Biology 2483A Lecture Notes - Lecture 13: Chestnut Blight, Genotype Frequency, Myxoma
19 Dec 2017
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Document Summary
Symbionts: organisms that live in or on other organisms. More than half of earth"s species are symbionts. Our own bodies can be a home to many other species. A parasite consumes the tissues or body fluids of the organism on which it lives (the host). Pathogens are parasites that cause diseases (an abnormal condition affecting the body of an organism). Parasites typically harm, but don"t immediately kill, the organisms they eat (unlike. Compare: the fungus that causes athlete"s foot, and yersinia pestis, the bacterium predators). Degree of harm varies widely. that causes the plague. Parasites typically feed on only one or a few host individuals. Include herbivores such as aphids or nematodes that feed on one or a few host plants. Parasitoids: insects whose larvae feed on a single host and almost always kill it. Macroparasites: large species such as arthropods and worms. Ectoparasites live on the outer body surface of the host.
