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Keywords: emperor penguin
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Journal Articles
J Exp Biol (2011) 214 (17): 2854–2863.
Published: 1 September 2011
...Katsufumi Sato; Kozue Shiomi; Greg Marshall; Gerald L. Kooyman; Paul J. Ponganis SUMMARY Emperor penguins ( Aptenodytes forsteri ), both at sea and at an experimental dive hole, often have minimal surface periods even after performance of dives far beyond their measured 5.6 min aerobic dive limit...
Journal Articles
J Exp Biol (2011) 214 (11): 1802–1812.
Published: 1 June 2011
...-infrared spectrophotometer was developed and used to measure myoglobin (Mb) O 2 saturation levels in the locomotory muscle during dives of emperor penguins ( Aptenodytes forsteri ). Two distinct patterns of muscle O 2 depletion were observed. Type A dives had a monotonic decline, and, in dives near the ADL...
Journal Articles
J Exp Biol (2010) 213 (11): 1901–1906.
Published: 1 June 2010
... 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. Mean pectoral Mb concentration and Mb mRNA content increased throughout the pre-fledging period and were 15-fold and 3-fold greater...
Journal Articles
J Exp Biol (2009) 212 (2): 217–224.
Published: 15 January 2009
... 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 hole in the sea ice of McMurdo Sound, Antarctica. Arterial P O 2 profiles (57 dives) revealed that (a) pre-dive P...
Journal Articles
J Exp Biol (2008) 211 (8): 1169–1179.
Published: 15 April 2008
...Jessica U. Meir; Torre K. Stockard; Cassondra L. Williams; Katherine V. Ponganis; Paul J. Ponganis SUMMARY 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...
Journal Articles
J Exp Biol (2008) 211 (1): 1–8.
Published: 1 January 2008
...Caroline Gilbert; Stéphane Blanc; Yvon Le Maho; André Ancel SUMMARY This paper investigates the energy savings of male emperor penguins Aptenodytes forsteri linked to their huddling behaviour, the key factor that allows them to assume their incubating task while undergoing a long fast. Drawing...
Journal Articles
J Exp Biol (2007) 210 (24): 4279–4285.
Published: 15 December 2007
...P. J. Ponganis; T. K. Stockard; J. U. Meir; C. L. Williams; K. V. Ponganis; R. P. van Dam; R. Howard SUMMARY Blood gas analyses from emperor penguins ( Aptenodytes forsteri ) at rest, and intravascular P O 2 profiles from free-diving birds were obtained in order to examine hypoxemic tolerance...
Journal Articles
J Exp Biol (2006) 209 (8): 1413–1420.
Published: 15 April 2006
... of this behaviour in emperor penguins ( Aptenodytes forsteri ), whose failed breeders often kidnap chicks. We experimentally tested the hypothesis that kidnapping behaviour was the result of high residual levels of prolactin (PRL), a hormone involved in parental behaviour. Penguins with artificially decreased PRL...
Journal Articles
J Exp Biol (2005) 208 (15): 2973–2980.
Published: 1 August 2005
...T. Knower Stockard; J. Heil; J. U. Meir; K. Sato; K. V. Ponganis; P. J. Ponganis SUMMARY In order to determine the rate and magnitude of respiratory O 2 depletion during dives of emperor penguins ( Aptenodytes forsteri ),air sac O 2 partial pressure ( P O 2 )was recorded in 73 dives of four birds...
Journal Articles
J Exp Biol (2002) 205 (24): 3769–3774.
Published: 15 December 2002
... and, hence,increase the aerobic dive limit (ADL, dive duration associated with onset of lactate accumulation). A 5.6 min ADL for emperor penguins had been previously determined with lactate measurements after dives of <50 m depth. In order to assess locomotory patterns during such dives, longitudinal...