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Herbicides: A new threat to the Great Barrier Reef
Authors:Stephen E Lewis  Jon E Brodie  Zoë T Bainbridge  Ken W Rohde  Aaron M Davis  Bronwyn L Masters  Mirjam Maughan  Michelle J Devlin  Jochen F Mueller  Britta Schaffelke
Institution:1. CSIRO, Brisbane, Queensland 4068, Australia;2. School of Geography, Planning and Environmental Management, University of Queensland, St Lucia, Brisbane 4072, Australia;3. GeoSciences, Southern Cross University, Lismore, NSW, Australia;4. Australian River Institute, Griffith University, Brisbane, Australia;5. CSIRO, Townsville, Australia;1. Queensland Alliance for Environmental Health Sciences (QAEHS), The University of Queensland, 20 Cornwall St, Woolloongabba, Qld 4102, Australia;2. Institute for Environmental Research, RWTH Aachen University, Germany;3. Norwegian Institute for Water Research (NIVA), Oslo, Norway;1. Gimix B.V. Postbus 7500, 5600 AT Eindhoven, the Netherlands;2. CSIRO Ecosystem Sciences, PO Box 2583, Brisbane, QLD 4001, Australia;3. CESAM and Department of Environment and Planning, University of Aveiro, Campus Universitário de Santiago, Aveiro 3810-193, Portugal;4. CSIRO Ecosystem Sciences, PO Box 12139, Earlville, QLD 4870, Australia;5. CSIRO Ecosystem Sciences, PO Box 284, Canberra, ACT 2601, Australia;6. Department of Agriculture and Fisheries, PO Box 1252, Ingham, QLD 4850, Australia;7. School of Agricultural and Resource Economics, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;8. Czech University of Life Sciences Prague, Faculty of Environmental Sciences, Prague 165 21, Czech Republic
Abstract:The runoff of pesticides (insecticides, herbicides and fungicides) from agricultural lands is a key concern for the health of the iconic Great Barrier Reef, Australia. Relatively low levels of herbicide residues can reduce the productivity of marine plants and corals. However, the risk of these residues to Great Barrier Reef ecosystems has been poorly quantified due to a lack of large-scale datasets. Here we present results of a study tracing pesticide residues from rivers and creeks in three catchment regions to the adjacent marine environment. Several pesticides (mainly herbicides) were detected in both freshwater and coastal marine waters and were attributed to specific land uses in the catchment. Elevated herbicide concentrations were particularly associated with sugar cane cultivation in the adjacent catchment. We demonstrate that herbicides reach the Great Barrier Reef lagoon and may disturb sensitive marine ecosystems already affected by other pressures such as climate change.
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