Long term monitoring of photosystem II herbicides: correlation with remotely sensed freshwater extent to monitor changes in the quality of water entering the Great Barrier Reef, Australia

Kennedy, Karen, Schroeder, Thomas, Shaw, Melanie, Haynes, David, Lewis, Stephen, Bentley, Christie, Paxman, Chris, Carter, Steve, Brando, Vittorio E., Bartkow, Michael, Hearn, Laurence, and Mueller, Jochen F. (2012) Long term monitoring of photosystem II herbicides: correlation with remotely sensed freshwater extent to monitor changes in the quality of water entering the Great Barrier Reef, Australia. Marine Pollution Bulletin, 65 (4-9). pp. 292-305.

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Abstract

Photosystem II (PSII) herbicides are used in large quantities on agricultural lands adjoining the Great Barrier Reef (GBR). Routine monitoring at 14 sites in inshore waters of the GBR using passive sampling techniques detected diuron (32–94% of sampling periods) at maximum concentrations of 1.7–430 ng L−1 in the relatively pristine Cape York Region to the Mackay Whitsunday Region, respectively. A PSII herbicide equivalent (PSII-HEq) index developed as an indicator for reporting was dominated by diuron (average contribution 89%) and typically increased during the wet season. The maximum PSII-HEq indicates the potential for photosynthetic inhibition of diatoms, seagrass and coral-symbionts. PSII herbicides were significantly positively correlated with remotely sensed coloured dissolved organic matter, a proxy for freshwater extent. Combining these methods provides for the first time the potential to cost-effectively monitor improvements in water quality entering the GBR with respect to exposure to PSII herbicides.

Item ID: 20948
Item Type: Article (Refereed Research - C1)
Keywords: passive sampling, diuron, coloured dissolved organic matter, MODIS
ISSN: 1879-3363
Date Deposited: 13 Jun 2012 02:51
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment @ 50%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050209 Natural Resource Management @ 50%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960905 Farmland, Arable Cropland and Permanent Cropland Water Management @ 50%
96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments @ 50%
Citation Count from Web of Science Web of Science 2
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