Commensalism

usgb/kəˈmensəlɪzəm/
noun

A relationship between two species where one benefits and the other is not harmed.

A bird building a nest in a tree is an example of commensalism; the bird gets a place to live, and the tree is not hurt.
Visual representation of "commensalism" - A relationship between two species where one benefits and the other is not harmed

Often appears as...

  • example of commensalism
  • commensalism relationship

Usage tips

Academic

Definition 1 of 1
Visual representation of "commensalism"
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Not Mutualism

Distinguish 'commensalism' from 'mutualism', where both species benefit.

Illustration for Not Mutualism
Though often confused, commensalism is not mutualism as only one organism benefits.
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One-way Benefit

The word emphasizes the one-sided benefit without any harm to the other party.

Illustration for One-way Benefit
Commensalism offers a one-way benefit, such as a remora fish riding on a shark.
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No Negative Impact

Understand that 'harm' implies negative impact, which does not occur in commensalism.

Illustration for No Negative Impact
The whale isn't affected by the barnacles' presence; it's commensalism.
Visual representation of the word "Commensalism"

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