Population
Growth
Biology Ch 5-1& 5-2
Exponential Growth
 Under
ideal
conditions with
unlimited resources
and protection
from
predators/disease,
a population will
grow continually
 The larger it gets,
the faster it grows
Logistic Growth
 Population’s
growth slows and
then stops
following a period
of exponential
growth
 Eventually
populations run out
of space and
resources
Carrying Capacity
 The
maximum
number of
individuals the
environment can
support
 Once carrying
capacity is
reached, factors
act to stabilize it at
that size
Population Limitations
 Density

Limitations of a population due to the size
of the population
 Density

Dependent Factors
Independent Factors
Affect all populations in similar ways,
regardless of population size and density
Limiting Factors
Density Dependent
 Predation/Parasitism
 Resource
Competition

Food, water, shelter
 Health

Disease
Explain the graph!
Density Independent
 Natural

Disasters
Tornado,
Hurricane,
Volcanism, Human
activities etc.