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denis23
25 days ago
7

Suppose a fox in a food web feeds only on rabbits, squirrels, mice and birds, all of which feed exclusively on plant material. A

ssuming that a fox’s daily caloric requirement is 800 kcal, and that only 10 percent of the energy at one trophic level can be passed to the next trophic level. How many square meters of plant material are required to support the fox, if the net primary productivity of the plant material is 8,000 kcal/m2/yr? Hint: draw the food chain to determine how many kcal/m2/yr the fox receives to determine how much land he needs and remember the 10% rule!
Advanced Placement (AP)
1 answer:
pickupchik [329]25 days ago
7 0

Response:

area of plant materials necessary for the fox's sustenance = 3650 m²

Clarification:

Based on the provided details:

the daily energy need of the fox = 800

Over the course of a year, this equates to = 800 kcal × 365 /year = 292,000 kcal/year

Moreover, only 10% of energy from one trophic level is transferred to the next.

the effective productivity of the plant material = 8000 kcal/m²/yr

Consequently, with 10% energy transfer, the fox requires only 80 kcal/m²/yr

The aim is to calculate in square meters, the amount of material needed to sustain the fox.

area of plant materials necessary for the fox's sustenance = \dfrac{292,000}{80}

= 3650 m²

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