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Universidad Sao Polo (2009)

Aspectos fisiológicos e ecológicos da estivação em Pleurodema diplolistris (Leiuperidae/Anura)

Pereira Isabel Cristina

Titre : Aspectos fisiológicos e ecológicos da estivação em Pleurodema diplolistris (Leiuperidae/Anura)

Physiological and ecololgical aspects of aestivation in Pleurodema diplolistris (Leiuperidae/Anura)

Auteur : Pereira Isabel Cristina

Université de soutenance : Universidad Sao Polo

Grade : Mestrado 2009

Résumé
Caatinga is a Brazilian semi-arid bioma that is characterized by the dryness and the unpredictable seasonality of rains. In some anurans the survive is associate with aestivation, a set of strategies for survival in arid conditions. Pleurodema diplolistris frogs (Leiuperidae/Anura) are found buried in the Caatinga during the dry time. Evidences indicate that individuals of this group have lower activity during this phase, although some exhibit vertical migration in the substrate following the decrease in the moisture of it. The pattern of changes in concentrations of lipids and glycogen in different samples of tissue supports the hypothesis of a reduction of metabolism during the drought. In the muscle of the hindquarters, the maintenance of protein levels close to those values observed in active animals collected during the rainy season, suggests the preservation of functional capacity of the tissue even in most adverse months. The aerobic capacity was reduced during the drought compared to the period of anaerobic glycolytic activity and the capacity has remained preserved. It was also found a gradient of moisture under the vertical, showing a decrease in moisture from the surface, during the drought, which could corroborate the vertical migration.

Mots clés  : Aestivation ; Anfíbios anuros ; Anuran Amphibians ; Energy metabolism ; Estivação ; Metabolismo energético ; Fisiologia Geral

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Page publiée le 31 décembre 2015, mise à jour le 31 mars 2019