Transcript Carrying Capacity PPT

I CAN EXPLAIN CARRYING CAPACITY.
CHANGES IN POPULATION SIZE:
ENTRANCES AND EXITS

Populations increase through births and
immigration

Populations decrease through deaths and
emigration
CARRYING CAPACITY
maximum population of a given species that
can survive indefinitely in a given environment
 no population can increase its size indefinitely

GROWTH CURVES

Populations grow
rapidly with
ample resources,
but as resources
become limited,
its growth rate
slows and levels
off.
GROWTH CURVES

As a population
levels off, it often
fluctuates slightly
above and below
the carrying
capacity.
EXCEEDING CARRYING CAPACITY: MOVE,
SWITCH HABITS, OR DECLINE IN SIZE

Members of
populations which
exceed their
resources will die
unless they adapt or
move to an area with
more resources.
I CAN IDENTIFY LIMITING FACTORS.
LIMITING FACTORS
Things that prevent a
population from growing
any larger
 Examples: availability of food, water,
shelter and space, competition for
resources, predation and disease
 If any of the limiting factors change,
animal and plant populations change

EXAMPLE

Ten rabbits may live in a habitat that has
enough water, cover and space to support
twenty rabbits, but if there is only enough food
for ten rabbits, the population will not grow any
larger. What is the limiting factor?
POPULATION CHANGES

What are some
OTHER factors that
would
affect the size of a
population?
Self Check!!
I CAN EXPLAIN CARRYING CAPACITY.
I CAN IDENTIFY LIMITING FACTORS.