PCB 4043 Chapter Notes - Chapter 14: Public Health, Red Blood Cell, Cestoda
31 May 2016
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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). Parasites typically harm, but don"t immediately kill, the organisms they eat (unlike predators): degree of harm varies widely, compare: the fungus that causes athlete"s foot, and yersinia pestis, the bacterium that causes the plague. 14. 1: parasites typically feed only on 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. Endoparasites live inside their hosts, within cells or tissues, or in the alimentary canal. The alimentary canal is excellent habitat for many parasites.
