Seasonal heterogeneity in the photophysiological response to air exposure in two tropical intertidal seagrass species

Petrou, K; Jimenez-Denness, I; Chartrand, K; McCormack, C; Rasheed, M; Ralph, PJ

Seasonal heterogeneity in the photophysiological response to air exposure in two tropical intertidal seagrass species

Petrou, K

Jimenez-Denness, I Chartrand, K

McCormack, C Rasheed, M

Ralph, PJ

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Publication Type:: Journal Article
Citation:: Marine Ecology Progress Series, 2013, 482 pp. 93 - 106
Issue Date:: 2013-05-22

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Field	Value	Language
dc.contributor.author	Petrou, K https://orcid.org/0000-0002-2703-0694	en_US
dc.contributor.author	Jimenez-Denness, I	en_US
dc.contributor.author	Chartrand, K https://orcid.org/0000-0002-0030-961X	en_US
dc.contributor.author	McCormack, C	en_US
dc.contributor.author	Rasheed, M https://orcid.org/0000-0002-8316-7644	en_US
dc.contributor.author	Ralph, PJ https://orcid.org/0000-0002-3103-7346	en_US
dc.date.issued	2013-05-22	en_US
dc.identifier.citation	Marine Ecology Progress Series, 2013, 482 pp. 93 - 106	en_US
dc.identifier.issn	0171-8630	en_US
dc.identifier.uri	http://hdl.handle.net/10453/23914
dc.description.abstract	Photosynthesis, chlorophyll a fluorescence, leaf bio-optical properties and pigments were measured in 2 tropical intertidal seagrass species, Zostera muelleri ssp. capricorni and Halophila ovalis before, during and after air-exposure over a tidal cycle. Data were collected across 4 seasons (October and January-growing seasons; May and July-senescent seasons) to determine seasonal dynamics in physiological responses to air exposure. Both species showed clear light-dependent responses with a decline in photosynthetic efficiency and increased photoprotection during periods of combined maximum daily irradiance and air exposure for all seasons. In Z. muelleri ssp. capricorni there was a negative correlation between air-exposed effective quan - tum yield and light intensity, suggesting exposure was driving this decline. Conversely, sensitivity (decline in effective quantum yield of photosystem II) to increased irradiance dominated the response in H. ovalis, with no change in the magnitude of this response between air-exposed and submerged blades. The response to air exposure observed in Z. muelleri ssp. capricorni showed seasonal variation, with a greater decline in photosynthesis during the spring (October). Tidal exposure did not provide intertidal seagrasses a 'window' of photosynthetic respite (increase in photosynthesis) from high natural or anthropogenic turbidity. However, the periods immediately prior to and after exposure were important for providing an optimum period for net photosynthetic gain. © Inter-Research 2013.	en_US
dc.relation.ispartof	Marine Ecology Progress Series	en_US
dc.relation.isbasedon	10.3354/meps10229	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Seasonal heterogeneity in the photophysiological response to air exposure in two tropical intertidal seagrass species	en_US
dc.type	Journal Article
utslib.citation.volume	482	en_US
utslib.for	0602 Ecology	en_US
utslib.for	0405 Oceanography	en_US
utslib.for	0608 Zoology	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
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	482	en_US

Abstract:

Photosynthesis, chlorophyll a fluorescence, leaf bio-optical properties and pigments were measured in 2 tropical intertidal seagrass species, Zostera muelleri ssp. capricorni and Halophila ovalis before, during and after air-exposure over a tidal cycle. Data were collected across 4 seasons (October and January-growing seasons; May and July-senescent seasons) to determine seasonal dynamics in physiological responses to air exposure. Both species showed clear light-dependent responses with a decline in photosynthetic efficiency and increased photoprotection during periods of combined maximum daily irradiance and air exposure for all seasons. In Z. muelleri ssp. capricorni there was a negative correlation between air-exposed effective quan - tum yield and light intensity, suggesting exposure was driving this decline. Conversely, sensitivity (decline in effective quantum yield of photosystem II) to increased irradiance dominated the response in H. ovalis, with no change in the magnitude of this response between air-exposed and submerged blades. The response to air exposure observed in Z. muelleri ssp. capricorni showed seasonal variation, with a greater decline in photosynthesis during the spring (October). Tidal exposure did not provide intertidal seagrasses a 'window' of photosynthetic respite (increase in photosynthesis) from high natural or anthropogenic turbidity. However, the periods immediately prior to and after exposure were important for providing an optimum period for net photosynthetic gain. © Inter-Research 2013.

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http://hdl.handle.net/10453/23914