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Effects of high salinity from desalination brine on growth, photosynthesis, water relations and osmolyte concentrations of seagrass Posidonia australis

Cambridge, M.L., Zavala-Perez, A., Cawthray, G. R., Mondon, J. and Kendrick, G. A. 2016, Effects of high salinity from desalination brine on growth, photosynthesis, water relations and osmolyte concentrations of seagrass Posidonia australis, Marine pollution bulletin, In Press, pp. 1-9, doi: 10.1016/j.marpolbul.2016.11.066.

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Title Effects of high salinity from desalination brine on growth, photosynthesis, water relations and osmolyte concentrations of seagrass Posidonia australis
Author(s) Cambridge, M.L.
Zavala-Perez, A.
Cawthray, G. R.
Mondon, J.
Kendrick, G. A.
Journal name Marine pollution bulletin
Season In Press
Start page 1
End page 9
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016
ISSN 0025-326X
1879-3363
Keyword(s) Amino acids
Bioindicators
Brine
Ions
Sugars
Summary Highly saline brines from desalination plants expose seagrass communities to salt stress. We examined effects of raised salinity (46 and 54psu) compared with seawater controls (37psu) over 6weeks on the seagrass, Posidonia australis, growing in tanks with the aim of separating effects of salinity from other potentially deleterious components of brine and determining appropriate bioindicators. Plants survived exposures of 2-4weeks at 54psu, the maximum salinity of brine released from a nearby desalination plant. Salinity significantly reduced maximum quantum yield of PSII (chlorophyll a fluorescence emissions). Leaf water potential (Ψw) and osmotic potential (Ψπ) were more negative at increased salinity, while turgor pressure (Ψp) was unaffected. Leaf concentrations of K(+) and Ca(2+) decreased, whereas concentrations of sugars (mainly sucrose) and amino acids increased. We recommend leaf osmolarity, ion, sugar and amino acid concentrations as bioindicators for salinity effects, associated with brine released in desalination plant outfalls.
Language eng
DOI 10.1016/j.marpolbul.2016.11.066
Field of Research 050204 Environmental Impact Assessment
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
060701 Phycology (incl Marine Grasses)
MD Multidisciplinary
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30090589

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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