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Combined effects of temperature and the herbicide diuron on Photosystem II activity of the tropical seagrass Halophila ovalis

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dc.contributor Australian Institute Of Marine Science
dc.contributor Climate Change Cluster C3
dc.contributor University Of Technology Sydney
dc.contributor Ctr Trop Water & Aquat Ecosyst Res Tropwater
dc.contributor Univ Technol Sydney
dc.contributor Coll Marine & Environm Sci
dc.contributor Australian Inst Marine Sci
dc.contributor James Cook Univ
dc.contributor James Cook University NEGRI, ANDREW P. WILKINSON, ADAM D. COLLIER, CATHERINE J. FLORES, FLORITA LANGLOIS, LUCAS RALPH, PETER J. 2017-04-12T05:35:47Z 2017-04-12T05:35:47Z 2019-05-09T01:22:07Z 2017-04-12T05:35:47Z 2017-04-12T05:35:47Z 2019-05-09T01:22:07Z 2017-03-30
dc.identifier.citation Wilkinson AD, Collier CJ, Flores F, Langlois L, Ralph PJ, Negri AP (2017) Combined effects of temperature and the herbicide diuron on Photosystem II activity of the tropical seagrass Halophila ovalis. Scientific Reports 7: 45404
dc.identifier.issn 2045-2322
dc.description.abstract Tropical seagrasses are at their highest risk of exposure to photosystem II (PSII) herbicides when elevated rainfall and runoff from farms transports these toxicants into coastal habitats during summer, coinciding with periods of elevated temperature. PSII herbicides, such as diuron, can increase the sensitivity of corals to thermal stress, but little is known of the potential for herbicides to impact the thermal optima of tropical seagrass. Here we employed a well-plate approach to experimentally assess the effects of diuron on the photosynthetic performance of Halophila ovalis leaves across a 25 degrees C temperature range (36 combinations of these stressors across 15-40 degrees C). The thermal optimum for photosynthetic efficiency (Delta F/F '(m)) in H. ovalis was 31 degrees C while lower and higher temperatures reduced Delta F/F '(m) as did all elevated concentrations of diuron. There were significant interactions between the effects of temperature and diuron, with a majority of the combined stresses causing sub-additive (antagonistic) effects. However, both stressors caused negative responses and the sum of the responses was greater than that caused by temperature or diuron alone. These results indicate that improving water quality (reducing herbicide in runoff) is likely to maximise seagrass health during extreme temperature events that will become more common as the climate changes.
dc.description.sponsorship This study was funded by the Australian Institute of Marine Science and the Australian Government's National Environmental Research Program and the Australian Government's National Environmental Science Programme. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. M. Adams analysed the photosynthesis-temperature response curve.
dc.language English
dc.subject Great-barrier-reef
dc.subject Atrazine
dc.subject Complex Mixture
dc.subject Stress
dc.subject Science & Technology - Other Topics
dc.subject Growth
dc.subject Multidisciplinary Sciences
dc.subject Respiration
dc.subject Zostera-marina L
dc.subject Toxicity
dc.subject Chlorophyll Fluorescence
dc.subject Photosynthetic Response
dc.title Combined effects of temperature and the herbicide diuron on Photosystem II activity of the tropical seagrass Halophila ovalis
dc.type journal article
dc.identifier.doi 10.1038/srep45404
dc.identifier.wos WOS:000397818300001

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