Biology 2483A Lecture Notes - Guppy, Yellow Jacket, Body Plan
5 Dec 2013
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Document Summary
Over half the species on earth get energy by feeding on other organisms, in a variety of types of interactions. Some kill-then eat, others graze on living organisms. All are 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 (its host), feeding on parts of it. Individual parasites usually feed on only one or a few host individuals. Not all organisms fit neatly into these categories. Some predators, such as wolves, also eat berries, nuts, and leaves. Some herbivores (sheep) eat helpless birds as well as plants. 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.
