MARINE BIOLOGY 13. Community Ecology in the Sea, 2/25/2014 I. Population size, dynamics, and spatial distribution (on both geographic and habitat scales) can be influenced by A. physical/chemical environmental conditions B. interactions among species: competition (-,-), predation and parasitism (-,+), mutualism (+,+) II. An ecological communityconsists of co-occuring species; all competitive, predatory, and mutualistic interactions between pairs of species are embedded in a more or less complex web of other interactions III. Descriptive and dynamic characteristics that emerge at the community level of ecological organization:
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