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Additive Pressures of Elevated Sea Surface Temperatures and Herbicides on Symbiont-Bearing Foraminifera

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dc.contributor Ufz Helmholtz Center For Environmental Research
dc.contributor Australian Institute Of Marine Science
dc.contributor Helmholtz Association
dc.contributor Helmholtz Center For Environmental Research (ufz)
dc.contributor Natl Res Ctr Environm Toxicol
dc.contributor Univ Queensland
dc.contributor Ufz Helmholtz Ctr Environm Res
dc.contributor Sch Biol Sci
dc.contributor Dept Bioanalyt Ecotoxicol
dc.contributor Australian Inst Marine Sci
dc.contributor University Of Queensland
dc.contributor Australian Institute Of Marine Science (aims) en UTHICKE, SVEN VAN DAM, JOOST W. NEGRI, ANDREW P. MUELLER, JOCHEN F. ALTENBURGER, ROLF 2013-02-28T06:53:16Z 2017-03-21T01:26:21Z 2017-03-21T01:26:21Z 2019-10-21T21:39:27Z 2013-02-28T06:53:16Z 2017-03-21T01:26:21Z 2017-03-21T01:26:21Z 2019-10-21T21:39:27Z 2012-03-16
dc.identifier 9034 en
dc.identifier.citation van Dam J, Negri AP, Mueller JF, Altenburger R and Uthicke S (2012) Additive pressures of elevated sea surface temperatures and herbicides on symbiont-bearing foraminifera. PLoS ONE. 7: e33900. en
dc.identifier.issn 1932-6203
dc.description.abstract Elevated ocean temperatures and agrochemical pollution individually threaten inshore coral reefs, but these pressures are likely to occur simultaneously. Experiments were conducted to evaluate the combined effects of elevated temperature and the photosystem II (PSII) inhibiting herbicide diuron on several types of symbiotic algae (diatom, dinoflagellate or rhodophyte) of benthic foraminifera in hospite. Diuron was shown to evoke a direct effect on photosynthetic efficiency (reduced effective PSII quantum yield Delta F/F-m'), while elevated temperatures (>30 degrees C, only 2 degrees C above current average summer temperatures) were observed to impact photosynthesis more indirectly by causing reductions in maximum PSII quantum yield (F-v/F-m), interpreted as photodamage. Additionally, elevated temperatures were shown to cause bleaching through loss of chlorophyll a in foraminifera hosting either diatoms or dinoflagellates. A significant linear correlation was found between reduced F-v/F-m and loss of chlorophyll a. In most cases, symbionts within foraminifera proved more sensitive to thermal stress in the presence of diuron (>= 1 mu g L-1). The mixture toxicity model of Independent Action (IA) described the combined effects of temperature and diuron on the photosystem of species hosting diatoms or dinoflagellates convincingly and in agreement with probabilistic statistics, so a response additive joint action can be assumed. We thus demonstrate that improving water quality can improve resilience of symbiotic phototrophs to projected increases in ocean temperatures. As IA described the observed combined effects from elevated temperature and diuron stress it may therefore be employed for prediction of untested mixtures and for assessing the efficacy of management measures.
dc.description.sponsorship This research was supported by the Australian Government's Marine and Tropical Sciences Research Facility (MTSRF)( JvD received financial support from The University of Queensland ( The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
dc.language en en
dc.language English
dc.relation.ispartof Null
dc.relation.ispartof PLoS ONE - pages: 7: e33900 en
dc.subject Coral Porites-cylindrica
dc.subject Great-barrier-reef
dc.subject Photosynthetic Electron-transport
dc.subject Larger Foraminifera
dc.subject Algal Symbionts
dc.subject Exposure
dc.subject Responses
dc.subject Photoinhibition
dc.subject Heat-stress
dc.subject Amphistegina-gibbosa
dc.subject Climate-change
dc.subject Multidisciplinary Sciences
dc.subject Water-quality
dc.subject Benthic Foraminifera
dc.subject Coral-reefs
dc.subject Science & Technology - Other Topics
dc.subject Building Corals
dc.subject Photosystem-ii
dc.title Additive Pressures of Elevated Sea Surface Temperatures and Herbicides on Symbiont-Bearing Foraminifera
dc.type journal article en
dc.identifier.doi 10.1371/journal.pone.0033900
dc.identifier.wos WOS:000303309100112

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