Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/19637
Título: Heart rates and gas exchange in the Amazonian Manatee (Trichechus inunguis) in relation to diving
Autor: Gallivan, Gordon James
Kanwisher, John W.
Best, Robin C.
Palavras-chave: Carbon Dioxide
Oxygen
Animals
Breathing
Comparative Study
Diving
Heart Rate
Lung Gas Exchange
Physiology
Seal
Time
Animals
Carbon Dioxide
Comparative Study
Diving
Heart Rate
Oxygen
Pinnipedia
Pulmonary Gas Exchange
Respiration
Support, Non-u.S. Gov't
Time Factors
Data do documento: 1986
Revista: Journal of Comparative Physiology B
É parte de: Volume 156, Número 3, Pags. 415-423
Abstract: 1. Unrestrained Amazonian manatees (Trichechus inunguis) maintained a constant heart rate during diving and exhibited a slight tachycardia during breathing. 'Forcing' the manatees to dive caused a marked bradycardia. They exhibited a more pronounced tachycardia during breathing after 'forced' dives and hyperventilated during recovery dives. 2. Manatees are capable of dives exceeding 10 min duration without having to resport to anaerobic metabolism, and even after 10 min dives recover within 3-4 short dives. The ability of manatees to make long dives, in spite of relatively poor O2 stores, is due to their low metabolic rate, while the rapid recovery is aided by their high CO2 stores which minimizes CO2 storage in the body. 3. In manatees the changes in alveolar O2 and CO2 pressure ( {Mathematical expression} and {Mathematical expression}) in relation to dive time are slower and more variable than in other marine mammals. The lower rate of change is probably due to the manatees' reduced metabolic rate, while the greater variability is due to their breathing pattern, in which both ventilation and body gas stores influence alveolar gases. © 1986 Springer-Verlag.
DOI: 10.1007/BF01101104
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