Economics 1021A/B Lecture Notes - Lecture 12: Optimal Foraging Theory, Aposematism, Cactus

• School: Western University
• Department: Economics
• Course: Economics 1021A/B
• Professor: Tim Hain

Document Summary

Exploitation: a relationship in which one organism benefits by feeding on, and directly harming, another. Herbivore: eats tissues of living plants or algae. Predator: kills and eats other organisms, referred to as prey. Parasite: lives in or on another organism, feeding on parts of it: usually doesn"t kill the host but some can cause diseases. Parasitoids: insects that lay an egg on or in another insect host. After hatching, larvae remain in the host, which they eat and often kill: predators and herbivores both feed on multiple individuals, herbivores don"t usually kill the food organisms as predators do. Sit-and-wait predators: remain in one place and attack prey that move within striking distance. Include sessile animals: barnacles and carnivorous plants. Snails with thickest shells are the last to take refuge. Removal of apical buds may allow lower buds to open and grow. In field gentians, early herbivory results in compensation, but later in the season it does not.