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Universidade de Sao Paulo (2016)

Estratégias fisiológicas e comportamentais em anuros no semiárido : implicações sobre o balanço energético e hídrico

Pereira, Isabel Cristina

Titre : Estratégias fisiológicas e comportamentais em anuros no semiárido : implicações sobre o balanço energético e hídrico

Physiological and behavioral strategies in frogs in the semiarid : implications on the energy and water balance

Auteur : Pereira, Isabel Cristina

Université de soutenance : Universidade de Sao Paulo

Grade : Doutorado 2016

Résumé
Estivation is defined as a set of physiological and behavioral changes associated to decreased metabolism and permanence in specific microhabitats during the dry season. In the Brazilian Caatinga was observed at least three estivating species : Pleurodema diplolistris and Physalaemus albifrons (Leiuperidae) and Proceratophrys cristiceps (Cycloramphidae). Although found in the same micro-habitat during aestivation, these three species differ in the variation patterns of locomotor performance when compared between the two seasons (dry and rainy season). During the dry phase, speed in P. diplolistris is reduced by about 47% whereas in P. cristiceps and P. albifrons values decrease by 87% and 83%, respectively. Moreover, only P. diplolistris exhibited changes of depth along the drought. The reduction of aerobic metabolic rate was of approximately 50% for the three species. The comparison between seasons also revealed that the three species differ in relation to the variation patterns of the concentration of substrate energy and activity of representative enzymes of energy metabolism in the liver and muscles of the hindlimb. The water maintenance was also different among the three species, indicating the occurrence of several strategies of hidric regulation

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