In situ impact of petrochemicals on the photosynthesis of the seagrass Zostera capricorni

Macinnis-Ng, CMO; Ralph, PJ

In situ impact of petrochemicals on the photosynthesis of the seagrass Zostera capricorni

Macinnis-Ng, CMO

Ralph, PJ

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Publication Type:: Journal Article
Citation:: Marine Pollution Bulletin, 2003, 46 (11), pp. 1395 - 1407
Issue Date:: 2003-01-01

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Field	Value	Language
dc.contributor.author	Macinnis-Ng, CMO https://orcid.org/0000-0003-3935-9814	en_US
dc.contributor.author	Ralph, PJ https://orcid.org/0000-0002-3103-7346	en_US
dc.date.issued	2003-01-01	en_US
dc.identifier.citation	Marine Pollution Bulletin, 2003, 46 (11), pp. 1395 - 1407	en_US
dc.identifier.issn	0025-326X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/3585
dc.description.abstract	We used photosynthetic activity (measured as chlorophyll a fluorescence) and photosynthetic pigment concentrations to assess the effect of pulsed exposures of aged crude oil (Champion Crude), dispersant (VDC) and an oil+dispersant mixture on the seagrass Zostera capricorni Aschers in laboratory and field experiments, using custom-made chambers. Samples were exposed for 10 h to 0.25% and 0.1% concentrations of aged crude oil and dispersant as well as mixtures of 0.25% oil+0.05% dispersant and 0.1% oil+0.02% dispersant. During this time and for the subsequent four day recovery period, the maximum and effective quantum yields of photosystem II (Fv/Fm and ΔF/Fm ′ respectively) were measured. In the laboratory experiments, both values declined in response to oil exposure and remained low during the recovery period. Dispersant exposure caused a decline in both values during the recovery period, while the mixture of aged crude oil+dispersant had little impact on both quantum yields. In situ samples were less sensitive than laboratory samples, showing no photosynthetic impact due to dispersant and oil+dispersant mixture. Despite an initial decline in ΔF/Fm ′, in situ oil-exposed samples recovered by the end of the experiment. Chlorophyll pigment analysis showed only limited ongoing impact in both laboratory and field situations. This study suggests that laboratory experiments may overestimate the ongoing impact of petrochemicals on seagrass whilst the dispersant VDC can reduce the impact of oil on seagrass photosynthesis. © 2003 Elsevier Ltd. All rights reserved.	en_US
dc.relation.ispartof	Marine Pollution Bulletin	en_US
dc.relation.isbasedon	10.1016/S0025-326X(03)00290-X	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.subject.mesh	Zosteraceae	en_US
dc.subject.mesh	Chlorophyll	en_US
dc.subject.mesh	Surface-Active Agents	en_US
dc.subject.mesh	Spectrophotometry	en_US
dc.subject.mesh	Analysis of Variance	en_US
dc.subject.mesh	Petroleum	en_US
dc.subject.mesh	Environmental Exposure	en_US
dc.subject.mesh	Photosynthesis	en_US
dc.subject.mesh	Fluorescence	en_US
dc.subject.mesh	Australia	en_US
dc.subject.mesh	Chlorophyll A	en_US
dc.title	In situ impact of petrochemicals on the photosynthesis of the seagrass Zostera capricorni	en_US
dc.type	Journal Article
utslib.citation.volume	11	en_US
utslib.citation.volume	46	en_US
utslib.for	060203 Ecological Physiology	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/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	11	en_US
pubs.publication-status	Published	en_US
pubs.volume	46	en_US

Abstract:

We used photosynthetic activity (measured as chlorophyll a fluorescence) and photosynthetic pigment concentrations to assess the effect of pulsed exposures of aged crude oil (Champion Crude), dispersant (VDC) and an oil+dispersant mixture on the seagrass Zostera capricorni Aschers in laboratory and field experiments, using custom-made chambers. Samples were exposed for 10 h to 0.25% and 0.1% concentrations of aged crude oil and dispersant as well as mixtures of 0.25% oil+0.05% dispersant and 0.1% oil+0.02% dispersant. During this time and for the subsequent four day recovery period, the maximum and effective quantum yields of photosystem II (Fv/Fm and ΔF/Fm ′ respectively) were measured. In the laboratory experiments, both values declined in response to oil exposure and remained low during the recovery period. Dispersant exposure caused a decline in both values during the recovery period, while the mixture of aged crude oil+dispersant had little impact on both quantum yields. In situ samples were less sensitive than laboratory samples, showing no photosynthetic impact due to dispersant and oil+dispersant mixture. Despite an initial decline in ΔF/Fm ′, in situ oil-exposed samples recovered by the end of the experiment. Chlorophyll pigment analysis showed only limited ongoing impact in both laboratory and field situations. This study suggests that laboratory experiments may overestimate the ongoing impact of petrochemicals on seagrass whilst the dispersant VDC can reduce the impact of oil on seagrass photosynthesis. © 2003 Elsevier Ltd. All rights reserved.

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