The influence of irradiance on tolerance to high and low temperature stress exhibited by Symbiodinium in the coral, Pocillopora damicornis, from the high-latitude reef of Lord Howe Island

Wicks, LC; Hill, R; Davy, S

The influence of irradiance on tolerance to high and low temperature stress exhibited by Symbiodinium in the coral, Pocillopora damicornis, from the high-latitude reef of Lord Howe Island

Wicks, LC Hill, R Davy, S

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Publisher:: Amer Soc Limnology and Oceanography
Publication Type:: Journal Article
Citation:: Limnology and Oceanography, 2010, 55 (6), pp. 2476 - 2486
Issue Date:: 2010-01

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Field	Value	Language
dc.contributor.author	Wicks, LC	en_US
dc.contributor.author	Hill, R	en_US
dc.contributor.author	Davy, S	en_US
dc.date.issued	2010-01	en_US
dc.identifier.citation	Limnology and Oceanography, 2010, 55 (6), pp. 2476 - 2486	en_US
dc.identifier.issn	0024-3590	en_US
dc.identifier.uri	http://hdl.handle.net/10453/13156
dc.description.abstract	The coral Pocillopora damicornis hosts genetically distinct and novel types of dinoflagellate symbionts at the high-latitude site of Lord Howe Island (LHI), yet why these novel types exist at this marginal site is unknown. In this study, it was detennined whether one of the novel Symbiodinium types at LHI is phy~iologically adapted for this high-latitude site, where water temperatures annually range from 18°C to 26°e. Low and high short-tenn thennal bleaching thresholds of the coral-symbiont partnership were measured as 14°C and 30°e. PhotochEmical sensitivity to temperature (15°C and 29°C) and light treatments (100% and 40% of sunlight), measured as effective_ quantum yie1d and fast induction curves, were detennined over a 72-h period. A greater effect on the photochemical reactions of LHI P. damicornis symbionts was recorded in response to a 3°e temperature increase from annual maxima than a 3°e temperature decrease from annual minima. Corals did not bleach when temperature was reduced to 15°e for 72 h; in contrast, a 92% decline in photochemical efficiency was recorded in the 29°C treatment (AF: F~ < 0.05), compared to 35% loss in the control (20°C). For the first time, a Pulse Efficiency Analyser fluorometer was used to assess the effect of reduced temperature on symbionts, showing a reduced rate of QA reduction, further enhanced by high light levels. This type of Symbiodinium at LHI may be specialized for cooler and more variable temperatures, so contributing to the success of corals at this marginal location.	en_US
dc.publisher	Amer Soc Limnology and Oceanography	en_US
dc.relation.ispartof	Limnology and Oceanography	en_US
dc.relation.isbasedon	10.4319/lo.2010.55.6.2476	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	The influence of irradiance on tolerance to high and low temperature stress exhibited by Symbiodinium in the coral, Pocillopora damicornis, from the high-latitude reef of Lord Howe Island	en_US
dc.type	Journal Article
utslib.citation.volume	6	en_US
utslib.citation.volume	55	en_US
utslib.for	0405 Oceanography	en_US
utslib.for	04 Earth Sciences	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	open_access
pubs.consider-herdc	true	en_US
pubs.issue	6	en_US
pubs.volume	55	en_US

Abstract:

The coral Pocillopora damicornis hosts genetically distinct and novel types of dinoflagellate symbionts at the high-latitude site of Lord Howe Island (LHI), yet why these novel types exist at this marginal site is unknown. In this study, it was detennined whether one of the novel Symbiodinium types at LHI is phy~iologically adapted for this high-latitude site, where water temperatures annually range from 18°C to 26°e. Low and high short-tenn thennal bleaching thresholds of the coral-symbiont partnership were measured as 14°C and 30°e. PhotochEmical sensitivity to temperature (15°C and 29°C) and light treatments (100% and 40% of sunlight), measured as effective_ quantum yie1d and fast induction curves, were detennined over a 72-h period. A greater effect on the photochemical reactions of LHI P. damicornis symbionts was recorded in response to a 3°e temperature increase from annual maxima than a 3°e temperature decrease from annual minima. Corals did not bleach when temperature was reduced to 15°e for 72 h; in contrast, a 92% decline in photochemical efficiency was recorded in the 29°C treatment (AF: F~ < 0.05), compared to 35% loss in the control (20°C). For the first time, a Pulse Efficiency Analyser fluorometer was used to assess the effect of reduced temperature on symbionts, showing a reduced rate of QA reduction, further enhanced by high light levels. This type of Symbiodinium at LHI may be specialized for cooler and more variable temperatures, so contributing to the success of corals at this marginal location.

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http://hdl.handle.net/10453/13156