Community Ecology

Community Ecology - Community Ecology : I. Int roduction:...

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Community Ecology : I. Introduction: a. Definitions: i. Population: organisms of a particular species that live together and interbreed. ii. Community: a group of populations. iii. Ecosystem: a community plus its physical environment. iv. Ecology: the study of interactions between organisms, and between organisms and their environments. v. Environment: the conditions under which an organism lives. There are abiotic and biotic environmental aspects. vi. Habitat: the location where an organism is found. vii.Niche: an organism’s role in its community. viii. Biome: communities of a particular type, all over the world. II. Interactions: a. Symbiosis—symbiotic interactions. i. Living together of 2 or more kinds of organisms, more or less indefinitely. ii. Categories of symbiosis: 1. Commensalism: one organism benefits, the other is neutral. a. E.g. marine passengers, such as barnacles living on whales, or green algae growing on turtles. 2. Parasitism: one organism (parasite) benefits, the other (host) is harmed.
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a. Most parasites do not kill their host. Because that would be stupid. b. Parasites can be inside (endoparasite) or outside (ectoparasite) their hosts. 3. Mutualism: both organisms benefit. a. May be obligatory or facultative (optional). b. E.g. N-fixing bacteria and members of the Pea family.
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This note was uploaded on 05/07/2011 for the course BIO 191 taught by Professor Douglas during the Fall '10 term at Boise State.

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Community Ecology - Community Ecology : I. Int roduction:...

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