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Rhodolith

Lithothamnion sp.

While at first glance rhodoliths have a similar appearance to coral, rhodoliths are in fact red algae (seaweed). Corals are animals that collect plankton and other organisms from the water for food whereas rhodoliths, like other algae, produce energy through photosynthesis.

 

Rhodoliths do not attach themselves to the seabed and instead grow as free-living balls, branched twigs, or rosettes.

 

They are known to occur from tropical to polar waters and can form extensive colourful beds. These beds typically occur in environments where the waves and currents are strong enough to prevent burial from sediment, but not so high as to cause destruction.

 

Rhodolith beds support a rich diversity of soft and hard bottom invertebrates. If you look closely you can often find smaller creatures hiding inside to protect themselves from predators. Can you spot any creatures?


Fun Fact!

Coralline algae like rhodoliths have been used in bone grafts and dental implants.

Habitat & Range

Found in tropical to polar waters, preferring areas with moderate currents to prevent burial.

Lifespan & Growth

They are incredibly long-lived often more than100 years and have remarkably low growth rates (typically less than 1 mm a year).

Role in Ecosystem

Provides habitat for small marine creatures and stabilizes reefs.

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