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.
Summary: Evolved changes in hemoglobin–oxygen affinity in high-altitude birds and mammals provide striking examples of convergent biochemical adaptation.
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.
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.
Summary: Intense broadband noise exposure does not affect echolocation behavior of big brown bats flying in dense acoustic clutter.
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
Highlighted Article: The locomotor biomechanics of wild, free-living echidnas is assessed using accelerometers and GPS units.
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.
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.
Highlighted Article: Ostriches moving freely overground prefer to walk very slowly and run over a broad range of speeds, with gait transitions at slower relative speeds than humans.