Development of diving capacity in emperor penguins
نویسندگان
چکیده
منابع مشابه
O2 store management in diving emperor penguins.
In order to further define O(2) store utilization during dives and understand the physiological basis of the aerobic dive limit (ADL, dive duration associated with the onset of post-dive blood lactate accumulation), emperor penguins (Aptenodytes forsteri) were equipped with either a blood partial pressure of oxygen (P(O(2))) recorder or a blood sampler while they were diving at an isolated dive...
متن کاملThe development of diving capacity in juvenile emperor
penguins (Aptenodytes forsteri) should be critical to their survival and success, especially during their first trip to sea in which they travel beyond the Antarctic Circle (Kooyman et al., 1996). However, little is known about the diving ability of juveniles or about the development of the physiological factors underlying that ability. In a study of penguin myoglobin (Mb), Weber et al. (1974) ...
متن کاملHeart rate regulation and extreme bradycardia in diving emperor penguins.
To investigate the diving heart rate (f(H)) response of the emperor penguin (Aptenodytes forsteri), the consummate avian diver, birds diving at an isolated dive hole in McMurdo Sound, Antarctica were outfitted with digital electrocardiogram recorders, two-axis accelerometers and time depth recorders (TDRs). In contrast to any other freely diving bird, a true bradycardia (f(H) significantly <f(H...
متن کاملMyoglobin production in emperor penguins.
Increased oxygen storage is essential to the diving capacities of marine mammals and seabirds. However, the molecular mechanisms underlying this adaptation are unknown. Myoglobin (Mb) and Mb mRNA concentrations were analyzed in emperor penguin (Aptenodytes forsteri) adults and chicks with spectrophotometric and RNase protection assays to evaluate production of their large Mb-bound O(2) stores. ...
متن کاملHigh-affinity hemoglobin and blood oxygen saturation in diving emperor penguins.
The emperor penguin (Aptenodytes forsteri) thrives in the Antarctic underwater environment, diving to depths greater than 500 m and for durations longer than 23 min. To examine mechanisms underlying the exceptional diving ability of this species and further describe blood oxygen (O2) transport and depletion while diving, we characterized the O2-hemoglobin (Hb) dissociation curve of the emperor ...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 1999
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.202.7.781