BIO120H1 Chapter 16: Bio Chapter 16.doc
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BIO120H1 Full Course Notes
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(328-335, a; 335-339, c; connell"s barnacles and paine"s starfish, a) Competition: use of defense of a resource by one individual (intraspecific) or species (interspecific) which subsequently makes the resource less available to other individuals or species. Intraspecific competition, in particular, regulates populations in a density-dependant manner. With interspecific competition, species will regulate the size of the other population as well as their own. When resource is scarce, populations may reach a stable state and stop growing; one speices may also outcompete the other, resulting in the other"s extinction. Resource is not limited to food; things like shelter and space (particularly important for immotile/sessile animals) also function as resources as they can be used or consumed and made unavailable to other individuals. Darwin reasoned that competition would be more intense between closely related species as their similar structure creates a need for similar resources.