BIOL 226 Chapter Notes - Chapter 54: Keystone Species, Interspecific Competition, Camouflage

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Biol 226 chapter 54 community ecology. A group of populations of different species living close enough to interact is called a biological community. Community interactions are classified by whether they help, harm, or have no effect on the species involved. Interactions with individuals of other species in the community interspecific interactions include competition, predation, herbivory, symbiosis (parasitism, mutualism and commensalism), and facilitation. Predation is a +/- interaction, with a positive effect on the survival and reproduction of the predator population and a negative effect on that of the prey population. Mutualism is a +/+ interaction because the survival and reproduction of both species are increased in the presence of the other. A 0 indicates that a population is not affected by the interaction in any known way. Interspecific competition is a -/- interaction that occurs when individuals of different species compete for a resource that limits their growth and survival.

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