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Effects of desalination brine and seawater with the same elevated salinity on growth, physiology and seedling development of the seagrass Posidonia australis
journal contribution
posted on 2019-03-01, 00:00 authored by Marion L Cambridge, Andrea Zavala-Perez, Greg R Cawthray, John Statton, Julie MondonJulie Mondon, Gary A KendrickDesalination has the potential to provide an important source of potable water to growing coastal populations but it also produces highly saline brines with chemical additives, posing a possible threat to benthic marine communities. The effects of brine (0%, 50%, 100%) were compared to seawater treatments with the same salinity (37, 46, 54 psu) for seagrass (Posidonia australis) in mesocosms over 2 weeks. There were significant differences between brine and salinity treatments for photosynthesis, water relations and growth. Germinating seedlings of P. australis were also tested in brine treatments (0%, 25%, 50%, 100%) over 7 weeks followed by 2.5 weeks recovery in seawater. Growth was severely inhibited only in 100% brine. These experiments demonstrated that brine increased the speed and symptoms of stress in adult plants compared to treatments with the same salinity, whereas seedlings tolerated far longer brine exposure, and so could potentially contribute to seagrass recovery through recruitment.
History
Journal
Marine Pollution BulletinVolume
140Pagination
462 - 471Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
eISSN
1879-3363Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2019, ElsevierUsage metrics
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Amino acidsBrine additivesChlorophyll ‘a’ fluorescenceOsmolytes, water and osmotic potentialRaised salinityWater relationsScience & TechnologyLife Sciences & BiomedicineEnvironmental SciencesMarine & Freshwater BiologyEnvironmental Sciences & EcologyChlorophyll 'a' fluorescenceANTARCTICA LABILL SONDERCYMODOCEA-NODOSAAMPHIBOLIS-ANTARCTICAWESTERN-AUSTRALIASHARK-BAYMICROBIAL COMMUNITIESOCEANICAPLANTRESPONSES
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