Reefs have long been known as attractors of diverse species. Now, research published in the journal "Science" indicates that reefs are also cradles of evolution, places where new species actually evolve
Art Chimes
Washington, DC 07 January 2010
Photo: David Burdick, NOAA
Goatfish (Mulloidicthys sp.) and striped damselfish (Dascyllus aruanus) swim at reef in Mariana Islands, Guam
"When we lose reefs, we lose basically the cradles of evolution in the oceans." – Wolfgang Kiessling
A new study out this week highlights the role that coral reefs play in evolution, adding another reason to preserve these delicate, diverse, and often beautiful ecosystems.
Many of the world's coral reefs are threatened by ocean acidification and pollution, among other things.
Wolfgang Kiessling of Berlin's Natural History Museum says that concerns ecologists because of the vital role reefs play in ocean ecosystems.
"They're really important to marine ecology because they host thousands of fish, for example," he said. "This is where the young fish grow up. And they host millions of species of invertebrates, and so they are ecologically really key to tropical marine ecosystems."
Julie Bedford, NOAA Reef in Fiji with great diversity of coral species
The conventional view has been that reefs attract a diverse population – in part because they have lots of nooks and crannies where fish can hide from predators – but that they aren't necessarily places where new species evolve.
Kiessling began to doubt this when he looked at the evolutionary record following the mass extinction 65 million years ago that wiped out the dinosaurs. That event signaled a slowdown in the creation of new species.
"We see that evolution slowed a bit, and this was basically – that was my guess – because so many reefs were killed as well. So it took a long time for diversity to build up again in the aftermath."
Using a vast, online catalog called the Paleobiology Database, Kiessling and his colleagues analyzed the occurrence of hundreds of thousands of new species as documented by researchers around the world.