One example of a symbiotic relationship of a snail is when the snail abandons its shell. The shell is picked up and used by a hermit crab. This type of symbiotic. Unlike most crustations, hermit crabs do not make their own shells. Instead, they use the abandonned snail shells. Hermit crabs usually live in. 2 HERMIT CRAB AND SNAIL SHELL 2 The hermit crab will find an empty snail shell and occupy it. If it outgrows it, it will find another. Mutualism, Commensalism .
Reef-building hard corals harbour in their tentacles, microscopic single-celled algae called zooxanthellae.
Relationship Between Hermit Crabs & Sea Anemones
The algae undergo photosynthesis to produce food from sunlight. The food produced is shared with the coral polyps, which in return provides the algae with shelter and minerals.
This arrangement allows hard corals to build reefs that in turn form the basis of shelter and food for the vast variety of reef life. Many other animals have a similar arrangement with zooxanthallae, including giant clamscarpet anemones and some sponges.
Tiny transparent shrimps about 1cm are sometimes seen among the Carpet anemone's tentacles. It is not certain how they avoid being stung by the tentacles.
The shrimps find refuge and in turn, they may help keep the Carpet anemone clean. A similar arrangement is found between anemonefishes and sea anemones.
In commensalism, one living thing benefits at no expense or gain to the other. Tiny brittle stars may find shelter inside a sponge. While the brittle stars enjoy a continuous flow of food and oxygen, it probably makes no difference to the sponge. The anemone also extends its stinging tentacles out as additional protection. A hermit crab is less likely to be eaten by a larger predator fish if he has an anemone onboard.
Symbiosis on the Shores of Singapore
Food So what does the sea anemone get in return for protecting the hermit crab? Since the sea anemone will eat just about anything in the sea, it gets to eat whatever tidbits the hermit crab leaves behind.
The hermit crab does the work of capturing dinner and the sea anemone cleans up the leftovers. The symbiotic relationship between the crab and the whelk which provided its shell seems more aptly described by that term as described I is confused Yes, as you say, the relationship between hermit crabs and their sea anemones does seem to be an example of mutualism rather than commensalism, going by Wikipedia's definitions here: Commensalism, in ecology, is a class of relationships between two organisms where one organism obtains food or other benefits from the other without affecting it.
This is in contrast with mutualism, in which both organisms benefit from each other, amensalism, where one is harmed while the other is unaffected, and parasitism, where one benefits while the other is harmed. A peer reviewed paper here describes the relationship as "facultative mutualism": Living organisms have complex interrelations, which, when referring to close associations between two species, are defined using the generic term symbiosis Henry One of the most common cases of symbiosis in marine ecosystems is between cnidarians and hermit crabs Decapoda: