Chapter 20 Flashcards
Most Common pattern of distribution
clumped
Least common pattern of distribution
random
Factors affecting population growth
birth rate
death rate
immigration
emigration
population explosion
rapid increase in population that’s too fast to be contained
population crash
rapid decrease in population
Biotic Potential
the highest possible per capita growth rate
Lag phase
slow population growth due to few individuals able to reproduce
Exponential growth phase
(r)
rapid population growth due to much higher birth rate then death rate
Stationary Phase
birth and death rates are equal
Carrying Capacity
(k)
theoretical maximum sustainable population
Density Dependent Factors
biotic factors that limit the carrying capacity
predators, parasites, disease
Density Independent Factors
abiotic factors that limit carrying capacity
droughts, floods, fires
Environmental Resistance
total affect of all limiting factors (biotic and abiotic)
r Selected Strategies
species that produce close to their biotic potential
short life span
many offspring
affected by density independent factors
exp mouse
k Selected Strategies
populations which live close to their carrying capacity
larger
less offspring
affected by density dependent factors
elephant