1. Species interactions

2. Symbiosis
Symbiosis is the term used to describe close interactions between two or more different species

3. Species interactions can be described as either
Interspecific
Eg.Competition between members of different species for resources such as food,etc.
This is usually less intense
Remember Gause’s competitive exclusion principle!
Two organisms cannot occupy the same niche
Intraspecific eg. competition between members of the same species for resources such as food, breeding sites , territories etc.
This is usually intense.

4. Exploitation Predation- predators and prey
One species benefits at the expense of another
it can be divided into:-
Predation- predators and prey
Herbivory- animals eat or graze on plants
Parasitism-
Ecto parasites live outside the hosts body.
Endo parasites live inside the hosts body.

5. Predator / Prey interactions
predators and prey often regulate each others populations. They often mirror each other when there is not much prey swapping. When there are lots of hares , there are lots of lynx.