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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.)

Cutaneous Resistance to Evaporative Water Loss in Brazilian Rhinella (Anura: Bufonidae) from Contrasting Environments

Texto completo
Autor(es):
Prates, Ivan [1] ; Navas, Carlos A. [2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Inst Butantan, Lab Biol Celular, BR-05503900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Dept Fisiol, Inst Biociencias, BR-05503900 Sao Paulo - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Copeia; n. 3, p. 618-622, SEP 3 2009.
Citações Web of Science: 19
Resumo

Influenced by taxonomic position. For example, bufonids are regarded as exhibiting a permeable skin that seems typical for terrestrial anurans. However, this assumption is supported by information on only four bufonid species; therefore, the enormous ecological diversity of the family remains poorly Investigated. To assess whether variation in R(s) within related bufonids correlates with environmental aridity, we measured area-specific rates of EWL of two Brazilian populations of Rhinella granulosa (previously Bufo granulosus), one from the Atlantic Forest and other from the semi-arid Caatinga, and compared both with the forest species R. ornato. Rhinella granulosa from the Atlantic Forest had higher cutaneous resistance than conspecifics from Caatinga and R. ornata. Rhinella ornato presented the lowest cutaneous resistance values. However, Rs were very close to zero In all three populations. We conclude that enhanced Rs is not part of the suite of traits allowing R. granulosa to exploit the Caatinga, and that variation in R(s) within bufonids may relate to traits other than water conservation. Some Information on microhabitat occupation and ventral skin morphology supports the idea that exceptional abilities for detecting and taking up water may be the key factors enhancing the survival of R. granulosa, and possibly other bufonids, in xeric environments. (AU)

Processo FAPESP: 03/01577-8 - Causas e correlações da variação fisiológica: papel dos gradientes ambientais e comportamentais em diferentes níveis de organização
Beneficiário:Carlos Arturo Navas Iannini
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 06/52491-4 - Relações hídricas em Bufo (Anura: Bufonidae): participação de aspectos fisiológicos e comportamentais em espécies de Caatinga e Mata Atlântica
Beneficiário:Ivan Prates
Linha de fomento: Bolsas no Brasil - Iniciação Científica