Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguana
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.cbpa.2016.12.020 http://hdl.handle.net/11449/162501 |
Resumo: | Oxygen consumption (VO2), heart rate (f(H)), heart mass (M-h) and body mass (M-b) were measured during embryonic incubation and in hatchlings of green iguana (Iguana iguana). Meanf(H) and VO2 were unvarying in early stage embryos. VO2 increased exponentially during the later stages of embryonic development, doubling by the end of incubation, whilef(H) was constant, resulting in a 2.7-fold increase in oxygen pulse. Compared to late stage embryos, the mean inactive level of VO2 in hatchlings was 1.7 fold higher, while fH was reduced by half resulting in a further 3.6 fold increase in oxygen pulse. There was an overall negative correlation between meanf(H) and VO2 when data from hatchlings was included. Thus, predicting metabolic rate as VO2 from measurements of f(H) is not possible in embryonic reptiles. Convective transport of oxygen to supply metabolism during embryonic incubation was more reliably indicated as an index of cardiac output (COi) derived from the product of f(H) and Mb. However, a thorough analysis of factors determining rates of oxygen supply during development and eclosion in reptiles will require cannulation of blood vessels that proved impossible in the present study, to determine oxygen carrying capacity by the blood and arteriovenous oxygen content difference (A-V cliff), plus patterns of blood flow. (C) 2016 Elsevier Inc. All rights reserved. |
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Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguanaIguanaReptileEmbryoGrowthOxygen uptakeHeart rateOxygen pulseOxygen consumption (VO2), heart rate (f(H)), heart mass (M-h) and body mass (M-b) were measured during embryonic incubation and in hatchlings of green iguana (Iguana iguana). Meanf(H) and VO2 were unvarying in early stage embryos. VO2 increased exponentially during the later stages of embryonic development, doubling by the end of incubation, whilef(H) was constant, resulting in a 2.7-fold increase in oxygen pulse. Compared to late stage embryos, the mean inactive level of VO2 in hatchlings was 1.7 fold higher, while fH was reduced by half resulting in a further 3.6 fold increase in oxygen pulse. There was an overall negative correlation between meanf(H) and VO2 when data from hatchlings was included. Thus, predicting metabolic rate as VO2 from measurements of f(H) is not possible in embryonic reptiles. Convective transport of oxygen to supply metabolism during embryonic incubation was more reliably indicated as an index of cardiac output (COi) derived from the product of f(H) and Mb. However, a thorough analysis of factors determining rates of oxygen supply during development and eclosion in reptiles will require cannulation of blood vessels that proved impossible in the present study, to determine oxygen carrying capacity by the blood and arteriovenous oxygen content difference (A-V cliff), plus patterns of blood flow. (C) 2016 Elsevier Inc. All rights reserved.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)National Science FoundationUniv Estadual Paulista, Inst Biociencias, Dept Zool, Campus Rio Claro, BR-13506900 Sao Paulo, SP, BrazilUniv North Texas Denton, Dev Integrat Biol Cluster, Dept Biol Sci, Denton, TX 76203 USAUniv Birmingham, Sch Biosci, Birmingham B15 2TT, W Midlands, EnglandUniv Estadual Paulista, Inst Biociencias, Dept Zool, Campus Rio Claro, BR-13506900 Sao Paulo, SP, BrazilFAPESP: 2010/51995-4FAPESP: 2012/06938-8FAPESP: 2012/16537-0CNPq: CNPq 401061/2014-0National Science Foundation: IBN-10S 0845741Elsevier B.V.Universidade Estadual Paulista (Unesp)Univ North Texas DentonUniv BirminghamSartori, Marina R. [UNESP]Abe, Augusto S. [UNESP]Crossley, Dane A.Taylor, Edwin W. [UNESP]2018-11-26T17:20:01Z2018-11-26T17:20:01Z2017-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article28-34application/pdfhttp://dx.doi.org/10.1016/j.cbpa.2016.12.020Comparative Biochemistry And Physiology A-molecular & Integrative Physiology. New York: Elsevier Science Inc, v. 205, p. 28-34, 2017.1095-6433http://hdl.handle.net/11449/16250110.1016/j.cbpa.2016.12.020WOS:000394478100004WOS000394478100004.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengComparative Biochemistry And Physiology A-molecular & Integrative Physiology0,836info:eu-repo/semantics/openAccess2023-11-18T06:14:32Zoai:repositorio.unesp.br:11449/162501Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:04:36.176529Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguana |
