Energy Expenditure in Free‐Ranging Lizards

Bennett, Albert A.; Nagy, Kenneth A.

doi:10.2307/1939022

Cited by 121 publications

(60 citation statements)

References 11 publications

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“…This cost may involve some combination of the energy expended to climb plants (e.g. Bennett and Nagy 1977) and a greater risk of predation on open canopies (e.g. Schwarzkopf and Shine 1992).…”

Section: Reproductive Characteristicsmentioning

confidence: 99%

An experimental study of the effects of weed invasion on lizard phenotypes

Downes

Hoefer

2007

Oecologia

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We examined how a weed affected the basking and activity of a diurnal lizard, and the potential cascading effects of these shifts for life history strategies and expression of morphology. Hatchlings of the diurnal lizard Lampropholis delicata were raised to maturity in outdoor enclosures that mimicked high, moderate and low invasion by a sprawling plant (blue periwinkle, Vinca major). Skinks depend on sunlight for growth and maintenance. Periwinkle differs from displaced grassland by being structurally complex and blocking sunlight. Lizards restricted to the enclosure floor achieved preferred body temperatures only when exposure to periwinkle was moderate or low. However, lizards in high invasion enclosures could reach preferred body temperatures by climbing plants and basking on exposed canopy. This shift in basking strategy resulted in lizards growing longer hind limbs compared with animals that rarely (moderate invasion) and never (low invasion) climbed plants. Consequently, lizards reared in high invasion enclosures sprinted faster than conspecifics reared in lower invasion environments. Throughout the study there was no significant variation among treatments in the tendency of animals to be moving when they were not hidden. However, lizards in high invasion treatments hid more often during the day, were lighter in body mass, and females had lighter clutch masses and offspring than did those from moderate and low invasion enclosures. Thus, microhabitat degradation can drive a cascade of changes to an animal's ecology.

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Section: Reproductive Characteristicsmentioning

confidence: 99%

An experimental study of the effects of weed invasion on lizard phenotypes

Downes

Hoefer

2007

Oecologia

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“…Thus, depending on environmental temperature, an endotherm expends a great deal of energy for thermoregulation alone, an amount that has been estimated to be as high as 80 to 90 percent of total energy intake of a rodent active under natural conditions (7). In animals active in nature, the size of the metabolic differential between a behaviorally thermoregulating lizard and a mammal or bird of the same size is 20-to 30-fold or more (8).…”

Section: Speciesmentioning

confidence: 99%

Endothermy and Activity in Vertebrates

Bennett¹,

Ruben²

1979

Science

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630

492

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Resting and maximal levels of oxygen consumption of endothermic vertebrates exceed those of ectotherms by an average of five- to tenfold. Endotherms have a much broader range of activity that can be sustained by this augmented aerobic metabolism. Ectotherms are more reliant upon, and limited by, anaerobic metabolism during activity. A principal factor in the evolution of endothermy was the increase in aerobic capacities to support sustained activity.

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“…DLW measures the subject's carbon dioxide production by monitoring relative changes in stable isotopes of oxygen and hydrogen (Speakman 1998). DLW can be used for air breathers, including mammals (Nagy 2005), reptiles (Bennett & Nagy 1977) and birds (Masman et al 1988, Shaffer et al 2001, Mullers et al 2009), but not for fish, because the high water flux across the gills and the low metabolic rate result in only slight changes in the divergence of isotope concentrations (Speakman 1997). In contrast, f H has been shown to provide a reasonably useful estimate of metabolic rate in large (>1 kg) teleosts (Clark et al 2005, Casselman et al 2012, although limitations include high equipment costs, poor reliability ) and variable relationships between f H and oxygen consumption (Thorarensen et al 2005, Iversen et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Estimating activity-specific energy expenditure in a teleost fish, using accelerometer loggers

Wright¹,

Metcalfe²,

Hetherington³

et al. 2014

Mar. Ecol. Prog. Ser.

107

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The ability to define and quantify the behaviour and energetic costs of different activities is fundamental to a full understanding of fish ecology and movement, but monitoring activity and measuring energy expenditure in fish in the field is problematic. New telemetry methods using data loggers that incorporate tri-axial accelerometers promise to provide a method for simultaneously recording the behaviour and activity-specific energy use in both the laboratory and field. Using electronic data loggers equipped with tri-axial accelerometers we have measured dynamic body acceleration (DBA) during aerobic exercise in European sea bass Dicentrarchus labrax whilst swimming in a swim-tunnel respirometer at ambient water temperatures of between 5.5 and 17.5°C. For all individuals, dynamic body acceleration (both vectorial dynamic body acceleration [VeDBA] and overall dynamic body acceleration [ODBA]) scaled linearly with oxygen consumption and as a function of ambient temperature. When the 2 DBA metrics were compared, VeDBA was not significantly different from ODBA, though the value for Akaike's information criterion was lower for VeDBA (indicating a better fit for the VeDBA model). In this paper, we provide further evidence to support the use of acceleration as a means to quantify the activity-specific energetic costs of swimming in teleosts and highlight some of the problems associated with monitoring the activity and metabolic rate of fish in restricted laboratory conditions.

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Energy Expenditure in Free‐Ranging Lizards

Cited by 121 publications

References 11 publications

An experimental study of the effects of weed invasion on lizard phenotypes

An experimental study of the effects of weed invasion on lizard phenotypes

Endothermy and Activity in Vertebrates

Estimating activity-specific energy expenditure in a teleost fish, using accelerometer loggers

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