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Energy Budgets00:51

Energy Budgets

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Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
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Production Efficiency01:01

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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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A complete procedure of testing a hypothesis about a population mean when the population standard deviation is unknown is explained here.
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used;...
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DINOSAURS FOR GROWN-UPS.

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Diet selection and digestion in Iguana iguana: the importance of age and nutrient requirements.

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Related Experiment Video

Updated: Mar 6, 2026

Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs
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Posthatching yolk energy in a lizard: utilization pattern and interclutch variation.

Katherine Troyer1,2

  • 1Department of Zoology, University of California, 95616, Davis, CA, USA.

Oecologia
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Newly hatched green iguanas rely on yolk reserves for crucial early-life energy. This yolk provisioning significantly influences juvenile growth and posthatching survival in reptiles.

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Area of Science:

  • Herpetology
  • Developmental Biology
  • Ecology

Background:

  • Newly hatched green iguanas (Iguana iguana) possess a significant yolk mass.
  • This yolk mass is comparable in size and caloric content to that of loggerhead turtles and birds.

Purpose of the Study:

  • To investigate the role of yolk mass as an energy supplement for newly hatched green iguanas.
  • To explore the relationship between yolk provisioning, maternal investment, and offspring success.

Main Methods:

  • Analysis of yolk mass relative size and caloric content in newly hatched green iguanas.
  • Examination of lipid:protein ratios during yolk depletion.
  • Comparison of interclutch variation in yolk size with body mass and length.

Main Results:

  • Iguana yolk mass constitutes 13.6% of body mass with a caloric content of 6.87 kcal/g DM.
  • The lipid:protein ratio remains constant during yolk depletion, indicating simultaneous nutrient utilization.
  • Interclutch variation in yolk size exceeds that of body mass or length, suggesting maternal nutrient availability influences provisioning.

Conclusions:

  • Yolk mass is vital for green iguana survival during their first month, supporting critical activities before their digestive system matures.
  • Increased maternal investment in yolk size may enhance offspring growth rates and activity levels.
  • Selection favors maximization of juvenile growth rate and body size at hatching, with yolk provisioning playing a key role.