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Re: Coral turns white, dies around Japanese islands
infoshark - 06.08.2007, 11:31Coral turns white, dies around Japanese islands
Coral turns white, dies around Japanese islands
TOKYO — Large swaths of coral off islands around Okinawa Prefecture have been turning white because of a phenomenon known as coral bleaching — a sign the coral is dying.
This phenomenon has been sighted for the first time in four years in locations in the prefecture such as the coast around Ishigakijima island, which boasts the country's largest coral reef, and is thought to have been brought on by high water temperatures in July.
Should the water temperature stay high in August, it is feared more coral will be destroyed than ever before — surpassing the case in 1998, when about 40 percent of the coral around Ishigakijima died.
The Environment Ministry has begun investigating the situation.
According to information supplied by the ministry and experts, the bleaching has been confirmed around Ishigakijima and in locations such as the sea off Sesokojima island near Okinawa.
Kenji Ohori, 40, an Ishigakijima coral reef tour guide, said he had confirmed Tuesday that most of a reef stretching from Yonehara beach on the north of the island to a point far out into the ocean had turned completely white.
He added that part of the reef had already died and had seaweed stuck to it and some dead fish and sea cucumbers around it.
Coral bleaching happens when the sea temperature stays above 86 degrees for days at a time.
It has occurred three times before in Okinawa Prefecture — in 1998, 2001 and 2003. On these three occasions the bleaching was spotted in September, making this year the earliest it has started.
Average daily air temperatures of more than 86 degrees were recorded for a record 32 days in June and July on the island, according to Mineo Okamoto, an associate professor at Tokyo University of Marine Science and Technology.
The Okinawa Local Meteorological Observatory forecast the hot weather to continue throughout August.
Quelle: azstarnet
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