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| expression of the total number of organisms in a biological community |
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1. limited range of physiological modifications, called acclimations, available to individual organisms
2. inheritance of specific genetic traits that allow a species to live in a particular environment evolution |
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| organisms within a community must compete for all the survival necessities: energy and matter in usable forms, space and specific sites for life activities. |
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| measure of the number of different species, ecological niches, or genetic variation present |
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| process by which organisms occupy a site and gradually change environmental conditions by creating soil, shade, shelter, or increasing humidity. over time communities become more diverse. |
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| interspecific competition |
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| intraspecific competition |
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| a species who impact on the population size of other species in its community is much larger and more influential than would be expected from its mere abundance |
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| a process in which those members of a population that are best suited for a particular set of environmental conditions will survive and produce offspring more successfully than their ill-suited competitors |
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| species specific habitat, lifestyle, and resource usage habitats. |
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in primary succession, the species that first colonizes the new area
-often nicrobes, mosses and lichens |
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| in primary succession, the species that first colonizes the new area |
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| occurs when an existing community is disrupted and a new one subsequently develops at the site |
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| intimate living together of members or two or more species |
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| the max and min levels beyond which a particular species cannot survive or is unable to reproduce ex. moisture levels, soil and water chemistry and living space. |
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