title |
Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguana |
spellingShingle |
Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguana Sartori, Marina R. [UNESP] Iguana Reptile Embryo Growth Oxygen uptake Heart rate Oxygen pulse |
title_short |
Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguana |
title_full |
Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguana |
title_fullStr |
Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguana |
title_full_unstemmed |
Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguana |
title_sort |
Rates of oxygen uptake increase independently of changes in heart rate in late stages of development and at hatching in the green iguana, Iguana iguana |
author |
Sartori, Marina R. [UNESP] |
author_facet |
Sartori, Marina R. [UNESP] Abe, Augusto S. [UNESP] Crossley, Dane A. Taylor, Edwin W. [UNESP] |
author_role |
author |
author2 |
Abe, Augusto S. [UNESP] Crossley, Dane A. Taylor, Edwin W. [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Univ North Texas Denton Univ Birmingham |
dc.contributor.author.fl_str_mv |
Sartori, Marina R. [UNESP] Abe, Augusto S. [UNESP] Crossley, Dane A. Taylor, Edwin W. [UNESP] |
dc.subject.por.fl_str_mv |
Iguana Reptile Embryo Growth Oxygen uptake Heart rate Oxygen pulse |
topic |
Iguana Reptile Embryo Growth Oxygen uptake Heart rate Oxygen pulse |
description |
Oxygen consumption (VO2), heart rate (f(H)), heart mass (M-h) and body mass (M-b) were measured during embryonic incubation and in hatchlings of green iguana (Iguana iguana). Meanf(H) and VO2 were unvarying in early stage embryos. VO2 increased exponentially during the later stages of embryonic development, doubling by the end of incubation, whilef(H) was constant, resulting in a 2.7-fold increase in oxygen pulse. Compared to late stage embryos, the mean inactive level of VO2 in hatchlings was 1.7 fold higher, while fH was reduced by half resulting in a further 3.6 fold increase in oxygen pulse. There was an overall negative correlation between meanf(H) and VO2 when data from hatchlings was included. Thus, predicting metabolic rate as VO2 from measurements of f(H) is not possible in embryonic reptiles. Convective transport of oxygen to supply metabolism during embryonic incubation was more reliably indicated as an index of cardiac output (COi) derived from the product of f(H) and Mb. However, a thorough analysis of factors determining rates of oxygen supply during development and eclosion in reptiles will require cannulation of blood vessels that proved impossible in the present study, to determine oxygen carrying capacity by the blood and arteriovenous oxygen content difference (A-V cliff), plus patterns of blood flow. (C) 2016 Elsevier Inc. All rights reserved. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-03-01 2018-11-26T17:20:01Z 2018-11-26T17:20:01Z |
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 |
http://dx.doi.org/10.1016/j.cbpa.2016.12.020 Comparative Biochemistry And Physiology A-molecular & Integrative Physiology. New York: Elsevier Science Inc, v. 205, p. 28-34, 2017. 1095-6433 http://hdl.handle.net/11449/162501 10.1016/j.cbpa.2016.12.020 WOS:000394478100004 WOS000394478100004.pdf |
url |
http://dx.doi.org/10.1016/j.cbpa.2016.12.020 http://hdl.handle.net/11449/162501 |
identifier_str_mv |
Comparative Biochemistry And Physiology A-molecular & Integrative Physiology. New York: Elsevier Science Inc, v. 205, p. 28-34, 2017. 1095-6433 10.1016/j.cbpa.2016.12.020 WOS:000394478100004 WOS000394478100004.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Comparative Biochemistry And Physiology A-molecular & Integrative Physiology 0,836 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
28-34 application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science 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_ |
1808128890691911680 |