape behavior and negative phototaxis are mediated by different groups of photoreceptors and involve distinct, but overlapping, visuomotor pathways, and are characterized by circular and straight swim patterns, respectively.
The effect of air resistance on the jump performance of a small parasitoid wasp, Anagyrus pseudococci (Encyrtidae)
Summary: In a small sexually dimorphic parasitoid wasp, smaller males pay a higher penalty of air resistance during take-off jumps. Nevertheless, both sexes achieve outstanding jump heights compared with their body size.
Summary: Mitochondrial performance and mitochondrial membrane composition are consistent with thermal acclimation and local adaptation effects on whole-organism thermal tolerance and aerobic metabolism in a eurythermal ectotherm.
Highlighted Article: Selenopid spiders can attack prey throughout their entire peripheral range, showing a novel hunting behavior with high maneuverability that is generated with effectively controlled reconfigurations of long, laterigrade legs.
Highlighted Article: Imidacloprid and glyphosate affect gustatory responsiveness and learning in young honey bees, which show differential sensitivity according to their age, making them successful models for studying pesticide effect on physiology and behaviour.
Fight, fatigue and flight: narrowing of attention to a threat compensates for decreased anti-predator vigilance
Summary: Male fish gradually reduce anti-predator vigilance with increased fight duration, but can maintain greater vigilance for high danger threats than for low danger threats.
High activity before breeding improves reproductive performance by enhancing mitochondrial function and biogenesis
Summary: Female mice that had access to a running wheel before mating had higher mitochondria respiration, biogenesis and reproductive outputs, indicating a positive carry-over effect to reproduction.
Anti-diuretic action of a CAPA neuropeptide against a subset of diuretic hormones in the disease vector Aedes aegypti
Summary: AedaeCAPA-1 inhibits select diuretic factors involved in Malpighian tubule fluid and ion secretion in Aedes aegypti, probably via the second messenger cGMP.
Three-dimensional analysis of the fast-start escape response of the least killifish, Heterandria formosa
Summary: The fast-start response of the least killifish entails a rich three-dimensional kinematic repertoire including complex combinations of roll, pitch and yaw motions.
Emptying and refilling of slime glands in Atlantic (Myxine glutinosa) and Pacific (Eptatretus stoutii) hagfishes
Summary: Hagfishes use slime to defend against gill-breathing predators. Exudate collected from individual slime glands shows that recovery of slime takes 3-4 weeks and its composition changes during refilling.
Highlighted Article: Differential scanning calorimetry analysis of ice fraction dynamics in two drosophilid flies indicates a tight association between proline-induced vitrification and survival of cryopreservation in Chymomyza costata larvae.
Summary: The toadfish serotonin transporter is highly conserved with that of other teleosts and is ubiquitously expressed in toadfish tissues. Systemic inhibition of the transporter produces dose-dependent elevations in plasma serotonin.
Summary: Reduced spatial resolution affects obstacle detection in ants, supporting the hypothesis that miniaturisation can affect behaviour.
Summary: The authors examine how tissue lipid composition changes during development, and how dietary lipid manipulation affects basal and peak metabolic rate, providing mixed support for the membrane pacemaker hypothesis.
The stomatogastric nervous system of the medicinal leech: its anatomy, physiology and associated aminergic neurons
Summary: Blood feeding is a signature activity of the medicinal leech. The presence and characteristics of the stomatogastric nervous system, vital for feeding, are reported here for the first time.
Environmental calcium and variation in yolk sac size influence swimming performance in larval lake sturgeon (Acipenser fulvescens)
Summary: Low environmental calcium concentration and large yolk sac volume reduce spontaneous and sprint swimming performance of fish larvae, assessed in part using a novel methodology to examine volitional swimming performance.