Estimation of the Metabolic Rate of the Desert Iguana                   (<i>Dipsosaurus dorsalis</i>) by a Radionuclide                Technique

Peters, Eric L.; Ibrahim, Shawki A.; Tracy, C. Richard; Whicker, F.W.; Nagy, Kenneth A.

doi:10.1086/physzool.68.2.30166506

Cited by 31 publications

(26 citation statements)

References 28 publications

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“…Consistent with our expectations for an ectotherm (Lighton, 1996;Komai, 1998;Zhou et al, 2000; Acar et al., 2001;Woodman et al, 2007;Gibbs and Hoshizaki, 2008), DEE increased with increasing T a . Furthermore, consistent with the expectation that 86 Rb k b should increase similarly to V · CO2 (Peters et al, 1995;Peters, 1996; Tomlinson et al., 2013), 86 Rb k b also increased with increasing T a . As there was no difference in the V · CO2 of the beetles on the control diet and the K + experimental diet, it is apparent that additional K + intake had no effect on DEE.…”

Section: Methods and Techniquessupporting

confidence: 88%

“…As V · CO2 was not different between the two groups, presumably the effect was related to K + elimination, independent of the role of K + in what we measured as the metabolic rate (V · CO2 ). (Peters et al, 1995;Peters, 1996;Tomlinson et al, 2013). The results for the control jam diet were not congruent with a previous metaanalysis of 86 Rb k b for ectotherms (Tomlinson et al, 2013) (Fig.…”

contrasting

confidence: 94%

“…intake is altered. Buscarlet et al (Buscarlet et al, 1974) stated that the biological halflife of radioisotopes in insects obeys the same laws as those regulating metabolism, and good correlations between metabolic rate and 86 Rb k b have been reported in vertebrates (Peters et al, 1995;Peters, 1996;Tomlinson et al, 2013). The results for the control jam diet were not congruent with a previous metaanalysis of 86 Rb k b for ectotherms (Tomlinson et al, 2013) (Fig.…”

Section: Methods and Techniquesmentioning

confidence: 78%

“…Although the DLW method has broad support and application for measuring FMR, the technique has theoretical and practical limits, where some species and habitats are not suitable for the technique (for review, see Tomlinson et al, 2013). The biological turnover of radioactive 86 Rb has been proposed as an alternative that avoids some of the limitations of DLW, and may be applicable to taxa that are unsuitable for DLW (Peters et al, 1995;Peters, 1996;Tomlinson et al, 2013). A problem with using 86 Rb k b as a measure of an animal's metabolism is a lack of understanding of the mechanistic link between metabolism and the turnover of 86 Rb (Bradshaw and Bradshaw, 2007;Tomlinson et al, 2013 86 Rb k b and DEE to make it ecologically relevant as a measure of FMR.…”

Section: Resultsmentioning

confidence: 99%

“…It has now been fairly well established that the turnover of rubidium-86 ( 86 Rb), a gamma and beta radio-emitter, correlates well with metabolic rate in vertebrates (Mishima and Odum, 1963;Fairbanks and Burch, 1968;Baker and Dunaway, 1975;Williamson, 1975;Peters et al, 1995;Peters, 1996;Tomlinson et al, 2013), and that there are some general patterns to this relationship that span all of the taxa studied so far (Tomlinson et al, 2013). Radio-isotope enrichment, particularly of gamma emitters, can be measured by whole-body counting, obviating the need for sub-sampling of the body pool .…”

Section: Introductionmentioning

confidence: 99%

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Special K: testing the potassium link between radioactive rubidium (86Rb) turnover and metabolic rate

Tomlinson

Mathialagan

Maloney

2013

Journal of Experimental Biology

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The measurement of 86 Rb turnover recently has been suggested as a useful method for measuring field metabolic rate in small animals. We investigated a proposed mechanism of Rb in the beetles on the K + and the Rb + diets was higher than that for beetles on the jam diet (F 2,311 =32.4; P=1.58×10 −13 ). We also exposed the beetles to different ambient temperatures to induce differences in metabolic rate (V · CO 2 ) while feeding them the jam and K + diets. V · CO 2 was higher at higher ambient temperature (T a ) for both jam (F 1,11 INTRODUCTIONThe metabolic rate of an animal is a measure of that animal's energy expenditure and reflects the cost of living (Hulbert and Else, 2004). The basal metabolic rate (BMR) is generally used to compare the metabolic rate of endotherms to each other, being the metabolic rate measured under defined conditions when an animal is inactive, postabsorptive and non-reproductive within the thermoneutral zone (Ricklefs et al., 1996;McNab, 1997). The standard metabolic rate (SMR) is measured under less stringent conditions when an animal is at rest, and is broadly considered to represent the minimal cost of living (Hulbert and Else, 2004). In insects there is no definition for BMR, and the SMR is usually used for comparative purposes (Quinlan and Gibbs, 2006). Metabolic rate can be readily measured in the laboratory by direct calorimetry, which involves measuring the heat produced by an animal (Kleiber, 1961;McLean and Tobin, 1987). More commonly used is indirect calorimetry, including flowthrough respirometry, which measures the gas metabolism of an animal (either oxygen consumption, V · O2 , or carbon dioxide production, V · CO2 , or both) and is recognised as one of the easiest and most accurate approaches to the measurement of metabolism (Frappell, 2006). These are often used as proxies for true calorimetric representations of energy expenditure by virtue of relatively straightforward conversions to calorimetry, providing the respiratory exchange ratio (RER) or respiratory quotient (RQ) is known. METHODS & TECHNIQUESWhile laboratory measures of metabolic rate are informative in a comparative context (Brody and Procter, 1932;Kleiber, 1932;Elgar and Harvey, 1987;McNab, 1997), it is often difficult to extrapolate these measurements under controlled conditions to the cost of living in dynamic ecological scenarios. The utility of extrapolating metabolic rate data from captive animals to free-living animals has been questioned, especially when the latter experience different conditions such as food supply, quality of life and weather compared with laboratory conditions (Nagy, 1987). In contrast, the field metabolic rate (FMR) is measured in animals that are free-ranging in their natural environment (Ricklefs et al., 1996) and reflects the summary cost of living for that animal in its natural environment. The FMR includes the costs of BMR, SMR, thermoregulation, locomotion, feeding, predation avoidance, alertness, posture and digestion (Nagy, 1987). As FMR is measured over se...

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