Cover: Death is guaranteed in reproductive octopuses; females stay den-bound and abstain from feeding as they tend to their eggs. Before the brood hatches, the mother dies. These normal maternal behaviors, including death, are controlled by secretions from the optic glands, the octopus analog of the vertebrate pituitary gland. Wang and Ragsdale (jeb185751) implicate multiple signaling systems in the functions of the female optic gland, including steroids, catecholamines and peptides. The control of brooding, feeding, senescence and death in the octopus arises not from a single ‘self-destruct’ hormone but rather from the dynamic coordination of signaling molecules. Photo credit: Z. Yan Wang.
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The engineering of the giant dragonflies of the Permian: revised body mass, power, air supply, thermoregulation and the role of air density
Summary: The giant dragonflies of the Permian would have rapidly overheated during flight. It is proposed that thermal equilibrium could have been maintained through aspects of physiology, behaviour and higher air density.
Invertebrate serotonin receptors: a molecular perspective on classification and pharmacology
Summary: Many 5-HT receptors have been characterized at the molecular level in diverse invertebrate species. This review considers how to classify and name these heterologously expressed receptors and compares their pharmacological properties.
Blood pressure in the Greenland shark as estimated from ventral aortic elasticity
Summary: Greenland shark arterial blood pressure is predicted to be very low (2.3–2.8kPa), based on the elasticity of its ventral aorta, supporting the idea that this species has a low aerobic metabolism.
Individual differences in heart rate reveal a broad range of autonomic phenotypes in a free-living seabird population
Summary: Streaked shearwaters show consistent individual differences in autonomic activity that persist even across years and are driven by individual differences in parasympathetic ‘rest-and-digest’ activity, not sympathetic ‘fight-or-flight’ activity.
Foot-propelled swimming kinematics and turning strategies in common loons
Summary: As expert foot-based swimmers, loons paddle by combining ankle flexion and knee rotation. Loons display head-bobbing, likely enhancing vision, and induce turns using their wings, tail, body and feet.
Corticosterone implants produce stress-hyporesponsive birds
Summary: Corticosterone implants decrease the adrenocortical response to stress in birds and baseline corticosterone levels in white storks.
Ocean acidification does not limit squid metabolism via blood oxygen supply
Summary: Based on experimental and theoretical evidence, it seems unlikely that ocean acidification will impair blood oxygen supply in active squid.
Accumulation and excretion of manganese ion in the kidney of Mytilus galloprovincialis
Summary: Mytilus galloprovincialis is able to concentrate 15 times more manganese ion in the kidney compared with concentrations in ambient seawater, and has been shown to excrete urine voluntarily.
Angling-induced injuries have a negative impact on suction feeding performance and hydrodynamics in marine shiner perch, Cymatogaster aggregata
Summary: Injuries to the mouth caused by fishing hooks reduce suction feeding performance in marine surfperch by altering the flow of water into the mouth during suction.
Multiple optic gland signaling pathways implicated in octopus maternal behaviors and death
Editors' Choice: Octopus optic glands employ a multiplex progression of signaling molecules to regulate maternal behaviors.
Wing inertia as a cause of aerodynamically uneconomical flight with high angles of attack in hovering insects
Summary: Examination of the impact of wing inertia on the power requirement and flapping angle of attack, based on 3D free-hovering flight wing kinematics of a beetle Allomyrina dichotoma, using a theoretical blade element model.
Do squid breathe through their skin?
Summary: Contrary to a 30-year-old well-regarded hypothesis, squid do not obtain oxygen across their skin to supply underlying tissues.
Nosemosis control in European honey bees, Apis mellifera, by silencing the gene encoding Nosema ceranae polar tube protein 3
Summary: Use of RNAi-based therapeutics for nosemosis disease in honey bees.
Channeling vorticity: modeling the filter-feeding mechanism in silver carp using μCT and 3D PIV
Summary: The greatly modified filtering plates of silver carp produce strong, directed vortical flow during filter feeding, which is thought to potentially increase feeding efficiency.
