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Related Flashcards
Cards In This Set
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Three different measurements used to describe populations
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-Population density
-numbers counted -space occupied |
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Population Size
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# of individuals of a specific species occupying a given area/volume at a given time
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Population Density
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# of individuals of the same species tjat pccir per unit area or volume
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What is the difference between population size and population density?
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Size: total amount of species for a location
Density: avg number of a species/area or volume |
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Why do small organisms usually have higher population densities than larger organisms?
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-take up less space, more room for more of them
-can have high population size, and still not interrupt each other's survival chances |
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Define crude density
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Includes all land within a given organism's range
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Define ecological density
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Only includes portions of the land that are in reality colonized by a given species
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What is population dispersion?
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The general pattern in which indiciduals are distributed through specified areas
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Clumped Dispersion
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A pattern in which individuals in a population are more concentrated in certain parts of a habitat. (ex. yellow goatfish clumped in schools)
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Uniform Dispersion
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A pattern in which individuals are equally spaced out throughout a habitat (ex. Nesting King penguins)
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Random Dispersion
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The pattern in which individuals are spread throughout the habitat in an unpredictable/patternless manner (ex. trees in a rainforest)
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What determines the type of dispersion a species exhibits?
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Nature of relationships within the population and surrounding environments
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What type of dispersion pattern is rarest in nature and why?
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-uniform distrubution
-animals are primitive and have no sense of order |
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Define environment.
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An ecosystem with certain biotic and abiotic resources at any given time
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List biotic resources that can be limited
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Prey and plant availability, depending on season, natural disasters, etc.
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