emperor penguins
Myoglobin production in emperor penguins
... developing emperor penguin chicks was associated with an increase in Mb mRNA, consistent with regulation of Mb content at the level of ...in emperor penguins appears to be more complex than we had ...
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Energy saving processes in huddling emperor penguins: from experiments to theory
... Free-ranging emperors maintain a rectal temperature of 35.5°C, i.e. 1.1°C lower than loosely grouped birds (36.6°C) and 2.2°C lower than isolated birds [37.7°C (Prévost, 1961; Prévost and Sapin- Jaloustre, 1964; Mougin, ...
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Stroke frequencies of emperor penguins diving under sea ice
... diving penguins has also been emphasized by Sato et ...king penguins Aptenodytes patagonicus, and reported that calculated diving air volume increased with maximum dive depth, suggesting that a smaller ...
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High affinity hemoglobin and blood oxygen saturation in diving emperor penguins
... P O2 electrodes (Licox C1.1 Revoxode; Integra LifeSciences, Plainsboro, NJ, USA) and thermistors (model 554, Yellow Springs Instruments, Yellow Springs, OH, USA) were inserted percutaneously into the aorta or vena cava ...
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Heart rate regulation and extreme bradycardia in diving emperor penguins
... king penguins (Halsey et ...in emperor penguins and validate the inference of respiration rate from the regular, momentary tachycardias present in f H ...
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Stroke rates and diving air volumes of emperor penguins: implications for dive performance
... To assess the possibility of exhalation of air prior to the gliding ascent, initial stroke rates during dives were examined in one bird (Fig.8). Interpretation of initial stroke rates during dives in Fig.8 is dependent ...
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The foraging ecology of emperor penguins (Aptenodytes forsteri) at two Mawson coast colonies, Antarctica
... The aims of the study were to determine: 1 the population size and reproductive success of emperor penguins breeding at Auster and Taylor Glacier, 2 the energy assimilation efficiency of[r] ...
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The foraging ecology of emperor penguins (Aptenodytes forsteri) at two Mawson coast colonies, Antarctica
... The food and energy requirements of adult emperor penguins parenting chicks were examined at Auster about 11,000 pairs and Taylor Glacier about 2,900 pairs colonies during the winter, sp[r] ...
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Point of no return in diving emperor penguins: is the timing of the decision to return limited by the number of strokes?
... context. Emperor penguins (Aptenodytes forsteri Gray 1844) are consummate avian divers, which have been reported to dive deeper than 550m (Wienecke et ...
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Returning on empty: extreme blood O2 depletion underlies dive capacity of emperor penguins
... could be inserted in the wing secondary to the axillary arterial plexus in emperor penguins (Trawa, 1970). The femoral vein was catheterized percutaneously (Ponganis et al., 1999) with 5- Fr nylon catheters ...
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What triggers the aerobic dive limit? Patterns of muscle oxygen depletion during dives of emperor penguins
... Non-breeding emperor penguins (8–15 birds per season, N16 for this experiment, 20–26kg) were captured on the sea ice of McMurdo Sound, Antarctica, in the austral spring of 2007 and ...2008. ...
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Kidnapping of chicks in emperor penguins: a hormonal by product?
... 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 ...
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Development of diving capacity in emperor penguins
... juvenile penguins do not represent a complete record of all dives during this period because of missed transmissions by the NOAA satellite, but they provide a first sampling of the diving depths and durations of ...
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O2 store management in diving emperor penguins
... non-breeding emperor penguins (Aptenodytes forsteri Gray, 20–30kg in body mass) were captured on the sea ice of McMurdo Sound or at Terra Nova Bay near Cape Washington (74°36 ⬘ , 165°24 ⬘ ...of ...
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Emperor penguins adjust swim speed according to the above water height of ice holes through which they exit
... Emperor penguins leap from the water onto the sea ...whether penguins adjusted swim speed in accordance with the above-water height of the ...ice. Penguins were maintained in a corral on the ...
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Why do satellite transmitters on emperor penguins stop transmitting?
... by emperor penguins swimming under ...the penguins, which included an under-ice observation chamber and diving hole through which the penguins could forage) in McMurdo Sound during previous ...
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Heart rates and swim speeds of emperor penguins diving under sea ice
... Our objectives were to measure 1 cardiac output and stroke volume in resting birds; 2 heart rate in birds while resting and diving; and 3 swim velocities from the same birds under condit[r] ...
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Air sac PO2 and oxygen depletion during dives of emperor penguins
... the 69·ml·kg –1 value measured during simulated dives of another deep-diving penguin, the king penguin (A. patagonicus; Ponganis et al., 1999). Although mean DRV during free dives may be greater than that during ...
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In pursuit of Irving and Scholander: a review of oxygen store management in seals and penguins
... muscle blood flow should be tailored to muscle workload in order to optimize the duration of aerobic metabolism (Davis and Kanatous, 1999). However, studies of California sea lions, Steller sea lions (Eumetopias ...
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A Study on Emotional Metaphors in Yellow Emperor
... In different cultural knowledge backgrounds and situations, people have different understandings for the same concept, that is, the concept structure in the integration process of meaning construction is not the same. ...
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