How the egg rolls: a morphological analysis of avian egg shape in the context of displacement dynamics
Summary: Demonstration of a relationship between the shape of calcareous eggshells and their physical displacement by rolling to illuminate the adaptive value of morphology in the context of nesting habitat.
Heterogeneity of neuromasts in a fish without lateral line canals: the pufferfish (Takifugu obscurus) model
Summary: Three types of neuromast (tall, medium and short, belonging to two functional groups) have been identified on the lateral line system of pufferfish (Takifugu obscurus) and encode different aspects of the hydrodynamic stimulus.
The low-down on sleeping down low: pigeons shift to lighter forms of sleep when sleeping near the ground
Highlighted Article: Birds decrease REM sleep in a similar manner to mammals when sleeping under conditions of higher perceived predation risk.
Oxidative cost of interspecific hybridization: a case study of two Triturus species and their hybrids
Summary: Hybrid individuals of crested newts had higher values of anti-oxidant parameters and a less integrated anti-oxidant defence system in comparison with parental species, indicating a higher investment in maintaining oxidative balance.
Aerodynamic characteristics along the wing span of a dragonfly Pantala flavescens
Summary: Interwing aerodynamic interactions vary across the span of the high aspect ratio wings of dragonflies. This spanwise variation in aerodynamics could be exploited in the design of micro-air vehicles.
Evidence for spatial vision in Chiton tuberculatus, a chiton with eyespots
Summary: Certain chitons have hundreds to thousands of eyespots (∼35 µm) distributed across their shell plates; these eyespots are associated with spatial vision.
Anti-diuretic activity of a CAPA neuropeptide can compromise Drosophila chill tolerance
Summary: Many insects lose ion balance in the cold. CAPA neuropeptide can slow ion transport and reduce the cold tolerance of a fly.
How does the environment affect fighting? The interaction between extrinsic fighting ability and resource value during contests
Highlighted Article: Environmental variation can affect an individual's willingness and capacity to engage in fights over indivisible resources.
Thermal physiological traits and plasticity of metabolism are sensitive to biogeographic breaks in a rock-pool marine shrimp
Summary: Thermal performance, but not the metabolic rate, of a widely distributed species varies linearly with latitude, whereas thermal limits and plasticity of metabolism are affected by biogeographic breaks.
New funding schemes for junior faculty staff
In celebration of our 100th anniversary, JEB has launched two new grants to support junior faculty staff working in animal comparative physiology and biomechanics who are within five years of setting up their first lab/research group. Check out our ECR Visiting Fellowships and Research Partnership Kickstart Travel Grants. First deadline for applications is 15 July 2023.
JEB@100: an interview with Monitoring Editor Sanjay Sane
Sanjay Sane tells us about his first experience of publishing with the journal and why he thinks JEB is going to play a key role in our understanding of the current climate crisis and its implications for biodiversity.
The Forest of Biologists
The Forest of Biologists is a biodiversity initiative created by The Company of Biologists, with support from the Woodland Trust. For every Research and Review article published in Journal of Experimental Biology a native tree is planted in a UK forest. In addition to this we are protecting and restoring ancient woodland and are dedicating these trees to our peer reviewers. Visit our virtual forest to learn more.
Celebrating 100 years of discovery
This Special Issue focuses on broad biological questions addressed through the lens of comparative biomechanics. Crosscutting through time, this series of Reviews, Commentaries and Research Articles addresses questions from the vantage points of the history of the field, today’s research, and the future of comparative biomechanics. Read the Editorial by Sheila Patek, Monica Daley and Sanjay Sane.
Centenary Review - Adaptive echolocation behavior
Cynthia F. Moss and colleagues Review the behaviours used by echolocating mammals to track and intercept moving prey, interrogate dynamic sonar scenes, and exploit visual and passive acoustic stimuli.
Lack of oxygen curtails vision in red-eared sliders
When red-eared sliders sink to the bottom of a frozen pond for winter they reduce many biological systems to minimum life support, but now Michael Ariel and colleagues show that the reptiles temporarily lose their sight due to lack of oxygen but retain hearing.