1. Niche
It is the overall role of an organism in a community. It is where the organism lives, what it eats, when it eats, when it rests, when it reproduces, etc. It is the “rule book” for the organism. NO TWO SPECIES CAN BE IN THE EXACT SAME NICHE!

2. Competition
Two organisms use the same resource. They both want the same thing.
The competition can be:

3. Intraspecific competition
Vs.

4. Interspecific competition
Vs.

5. Resource partitioning

7. Adaptive radiation

8. Unknown ancestor from the South American mainland

9. Foreign Species Not native to an ecosystem
Often have no natural predators to control their population
Can out-compete native species for a niche

10. Purple Loosestrife

11. English Ivy

12. Himalayan Blackberry

13. Morning Glory

14. Giant Hogweed

15. Scotch Broom

16. Eurasian Watermilfoil

17. Eastern Grey Squirrel

18. Black Slug

19. American Bullfrog

20. Mute Swan

21. Red-Eared Slider Turtle

22. Ecological succession
It is the gradual change in the type of plants that form the majority of the producers in an environment. This change takes place over hundreds or thousands of years.
There are two main kinds:

23. There is no soil to begin with. Lichens change bare rock into nutrients.
Primary

24. There is soil but all the producers have been removed due to fire or flood. Succession is faster because small plants move in relatively quickly.
Secondary

25. Succession in an aquatic environment

27. End