What is the motivation behind parasitistic behavior

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1. What is the "myth of the equilibrium"? Is there more than one application of this concept in the study of ecology?

2. Explain the relationship of optimal foraging and the ideal free distribution

3. What is the motivation behind parasitistic behavior? What risks (in terms of life history, individual health, future of the population, etc.) is the parasite taking by evolving this behavior.

4. How would you model a predator-prey relationship where a prey population (let's say a mayfly nymph) displays no change in abundance, though one predator increased in abundance (perhaps a sculpin) and another decreased (perhaps a stonefly)?

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