Droplet bubbling evaporatively cools a blowfly

Detalhes bibliográficos
Autor(a) principal: Gomes, Guilherme
Data de Publicação: 2018
Outros Autores: Köberle, Roland, Von Zuben, Claudio J. [UNESP], Andrade, Denis V. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1038/s41598-018-23670-2
http://hdl.handle.net/11449/179802
Resumo: Terrestrial animals often use evaporative cooling to lower body temperature. Evaporation can occur from humid body surfaces or from fluids interfaced to the environment through a number of different mechanisms, such as sweating or panting. In Diptera, some flies move tidally a droplet of fluid out and then back in the buccopharyngeal cavity for a repeated number of cycles before eventually ingesting it. This is referred to as the bubbling behaviour. The droplet fluid consists of a mix of liquids from the ingested food, enzymes from the salivary glands, and antimicrobials, associated to the crop organ system, with evidence pointing to a role in liquid meal dehydration. Herein, we demonstrate that the bubbling behaviour also serves as an effective thermoregulatory mechanism to lower body temperature by means of evaporative cooling. In the blowfly, Chrysomya megacephala, infrared imaging revealed that as the droplet is extruded, evaporation lowers the fluids temperature, which, upon its re-ingestion, lowers the blowfly's body temperature. This effect is most prominent at the cephalic region, less in the thorax, and then in the abdomen. Bubbling frequency increases with ambient temperature, while its cooling efficiency decreases at high air humidities. Heat transfer calculations show that droplet cooling depends on a special heat-exchange dynamic, which result in the exponential activation of the cooling effect.
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spelling Droplet bubbling evaporatively cools a blowflyTerrestrial animals often use evaporative cooling to lower body temperature. Evaporation can occur from humid body surfaces or from fluids interfaced to the environment through a number of different mechanisms, such as sweating or panting. In Diptera, some flies move tidally a droplet of fluid out and then back in the buccopharyngeal cavity for a repeated number of cycles before eventually ingesting it. This is referred to as the bubbling behaviour. The droplet fluid consists of a mix of liquids from the ingested food, enzymes from the salivary glands, and antimicrobials, associated to the crop organ system, with evidence pointing to a role in liquid meal dehydration. Herein, we demonstrate that the bubbling behaviour also serves as an effective thermoregulatory mechanism to lower body temperature by means of evaporative cooling. In the blowfly, Chrysomya megacephala, infrared imaging revealed that as the droplet is extruded, evaporation lowers the fluids temperature, which, upon its re-ingestion, lowers the blowfly's body temperature. This effect is most prominent at the cephalic region, less in the thorax, and then in the abdomen. Bubbling frequency increases with ambient temperature, while its cooling efficiency decreases at high air humidities. Heat transfer calculations show that droplet cooling depends on a special heat-exchange dynamic, which result in the exponential activation of the cooling effect.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Department of Physics and Interdisciplinary Science São Carlos Institute of Physics (IFSC) University of São Paulo (USP)Departament of Zoology Institute of Biosciences (IB) São Paulo State University (UNESP)Departament of Zoology Institute of Biosciences (IB) São Paulo State University (UNESP)FAPESP: 2007/05080-1FAPESP: 2013/04190-9FAPESP: 2013/20627-8FAPESP: 2017/17722-0CNPq: 306811/2015-4CNPq: 308734/2016-5Universidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Gomes, GuilhermeKöberle, RolandVon Zuben, Claudio J. [UNESP]Andrade, Denis V. [UNESP]2018-12-11T17:36:49Z2018-12-11T17:36:49Z2018-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://dx.doi.org/10.1038/s41598-018-23670-2Scientific Reports, v. 8, n. 1, 2018.2045-2322http://hdl.handle.net/11449/17980210.1038/s41598-018-23670-22-s2.0-850459320182-s2.0-85045932018.pdf75628510167953810000-0002-9622-3254Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengScientific Reports1,533info:eu-repo/semantics/openAccess2023-12-11T06:15:43Zoai:repositorio.unesp.br:11449/179802Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:02:12.743075Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Droplet bubbling evaporatively cools a blowfly
title Droplet bubbling evaporatively cools a blowfly
spellingShingle Droplet bubbling evaporatively cools a blowfly
Gomes, Guilherme
title_short Droplet bubbling evaporatively cools a blowfly
title_full Droplet bubbling evaporatively cools a blowfly
title_fullStr Droplet bubbling evaporatively cools a blowfly
title_full_unstemmed Droplet bubbling evaporatively cools a blowfly
title_sort Droplet bubbling evaporatively cools a blowfly
author Gomes, Guilherme
author_facet Gomes, Guilherme
Köberle, Roland
Von Zuben, Claudio J. [UNESP]
Andrade, Denis V. [UNESP]
author_role author
author2 Köberle, Roland
Von Zuben, Claudio J. [UNESP]
Andrade, Denis V. [UNESP]
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade de São Paulo (USP)
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Gomes, Guilherme
Köberle, Roland
Von Zuben, Claudio J. [UNESP]
Andrade, Denis V. [UNESP]
description Terrestrial animals often use evaporative cooling to lower body temperature. Evaporation can occur from humid body surfaces or from fluids interfaced to the environment through a number of different mechanisms, such as sweating or panting. In Diptera, some flies move tidally a droplet of fluid out and then back in the buccopharyngeal cavity for a repeated number of cycles before eventually ingesting it. This is referred to as the bubbling behaviour. The droplet fluid consists of a mix of liquids from the ingested food, enzymes from the salivary glands, and antimicrobials, associated to the crop organ system, with evidence pointing to a role in liquid meal dehydration. Herein, we demonstrate that the bubbling behaviour also serves as an effective thermoregulatory mechanism to lower body temperature by means of evaporative cooling. In the blowfly, Chrysomya megacephala, infrared imaging revealed that as the droplet is extruded, evaporation lowers the fluids temperature, which, upon its re-ingestion, lowers the blowfly's body temperature. This effect is most prominent at the cephalic region, less in the thorax, and then in the abdomen. Bubbling frequency increases with ambient temperature, while its cooling efficiency decreases at high air humidities. Heat transfer calculations show that droplet cooling depends on a special heat-exchange dynamic, which result in the exponential activation of the cooling effect.
publishDate 2018
dc.date.none.fl_str_mv 2018-12-11T17:36:49Z
2018-12-11T17:36:49Z
2018-12-01
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/10.1038/s41598-018-23670-2
Scientific Reports, v. 8, n. 1, 2018.
2045-2322
http://hdl.handle.net/11449/179802
10.1038/s41598-018-23670-2
2-s2.0-85045932018
2-s2.0-85045932018.pdf
7562851016795381
0000-0002-9622-3254
url http://dx.doi.org/10.1038/s41598-018-23670-2
http://hdl.handle.net/11449/179802
identifier_str_mv Scientific Reports, v. 8, n. 1, 2018.
2045-2322
10.1038/s41598-018-23670-2
2-s2.0-85045932018
2-s2.0-85045932018.pdf
7562851016795381
0000-0002-9622-3254
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Scientific Reports
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dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
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instname_str Universidade Estadual Paulista (UNESP)
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institution UNESP
reponame_str Repositório Institucional da UNESP
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