BIOL 121 Chapter Notes - Chapter 53: Intermediate Disturbance Hypothesis, Keystone Species, Species Richness
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BIOL 121 Full Course Notes
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Community: several species populations living and interacting together in the same area. Often a population"s fate is linked to the actions of other species living around it. The focus is on what effect the interaction has on the two species" fitness: benefits: positive (+) interaction, hurts: negative (-) interaction, no effect: neutral (0) Least studied and so less of a focus. Three main themes: species interactions can affect distribution and abundance of a particular species, species act as agents of natural selection when they interact. Coevolution: the actions of one species force the other to evolve, and vice versa. Coevolutionary arms race: a repeating cycle of reciprocal adaptation because predators and prey, parasites and hosts, and other interaction species: the outcome of interactions among species is dynamic and conditional. Competition resources, those resources are not available for the individual to use. Competition lowers fitness of both individuals involved because when competitors use.
