Unit a interactionsandecosystems(changes in ecosystem)

1. z
Changes in the
Ecosystem

2. zChanges in our ecosystems can result from the
following:
• Bio-invasion
• Competition
• Predation
• Weather

3. zBio-invasion:
Bio-invasion: The introduction and rapid expansion of a new
species which is not native to a particular area has a
destabilizing influence on the ecosystem.
Bio-invasive species destabilize their new ecosystems in the following
manner:
• Taking necessary food or nutrients away from the native species.
The native species suffer as a result.
• The species that is introduced may have no natural predators
therefore it's population is not controlled
• Introducing a species not natural to a particular area can cause
more problems than what it solves.

4. zBio-invasion:

5. zCompetition:
Competition: The interaction between organisms,
populations, or species, in which the life cycle depends on
their share of a limited environmental resource.
All living things compete for food, water and habitat.
Because there is a limited amount of resources to go around many
populations of species must compete for access to these basic needs.

6. zCompetition:

7. zPredation:
Predation: The act of one animal killing another animal for
food.

8. zPredation:

9. zPredation:

10. zWeather:
Weather: Temperature, and the amount of precipitation will
affect the growth of plants (the producers) positively or
negatively.
Natural disasters can also impact the populations of
producers:
• Drought
• Floods
• Untimely snowfall
Taz