Effects of desalination brine and seawater with the same elevated salinity on growth, physiology and seedling development of the seagrass Posidonia australis

Research output: Contribution to journalArticle

Abstract

Desalination 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.

Original languageEnglish
Pages (from-to)462-471
Number of pages10
JournalMarine Pollution Bulletin
Volume140
DOIs
Publication statusPublished - Mar 2019

Cite this

@article{a554fabc5c7540d38bd6eb5ec5313e99,
title = "Effects of desalination brine and seawater with the same elevated salinity on growth, physiology and seedling development of the seagrass Posidonia australis",
abstract = "Desalination 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.",
keywords = "Raised salinity, Brine additives, Chlorophyll 'a' fluorescence, Water relations, Osmolytes, water and osmotic potential, Amino acids, ANTARCTICA LABILL SONDER, CYMODOCEA-NODOSA, WATER RELATIONS, AMPHIBOLIS-ANTARCTICA, WESTERN-AUSTRALIA, SHARK-BAY, MICROBIAL COMMUNITIES, OCEANICA, PLANT, RESPONSES",
author = "Cambridge, {Marion L.} and Andrea Zavala-Perez and Cawthray, {Greg R.} and John Statton and Julie Mondon and Kendrick, {Gary A.}",
year = "2019",
month = "3",
doi = "10.1016/j.marpolbul.2019.02.001",
language = "English",
volume = "140",
pages = "462--471",
journal = "Marine Pollution Bulletin",
issn = "0025-326X",
publisher = "Pergamon",

}

TY - JOUR

T1 - Effects of desalination brine and seawater with the same elevated salinity on growth, physiology and seedling development of the seagrass Posidonia australis

AU - Cambridge, Marion L.

AU - Zavala-Perez, Andrea

AU - Cawthray, Greg R.

AU - Statton, John

AU - Mondon, Julie

AU - Kendrick, Gary A.

PY - 2019/3

Y1 - 2019/3

N2 - Desalination 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.

AB - Desalination 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.

KW - Raised salinity

KW - Brine additives

KW - Chlorophyll 'a' fluorescence

KW - Water relations

KW - Osmolytes, water and osmotic potential

KW - Amino acids

KW - ANTARCTICA LABILL SONDER

KW - CYMODOCEA-NODOSA

KW - WATER RELATIONS

KW - AMPHIBOLIS-ANTARCTICA

KW - WESTERN-AUSTRALIA

KW - SHARK-BAY

KW - MICROBIAL COMMUNITIES

KW - OCEANICA

KW - PLANT

KW - RESPONSES

U2 - 10.1016/j.marpolbul.2019.02.001

DO - 10.1016/j.marpolbul.2019.02.001

M3 - Article

VL - 140

SP - 462

EP - 471

JO - Marine Pollution Bulletin

JF - Marine Pollution Bulletin

SN - 0025-326X

ER -