1. Interactions in Ecosystems
Ecological Relationships

2. Biotic Interactions Different organisms interact in different ways:
Competition: interaction between two or more organisms that compete for resources
Predation: interaction where one organism eats another for energy
Symbiosis: interaction where one organism lives in, on or near another organism

3. Symbiosis in-depth Symbiosis can be broken into three sub- types:
Mutualism: both species benefit from the symbiotic partnership (ex. bees and flowers)
Commensalism: one species benefits where the other is unaffected (ex. between buffalo and birds)
Parasitism: one species benefits, usually at the expense of the other species (ex. ticks, fleas, leaches)

4. Mutualism
The example shows a lichen growing on the trunk of a mangrove tree. The lichen consists of a fungus and an algae growing together. The fungus gets food from the photosynthesising algae and the algae gets a place to live.

5. Commensalism
. This tiny, well-camouflaged clingfish provides a classic
example of commensalism. The clingfish gains protection by hiding on its host — a crinoid — while the host is unaffected

6. Parasitism
All tapeworms spend the adult phase of their lives as parasites in the gut of a vertebrate animal (called the primary host). Most tapeworms spend part of their life cycle in the tissues of one or more other animals (called intermediate hosts

7. Name that Relationship