Ecology is the study of the inter-relationships between organisms and their environment.
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Define an environment.
An environment includes both non-living (abiotic) and living (biotic) factors.
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Define an ecosystem.
An ecosytem is made up of all the interacting biotic and abiotic features in a specific area.
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Define a population.
A population is a group of interbreeding organisms of one species in a habitat.
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Define a community.
A community is defined as all of the populations of different organisms living and interacting in a particular place at the same time.
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Define a habitat.
A habitat is the place where a community of organisms lives.
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Define an ecological niche.
An ecological niche describes how an organism fits into the environment.
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What are the 3 factors to consider when using quadrats?
The number of quadrats used, the size of quadrat to use, and the position of quadrats within the study area.
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When discussing quadrats, define frequency.
The frequency is the likelihood of a particular species occuring in a quadrat.
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In terms of using quadrats, define percentage cover.
Percentage cover is an estimate of the area within a quadrat which a particular plant species covers.
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Using the mark-release-recapture technique, how can estimated population size be calculated?
Estimated population size = total number of individuals in first sample x total number of individuals in second sample / number of marked indiciduals recaptured
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What are the abiotic factors that can limit the size of a population?
Temperature, light, pH and water and humidity.
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What is intraspecific competition?
Intraspecific competition occurs between individuals of the same species.
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What is interspecific competition?
Interspecific competition occurs between individuals of different species.
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Which factors affect the growth and size of human population?
Birth rate, death rate and migration.
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What factors affect human death rate?
Life expectancy, food supply, safe drinking water, effective sanitation, medical care, natural disasters, and war.
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What 3 types of population can be represented in age population pyramids?
Stable, Increasing and decreasing.
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Other cards in this set
Card 2
Front
Define an environment.
Back
An environment includes both non-living (abiotic) and living (biotic) factors.
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