Decorator crab and sponge relationship quizzes


decorator crab and sponge relationship quizzes

An art project to show the relationship between coral and Coral Feeding Quiz. • Coral: What Decorator crabs get their name from what they do with sponges. Crab and Sponges Symbiotic Relationship URLhttps://marinelifeindia. Website. There are 3 main types of symbiotic relationships amongst reef dwellers, including ones that involve After reading these, you can test your knowledge by taking the symbiosis quizzes. NOTE sponge brittle star Ophiothrix sp. Well, the dive leader seems to think the decorator crab in the gorgonian as an example of.

While decorator crabs move on top of a sponge colony, they camouflage perfectly and are totally concealed from predators. Front view where eyes and antennae can be seen Another important species of sponge decorator crab is Hyastenus elatus.

This variety shows worldwide distribution but its diversity is more in the Indo-Pacific region. For Composcia sp, the pincers or the claw is the only place devoid of any sponge attached! The presence of decorator crabs is often unnoticed during the day time because they prefer to hide in crevices or holes in coral reefs.

  • Elephant ear sponge

However, the species is very active during the night and towards dawn and dusk when illumination is less. Decorator crabs are carnivorous, feeding on a wide diversity of organic matter and marine fauna. They hunt down their invertebrate prey during the night time.

Symbiotic Relationship Between Crabs & Sponges by Keith Matthews on Prezi

The attachments found on decorator crabs play a dual role. It aids in easy concealment and at the same time, due to the distasteful nature of sponges this is because of the presence of some metabolitespredators dislike coming near the sponge decorator crab. Presence of hydroids in the body of some decorator crabs gives a sting to the predator. For example, if you find one organism living on or with another, the first question to ask is, "Is one participant gaining benefit, but harming the other?

decorator crab and sponge relationship quizzes

If so, the relationship is a parasitism. The next question is, "Is one participant gaining benefit with no harm to the other?

BCCR: Symbioses

If so, the relationship is a commensalism. Finally, "Are both participants benefitting? If so, the relationship is a mutualism. This sounds simple, but in practise it is often difficult to determine benefit and harm. A barnacle on a crab shell benefits from being provided a place to stay, but what about the crab?

decorator crab and sponge relationship quizzes

If it truly is not harmed by the barnacle's presence, then it is a commensalism. However, if there are costs, no matter how seemingly small, such as for the crab to support the mass of the barnacle and to counteract the increased drag forces it creates in a current, then it is parasitism.


If you are a reductionist a "lumper"then you can consider them all parasitisms. If, however, you are more of a "splitter"-type person, then you may enjoy the challenge of trying to separate them out.

Incredible footage of hermit crab changing shells with anemones!

NOTE refers to organisms living together in close physical association. In North America the term does not usually indicate benefit or harm; in the U. A oft-quoted instance of inquilinism is the occupation by certain aquatic insect larvae of water contained at the bases of pitcher-plant leaves. The larvae paddle about and feed on algae within.