پديد آورندگان :
Imo T. S. نويسنده , Oomori T. نويسنده , Miyagi T. نويسنده , Sheikh M. A. نويسنده , Fujimura H. نويسنده , HIGUCHI T. نويسنده
چكيده لاتين :
Coral reefs are deteriorating worldwide due to various stresses, including pollution of hazardous
chemicals such as antifouling chemicals. Occurrence and impacts of a new antifouling biocide Irgarol-1051 (2-methylthio-
4-tert- butylamino -6-cyclopropylamino -s-triazine) have been studied in coral reef waters around Okinawa Islands,
Japan. The average concentration of Irgarol detected at commercial and fisheries Ports was 24.70 ± 9.88 ng/L. In Naha
Bay, the average concentration of Irgarol was 10.00±12.98 ng/L. The average level detected around the Ports has already
approaches the environmental risk limit for the marine organisms. Irgarol was detected in waters at the frequency of
92.3 % (24/26) of the total samples collected during two sampling campaigns (September and December, 2007) at the
Ports. In Naha Bay, Irgarol was detected by 40.5 % (17/42) of the total water samples collected monthly from Sep.,
2007 to Feb., 2008, indicating that Irgarol is widely detected along the coastal shorelines of Okinawa Island. The ecotoxicological
study revealed that the rate of photosynthesis in the coral Galaxea fascicularis was significantly reduced
by 18 % and 121 % relative to control when the corals were exposed to 1000 and 10,000 ng/L of Irgarol, respectively.
The calcification rate dropped by 98.3 % relative to control when the corals were exposed to 10,000 ng/L of Irgarol. The
results of the present study report the wide occurrence of new antifouling biocide Irgarol around coastal areas of
Okinawa Island. However, the contamination does not pose serious threat on the photosynthesis and calcification of
corals under short term exposure (96 h).