Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae)
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/10.1086/690189 http://hdl.handle.net/11449/162674 |
Resumo: | Because of their permeable skin, terrestrial amphibians are constantly challenged by the potential risk of dehydration. However, some of the physiological consequences associated with dehydration may affect aspects that are themselves relevant to the regulation of water balance. Accordingly, we examined the effects of graded levels of dehydration on the rates of evaporative water loss and water absorption through the skin in the terrestrial Neotropical toad, Rhinella schneideri. Concomitantly, we monitored the effects of dehydration on the mass of visceral organs; hematocrit and hemoglobin content; plasma osmolality; and plasma concentration of urea, sodium, chloride, and potassium. We found that dehydration caused an increase in the concentration of body fluids, as indicated by virtually all the parameters examined. There was a proportional change in the relative masses of visceral organs, except for the liver and kidneys, which exhibited a decrease in their relative masses greater than the whole-body level of dehydration. Changesor the preservationof relative organ masses during dehydration may be explained by organ-specific physiological adjustments in response to the functional stress introduced by the dehydration itself. As dehydration progressed, evaporative water loss diminished and water reabsorption increased. In both cases, the increase in body fluid concentration associated with the dehydration provided the osmotic driver for these changes in water flux. Additionally, dehydration-induced alterations on the cutaneous barrier may also have contributed to the decrease in water flux. Dehydration, therefore, while posing a considerable challenge on the water balance regulation of anurans, paradoxically facilitates water conservation and absorption. |
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Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae)amphibiansAnuraevaporative water lossrehydrationwater balanceBecause of their permeable skin, terrestrial amphibians are constantly challenged by the potential risk of dehydration. However, some of the physiological consequences associated with dehydration may affect aspects that are themselves relevant to the regulation of water balance. Accordingly, we examined the effects of graded levels of dehydration on the rates of evaporative water loss and water absorption through the skin in the terrestrial Neotropical toad, Rhinella schneideri. Concomitantly, we monitored the effects of dehydration on the mass of visceral organs; hematocrit and hemoglobin content; plasma osmolality; and plasma concentration of urea, sodium, chloride, and potassium. We found that dehydration caused an increase in the concentration of body fluids, as indicated by virtually all the parameters examined. There was a proportional change in the relative masses of visceral organs, except for the liver and kidneys, which exhibited a decrease in their relative masses greater than the whole-body level of dehydration. Changesor the preservationof relative organ masses during dehydration may be explained by organ-specific physiological adjustments in response to the functional stress introduced by the dehydration itself. As dehydration progressed, evaporative water loss diminished and water reabsorption increased. In both cases, the increase in body fluid concentration associated with the dehydration provided the osmotic driver for these changes in water flux. Additionally, dehydration-induced alterations on the cutaneous barrier may also have contributed to the decrease in water flux. Dehydration, therefore, while posing a considerable challenge on the water balance regulation of anurans, paradoxically facilitates water conservation and absorption.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Estadual Paulista, Inst Biociencias, Dept Zool, Sao Paulo, BrazilUniv Estadual Paulista, Ctr Estudos Ambientais, Sao Paulo, BrazilUniv Estadual Paulista, Inst Biociencias, Dept Zool, Sao Paulo, BrazilUniv Estadual Paulista, Ctr Estudos Ambientais, Sao Paulo, BrazilFAPESP: 10/20061-6FAPESP: 13/04190-9CNPq: 302045/2012-0CNPq: 306811/2015-4CNPq: 13/14-25780Univ Chicago PressUniversidade Estadual Paulista (Unesp)Anderson, Rodolfo C. O. [UNESP]Bovo, Rafael P. [UNESP]Eismann, Carlos E. [UNESP]Menegario, Amauri A. [UNESP]Andrade, Denis V. [UNESP]2018-11-26T17:24:24Z2018-11-26T17:24:24Z2017-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article313-320application/pdfhttp://dx.doi.org/10.1086/690189Physiological And Biochemical Zoology. Chicago: Univ Chicago Press, v. 90, n. 3, p. 313-320, 2017.1522-2152http://hdl.handle.net/11449/16267410.1086/690189WOS:000398802900002WOS000398802900002.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysiological And Biochemical Zoology0,904info:eu-repo/semantics/openAccess2024-04-10T19:22:25Zoai:repositorio.unesp.br:11449/162674Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:26:10.827617Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae) |
