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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Dehydration as a stressor in toads (Rhinella ornata)

Texto completo
Autor(es):
Giorgi Barsotti, Adriana Maria [1] ; Titon Junior, Braz [1] ; Monteiro Titon, Stefanny Christie [1] ; Gomes, Fernando Ribeiro [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Biociencias, Dept Fisiol, Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF EXPERIMENTAL ZOOLOGY PART A-ECOLOGICAL AND INTEGRATIVE PHYSIOLOGY; v. 331, n. 3, p. 168-174, MAR 2019.
Citações Web of Science: 0
Resumo

Availability of a humid environment is essential for amphibians to carry out their activities and most species are characterized by low resistance to evaporative water loss. Moreover, dehydration severely compromises amphibian locomotor and foraging performance, representing a relevant selective factor modulating the evolution of its integrative phenotype. In this way, we hypothesized that dehydration is a stressor for toads, inducing a stress response comparable to that elicited by another commonly used stress protocol: restraint challenge. We evaluated changes in plasma levels of corticosterone (CORT), hematocrit (Hct), and neutrophil:lymphocyte (N:L) ratio in adult males of Rhinella ornata, experimentally submitted to different levels of hydration (100%, 90%, and 80% of standard body mass) and to restraint challenge. Our results showed that dehydrating toads by 10% increase CORT to levels equivalent to that obtained by restraint. Moreover, toads dehydrated by 20% show a more pronounced increase in CORT, along with increased Hct and N:L ratio. In this way, we corroborated the hypothesis that dehydration triggers a pronounced stress response in R. ornata. Highlights Dehydration can elicit a stress response in toads, by increasing corticosterone plasma levels and neutrophil:lymphocyte ratio. Corticosterone plasma levels were higher in individuals 20% dehydrated than in subjects submitted to restriction of movement, showing that dehydration may offer high intensity stress. (AU)

Processo FAPESP: 13/00900-1 - Estudo comparativo das relações entre imunocompetência e níveis plasmáticos de esteróides inter-renais e gonadais em sapos
Beneficiário:Fernando Ribeiro Gomes
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 16/05024-3 - Estresse hídrico e resposta imune em sapos (Rhinella ornata) habitando fragmentos de Floresta Atlântica
Beneficiário:Adriana Maria Giorgi Barsotti
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 14/16320-7 - Impactos das mudanças climáticas e ambientais sobre a fauna: uma abordagem integrativa
Beneficiário:Carlos Arturo Navas Iannini
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático