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Titolo:
SPECIFIC DYNAMIC ACTION OF A LARGE CARNIVOROUS LIZARD, VARANUS-ALBIGULARIS
Autore:
SECOR SM; PHILLIPS JA;
Indirizzi:
UNIV CALIF LOS ANGELES,SCH MED,DEPT PHYSIOL LOS ANGELES CA 90095 ZOOL SOC SAN DIEGO,CTR REPROD ENDANGERED SPECIES SAN DIEGO CA 92112
Titolo Testata:
Comparative biochemistry and physiology. Section A: Comparative physiology
fascicolo: 4, volume: 117, anno: 1997,
pagine: 515 - 522
SICI:
1095-6433(1997)117:4<515:SDAOAL>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
STANDARD METABOLIC RATES; OXYGEN-CONSUMPTION; TROPICAL AUSTRALIA; PROTEIN-SYNTHESIS; WATER TURNOVER; GAS-EXCHANGE; ENERGETICS; RESPONSES; ENERGY; ROSENBERGI;
Keywords:
DIGESTIVE PHYSIOLOGY; FEEDING ECOLOGY; LIZARD; METABOLISM; REPTILIA; SPECIFIC DYNAMIC ACTION; STANDARD METABOLIC RATE; VARANUS ALBIGULARIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
59
Recensione:
Indirizzi per estratti:
Citazione:
S.M. Secor e J.A. Phillips, "SPECIFIC DYNAMIC ACTION OF A LARGE CARNIVOROUS LIZARD, VARANUS-ALBIGULARIS", Comparative biochemistry and physiology. Section A: Comparative physiology, 117(4), 1997, pp. 515-522

Abstract

Varanus albigularis inhabits grasslands of southern and eastern Africa and experiences months of fasting during the dry season (May-December) followed by voracious feeding during the wet season (January-April). Previous studies have found that sit-and-wait foraging snakes, whichalso experience long intervals between large meals, exhibit unprecedented increases in post-feeding metabolism, which reflects the added cost of up-regulating a previously quiescent gut and digesting a large meal. Hence we measured pre- and post-prandial oxygen consumption rates((V) over dot O-2) of adult V. albigularis in order to observe whether they exhibit similarly large metabolic responses to digestion as sit-and wait foraging snakes. Following the consumption of meals consisting of ground turkey and snails, hard-boiled eggs, or juvenile rats, lizards rapidly increased their ((V) over dot O-2) to peak within 24-27 hr at 7-10 times pre-feeding values (mean = 0.035 mt O-2.g(-1).h(-1). During the 60-90 hr of significantly elevated ((V) over dot O-2), the extra oxygen consumed (the specific dynamic action) represented an energy expenditure of 830-1260 kJ. For meals that were fully digested, specific dynamic action equalled 24% of ingested energy. The magnitudes of V. albigularis post prandial metabolic responses are similar to those previously observed for sit-and-wait foraging snakes. Like sit-and-wait foraging snakes, V. albigularis may also down regulate intestinalperformance during their months of fasting (suggested by their relatively low standard metabolic rate) and then up-regulate their gut (bearing its high energetic cost) upon feeding. (C) 1997 Elsevier Science Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 06:25:02