Topic 7- Energy Budgets Flashcards
What is an advantage of large animals having a small surface area to volume ratio?
it allows them to lose heat more efficiently, makes temperature regulation easier.
What is the relationship between Metabolic Rate and Animal Body Mass?
As body mass increases, metabolic rate increases
which has a larger metabolic demand, smaller or larger animals?
Smaller animals have larger metabolic demands
what is hyperallometry (positive allometry)?
as one dimension increases, another increases with a greater proportion.
what is hypoallometry (negative allometry)?
as one dimension increases, another increases to a lesser proportion.
What is Eassimilation?
the energy available to the organism, Ein-Eexcretion.
Can Eassimilation be negative?
Yes, if Eassimilation is positive the energy can be used towards Eproduction (growth and reproduction), if Eassimilation is negative more energy is being used than produced.
If a cat weighs 20 kg and eats 20% of its body mass in food that gives 200J/g of energy. What is Ein?
Mass x 0.20 x amount of energy from food
=20 000g x 0.20 x 200 J/g
=800 000J
=800 kJ
if a 20 kg cat excretes 50g of urea and 200g of feces, the urea is 10J/g of energy and the feces is 250J/g of energy, what is Eexcretion?
grams of urea x energy of urea + grams of feces x energy of feces
=(50g x 10J/g) + (200g x 250J/g)
=50 500 J
=50.5 kJ
if you have a 20 kg cat, with an energy input of 800 kJ and an energy output of 50.5kJ, what is Eassimilation? What happens with this value?
Eassimilation= Ein-Eexcretion
= 800- 50.5
=749.5 kJ
This cat would be able to put energy towards growth or reproduction.
what is resting metabolic rate?
an organisms metabolic rate at rest, including daily activites
what is basal metabolic rate?
metabolic rate at absolute rest, lowest possible metabolic rate
what is standard metabolic rate?
metabolic rate at specific temperatures, only used for ectotherms
what is metabolic rate used for?
1.helps determine how much food an organism needs
2. gives a quantitative measurement of total activity
3.helps determine pressure on an ecosystems energy supplies
what is an ectotherm?
ectotherms rely on external environment for temperature regulation.