Test 3 Flashcards
Rate of growth
Indicator of ecological conditions
Number of individuals in population
Biotic factor
Living factor that limits population growth (predator, parasite)
Abiotic factor
Nonliving factor that limits population (disease, competition, stress crowding)
Exponential Growth
Unrestricted population growth
(J curve)
Not often or for long duration
Exponential Growth Example
Invasion of opportunistic species into new environment
Discrete reproduction
Die after reproduce
No overlapping generations
(Moths)
N=No*Ro^t
Discrete equation for population size
Ro= net reproductive rate (doubling)
-# of females produced per current female
N=population size (future)
No= initial population size
t= # of time periods (days, months)Continuous Reproduction
Overlapping generations
Humans
🔼N/🔼t=rN
Continuous equation for growth rate N= # of individuals in population r= intrinsic rate of increase r= average birth rate - average death rate r=b-d
N=No*e^rt
Continuous equation for long term population size
N= # of individuals in popular.at ion
r=average birth rate - average death rate
Population size increasing
Ro
Population size constant
Ro=1
r=0
Population size increasing
Ro>1
r=positive
Logistic Growth
Restricted population growth
Growth slows as it approaches maximum size
Carrying capacity
K
Maximum population size an environment can sustain
