期刊
MARINE POLLUTION BULLETIN
卷 44, 期 7, 页码 623-632出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0025-326X(01)00303-4
关键词
Irgarol 1051; antifouling paints; corals; Madracis mirabilis; photosynthesis; inhibition
International regulation of organotin compounds for use in antifouling paints has led to the development and increased use of replacement Compounds, notably the s-triazine herbicide Irgarol 1051, Little is known about the distribution of Irgarol 1051 in tropical waters. Nor has the potential impact of this triazine upon photosynthesis of endosymbiotic microalgae (zooxanthellae) in corals been assessed. In this study Irgarol 1051 was detected in marinas, harbours and coastal waters of the Florida Keys, Bermuda and St. Croix, with concentrations ranging between 3 and 294 ng l(-1). C-14 incubation experiments with isolated zooxanthellae from the common inshore coral Madracis mirabilis showed no incorporation of (HCO(3) over bar)-C-14 from the sea water medium after 4-8 h exposure to Irgarol 1051 concentrations as low as 63 ng l(-1). Reduction in net photosynthesis of intact corals was found at concentrations of 100 ng l(-1) with little or no photosynthesis at concentrations exceeding 1000 ng l(-1) after 2-8 h exposure at all irradiances. The data suggest Irgarol 1051 to be both prevalent in tropical marine ecosystems and a potent inhibitor of coral photosynthesis at environmentally relevant concentrations, (C) 2002 Elsevier Science Ltd. All rights reserved.
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