What is Commensalism?
[[File:Fly June 2008-2.jpg|right|thumb| [[Mite]]s get transport on a fly (''Pseudolynchia canariensis'')]] '''Commensalism''' is a type of relationship between two [[organisms]]. In commensalism, one organism is helped while the other is not affected. In practice, it is difficult to show that the passive organism is not harmed. For example, some birds live in holes in trees. Does this damage the tree? [[Mite]]s, which cannot fly, often hitch a ride on insects. Does this affect the insect's [[fitness]]? There is no definite answer to such questions. [[Orchid]]s, [[moss]]es, and [[lichen]]s all grow on [[tropical]] trees. They need sunlight, and by being higher up they get to the sunlight. All that can be said for sure is that the trees continue to live and reproduce, and so it is assumed that these [[epiphyte]]s do not affect their host plant. Pierre-Joseph [[van Beneden]] (1809{{ndash}}1894) introduced the term into [[evolutionary biology]] and [[ecology]] in the 1870s.<ref>Boucher D.H. 1985. The idea of mutualism, past and future. In D.H. Boucher (ed) ''The biology of mutualism: ecology and evolution''. Oxford University Press. 1{{ndash}}28</ref> == Amensalism == Amensalism is a symbiotic relationship in which one organism is harmed or inhibited and the other is unaffected. Examples of amensalism include the shading out of one plant by a taller and wider one and the inhibition of one plant by the secretions of another (known as allelopathy). == Related pages == *[[Mutualism]] *[[Symbiosis]] *[[Parasitism]] == References == {{Reflist}} [[Category:Symbiosis]]