21. These patches of pink " paint " are actually living algae : crustose coralline red algae. 22. Algal ridges are carbonate frameworks constructed mainly by nongeniculate coralline algae ( after Adey 1978 ). 23. It is also the name of a Oxfordian Coralline Oolite Formation of North Yorkshire, England. 24. The relationship between the limpet and this coralline alga could be considered a form of mutualism. 25. Both the coralline alga and the seaweeds are grazed by the pear limpet and other herbivores. 26. There was an initial period of relatively slow growth while the starfish were feeding on coralline algae. 27. These skeletons persist, together with the mass of coralline algae that is essential for reef integrity. 28. Algae, including beneficial types such as coralline algae, were viewed negatively and were generally removed. 29. Coralline algae are especially important in reef construction, as they lay down calcium carbonate as calcite.30. Coralline rock also functions as building stones, with the best examples being in Vienna, Austria.
