Things i learn my class

population size

N

Total number of individuals

population density

number of individuals in the area

demography

statistical study of population dynamics

Territorial organisms

uniform dispersion patter

Social

herds, resources

Clumps

If it is dry time, everyone comes to h2o but not socializing, just best resource

Random dispersion

plants

Carrying capacity

amount can support without degrading the environment

Too many would destroy the species bc of competition, lack of resources

As you get closer to carrying capacity growth rate

decreases or slows down

Experiment equation

dN/dT=rN

Carrying capacity equation

rmax (k-N)/k times N

Resource depletion

ran out of resources

Survivorship curve

probability of individuals serving to a particular age

Late loss

type 1

Humans

Start high and as time passes we die with age

Constant loss

type 2

Birds

Linear line of decrease

Early loss

type 3

Trees, earthworms

Start high and population decreases suddenly in a curve

comp for resources

food

O2

H2O

Space

Mates

Interspecific

many species competing

Intraspecific

1 species competing

Density dependent factors

matter how many organisms

As population becomes more dense, the greater mortality rate (disease, comp, parasites)results in lower fecundity

Blue and gold days=low density of people to prevent disease

Fecundity

average number of offspring individual has

Density independent factors

factors that cause death that aren’t related to density

Natural disaster

Weather

Flood, fire

House destroyed in flood or tornado means you don’t have a house either way

K selected

exists close to carrying capacity, tend to have stable environments, care for young, long lifespans

Type 1

R selected

large number of offspring, not all survive

Type 3