Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/224143 |
Resumo: | The tegu lizard Tupinambis merianae exhibits an episodic ventilatory pattern when dormant at 17 °C but a uniform ventilatory pattern when dormant at 25 °C. At 17 °C, ventilatory episodes were composed of 1-22 breaths interspaced by non-ventilatory periods lasting 1.8-26 min. Dormancy at the higher body temperature was accompanied by higher rates of O2 consumption and ventilation. The increase in ventilation was due only to increases in breathing frequency with no change observed in tidal volume. The air convection requirement for O2 did not differ at the two body temperatures. The respiratory quotient was 0.8 at 17 °C and 1.0 at 25 °C. We found no consistent relationship between expired gas composition and the start/end of the ventilatory period during episodic breathing at 17 °C. However, following non-ventilatory periods of increasing duration, there was an increase in the pulmonary O2 extraction that was not coupled to an equivalent increase in elimination of CO2 from the lungs. None of the changes in the variables studied could alone explain the initiation/termination of episodic ventilation in the tegus, suggesting that breathing episodes are shaped by a complex interaction between many variables. The estimated oxidative cost of breathing in dormant tegus at 17 °C was equivalent to 52.3 % of the total metabolic rate, indicating that breathing is the most costly activity during dormancy. |
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Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianaeBreathing patternCost of breathingDormancyGas exchangeMetabolic rateTegu lizardTupinambis merianaeVentilationThe tegu lizard Tupinambis merianae exhibits an episodic ventilatory pattern when dormant at 17 °C but a uniform ventilatory pattern when dormant at 25 °C. At 17 °C, ventilatory episodes were composed of 1-22 breaths interspaced by non-ventilatory periods lasting 1.8-26 min. Dormancy at the higher body temperature was accompanied by higher rates of O2 consumption and ventilation. The increase in ventilation was due only to increases in breathing frequency with no change observed in tidal volume. The air convection requirement for O2 did not differ at the two body temperatures. The respiratory quotient was 0.8 at 17 °C and 1.0 at 25 °C. We found no consistent relationship between expired gas composition and the start/end of the ventilatory period during episodic breathing at 17 °C. However, following non-ventilatory periods of increasing duration, there was an increase in the pulmonary O2 extraction that was not coupled to an equivalent increase in elimination of CO2 from the lungs. None of the changes in the variables studied could alone explain the initiation/termination of episodic ventilation in the tegus, suggesting that breathing episodes are shaped by a complex interaction between many variables. The estimated oxidative cost of breathing in dormant tegus at 17 °C was equivalent to 52.3 % of the total metabolic rate, indicating that breathing is the most costly activity during dormancy.Departamento de Zoologia Universidade Estadual Paulista, Caixa Postal 199, 13506-900 Rio Claro, SPDepartamento de Zoologia Universidade Estadual Paulista, Caixa Postal 199, 13506-900 Rio Claro, SPUniversidade Estadual Paulista (UNESP)De Andrade, Denis Vieira [UNESP]Abe, Augusto Shinya [UNESP]2022-04-28T19:54:55Z2022-04-28T19:54:55Z1999-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article3677-3685Journal of Experimental Biology, v. 202, n. 24, p. 3677-3685, 1999.0022-0949http://hdl.handle.net/11449/2241432-s2.0-0033403319Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Experimental Biologyinfo:eu-repo/semantics/openAccess2022-04-28T19:54:55Zoai:repositorio.unesp.br:11449/224143Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:53:18.212765Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae |
title |
Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae |
spellingShingle |
Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae De Andrade, Denis Vieira [UNESP] Breathing pattern Cost of breathing Dormancy Gas exchange Metabolic rate Tegu lizard Tupinambis merianae Ventilation |
title_short |
Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae |
title_full |
Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae |
title_fullStr |
Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae |
title_full_unstemmed |
Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae |
title_sort |
Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae |
author |
De Andrade, Denis Vieira [UNESP] |
author_facet |
De Andrade, Denis Vieira [UNESP] Abe, Augusto Shinya [UNESP] |
author_role |
author |
author2 |
Abe, Augusto Shinya [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
De Andrade, Denis Vieira [UNESP] Abe, Augusto Shinya [UNESP] |
dc.subject.por.fl_str_mv |
Breathing pattern Cost of breathing Dormancy Gas exchange Metabolic rate Tegu lizard Tupinambis merianae Ventilation |
topic |
Breathing pattern Cost of breathing Dormancy Gas exchange Metabolic rate Tegu lizard Tupinambis merianae Ventilation |
description |
The tegu lizard Tupinambis merianae exhibits an episodic ventilatory pattern when dormant at 17 °C but a uniform ventilatory pattern when dormant at 25 °C. At 17 °C, ventilatory episodes were composed of 1-22 breaths interspaced by non-ventilatory periods lasting 1.8-26 min. Dormancy at the higher body temperature was accompanied by higher rates of O2 consumption and ventilation. The increase in ventilation was due only to increases in breathing frequency with no change observed in tidal volume. The air convection requirement for O2 did not differ at the two body temperatures. The respiratory quotient was 0.8 at 17 °C and 1.0 at 25 °C. We found no consistent relationship between expired gas composition and the start/end of the ventilatory period during episodic breathing at 17 °C. However, following non-ventilatory periods of increasing duration, there was an increase in the pulmonary O2 extraction that was not coupled to an equivalent increase in elimination of CO2 from the lungs. None of the changes in the variables studied could alone explain the initiation/termination of episodic ventilation in the tegus, suggesting that breathing episodes are shaped by a complex interaction between many variables. The estimated oxidative cost of breathing in dormant tegus at 17 °C was equivalent to 52.3 % of the total metabolic rate, indicating that breathing is the most costly activity during dormancy. |
publishDate |
1999 |
dc.date.none.fl_str_mv |
1999-12-01 2022-04-28T19:54:55Z 2022-04-28T19:54:55Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Journal of Experimental Biology, v. 202, n. 24, p. 3677-3685, 1999. 0022-0949 http://hdl.handle.net/11449/224143 2-s2.0-0033403319 |
identifier_str_mv |
Journal of Experimental Biology, v. 202, n. 24, p. 3677-3685, 1999. 0022-0949 2-s2.0-0033403319 |
url |
http://hdl.handle.net/11449/224143 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Experimental Biology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
3677-3685 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128995735109632 |