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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Prates, Ivan [1] ; Navas, Carlos A. [2]
Total Authors: 2
Affiliation:
[1] Inst Butantan, Lab Biol Celular, BR-05503900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Dept Fisiol, Inst Biociencias, BR-05503900 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Copeia; n. 3, p. 618-622, SEP 3 2009.
Web of Science Citations: 20
Abstract

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)

FAPESP's process: 03/01577-8 - Causes and correlations of physiological variation: role of environmental and behavioral gradients at different levels of organization
Grantee:Carlos Arturo Navas Iannini
Support type: Research Projects - Thematic Grants
FAPESP's process: 06/52491-4 - Hydroregulation in Bufo (Anura: Bufonidae): physiological and behavioral aspects of Caatinga and Mata Atlantica species
Grantee:Ivan Prates
Support type: Scholarships in Brazil - Scientific Initiation