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19 Cards in this Set
- Front
- Back
Marked-Recapture equation
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N = (mn)/x
m = # captured and marked in 1st sample x = # recaptured in 2nd sampling n = total # captured in 2nd sampling N = Total population |
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determines rate of change of population size.
proportion of individuals in each age class at a point in time |
Age structure
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Study of the vital statistics of a population and how they change over time
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Demography
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Vital statistics
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Births, Deaths, Immigration, Emigration
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age-specific summary of survival and reproductive patterns made by following a cohort from birth to death
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Life Table
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group of individuals of the same age
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Cohort
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# of individuals from a cohort that survives from birth to age x
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Survivorship
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Survivorship Type that:
– High probability of surviving when young - High probability of surviving during middle age - Probability of surviving begins to decrease rapidly as an individual nears the maximum lifespan for the population. |
Type 1
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Survivorship Type that:
– Equal probability of surviving at all ages from birth to maximum lifespan |
Type 2
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Survivorship Type that:
– Low probability of surviving when young -- Once reach a critical age have a high probability of surviving until near the maximum lifespan of the population. |
Type 3
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r is the ________ rate of increase whereas dN/dt is the growth rate of the __________
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-per capita
-population |
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(ΔN/Δt) = rN
As N gets larger growth rate ________ |
increases
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The max pop size the environment can support =
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carrying capacity (K)
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Logistic growth:
At _____ N population growth rate ______ as N increases. As N approaches K the growth rate _________ At K, the population ________ growing |
At low N, like exponential, population growth rate increases as
N increases; - BUT as N approaches the maximum population size the environment can support (K), the growth rate slows down; - Once N reaches K, the population stops growing |
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(K-N)/K =
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Fraction of K still available for pop growth
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(K-N)/K ______ population growth as N approaches K
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slows down
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If a population is growing very fast it can exceed its carrying capacity
True or False |
True but it will rapidly decline below N
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The Logistic Model is Density _______
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dependent
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Factors that alter birth & death rates regardless of N (i.e. whether 20 or 20,000 individuals, these factors affect population
growth. |
density-independent
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