Field Energetics and Food Consumption of the Galápagos Marine Iguana, Amblyrhynchus cristatus

@article{Nagy1984FieldEA,
  title={Field Energetics and Food Consumption of the Gal{\'a}pagos Marine Iguana, Amblyrhynchus cristatus},
  author={Kenneth A. Nagy and Vaughan H. Shoemaker},
  journal={Physiological Zoology},
  year={1984},
  volume={57},
  pages={281 - 290}
}
Metabolic rates (doubly labeled water), daily time budgets, and feeding rates were determined for free-ranging marine iguanas on Isla Fernandina, Galápagos. Field metabolic rates were related to body mass according to the equation kJ/day = 0.079 g0.97 for all sizes of lizards, and kJ/day = 0.64 g0.68 for adults only. Hatchlings had surprisingly low field metabolic rates. The daily energy expenditure of a representative 1-kg adult (70.3 kJ/day) was 1.7 times resting metabolism. Metabolic cost of… 
Ontogenetic changes in food intake and digestion rate of the herbivorous marine iguana (Amblyrhynchus cristatus, Bell)
TLDR
Maintenance of high body temperature enabled hatchlings to achieve high digestion rates and, combined with high relative intake, thus achieve sufficient energy intake for rapid growth despite higher mass specific metabolic rates.
Effects of foraging mode and season on the energetics of the Marine Iguana, Amblyrhynchus cristatus
TLDR
The water flux of the Marine Iguana increases with increasing foraging time, and the linear rise per minute foraging is roughly two times as high for subtidally foraging animals as for intertidal foragers.
Energy Utilization by Free-Ranging Jackass Penguins, Spheniscus Demersus
TLDR
Rates of CO2 production by breeding Jackass Penguins (mean mass, 3170 g) were measured by using doubly labeled water and foraging efficiency (the metabolizable energy gained while foraging . the energy used during foraging) was 2.1 for birds with small chicks.
Osmoregulation in the Galápagos Marine Iguana, Amblyrhynchus cristatus
TLDR
Water fluxes were measured isotopically for free-ranging marine iguanas on Isla Fernandina, Galápagos to maintain weight regulated plasma Na⁺, whereas plasma K⁺ declined, and plasma electrolyte concentrations are high in field animals and decline when the animals are held without food or water.
Seasonal metabolism of a small, arboreal monitor lizard, Varanus scalaris, in tropical Australia
TLDR
The field metabolic rates (FMR) and water fluxes of Varanus scalaris were measured during the wet and dry seasons by the doubly-labelled water technique, and measurements of SMR and RMR were significantly higher in the wet season, but there was no difference in the maximal oxygen consumption between seasons.
Niche expansion, body size, and survival in Galápagos marine iguanas
TLDR
It is hypothesized that Batis feeding developed as a local foraging tradition, and that dietary conservatism and strong foraging site fidelity explain why the inclusion of land plants in the diet has been observed in only a single population of iguanas.
Ethogram of Immature Green Turtles: Behavioral Strategies for Somatic Growth in Large Marine Herbivores
TLDR
This work investigated fine-scale behavioral patterns (feeding, resting and other behaviors), microhabitat use and time spent on each behavior for eight immature green turtles using data loggers including: depth, global positioning system, head acceleration, speed and video sensors.
ENERGY BUDGETS IN FREE-LIVING GREEN IGUANAS IN A SEASONAL ENVIRONMENT
TLDR
Body condition of males decreased during the mating period (March/April), while most of the decrease in body condition of females occurred during the time of oviposition (May/June).
Energetics and Water Flux in a Semiaquatic Lizard, Varanus mertensi
TLDR
Varanus mertensi does differ from terrestrial varanid lizards living in the same area during their active seasons in not having an inactive period during the dry season, and it is suggested that this is related to the continual availability of food and water in its habitat.
Energy and Water Turnover in Two Tropical Varanid Lizards, Varanus bengalensis and V. salvator
TLDR
The water fluxes and metabolic rates of both species are substantially higher than in varanids from semiarid and arid habitats, and are higher than predicted for other tropical reptiles.
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 31 REFERENCES
Field Energetics and Foraging Mode of Kalahari Lacertid Lizards
TLDR
The widely foraging lizard Eremias lugubris made a greater profit on its investment, and the wide forager grew nearly twice as fast as did the sit-and-wait predator during this study.
Energy Utilization by Free‐Ranging Sceloporus Virgatus Lizards
TLDR
Field behavior patterns are consistent with the hypothesis that these lizards regulate their activity in a manner that enhances survival and reproduction, and can change its daily cost of living by nearly an order of magnitude by varying the time it spends abroad.
Energy Expenditure in Free-Ranging Lizards
TLDR
Daily field metabolism of the western fence lizard Sceloporus occidentalis is only 3 to 4% that of a bird or mammal of equal size, which is not different from those of Y Y in spring or fall.
Metabolic Expenditure and the Cost of Foraging in the Lizard Cnemidophorus murinus
TLDR
The ability of this lizard to sustain aerobic activity is limited, but foraging activity is restricted within these aerobically supportable limits.
Osmoregulation in the Galápagos Marine Iguana, Amblyrhynchus cristatus
TLDR
Water fluxes were measured isotopically for free-ranging marine iguanas on Isla Fernandina, Galápagos to maintain weight regulated plasma Na⁺, whereas plasma K⁺ declined, and plasma electrolyte concentrations are high in field animals and decline when the animals are held without food or water.
Foraging and Transport Costs in the Galapagos Marine Iguana, Amblyrhynchus cristatus
  • T. Gleeson
  • Biology, Environmental Science
    Physiological Zoology
  • 1979
TLDR
Passive reduction of body temperature while in water, coupled with increased speeds attainable by swimming, function to reduce both time and energy spent foraging.
Energy and Nitrogen Budgets of the Free-Living Desert Lizard Sauromalus obesus
TLDR
Animals lost weight during the year, apparently because succulent vegetation was unavailable after May, and most animals stopped feeding and reduced their activity in June and this estivation apparently prevented even greater weight losses than those observed.
Energy Expenditure of a Large Herbivorous Lizard
TLDR
It is suggested that the paucity of large carnivorous lizards results from the prohibitive costs of gathering vertebrate prey.
Lizard Energetics and Diet
TLDR
It is postulated that larger animals of these families are unable to get caloric demands on a diet of insects, have no practical alternative animal prey, and rely instead on vegetation.
Interhabitat differences in energy acquisition and expenditure in a lizard
TLDR
Body size, daily energy expenditure, DEE, and feeding rate of woodland lizards can be explained by their longer daily activity period, and implications of length of daily foraging period for adult body, size, population density, and various life history parameters of lizards are discussed.
...
1
2
3
4
...