Red coralline algae
Calliarthron sp
- On view
- Kelp Forest, Rocky Shore
- Animal type
- Plants & algaes
- Ecosystem
- Kelp forest, Rocky shore
- Relatives
- Species in the family Corallinaceae
- Diet
- Converts energy from sunlight and nutrients
- Range
- Red coralline algae can be found in most marine habitats. Articulated corallines grow mostly in low intertidal and subtidal coastal areas. Crustose corallines have been found in depths up to 500 feet (152 m).
- Size
- Most articulated corallines are less than 8 inches (20.3 cm) tall; crustose corallines grow up to 1/4 inch (6.3 mm) thick
About red coralline algae
Since these algae deposit calcium carbonate (limestone) in most of their cell walls, red corallines have the appearance and rough texture of coral. Grazing on these calcified algae would be like eating marble, so most hungry herbivores feed elsewhere.
Did you know?
Coralline algae take two different forms. Articulated species grow upright and have "branches" with flexible, uncalcified joints that withstand strong water motion. Crustose species encrust mostly on rocks, although they may also grow on plants or animals. All the different kinds of crustose algae cover more surface area than any algae species in the world.
Conservation
Seaweeds—like the coralline algae—live in many ocean habitats. To protect seaweed species, we must learn more about the habitats they depend on and how we can preserve and protect their ocean homes. For instance, red articulated corallines growing in intertidal zones are vulnerable to trampling and other damage, so it's important to tread carefully when you visit tide pools.
Cool facts
- Since calcification—the process that makes these plants hard—takes a lot of energy, corallines grow slowly. An eight-inch articulated coralline may be more than nine years old.
- Most seaweed grazers shun these stony red algae. However, a few animals with special hardened mouth parts—like juvenile abalone, some marine snails and a chiton species (Tonicella lineata)—actually prefer to munch on corallines.
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