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20 Cards in this Set
- Front
- Back
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Individuals occupying a given area at a given time are considered to constitute a population if they also belong to the same ____
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Species
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Average number of individuals of the same species per unit of the total surface area at a given time is _____
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Population crude density
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The most popular type of population distributions is ____
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Clumped
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Uniform distribution of human habitats is likely the result of ____ whereas habitats of other animals are likely due to _____
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community planning, competition
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What determines population size?
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deaths
births immigration emigration |
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Explain zero population growth
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When deaths, births, emigration, and immigration cancel each other out
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G = rm N results in a _____ curve when graphed
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J-Shape
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A population of tigers is most likely to have what type of survivorship curve?
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Type - 1
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in G = rmN, if r = 0 , what will happen to the growth rate
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It will become negative
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____ limits populations
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Carrying capacity
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The maximum number of individuals of a species that a given environment can sustain indefinitely is known as _____
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Carrying capacity
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When does a J-shape curve become and S-shape curve?
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When the species reaches its carrying capacity
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Feedback mechanisms that operate whenever populations change in size are known as ______
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Density Dependent factors
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A flood is a density- ______ factor
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Independent
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Temperature is a density-____ factor
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Independent
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Organisms that demonstrate a type-1 survivorship curve have a ___ - r, and ______ offspring.
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low-r
large offspring |
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What does r represent in G = rm N?
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Rate of natural increase (net reproduction per individual per year)
(high r for indiv. that reproduce often) |
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A Type ___ survivorship curve has a high mortality early in life
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III
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A Type ___ survivorship curve has a constant rate of mortality at all ages
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II
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A Type ____ survivorship curve has a low rate of mortality early in life
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I
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