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Honduran earthquake of 2009 destroyed half of coral reefs of Belizean Barrier Reef lagoon
Date:9/12/2011

ere aggravated by global climate change, caused mass coral bleaching, lettuce coral disappeared. An encrusting sponge (Chondrilla caribensis) colonized its skeletal remains, along with seaweed. What's astonishing about this series of events, say the authors, is thatas evidenced by radiocarbon-dating of reef coresstaghorn coral had dominated the reefs for nearly 4,000 years.

"The prior losses of both staghorn and lettuce corals drastically weakened the resilience of the coral assemblages on the reef slopes," says lead author Aronson. "In other words, if neither white-band disease nor bleaching had occurred, staghorn coral might have continued its millennial-scale dominance of the areas not destroyed by the quake."

The authors project that recovery to a coral-dominated state is unlikely in the near future, because corals in the undamaged areas had been killed previously. The situation is unlikely to change unless the way we manage reef resources improves dramatically.

Marine protected areas are meant to sustain an area's ecological, cultural, and economic benefits for future generations. Yet creating and managing these areas is easier said than done. Aronson and colleagues contend that extreme events, such as earthquakes, lava flows, and tsunamis, should be taken into account when determining the size of and managing such protected areas.

"The rhetoric of conservation often includes the appeal of preserving ecosystems so that our children's children can enjoy Nature's bounty," says Aronson. "That translates to about 200 years, but ecosystems last far longer than three generations of their human stewards. We challenge marine conservationists to plan on a millennial scale. Rare, catastrophic events are the backdrop to human actions. Those rare events should be factored into determining the sizes of marine reserves and their levels of protection, whatever else might be expected to happen along the way. After all, a once-
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Contact: Nadine Lymn
nadine@esa.org
202-833-8773
Ecological Society of America
Source:Eurekalert

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