Seasonal metabolic changes in a year-round reproductively active subtropical tree-frog (Hypsiboas prasinus)

Autor(es)

Kiss, Ana Carolina I. ^[1] ; de Carvalho, Jose Eduardo ^[2] ; Navas, Carlos A. ^[3] ; Gomes, Fernando R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Fisiol, Inst Biociencias, BR-18618000 Botucatu, SP - Brazil

^[2] Univ Fed Sao Paulo, Dept Ciencias Biol, BR-09972270 Diadema, SP - Brazil

^[3] Univ Sao Paulo, Dept Fisiol, Inst Biociencias, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY; v. 152, n. 2, p. 182-188, FEB 2009.
• Citações Web of Science: 14

Resumo

Although seasonal metabolic variation in ectothermic tetrapods has been investigated primarily in the context of species showing some level of metabolic depression during winter, but several species of anurans maintain their activity patterns throughout the year in tropical and subtropical areas. The tree-frog Hypsiboas prasinus occurs in the subtropical Atlantic Forest and remains reproductively active during winter, at temperatures below 10 degrees C. We compared males calling in summer and winter, and found that males of H. prasinus exhibit seasonal adjustments in metabolic and morphometric variables. Individuals calling during winter were larger and showed higher resting metabolic rates than those calling during summer. Calling rates were not affected by season. Winter animals showed lower liver and heart activity level of citrate synthase (CS), partially compensated by larger liver mass. Winter individuals also showed higher activity Of pyruvate kinase (PK) and lower activity of CS in trunk muscles, and higher activity of CS in leg muscles. Winter metabolic adjustments seem to be achieved by both compensatory mechanisms to the lower environmental temperature and a seasonally oriented aerobic depression of several organs. The impact of seasonal metabolic changes on calling performance and the capacity of subtropical anurans for metabolic thermal acclimatization are also discussed. (C) 2008 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 04/05469-8 - Alterações nas capacidades metabólicas energéticas em ectotermos: um estudo sobre os efeitos da digestão de presas em serpentes
• Beneficiário: José Eduardo de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• 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
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 06/54699-1 - Fragmentação das florestas, distribuição geográfica e evolução fisiológica em anuros neotropicais
• Beneficiário: Fernando Ribeiro Gomes
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores