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Photoinhibition from chronic herbicide exposure reduces reproductive output of reef-building corals

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dc.contributor Australian Institute Of Marine Science
dc.contributor James Cook Univ N Queensland
dc.contributor Sch Marine & Trop Biol
dc.contributor James Cook University
dc.contributor Aims Jcu
dc.contributor Australian Inst Marine Sci
dc.contributor Arc Ctr Excellence Coral Reef Studies
dc.contributor Australian Institute Of Marine Science (aims) en WILLIS, BETTE L. CANTIN, NEAL E. NEGRI, ANDREW P. 2013-02-28T06:43:02Z 2013-02-28T06:43:02Z 2017-03-21T00:58:50Z 2019-07-08T02:15:19Z 2017-03-21T00:58:50Z 2017-03-21T00:58:50Z 2013-02-28T06:43:02Z 2019-07-08T02:15:19Z 2007-01-01
dc.identifier 7453 en
dc.identifier.citation Cantin N, Negri AP and Willis BL (2007) Photoinhibition from chronic herbicide exposure reduces reproductive output of reef-building corals. Marine Ecology Progress Series. 344: 81-93. en
dc.identifier.issn 0171-8630
dc.description.abstract The photosystem II (PSII) herbicide diuron is commonly used within catchments that drain into the Great Barrier Reef lagoon, where it potentially reduces photosynthesis in Symbiodinium, the dinoflagellate symbiont associated with reef corals. Here we examine the importance of energy (carbohydrates) derived from photosynthesis to the gametogenesis of corals following long-term, experimental exposures to diuron. Two broadcast spawning corals, Acropora tenuis and A. valida, and a brooding coral, Pocillopora damicornis, were exposed to 0 (controls), 1.0 (low) and 10 (moderate) mu g 1(-1) diuron treatments for 2 to 3 mo prior to spawning or planulation. Diuron caused photoinhibition in each species, with pulse amplitude modulation (PAM) fluorometery recording consistent declines in effective quantum yields of 20% at 1.0 mu g 1(-1) and 75 % at 10 mu g 1(-1) diuron compared to control corals. A, valida and P. damicornis were both sensitive to chronic diuron-induced photoinhibition, becoming severely bleached (loss of Symbiodinium spp. and/or reductions in light-harvesting pigments), especially at 10 mu g 1(-1) diuron. At this moderate concentration, A. valida sustained both partial and full colony mortality. A. tenuis was more resistant to these concentrations of diuron, and neither bleached nor sustained partial mortality in any of the treatments. We found 2.5-to 5-fold reductions in total lipid content (coral tissue, oocytes and planulae) for the 3 species in the presence of diuron, indicating significant use of storage lipid to meet nutritional demands under conditions of chronic photoinhibition. Polyp fecundity was reduced by 6-fold in A. valida and both A. valida and R damicornis were unable to spawn or planulate following long-term exposures to 10 mu g 1(-1) diuron. This is the first study to investigate the sub-lethal effects of chronic herbicide-induced photoinhibition on symbiotic corals and provides evidence of a link between reduced energy acquisition due to PSII photoinhibition and reduced reproductive output in zooxanthellate corals.
dc.language English
dc.language en en
dc.relation.ispartof Marine Ecology Progress Series - pages: 344: 81-93 en
dc.relation.ispartof Null
dc.subject Great-barrier-reef
dc.subject Ecology
dc.subject Diuron
dc.subject Pigment
dc.subject Flexibility
dc.subject Growth
dc.subject Photosynthesis
dc.subject Acropora
dc.subject Environmental Sciences & Ecology
dc.subject Symbiosis
dc.subject Photoinhibition
dc.subject Marine & Freshwater Biology
dc.subject Pocillopora-damicornis
dc.subject Herbicide
dc.subject Zooxanthellae
dc.subject Oceanography
dc.subject Coral
dc.subject Reproduction
dc.subject Symbiodinium
dc.subject Chlorophyll
dc.title Photoinhibition from chronic herbicide exposure reduces reproductive output of reef-building corals
dc.type journal article en
dc.identifier.doi 10.3354/meps07059
dc.identifier.wos WOS:000249816300008

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