Download Population Distribution Ecological Factors

The Living World
 Population
distribution is the way in
which individuals are dispersed within
their habitat
 There
are three patterns of distribution
• Clumped distribution
• Uniform Distribution
• Random Distribution
Clumped Distribution:
•This is the most common
•Individuals form groups
•Usually happens when some
areas of the habitat offer better
living conditions
Uniform Distribution:
•Individuals are dispersed equally
In habitat
•Often caused by competition for
resources
Random
Distribution:
•Rarely found in
nature
 Choose
the appropriate type of Population
Distribution
1.
2.
3.
Fish move around in schools, which
reduces the effort to swim and provides
protection from predators _____________
Birds space their nests at regular intervals
to allow each bird a minimum territory
____________________
Poison Ivy is dispersed in a forest
_______________________
 Populations
are dependant on ecological
factors
 We have 2 types of ecological factors
1. Abiotic: Non- living factors ( physical or
chemical) that affect the environment that a
species chooses
2. Biotic: Living factors that affect the
environment that a species chooses
Examples of Abiotic and Biotic Factors
Abiotic Factors
Biotic Factors
Amount of Light
Birth Rate
Soil or water pH
Disease
Depth of Snow
Amount of Food
Temperature
Predation
Terrain
Competition
Humidity
Human ACtivity
 The
intensity of an ecological factor will
have a role on its effect on the
population
 If
the factor is so strong that it reduces
the population density or prevents its
growth we call it a LIMITING FACTOR
 Populations
go through periods where
they get bigger and then other periods
when they get smaller
 We call this the BIOLOGICAL CYCLE
When hare population rises, the lynx have more food
Therefore, when hares increase so do lynx!!!
When lynx increase, they hunt more hares. Over time, number of hares drops
And the lynx can’t eat
Therefore, when the hares decrease so do the lynx!!!!
When the lynx become fewer they catch less hares
Therefore….