Physiological and Morphological Responses of the Temperate Seagrass Zostera muelleri to Multiple Stressors: Investigating the Interactive Effects of Light and Temperature

York, P; Gruber, R; Hill, R; Ralph, P; Booth, D; Macreadie, P

Physiological and Morphological Responses of the Temperate Seagrass Zostera muelleri to Multiple Stressors: Investigating the Interactive Effects of Light and Temperature

York, P Gruber, R Hill, R Ralph, P Booth, D Macreadie, P

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Publisher:: Public library of Science
Publication Type:: Journal Article
Citation:: York, Paul et al. 2013, 'Physiological and Morphological Responses of the Temperate Seagrass Zostera muelleri to Multiple Stressors: Investigating the Interactive Effects of Light and Temperature', PLoS One, vol. 8, no. 10, pp. e76377-e76377.
Issue Date:: 2013

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Field	Value	Language
dc.contributor.author	York, P	en_US
dc.contributor.author	Gruber, R	en_US
dc.contributor.author	Hill, R	en_US
dc.contributor.author	Ralph, P	en_US
dc.contributor.author	Booth, D	en_US
dc.contributor.author	Macreadie, P	en_US
dc.date.accessioned	2014-04-14T02:45:55Z
dc.date.available	2014-04-14T02:45:55Z
dc.date.issued	2013	en_US
dc.identifier	2012007201	en_US
dc.identifier.citation	York, Paul et al. 2013, 'Physiological and Morphological Responses of the Temperate Seagrass Zostera muelleri to Multiple Stressors: Investigating the Interactive Effects of Light and Temperature', PLoS One, vol. 8, no. 10, pp. e76377-e76377.	en_US
dc.identifier.issn	1932-6203	en_US
dc.identifier.other	C1	en_US
dc.identifier.uri	http://hdl.handle.net/10453/26508
dc.description.abstract	Understanding how multiple environmental stressors interact to affect seagrass health (measured as morphological and physiological responses) is important for responding to global declines in seagrass populations. We investigated the interactive effects of temperature stress (24, 27, 30 and 32?C) and shading stress (75, 50, 25 and 0% shade treatments) on the seagrass Zostera muelleri over a 3-month period in laboratory mesocosms. Z. muelleri is widely distributed throughout the temperate and tropical waters of south and east coasts of Australia, and is regarded as a regionally significant species. Optimal growth was observed at 27?C, whereas rapid loss of living shoots and leaf mass occurred at 32?C. We found no difference in the concentration of photosynthetic pigments among temperature treatments by the end of the experiment; however, up-regulation of photoprotective pigments was observed at 30?C. Greater levels of shade resulting in high photochemical efficiencies, while elevated irradiance suppressed effective quantum yield (?F/FM?). Chlorophyll fluorescence fast induction curves (FIC) revealed that the J step amplitude was significantly higher in the 0% shade treatment after 8 weeks, indicating a closure of PSII reaction centres, which likely contributed to the decline in ?F/FM? and photoinhibition under higher irradiance. Effective quantum yield of PSII (delta F/FM?) declined steadily in 32?C treatments, indicating thermal damage	en_US
dc.publisher	Public library of Science	en_US
dc.relation.ispartof	Verified OK	en_US
dc.relation.ispartof	PLoS One	en_US
dc.relation.isbasedon	http://dx.doi.org/10.1371/journal.pone.0076377	en_US
dc.subject.classification	Ecology	en_US
dc.title	Physiological and Morphological Responses of the Temperate Seagrass Zostera muelleri to Multiple Stressors: Investigating the Interactive Effects of Light and Temperature	en_US
dc.type	Journal article
utslib.citation.volume	8	en_US
utslib.citation.number	10	en_US
utslib.location	USA	en_US
utslib.citation.startpage	e76377	en_US
utslib.citation.endpage	e76377	en_US
utslib.identifier.org	SCI.Plant Functional Biology & Climate Change	en_US
utslib.for	060200	en_US
utslib.percentage	100	en_US
utslib.copyright.status	open_access

Abstract:

Understanding how multiple environmental stressors interact to affect seagrass health (measured as morphological and physiological responses) is important for responding to global declines in seagrass populations. We investigated the interactive effects of temperature stress (24, 27, 30 and 32?C) and shading stress (75, 50, 25 and 0% shade treatments) on the seagrass Zostera muelleri over a 3-month period in laboratory mesocosms. Z. muelleri is widely distributed throughout the temperate and tropical waters of south and east coasts of Australia, and is regarded as a regionally significant species. Optimal growth was observed at 27?C, whereas rapid loss of living shoots and leaf mass occurred at 32?C. We found no difference in the concentration of photosynthetic pigments among temperature treatments by the end of the experiment; however, up-regulation of photoprotective pigments was observed at 30?C. Greater levels of shade resulting in high photochemical efficiencies, while elevated irradiance suppressed effective quantum yield (?F/FM?). Chlorophyll fluorescence fast induction curves (FIC) revealed that the J step amplitude was significantly higher in the 0% shade treatment after 8 weeks, indicating a closure of PSII reaction centres, which likely contributed to the decline in ?F/FM? and photoinhibition under higher irradiance. Effective quantum yield of PSII (delta F/FM?) declined steadily in 32?C treatments, indicating thermal damage

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http://hdl.handle.net/10453/26508