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Reef devastation caused Crown-of-thorns outbreaks still a mystery to researchers17/02/2013 22:57:53The adult crown-of-thorns is a carnivorous predator that usually preys on reef coral polyps. © IRD / E. Folcher Researchers tackle the coral-killing starfish February 2013. Crown-of-thorns Acanthaster planci is the principle natural enemy of reef-building corals. Outbreaks of this coral-feeding starfish occur periodically, due to reasons that remain unclear. It decimates entire reefs in the space of just a few years, as has been the case in French Polynesia since 2004. A new study conducted by IRD researchers and their partners describes this population explosion around Moorea, the "sister island of Tahiti". The rate of living coral cover in ocean depths and lagoons alike dropped from 50% (healthy reef) to under 5% in 2009. The ecosystem will need at least a decade to be restored to its original state. The starfish has spread from island to island Ocean depths and lagoons alike The causes remain unclear - High rainfall is an indicator Since the causes of outbreaks remain unclear, there is limited ability to fight against Acanthaster planci in order to protect economic activities around the coral barrier, such as tourism and diving. Researchers are currently studying processes to "recruit" new corals, in other words to repopulate the reef and make it more resilient. Without a new widespread disturbance, a coral ecosystem would need 10 to 30 years to be restored to its original state. A Porites coral head is brunch for a palm-sized sea star. With its toxin laden spikes, natural toughness and incredible reproductive capabilities, the Crown-of-Thorns Seastar is a perfect coral predator. (Kurt Domingo)
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