Symbiosis is a close and often long term interaction between two biological species. The intimate association or close union of two dissimilar organisms. There are four forms of symbiosis: amensalism, commensalism, mutualism, and parasitism. Within symbiotic unions, the partners are so dependent on each other they can no longer independently survive.
Symbiosis is an extreme form of ecological relationship between different members of living organism species. It refers to the fact that each partner within the symbiotic union derives benefits from the other. Within symbiotic unions, the partners are so dependent on each other they can no longer independently survive. For example within the plant kingdom, lichens live in symbiosis with the fungi. The fungal (mycobiont) symbiont provides protection for the lichen, while the green-algae or bacterial (photobiont) symbiont provides the fungi with sugars, which it creates through the process of photosynthesis.
Amensalism symbiosis occurs when one living organism species impedes the success of another living organism species. The first species is neither positively nor negatively affected by the presence of the second species. Many times this type of symbiosis can happen with plants when when the first species produces a chemical compound that is harmful to the second species.
Commensalism symbiosis occurs when one living organism species benefits from the presence of another living organism species. The second species is not affected by the presence of the first species. This type of symbiotic union occurs when the first species does something to benefit the second species, such as a cow walking through a field stirring up the insects in the grass, with birds following and having a feast by eating the insects.
Mutualism symbiosis occurs when both living organism species benefits from the interaction between each other. An example of mutualistic symbiosis is the relationship between bullhorn acacia trees and certain species of ants.
Parasitism symbiosis occurs when one living organism species takes up residence on another living organism species, while feeding on the hosts body. The host is harmed and parasites that are biotrophic don’t do enough damage to kill the host, but other parasites know as necrotrophic do kill the host. An example of a biotrophic symbiotic relationship would be a tick feeding on the blood of its host.