If you go below 200 meters, you're officially entering the deep sea. These these deeper reefs really important communities in their own right. They may provide some of those same services that gareth was talking about, so that they may actually be a source of food. And there might also be an important source of medicines and protection to islands as well.
Melvyn Bragg and guests discuss the simple animals which informed Charles Darwin's first book, The Structure and Distribution of Coral Reefs, published in 1842. From corals, Darwin concluded that the Earth changed very slowly and was not fashioned by God. Now coral reefs, which some liken to undersea rainforests, are threatened by human activity, including fishing, pollution and climate change.
With
Steve Jones
Senior Research Fellow in Genetics at University College London
Nicola Foster
Lecturer in Marine Biology at the University of Plymouth
And
Gareth Williams
Associate Professor in Marine Biology at Bangor University School of Ocean Sciences
Producer Simon Tilllotson.