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Biological interactions

Campbell Biology 9th Edition - Ch.54 Community Ecology

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Chapter 54: Community Ecology Community = group of populations of different species living close enough to interact Interspecific interactions Can be positive (+), negative (-) or neutral (0) Includes: Competition (-/-) Predation (+/-) Herbivory (+/-) Symbiosis ? parasitism, mutualism, commensalism Facilitation (+/+ or 0/+) Interspecific competition: resources are in short supply Species interaction is -/- Competitive exclusion principle: Two species cannot coexist in a community if their niches are identical. The one with the slight reproductive advantage will eliminate the other Resource partitioning: differences in niches that enable similar species to coexist Ecological niche: the sum total of an organism?s use of abiotic/biotic resources in the environment

Campbell Biology 9th Edition - Ch. 53 Population Ecology

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Demography
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POPULATION ECOLOGY Chapter 53 Population = group of individuals of a single species living in same general area Density: # individuals / area Dispersion: pattern of spacing between individuals Introduction Determining population size and density: Count every individual Random sampling Mark-recapture method Patterns of Dispersal: Clumped ? most common; near required resource Uniform ? usually antagonistic interactions Random ? unpredictable spacing, not common in nature Additions occur through birth, and subtractions occur through death. Life table : age-specific summary of the survival pattern of a population Demography: the study of vital statistics that affect population size Survivorship Curve: represent # individuals alive at each age
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