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31 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Growth rate |
In a population the number of a new individuals that are produced in a given amount of time minus the number of individuals that died |
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Population increase depends on? |
Birth rates and immigration |
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Population decrease depends on? |
Death rates and emigration |
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Exponential growth |
Have no distinct reproductive season but instead reproduce more or less continuously Has constant rate of increase and assumes year-round production |
Continuous exponential growth |
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Geometric growth |
When young are added to the population only during discrete reproductive. Modeled as the instantaneous change in population that occurs over a very small interval of time |
Discrete exponential growth |
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Intrinsic growth rate r |
The highest possible per capita growth rate for a population |
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When a species is first introduced to a new environment after disturbance population growth is often? |
Exponential |
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Population size is ultimately limited by availability of? |
Resources |
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Geometric growth model |
A model of population growth that compares population sizes at a regular time intervals |
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Geometric growth model assumptions |
Non-overlapping Generations Constant rate of increase Unlimited resources, no impact by predation |
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Assumptions of per capita growth rate 6 |
Closed population Unlimited resources No genetic structure No age / size structure Continuous growth with no time lags Non-overlapping Generations |
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Population when I unchecked increases blank |
Geometrical ratio |
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Subsistence increases only in |
Arithmetical ratio |
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Density independent |
Factors that limit population size regardless of population density |
Weather toxins Etc |
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Density dependent |
Factors that affect population size in relation to the populations density |
Transmittable disease, competition, parasitism, predation |
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Is contagious disease density dependent or independent? |
Density dependent |
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Allee effects |
In small populations, there is a positive correlation between population size and r |
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Logistic growth |
Population growth that is restricted by a resource availability at higher densities |
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Carrying capacity k |
Maximum population size that can be sustained in a given environment |
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A carrying capacity the population growth rate is? |
0 |
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Assumptions the logistic growth model |
Close population No genetic structure No age / size structure Continue with girls with no Time lags Constant carrying capacity Population growth governed by intraspecific competition |
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Models for one species system |
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Age structure |
Distribution of Ages within a population based on age classes pre reproductive reproductive post-reproductive |
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Age diagram |
Allow you to visualize the distribution of individuals among the age classes |
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Wider at the base and the top means? |
Populations growing |
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Similarweb at top and bottom memes? |
Population is stable in size |
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Wider at the top than the bottom |
Population is shrinking |
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Type 1 survivorship |
Shows increased mortality after the midpoint of life Organisms tend to produce few Offspring but have high parental investment |
Humans |
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Type 2 survivorship |
Equal probability of mortality at each life stage Organisms have moderate levels of both Offspring numbers and parental investment |
Birds |
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Type 3 survivorship |
Increased mortality early in life Organisms produce large numbers of Offspring with very little parental |
Plants |
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Demography |
Study of births and deaths in a population Life tables are used to determine the stability of different life stages |
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