Habitats
Published on Nov 21, 2015
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PRESENTATION OUTLINE
Commensalism
Commensalism is a type of relationship where one of the organisms benefits greatly from the symbiosis. The other is not helped but is not harmed or damaged from the relationship. In other words, this is a one-sided symbiotic relationship. Example: The relationship between cattle egrets and cattle.
The cattle egret will eat insects that have been disturbed when the cattle forage.
In some of these commensalism relationships, the organism that is reaping the benefit will use the other for protection or transportation. Example: A hermit crab taking up residence in an empty seashell.
Example: A spider building a web on a tree.
Photo by miez!
Parasitism
In parasitism, one organism benefits from the relationship but at the expense of the other. The organism may live inside the other’s body or on its surface. In some of these parasitic relationships the host dies and in others, it is important that the host remain alive.
Example: Fleas and mosquitoes feed on blood from other organisms.
In this type of parasitic relationship, the host needs to stay alive and it is not damaged greatly. Example: Barnacles that attach to the bodies of whales.
The whale is not harmed greatly, but may have some pain or itching. Example: Tapeworms
Tapeworms do more damage to their hosts because they eat partially digested food and that deprives the host of some food and nourishment. Example: Aphids. Aphids eat sap from plants.
Photo by Nottsexminer
Mutualism
An example of a Mutualism is a human and a dog.
The dog supply protection and companionship while the human provides food and shelter.
Photo by DVIDSHUB
