Monday, September 3, 2012

Pearlfish and Sea Cucumber

Symbiosis is typically associated with one meaning; a mutually beneficial relationship.  However, there are three different types of symbiosis. 
Parasitism, where the parasite benefits and the host is hurt. 
Commensalism, one species benefits and the other is not helped or hurt.  
Mutualism, both species benefit. 
("Symbiosis", marietta.edu/~biol/biomes/symbiosis.htm)
  

An example of Commensalism is the Pearlfish and Sea Cucumber. The Pearlfish spends all day in the alimentary tract (intestines) of the sea cucumber and at night emerges from its anus to feed on crustaceans. 

("Symbiosis", www.ms-starship.com/sciencenew/symbiosis.htm)


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