Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)

Detalhes bibliográficos
Autor(a) principal: Chaves, Jussara N. [UNESP]
Data de Publicação: 2023
Outros Autores: Tattersall, Glenn J., Andrade, Denis V. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1242/jeb.245268
http://hdl.handle.net/11449/247001
Resumo: Body temperature regulation under changes in ambient temperature involves adjustments in heat production and heat exchange rates between the animal and the environment. One mechanism involves the modulation of the surface temperature of specific areas of the body through vasomotor adjustment. In homeotherms, this thermoregulatory adjustment is essential for the maintenance of body temperature over a moderate temperature range, known as the thermal neutral zone (TNZ). The bill of the toco toucan (Ramphastos toco) has been described as a highly efficient thermal window and hypothesized to assist in the thermal homeostasis of this bird. Herein, we directly evaluated the contribution of heat exchange through the bill of the toco toucan and role of the bill in the delimitation of the TNZ. To do this, we measured metabolic rate (MR), via oxygen consumption, over a range of ambient temperatures from 0 to 35°C. MR measurements were made in birds with the bill intact and with the bill insulated. The limits of the TNZ did not differ between treatments, ranging from 10.8 to 25.0°C. The MR differed among treatments only at elevated temperatures (30 and 35°C), reaching 0.92±0.11 ml O2 g−1 h−1 (mean±s.d.) for the intact group and 1.13±0.13 ml O2 g−1 h−1 for the insulated group. These results indicate that although heat dissipation through the bill does not contribute significantly to widening of the TNZ, it may well be critically important in assisting body temperature regulation at higher temperatures extending above the upper limit of the TNZ.
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spelling Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)Heat exchangeMetabolic rateThermal homeostasisThermal neutral zoneThermal windowBody temperature regulation under changes in ambient temperature involves adjustments in heat production and heat exchange rates between the animal and the environment. One mechanism involves the modulation of the surface temperature of specific areas of the body through vasomotor adjustment. In homeotherms, this thermoregulatory adjustment is essential for the maintenance of body temperature over a moderate temperature range, known as the thermal neutral zone (TNZ). The bill of the toco toucan (Ramphastos toco) has been described as a highly efficient thermal window and hypothesized to assist in the thermal homeostasis of this bird. Herein, we directly evaluated the contribution of heat exchange through the bill of the toco toucan and role of the bill in the delimitation of the TNZ. To do this, we measured metabolic rate (MR), via oxygen consumption, over a range of ambient temperatures from 0 to 35°C. MR measurements were made in birds with the bill intact and with the bill insulated. The limits of the TNZ did not differ between treatments, ranging from 10.8 to 25.0°C. The MR differed among treatments only at elevated temperatures (30 and 35°C), reaching 0.92±0.11 ml O2 g−1 h−1 (mean±s.d.) for the intact group and 1.13±0.13 ml O2 g−1 h−1 for the insulated group. These results indicate that although heat dissipation through the bill does not contribute significantly to widening of the TNZ, it may well be critically important in assisting body temperature regulation at higher temperatures extending above the upper limit of the TNZ.Departamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista, Rio ClaroDepartment of Biological Sciences Brock UniversityDepartamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista, Rio ClaroUniversidade Estadual Paulista (UNESP)Brock UniversityChaves, Jussara N. [UNESP]Tattersall, Glenn J.Andrade, Denis V. [UNESP]2023-07-29T12:56:20Z2023-07-29T12:56:20Z2023-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1242/jeb.245268Journal of Experimental Biology, v. 226, n. 5, 2023.1477-91450022-0949http://hdl.handle.net/11449/24700110.1242/jeb.2452682-s2.0-85149999417Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Experimental Biologyinfo:eu-repo/semantics/openAccess2023-07-29T12:56:20Zoai:repositorio.unesp.br:11449/247001Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:02:06.176970Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)
title Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)
spellingShingle Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)
Chaves, Jussara N. [UNESP]
Heat exchange
Metabolic rate
Thermal homeostasis
Thermal neutral zone
Thermal window
title_short Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)
title_full Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)
title_fullStr Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)
title_full_unstemmed Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)
title_sort Energetic costs of bill heat exchange demonstrate contributions to thermoregulation at high temperatures in toco toucans (Ramphastos toco)
author Chaves, Jussara N. [UNESP]
author_facet Chaves, Jussara N. [UNESP]
Tattersall, Glenn J.
Andrade, Denis V. [UNESP]
author_role author
author2 Tattersall, Glenn J.
Andrade, Denis V. [UNESP]
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
Brock University
dc.contributor.author.fl_str_mv Chaves, Jussara N. [UNESP]
Tattersall, Glenn J.
Andrade, Denis V. [UNESP]
dc.subject.por.fl_str_mv Heat exchange
Metabolic rate
Thermal homeostasis
Thermal neutral zone
Thermal window
topic Heat exchange
Metabolic rate
Thermal homeostasis
Thermal neutral zone
Thermal window
description Body temperature regulation under changes in ambient temperature involves adjustments in heat production and heat exchange rates between the animal and the environment. One mechanism involves the modulation of the surface temperature of specific areas of the body through vasomotor adjustment. In homeotherms, this thermoregulatory adjustment is essential for the maintenance of body temperature over a moderate temperature range, known as the thermal neutral zone (TNZ). The bill of the toco toucan (Ramphastos toco) has been described as a highly efficient thermal window and hypothesized to assist in the thermal homeostasis of this bird. Herein, we directly evaluated the contribution of heat exchange through the bill of the toco toucan and role of the bill in the delimitation of the TNZ. To do this, we measured metabolic rate (MR), via oxygen consumption, over a range of ambient temperatures from 0 to 35°C. MR measurements were made in birds with the bill intact and with the bill insulated. The limits of the TNZ did not differ between treatments, ranging from 10.8 to 25.0°C. The MR differed among treatments only at elevated temperatures (30 and 35°C), reaching 0.92±0.11 ml O2 g−1 h−1 (mean±s.d.) for the intact group and 1.13±0.13 ml O2 g−1 h−1 for the insulated group. These results indicate that although heat dissipation through the bill does not contribute significantly to widening of the TNZ, it may well be critically important in assisting body temperature regulation at higher temperatures extending above the upper limit of the TNZ.
publishDate 2023
dc.date.none.fl_str_mv 2023-07-29T12:56:20Z
2023-07-29T12:56:20Z
2023-03-01
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/10.1242/jeb.245268
Journal of Experimental Biology, v. 226, n. 5, 2023.
1477-9145
0022-0949
http://hdl.handle.net/11449/247001
10.1242/jeb.245268
2-s2.0-85149999417
url http://dx.doi.org/10.1242/jeb.245268
http://hdl.handle.net/11449/247001
identifier_str_mv Journal of Experimental Biology, v. 226, n. 5, 2023.
1477-9145
0022-0949
10.1242/jeb.245268
2-s2.0-85149999417
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.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
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