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Giant Carpet Anemone

Giant carpet anemones are true masters of partnership! Their stinging tentacles keep predators at bay, while the clownfish that shelter among them gain protection and return the favor by helping the anemone thrive.

 

The giant carpet anemone is a colorful reef-dweller known for its plush, carpet-like tentacles. True to its name, it can grow over a meter (3.3 feet) across. They anchor themselves to sandy bottoms or other firm substrates in shallow, sunlit waters throughout the Indo-Pacific. While the tentacles that cover them may appear pretty, watch out — they contain venom and can deliver a painful sting! Their toxin is used both for defense from predators and to help them feed on their prey, which may include small fish, urchins, snails, crabs, shrimp, and occasionally even sea snakes. They also get their energy from a special photosynthetic algae that lives within the anemone. 

Despite their sting, sea anemones are perhaps most famous for the animals that they don’t harm: clownfish, also called anemonefish. Thanks to a protective mucus layer, clownfish can safely nestle among the tentacles and form a mutualistic relationship where both species benefit.  The anemone offers shelter and protection, while the clownfish boost nutrient exchange and oxygen flow around their host. For some giant anemones, the presence of clownfish has even been linked to anemones growing larger!

 

 

Climate change can pose a threat to giant sea anemones, as rising ocean temperatures can lead to bleaching — much like coral bleaching. This leads to the algae that live within the anemone to be expelled, robbing it of some of its energy and potentially leading to death. Bleaching also can impact the clownfish that live amongst the anemone.

 

 

As climate change leads to rising ocean temperatures and changing conditions, this can increase the stress and possible mortality of anemones, as well as corals and sponges that they live beside. Oceana campaigns to tackle climate change by stopping the expansion of offshore drilling — a major contributor to the crisis.  

 

 

  • Animal Diversity Web 
  • Kashimoto R, Rickards E, Khalturin K, and Laudet V. (2024). Giant sea anemones. Current Biology 34: R481-R483. https://doi.org/10.1016/j.cub.2024.03.060 
  • Ong EJ. and Low LJQ. (2024) Prey capture by carpet anemones, Stichodactyla haddoni. Nature in Singapore, 17: e2024072. DOI: 10.26107/NIS-2024-0072 
  • Villano JH, O’Connell CW, and Clark RF. (2015) Prolonged, reversible neurologic symptoms after carpet sea anemone envenomation in a pet store worker. Clinical Toxicology, 53:137. https://doi.org/10.3109/15563650.2014.1001517 

 

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