Question

for the top carnivore level (barn owl) review the explore paragraph at the beginning of the lab to find the mass of the barn owl. for the herbivore level use the total mass of prey in year (kg). for the producer level, use the total biomass eaten (kg). label all levels with their trophic level and any applicable vocabulary. begin ass
elaborate:

1. calculate how much energy is lost going from the 1st and 2nd trophic level. use percent change to calculate. to find percent change = ((starting amount - ending amount)/starting amount) × 100. show your work!
2. how much energy is lost from the 2nd to the 3rd trophic level?
3. your textbook says 90% of the energy is lost as you go up a trophic level. are your results close to 90%? why or why not? what can you infer?
4. according to the 1st law of thermodynamics, energy is never lost, it just changes form. we say that energy is \lost\ as you go up a trophic level, but it doesnt just disappear. explain what could happen to the energy that is \lost\ in your own words. (hint: look up the 2nd law of thermodynamics!)

Explanation:

Step1: Identify values for 2nd - 3rd trophic level

Starting amount (2nd trophic level biomass) = \(41.06\) kg, ending amount (3rd trophic level biomass) = \(0.8\) kg.

Step2: Apply percent - change formula

Percent change formula: \(\text{Percent Change}=\frac{\text{Starting Amount}-\text{Ending Amount}}{\text{Starting Amount}}\times100\).
Substitute values: \(\frac{41.06 - 0.8}{41.06}\times100=\frac{40.26}{41.06}\times100\approx98.05\%\)

Answer:

Approximately \(98.05\%\) of energy is lost from the \(2^{nd}\) to the \(3^{rd}\) trophic level.