From New Scientist:
Coral reefs have generated more new kinds of animal than all other marine habitats put together. So concludes an analysis of the earliest fossils of more than 6000 sea-floor invertebrates, which found that reefs "gave birth" to close to 6 in 10 of the groups studied.
Coral reefs house a striking number and variety of organisms. Debate has raged since the 1970s over whether they provide the ideal conditions for new species to emerge or simply attract them from other habitats. Until now, the latter argument has tended to prevail.
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