In Coral Reefs: Bubble Corals

Bubble corals can be found in many shallow reefs across the globe. During the day-time, the polyps fill with water and expand (as they are in the image) forming 'bubbles', and deflate at night-time when they put their tentacles out to capture food. This guy gets most of his nutrition from a symbiotic relationship with small, single-celled plankton (dinoflagellates), but also can capture other planktonic organisms via its polyps. Bubble corals are rather aggressive, and will use its long sweeper tentacles to sting many animals that come close to it. Bubble corals can be threatened by other corals invading its habitat, and of course is sensitive to environmental changes (as are many reef invertebrates), and thus carries the status of 'near-threatened'. .......................................................................... #science #nature #animals #education #coral

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