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19 Cards in this Set

  • Front
  • Back
Marked-Recapture equation
N = (mn)/x

m = # captured and marked in 1st sample
x = # recaptured in 2nd sampling
n = total # captured in 2nd sampling
N = Total population
determines rate of change of population size.

proportion of individuals in each age class at a point in time
Age structure
Study of the vital statistics of a population and how they change over time
Demography
Vital statistics
Births, Deaths, Immigration, Emigration
age-specific summary of survival and reproductive patterns made by following a cohort from birth to death
Life Table
group of individuals of the same age
Cohort
# of individuals from a cohort that survives from birth to age x
Survivorship
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
Survivorship Type that:
– Equal probability of surviving at all ages from birth to
maximum lifespan
Type 2
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
r is the ________ rate of increase whereas dN/dt is the growth rate of the __________
-per capita

-population
(ΔN/Δt) = rN

As N gets larger growth rate ________
increases
The max pop size the environment can support =
carrying capacity (K)
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
(K-N)/K =
Fraction of K still available for pop growth
(K-N)/K ______ population growth as N approaches K
slows down
If a population is growing very fast it can exceed its carrying capacity

True or False
True but it will rapidly decline below N
The Logistic Model is Density _______
dependent
Factors that alter birth & death rates regardless of N (i.e. whether 20 or 20,000 individuals, these factors affect population
growth.
density-independent