All Flashcards
(41 cards)
Demography
study of the vital statistics of a population and how they change over time
immigration
coming in
emigration
leaving
crude birth and death rates are based on total number of births or deaths per
1,000 people in a population
Direct Count or Census
count all the individuals in a population (humans)
Quadrat
individuals are counted within a sample area (plants)
Capture-Recapture
count and mark number of individuals in area and return to habitat. then go back and count again
What kind of species live clumped?
Animals
What kind of species live Uniform?
plants, for nutrients and non competition
What kind of species live Random?
Dandelions or weeds
Not mature enough to reproduce
pre reproductive age(0-14)
those capable to reproduction
Reproductive age(15-44)
those too old to reproduce
post reproductive age (45+)
rate at which population would grow if it had unlimited resources
intrinsic rate of increase (r)
maximum population of a given species that a particular habitat can sustain indefinitely without degrading the habitat
Carry Capacity (K)
Number of individuals in a population found in a particular area or volume
population density
Density Independent Factors
seasons climate temperature hurricanes tornadoes drought floods
Density Dependent Factors
Competition predation disease behavior reproductive capacity
Regulating/ Limiting Factors is AKA
Environmental Resistence
Maximum possible growth rate
biotic potential
J Curve
Steep and growing line
S curve
line at or around carrying capacity that is relatively constant and not growing
fluctuates slightly above and below carrying capacity
stable
populations explode and then crash to a more stable level
irruptive