... natalis ) to differing salinities (100%, 75%, 50% or 25% sea water) for 24 h during their spawning period and measured some key developmental and physiological traits. We found no effect of salinity on time of first heartbeat, time of hatching, first in-egg embryonic and post-hatch heart rate, or post...

... remains to be seen. Crustaceans are unusual in that they can stop their heart for extended periods. These periods of cardiac arrest can become remarkably rhythmic, accounting for a significant portion of the cardiac repertoire. As we discuss in this Review, in crustaceans, changes in heart rate have been...

... aggressive social calls. The presentation of aggressive social calls, including distress calls (DCs), is known to increase heart rate ( f H ), but how this change in f H is related to the bat's sound perception and how this evokes behaviors such as the fear response is unknown. Herein, we show...

... and secondary stress markers were determined at CT max . In dogfish, the agitation temperature was characterised by increased turning activity within experimental chambers and was equal to the temperature at which dogfish exhibited maximum heart rate. Citrate synthase activity increased at the agitation...

...Rebeccah M. Sandrelli; A. Kurt Gamperl ABSTRACT In this study, Atlantic salmon were: (i) implanted with heart rate ( f H ) data storage tags (DSTs), pharmacologically stimulated to maximum f H , and warmed at 10°C h −1 (i.e. tested using a ‘rapid screening protocol’); (ii) fitted with Doppler ®...

... cardiovascular screening (ECG and bioimpedance) in large non-human primates (chimpanzees), without the need for full anaesthesia or skin preparation. Electrocardiogram Electrical bioimpedance Heart rate Respiratory rate Chimpanzee Health care management Heart failure leading to a sudden...

... then assessed using a combination of in vivo , in vitro and biochemical approaches. Critical thermal maximum was higher in TD brook char despite significant reductions in maximum heart rate. In vivo , TD brook char exhibited a lower resting heart rate, blunted hypoxic bradycardia and a severe reduction in time...

... that the hemolymph returns to the VR. The hinge ligament duct allows a constant return flow from the foot chamber to the gills and the heart. The heart rate and the flow in the FZ, which decreased and increased during the foot extension and retraction, respectively, supported this model. In conclusion, the FZ...

... of cardiac thermal performance and ‘preparative defence’ strategies of Batillaria attramentaria snails may allow the dark shell morph to adapt to rapid and stronger thermal stress. Shell colour polymorphism Heart rate Heat shock proteins Moderate thermal stress Thermal adaptations...

... acclimated wild, migratory Arctic char to 13°C (∼7°C above a summer average) for an ecologically relevant period (3 days) and measured maximum heart rate (ƒ H,max ) during acute warming to determine their ability to rapidly improve cardiac function at high temperatures. Arctic char exhibited rapid...

.... Exercising crabs exhibited transient scaphognathite slowing and progressive increases in heart rate, whereas emersed crabs exhibited persistent inhibition of ventilation and transient heart slowing. Upon return to seawater, all these rates increased above both control and treatment levels. Post-exercise...

...Ayaka Saito; Chihiro Kinoshita; Megumi Kawai; Takuya Fukuoka; Katsufumi Sato; Kentaro Q. Sakamoto ABSTRACT Diving bradycardia is a reduction in the heart rate mediated by the parasympathetic system during diving. Although diving bradycardia is pronounced in aquatic mammals and birds, the existence...

... marginata ) during June 2017 (C) at 5 min sampling intervals for T b , T a and heart rate ( f H , red). Gaps in f H data indicate measurements that could not be calculated. Box turtles experienced gradual changes in T b ranging from a maximum increase of 3.2°C to a maximum decrease of −2.1°C...

... in a tank with conspecifics or confined to individual respirometers. After tag implantation under anaesthesia, heart rate ( f H ) required 60 h to recover to a stable value in a holding tank. Subsequently, when undisturbed under control conditions (normoxia, 21°C), mean f H was always significantly lower...

... in the ventricles of subordinate relative to dominant trout. However, collagen type I transcript and protein levels, and markers of collagen turnover were unaffected. Indicators of cardiac function, including ventricle passive stiffness and intrinsic heart rate ( f H ), similarly were unaffected. In vivo f H...

...Jaakko Haverinen; Irina Dzhumaniiazova; Denis V. Abramochkin; Minna Hassinen; Matti Vornanen ABSTRACT Heat tolerance of heart rate in fish is suggested to be limited by impaired electrical excitation of the ventricle due to the antagonistic effects of high temperature on Na + ( I Na ) and K + ( I...

... dives. We measured heart rate ( f H ) in six adult male bottlenose dolphins ( Tursiops truncatus ) spontaneously breathing at the surface to quantify the relationship between respiration and f H , and compared this with f H during submerged breath-holds. We found that dolphins exhibit a pronounced...

... their mothers under sea ice and to the bathypelagic zone, respectively. Studies on oxygen utilization patterns and heart rates while diving are limited, but the data indicate that immature marine mammals have a limited capacity to regulate heart rate (and hence oxygen utilization) during breath-hold...

.... At these sites, temperature-induced source–sink mismatch can reduce AP frequency, resulting in low-pass filtering or a complete block of signal transmission. In principle, this hypothesis can explain a number of heat-induced effects, including reduced heart rate, reduced synaptic transmission between neurons...

... flat ) temperatures were recorded. Over 8 weeks of constant submersion, the mean T crit of high-zone mussels decreased by 1.07°C from baseline, but low-zone mussels' mean T crit was unchanged. High- and low-zone mussels' mean maximum heart rate (HR) and resting HR decreased ∼12 and 35%, respectively. T...