2.4 Flashcards
Best random sampling dispersion
Uniform
Uniform dispersion
Usually territorial animals
Random dispersion
Usually plants that are dispersed by the wind
Clustered dispersion
Animals that herd around something or stay in close quarters with each other
Population growth formula
Births +Immigration> Deaths +Emigration
Population decline formula
Births +Immigration < Deaths+ Emigration
Population stable formula
Births +Immigration= Deaths+ Emigration
time
t
Independent Density
Effect is not dependent on the populations density
Dependent Density
Effect is dependent on the density of the population
Limiting factors
Dependent and independent density
Exponential Equation
rN
Logistic Equation
rN(K-N)/K
Exponential
Population has unlimited growth
Logistic
Population is limited by factors
K
Carrying Capacity
N0
Initial population
r
maximum per capita growth rate
dN/dt
growth rate
R-Selected
Smaller animals in larger litters that receive little attention from the parent
K- Selected
Larger animals in small litters that receive lots of attention from the parent.
Type 1 survivorship
Long lifespan few deaths before lifespan ends K-selected animals
Type 1 survivorship
Long lifespan few deaths before lifespan ends K-selected animals
Type 2 survivorship
Constant death rate doesn’t fluctuate
type 3 survivorship
High death rate R-selected animals
Calculate percentage
(Number surviving/cohort) x 100
Cohort
Original number of subjects in the overall group.
