Table of Contents
- Current versus future reproduction and longevity: a re-evaluation of predictions and mechanisms
Summary: This paper critically reviews the effects and physiological mechanisms that reproduction could have on bioenergetic capacity to better understand how a reproductive event could affect future reproduction and/or survival.
- Hemoglobin–oxygen affinity in high-altitude vertebrates: is there evidence for an adaptive trend?
Summary: Evolved changes in hemoglobin–oxygen affinity in high-altitude birds and mammals provide striking examples of convergent biochemical adaptation.
- Amphibious fish jump better on land after acclimation to a terrestrial environment
Summary: Reversible changes to the oxidative skeletal muscle of the amphibious fish Kryptolebias marmoratus out of water enhance terrestrial locomotory performance, even in the absence of exercise training.
- Effects of elevated pCO2 and feeding on net calcification and energy budget of the Mediterranean cold-water coral Madrepora oculata
Summary: Madrepora oculata show a threshold for calcification at an Ωa of 0.92 and there is no mitigating effect at increasing pCO2 due to more food supplied.
- Feeding through your gills and turning a toxicant into a resource: how the dogfish shark scavenges ammonia from its environment
Highlighted Article: Elasmobranchs, which are nitrogen-limited in nature, take up the toxicant ammonia across their gills from environmentally realistic levels in seawater, using it to make urea, an essential osmolyte.
- Introducing a novel mechanism to control heart rate in the ancestral Pacific hagfish
Summary: A novel bicarbonate-stimulated, soluble adenylyl cyclase-mediated mechanism to control heart rate in Pacific hagfish (Eptatretus stoutii), together with catecholamine control, explains tachycardia during recovery from anoxia.
- Effects of saturation deficit on desiccation resistance and water balance in seasonal populations of the tropical drosophilid Zaprionus indianus
Summary: The tropical drosophilid Z. indianus shows seasonal plasticity for desiccation resistance and a lower rate of water loss in simulated summer versus rainy season conditions, similar to changes exhibited by seasonal wild-caught flies.
- Better late than never: effective air-borne hearing of toads delayed by late maturation of the tympanic middle ear structures
Summary: Late maturation of tympanic middle ear structures in toads causes reduced sensitivity to sounds in free-living, post-metamorphic animals.
- Echolocation behavior in big brown bats is not impaired after intense broadband noise exposures
Summary: Intense broadband noise exposure does not affect echolocation behavior of big brown bats flying in dense acoustic clutter.
- Effects of series elastic compliance on muscle force summation and the rate of force rise
Summary: Muscle stretch at activation onset, simulating a state of reduced in-series compliance, enhanced the rate of force rise and force summation. Subtle differences in muscle–tendon interaction likely explain enhanced performance.
- The private life of echidnas: using accelerometry and GPS to examine field biomechanics and assess the ecological impact of a widespread, semi-fossorial monotreme
- The oxidative debt of fasting: evidence for short- to medium-term costs of advanced fasting in adult king penguins
Summary: Fasting induces a transitory exposure to oxidative stress, and effort to recover in body mass after an advanced fasting period may be a neglected carryover cost of fasting in king penguins.
- Functional relevance of acoustic tracheal design in directional hearing in crickets
Summary: Crickets use a modified tracheal system that couples their two ears for sound localization. Yet, the most elaborate of these systems does not provide better directionality compared with more simple forms.
- Preferred gait and walk–run transition speeds in ostriches measured using GPS-IMU sensors