The consequences of seasonal fasting during the dormancy of tegu lizards (Salvator merianae) on their postprandial metabolic response
| Autor: | Rodrigo Samuel Bueno Gavira, Bruna F. Gomes, Augusto Shinya Abe, Manuel N. Gontero-Fourcade, Marina R. Sartori, Denis V. Andrade |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), Consejo Invest Cient & Tecn |
| Rok vydání: | 2018 |
| Předmět: |
030110 physiology
0301 basic medicine Specific dynamic action Physiology Tegu Aquatic Science Biology 03 medical and health sciences chemistry.chemical_compound Animal science Gastrointestinal tract Blood metabolites Dormancy effects Molecular Biology Ecology Evolution Behavior and Systematics Meal Triglyceride Metabolism Postprandial chemistry Insect Science Dormancy Uric acid Animal Science and Zoology Atrophy Digestion |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 1477-9145 0022-0949 1350-6900 |
| Popis: | Made available in DSpace on 2018-11-26T17:54:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-04-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) National Council Scientific Technical Research (Consejo Nacional de Investigaciones Cientificas y Tecnicas, CONICET) Tegu lizards (Salvator merianae) aestivate for up to 5 months during Brazil's winter, when they retreat to burrows and halt most activities. Dormant tegus reduce their gastrointestinal (GI) mass, which allows a substantial energy economy. This strategy, however, implies that the first post-dormancy digestion would be more costly than subsequent feeding episodes as a result of GI atrophy. To address this, we determined the postprandial metabolic response (SDA) of the first (M1), second (M2) and several (RM) feeding episodes after tegus' dormancy. Another group of tegus (PF) was subjected to an extra 50 day fasting period after arousal. Glucose, triglycerides and uric acid levels were checked before and after feeding. M1 digestion lasted twice as long and cost twofold more when compared with M2 or RM, in agreement with the idea that GI atrophy inflates digestion cost at the first post-dormancy meal. The SDA response was similar in M2 and RM, suggesting that the GI tract was fully reorganized after the first feeding. The SDA cost was equal in PF and RM, implying that the change in state per se (dormant to arousal) triggers the regrowth of GI, independently of feeding. Fasting tegus at M1 presented higher triglyceride and lower uric acid levels than fed tegus, indicating that fasting is mainly sustained by fat storage. Our results show that seasonal fasting imposes an extra digestion cost to tegus following their next feeding, which is fully paid during their first digestion. This surplus cost, however, is negligible compared with the overall energetic savings from GI tract atrophy during the dormancy period. Univ Estadual Paulista, Inst Biociencias, Dept Zool, BR-13506900 Rio Claro, SP, Brazil Consejo Invest Cient & Tecn, Inst Multidisciplinario Invest Biol San Luis, RA-5700 San Luis, Argentina Univ Estadual Paulista, Inst Biociencias, Dept Ecol, BR-13506900 Rio Claro, SP, Brazil Univ Estadual Paulista, Inst Biociencias, Dept Zool, BR-13506900 Rio Claro, SP, Brazil Univ Estadual Paulista, Inst Biociencias, Dept Ecol, BR-13506900 Rio Claro, SP, Brazil FAPESP: 12/15697-4 FAPESP: 12/16537-0 FAPESP: 13/04190-9 FAPESP: 11/09647-1 CNPq: 306811/2015-4 CNPq: 08/57712-4 |
| Databáze: | OpenAIRE |
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