1. Population Distribution Ecological Factors
The Living World

2. Population Distribution
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

3. Population 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

4. Populations Distribution
Random Distribution:
Rarely found in nature

5. Population Distribution
Choose the appropriate type of Population Distribution
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
_______________________

6. Ecological Factors Populations are dependant on ecological factors
We have 2 types of ecological factors
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

7. Ecological Factors 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

8. Ecological Factors
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

9. Biological Cycles
Populations go through periods where they get bigger and then other periods when they get smaller
We call this the BIOLOGICAL CYCLE

10. 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….