Responses to the Environment

AP Biology· difficulty 4/5

The marginal value theorem of optimal foraging predicts a forager's patch-leaving time.

According to the marginal value theorem, the forager should leave the patch when:

A
$The instantaneous intake rate equals the average for the habitat$
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B
$The patch is completely empty$
C
$Energy gained exceeds total cost$
D
$The forager has eaten for the same time as another competitor$

Explanation

MVT predicts patch departure when marginal intake rate drops to the habitat-wide average rate, maximizing long-term energy gain.

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