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35 Cards in this Set
- Front
- Back
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Ecosystem
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living and non-living things that interact
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Habitats
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place where an organism lives and that provides the things the organism needs
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Biotic Factors
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living parts of an ecosystem
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Abiotic
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nonliving parts of an ecosystem
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Sunlight
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necessary for photosynthesis, to produce food
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Populations
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members of one species in a particular area
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Communities
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all the populations that live together in an area
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Organism
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belongs to a population
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Population
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belongs to a community
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Community
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living things that form part of the ecosystem
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Ecology
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the study of how living things interact with one another and with their environment
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Population Density
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the number of individuals in a specific area
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Direct Observation
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count one by one
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Indirect Observation
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use of tracks or other signs to calculate or estimate the population
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Sampling
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usually done by counting the number in a small area, then multiplying the number over a greater area to estimate the total
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Estimate
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and approximation of a number, based on reasonable assumptions
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Birth Rate
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the number of births in a population in a certain amount of time
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Death Rate
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the number of deaths in a population in a certain amount of time
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Population Statement
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If birth rate > death rate, population size increases.
If death rate > birth rate, population size decreases. |
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Immigration
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moving into a population
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Emigration
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leaving a population
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Limiting Factor
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an environmental factor that prevents a population from increasing
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Carrying Capacity
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the largest population that an environment can support
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Niche
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an organism's particular role
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Competition
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the struggle between organisms to survive in a habitat with limited resources
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Predation
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one organism hunts and kills another for food
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Prey
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the organism that is caught
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Predator
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the organism that does the killing
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Symbiosis
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a close relationship between two species that benefits at least ONE of the species
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Mutualism
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a close relationship between two species where BOTH species benefit
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Commensalism
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one species benefits and other is neither helped, nor harmed
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Parasitism
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one organism lives on or in another organism, causing it harm
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Parasite
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the organism that benefits
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Host
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the organism the parasite lives in or on
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Studying Populations
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Population Density=
#of Individuals/Unit Area #of Individuals= Population Density/Unit Area Unit Area= #of Individuals/Population Density |
