The California Sea Cucumber exhibits an escape response when approached by the Sunflower Star.
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 This mussel will no doubt have a competition for food with this barnacle. Mussels have a number of associations. |
 The whale barnacle living as a commensal on Gray Whales |
| You will find below a set of photos from our photo archives depicting two or more organisms in a biotic association. These associations fall into one of several categories: mutualism, commensalism, parasitism etc. By going through the many organisms in the Race Rocks Taxonomy, you will find explanations for these and other biotic associations. |
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| Coraline Algae and Epiactis | Boring Sponge (Cliona) and Purple- Hinged Rock Scallop (Hinnites) | Cup Coral (Balanophyllia) Epiactis and Encrusting Algae (Lithothamnion) |
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| Basket Star and soft coral |
Basket Star and sea urchin |
Abalone (Haliotis) and Lithothamnion |
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| Anthopleura xanthogramica with internal green coccoid algae | Brittle Star and Kelp Holdfast | Brittle Star |
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| Nudibranch and the orange hydroid Garveia | Swimming Scallop and Encrusting Sponge | Scallop with blue eyes |