title |
Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae) |
spellingShingle |
Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae) Anderson, Rodolfo C. O. [UNESP] amphibians Anura evaporative water loss rehydration water balance |
title_short |
Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae) |
title_full |
Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae) |
title_fullStr |
Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae) |
title_full_unstemmed |
Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae) |
title_sort |
Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae) |
author |
Anderson, Rodolfo C. O. [UNESP] |
author_facet |
Anderson, Rodolfo C. O. [UNESP] Bovo, Rafael P. [UNESP] Eismann, Carlos E. [UNESP] Menegario, Amauri A. [UNESP] Andrade, Denis V. [UNESP] |
author_role |
author |
author2 |
Bovo, Rafael P. [UNESP] Eismann, Carlos E. [UNESP] Menegario, Amauri A. [UNESP] Andrade, Denis V. [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Anderson, Rodolfo C. O. [UNESP] Bovo, Rafael P. [UNESP] Eismann, Carlos E. [UNESP] Menegario, Amauri A. [UNESP] Andrade, Denis V. [UNESP] |
dc.subject.por.fl_str_mv |
amphibians Anura evaporative water loss rehydration water balance |
topic |
amphibians Anura evaporative water loss rehydration water balance |
description |
Because of their permeable skin, terrestrial amphibians are constantly challenged by the potential risk of dehydration. However, some of the physiological consequences associated with dehydration may affect aspects that are themselves relevant to the regulation of water balance. Accordingly, we examined the effects of graded levels of dehydration on the rates of evaporative water loss and water absorption through the skin in the terrestrial Neotropical toad, Rhinella schneideri. Concomitantly, we monitored the effects of dehydration on the mass of visceral organs; hematocrit and hemoglobin content; plasma osmolality; and plasma concentration of urea, sodium, chloride, and potassium. We found that dehydration caused an increase in the concentration of body fluids, as indicated by virtually all the parameters examined. There was a proportional change in the relative masses of visceral organs, except for the liver and kidneys, which exhibited a decrease in their relative masses greater than the whole-body level of dehydration. Changesor the preservationof relative organ masses during dehydration may be explained by organ-specific physiological adjustments in response to the functional stress introduced by the dehydration itself. As dehydration progressed, evaporative water loss diminished and water reabsorption increased. In both cases, the increase in body fluid concentration associated with the dehydration provided the osmotic driver for these changes in water flux. Additionally, dehydration-induced alterations on the cutaneous barrier may also have contributed to the decrease in water flux. Dehydration, therefore, while posing a considerable challenge on the water balance regulation of anurans, paradoxically facilitates water conservation and absorption. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-05-01 2018-11-26T17:24:24Z 2018-11-26T17:24:24Z |
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/10.1086/690189 Physiological And Biochemical Zoology. Chicago: Univ Chicago Press, v. 90, n. 3, p. 313-320, 2017. 1522-2152 http://hdl.handle.net/11449/162674 10.1086/690189 WOS:000398802900002 WOS000398802900002.pdf |
url |
http://dx.doi.org/10.1086/690189 http://hdl.handle.net/11449/162674 |
identifier_str_mv |
Physiological And Biochemical Zoology. Chicago: Univ Chicago Press, v. 90, n. 3, p. 313-320, 2017. 1522-2152 10.1086/690189 WOS:000398802900002 WOS000398802900002.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physiological And Biochemical Zoology 0,904 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
313-320 application/pdf |
dc.publisher.none.fl_str_mv |
Univ Chicago Press |
publisher.none.fl_str_mv |
Univ Chicago Press |
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_ |
1808128651845173248 |