[PDF] Top 20 Heart rate regulation and extreme bradycardia in diving emperor penguins

... Non-breeding emperor penguins (~15 birds/season, N=9 for this study, 25.1±0.6·kg) were captured near the McMurdo Sound ice edge or at Terra Nova Bay in October of 2001, 2004, and 2005 and were maintained ... See full document

... of bradycardia and peripheral vasoconstriction in diving emperor penguins, in which muscle is isolated from the circulation during the dive, and lactate washout occurs during the eupneic ... See full document

... Conceivably, extreme exercise or stress during disturbances might also elevate sympathetic tone and promote such ...a diving animal was stressed, altered ascent and dove deeper, or was unable to access the ... See full document

... When Yoda and Ropert-Coudert (2004) developed a similar model for Adélie penguin’s leaping, they considered the distance between the center of gravity of a penguin and its feet, because Adélie penguins land on the ... See full document

... the emperor penguin Aptenodytes forsteri Gray, where the kidnapping of chicks by failed breeders is commonly observed (Jouventin et ...In emperor penguins, ultimate factors could not explain ... See full document

... the penguins delay their ascent ...before diving, and the free-swimming Weddell seal Leptonychotes weddellii protects itself from nitrogen narcosis and decompression sickness by limiting blood nitrogen ... See full document

... and diving capacities ...African penguins, Spheniscus demersus, by almost a third (Wilson, 1985), and drastic alterations in diving behaviour have been noted following an artificial increase in the ... See full document

... used. Heart rate was also counted from the radio signal for this 5 min ...resting rate in darkness. Five of the penguins remained in the respirometer overnight, for a total of 24 h, to gather ... See full document

... in heart rate during the dive cycle might be related to dive duration, stepwise multiple linear regression analysis was ...mean diving f H , minimum diving f H , minimum f H within the first ... See full document

... Germany). The channel was sealed with one transparent polyethylene sheet (35 m 3 4.5 m, thickness 0.5 mm, Ewert, Munich, Germany) and filled with sea water from the nearby beach (130 m) using a motor pump equipped with a ... See full document

... king penguins was determined from the measurement of their total body water (TBW) using tritiated water, as described and validated previously in another seabird species, the great-winged petrel Pterodroma ... See full document

... The diving physiology of Cuvier’s and Blainville’s beaked whales is of special interest because of reports of the presence of gas and fat emboli in these species during atypical mass strandings associated with the ... See full document

... causation of the bradycardia, even though training apparently achieves greater work capacity at lowered total blood flow. Our knowledge of the changes in circulatory[r] ... See full document

... If, from the present data, heart rate at mean dive duration is used to calculate oxygen consumption during diving from the heart rate/oxygen consumption relationship during swimming, the[r] ... See full document

... king penguins accumulate lactic acid during long dives and pay off the ‘oxygen debt’ by increasing surface times or surface frequency is not supported by the present ...and/or heart during relatively short, ... See full document

... Surface swimming probably represents the closest approximation to diving exercise in normally ventilating ducks, and if the heart rate versus oxygen uptake relationship during surface sw[r] ... See full document

... adult emperor pen- guins that were tracked after their ...of emperor penguins, these birds were robust, 25–35 kg adults with years of foraging and predator avoidance ... See full document

... Since it is likely that both both the sympathetic and parasympathetic innervation to the heart run in the vagus, and since yohimbine injection slowed the rate of recovery while not havin[r] ... See full document

... While under the sea ice of McMurdo Sound, emperor penguins primarily feed on the sub-ice fish, Pagothenia borchgrevinki (Ponganis et al., 2000). Dive durations of 5–12·min are common, and dive depths are ... See full document

... The increased workload imposed on the penguins equipped with the larger Crittercam system had a significant negative effect on dive duration, but not on mean stroke frequencies. This suggests that the Crittercam ... See full document