Atrazine fate and transport within the coastal zone in southeastern Puerto Rico |
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| Institution: | 1. USDA-ARS, Southeast Watershed Laboratory, Tifton, GA 31793, United States;2. Jobos Bay National Estuarine Research Reserve, Aguirre, PR 00704, United States;3. NOAA National Centers for Coastal Ocean Science, Silver Spring, MD 20910, United States;1. School of Geographical and Oceanographic Sciences, Nanjing University, Nanjing, Jiangsu 210093, PR China;2. Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;3. NOAA/NOS, Marine Biotoxins Program, 219 Fort Johnson Road, Charleston, SC 29412, USA;4. State Key Laboratory in Marine Pollution, Research Centre for the Oceans and Human Health, City University of Hong Kong, Hong Kong Special Administrative Region;5. Fisheries Division, Ministry of Fisheries & Marine Resources Development, Republic of Kiribati;1. Palau International Coral Reef Center, 1 M-Dock Road, P.O. Box 7086, Koror 96940, Palau;2. Bureau of Arts and Culture, P.O. Box 100, Koror 96940, Palau;3. United Nations Joint Presence (GEF-SGP), Suite 301, 3rd Flr. Surangel Building, Koror 96940, Palau;4. Palau Automated Land and Resource System, P.O. Box 100, Koror 96940, Palau;5. The Nature Conservancy, Palau Field Office, P.O. Box 1738, Koror 96940, Palau;1. Coastal Watershed Institute, Florida Gulf Coast University, 10501 FGCU Blvd South, Fort Myers, FL 33965, United States;2. Louisiana Universities Marine Consortium, Chauvin, LA 70344, United States;3. Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, United States;1. University Corporation for Atmospheric Research, Joint Office for Science Support, Visiting Scientist at Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 2725 Montlake Blvd. E., Seattle, WA 98112, USA;2. Environmental and Fisheries Sciences Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 2725 Montlake Blvd. E., Seattle, WA 98112, USA;3. University of Washigton, under contract to Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 2725 Montlake Blvd. E., Seattle, WA 98112, USA;4. University of Washington Tacoma, Campus Box 358400, 1900 Commerce St., Tacoma, WA 98402, USA;5. Woods Hole Oceanographic Institution, MS#32, Woods Hole, MA 02543, USA;1. College of Marine Science, University of South Florida, 140 Seventh Ave. S., St. Petersburg, FL, 33701, USA;2. Department of Biological Sciences, University of South Florida St. Petersburg, 140 Seventh Ave. S., St. Petersburg, FL, 33701, USA;3. College of The Arts, University of South Florida, 4202 E. Fowler Ave., Tampa, FL, 33620, USA |
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| Abstract: | Agrichemical transport to coastal waters may have adverse ecological impact. This work examined atrazine fate and transport in a field adjacent to Puerto Rico’s Jobos Bay National Estuarine Research Reserve. The herbicide’s use was linked to residue detection in shallow groundwater and movement toward the estuary; however, data indicated that transport via this pathway was small. In contrast, surface runoff as tropical storm systems moved through the area appeared to have high potential for atrazine transport. In this case, transport to the estuary was limited by runoff event timing relative to atrazine application and very rapid atrazine dissipation (DT50 = 1–3 days) in field soil. Soil incubation studies showed that accelerated degradation conditions had developed in the field due to repeated atrazine treatment. To improve weed management, atrazine replacement with other herbicide(s) is recommended. Use of products that have greater soil persistence may increase runoff risk. |
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