Effects of Season, Temperature, and Body Mass on the Standard Metabolic Rate of Tegu Lizards (<i>Tupinambis merianae</i>)

Toledo, Luı́s Felipe; Brito, Simone P.; Milsom, William K.; Abe, Augusto Shinya; Andrade, Denis V.

doi:10.1086/524147

Cited by 45 publications

(43 citation statements)

References 17 publications

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“…Other studies, however, report that the Q 10 effect does not change with season (for review, see Bennett and Dawson 1976) or that Q 10 even increases during winter at higher temperatures in larger animals (Andrade and Abe 1999). Of particular note is that the effect of temperature on metabolic rate has been reported to be reduced, unchanged, or increased during winter all in the same species, Tupinambis merianae, in different studies (Abe 1983(Abe , 1993(Abe , 1995Andrade and Abe 1999;de Souza et al 2004;Toledo et al 2008).…”

Section: Seasonal Changes In Daily Metabolic Patterns Of Tegu Lizardsmentioning

confidence: 99%

“…The three most southerly occurring species (Tupinambis duseni, Tupinambis rufescens, and T. merianae) belong to one clade that can undergo seasonal dormancy (Köhler and Langerwerf 2000;Manzani and Abe 2002). One of them, T. merianae, has been the subject of a variety of studies that have examined patterns of daily and seasonal change in activity, body temperature, and metabolic rate (Abe 1983(Abe , 1993(Abe , 1995Andrade and Abe 1999;Andrade et al 2004;de Souza et al 2004;Klein et al 2006;Toledo et al 2008).…”

Section: Seasonal Changes In Daily Metabolic Patterns Of Tegu Lizardsmentioning

confidence: 99%

“…Given how little is known about these factors and their interactions, it is not surprising that such wide-ranging changes in oxygen consumption rate have been reported to occur as a function of season in different studies of the same species (Abe 1983(Abe , 1993(Abe , 1995Andrade and Abe 1999;de Souza et al 2004;Toledo et al 2008). In a companion article (Toledo et al 2008), we describe how the standard metabolic rate (SMR) of tegu lizards is affected by changes in body temperature, body mass, and season. In this article, we explore two of the proximate factors involved in inducing metabolic suppression.…”

Section: Seasonal Changes In Daily Metabolic Patterns Of Tegu Lizardsmentioning

confidence: 99%

“…In Tupinambis merianae, the effect of temperature on metabolic rate has been reported to be reduced, unchanged, or increased during winter in different studies, most likely reflecting differences in the size of the animals and the length of the acclimation period (Abe 1983(Abe , 1993(Abe , 1995Andrade and Abe 1999;de Souza et al 2004; for a more detailed discussion, see Toledo et al 2008). In this study, Q 10 values ranged from 1.62 to 3.24 across the seasons, leading to 30%-60% reductions in SMR.…”

Section: Switch From 25њ To 17њcmentioning

confidence: 99%

“…In a recent review, these reductions have been reported to range from 25% to 69% for 11 species of temperate and ) and Andrade and Abe (1999; open circle; mass range 525-n p 12 2,140 g; ) for winter animals only are also included for comn p 6 parison. Note: for comparison, in all cases, the values of oxygen consumption rate have been converted to milliliters O 2 per hour normalized to 1 kg body mass using the scaling equations from Toledo et al (2008). tropical lizards (Christian et al 1999), and our 50%-90% reductions fall within or exceed this range.…”

Section: Is This Metabolic Suppression?mentioning

confidence: 99%

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Seasonal Changes in Daily Metabolic Patterns of Tegu Lizards (Tupinambis merianae) Placed in the Cold (17°C) and Dark

Milsom

Andrade²,

Brito³

et al. 2008

Physiological and Biochemical Zoology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. ABSTRACTOxygen consumption rate was measured continuously in young tegu lizards Tupinambis merianae exposed to 4 d at 25ЊC followed by 7-10 d at 17ЊC in constant dark at five different times of the year. Under these conditions, circadian rhythms in the rate of oxygen consumption persisted for anywhere from 1 d to the entire 2 wk in different individuals in all seasons except the winter. We also saw a progressive decline in standard oxygen consumption rate (at highly variable rates in different individuals) to a very low rate that was seasonally independent (ranging from to mL kg Ϫ1 h Ϫ1 across seasons). 19.1 ‫ע‬ 6.2 27.7 ‫ע‬ 0.2 Although this degree of reduction appeared to take longer to invoke when starting from higher metabolic rates, tegu lizards reduced their metabolism to the low rates seen in winter dormancy at all times of the year when given sufficient time in the cold and dark. In the spring and summer, tegus reduced their standard metabolic rate (SMR) by 80%-90% over the experimental run, but only roughly 20%-30% of the total fall was due to the reduction in temperature; 70%-80% of the total fall occurred at constant temperature. By autumn, when the starting SMR on the first night at 25ЊC was already reduced by 59%-81% (early and late autumn, respectively) from peak summer values, virtually all of the fall (63%-83%) in metabolism was due to the reduction in temperature. This suggests that the temperature-independent reduction of metabolism was already in place by autumn before the tegus had entered winter dormancy.

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Section: Seasonal Changes In Daily Metabolic Patterns Of Tegu Lizardsmentioning

confidence: 99%