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RESEARCH ARTICLE
Contents Vol 60(3)

Impact of secondary salinisation on freshwater ecosystems: effect of experimentally increased salinity on an intermittent floodplain wetland

Kimberley R. James A E , Barry T. Hart B , Paul C. E. Bailey C and Dean W. Blinn D
+ Author Affiliations
- Author Affiliations

A School of Life and Environmental Sciences, Deakin University, Burwood, Vic. 3125, Australia.

B Water Studies Centre, Monash University, Clayton, Vic. 3800, Australia.

C School of Biological Sciences, Monash University, Clayton, Vic. 3800, Australia.

D Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011, USA.

E Corresponding author. Email: kimjames@deakin.edu.au

Marine and Freshwater Research 60(3) 246-258 https://doi.org/10.1071/MF08099
Submitted: 27 March 2008  Accepted: 25 October 2008   Published: 27 March 2009

Abstract

Intermittent wetlands are particularly at risk from secondary salinisation because salts are concentrated during drawdown. We conducted a field experiment to examine the effect of adding salt at two different concentrations (to achieve nominal conductivities of 1000 μS cm–1 (low salt) and 3000 μS cm–1 (high salt)) on water quality, freshwater plants and epiphytic diatoms in an intermittent wetland during a 3.3-month drawdown. Conductivity increased to 3000 and 8500 μS cm–1 in low-salt and high-salt treatments respectively. Salt was apparently lost to the sediments, causing protons to be released from the sediments and reducing water column pH from 6.9 to 5.5 in the low-salt treatment and to 4.0 in the high-salt treatments. Forty days after adding the salt, biomass, %cover and flower production in Potamogeton cheesmanii were significantly reduced, whereas Amphibromus fluitans was not significantly affected. The salt effect on Triglochin procera was intermediate between the other two macrophytes. Significant reductions in the density, species richness and diversity of epiphytic diatoms occurred in the high-salt, but not in the low-salt, treatments. Our work shows that increases in salinity, and thus conductivity (up to 8500 μS cm–1), in low-alkalinity intermittent wetlands can change water quality, with significant adverse effects on some macrophyte and diatom communities.

Additional keywords: diatoms, macrophytes, mesocosms, salinity, water quality.


Acknowledgements

The present study was funded by the Victorian Salinity Bureau (Project No. C221), the Water Studies Centre at Monash University and by Land & Water Australia (Project UMO18). We thank Caroline Douglas of the Wetlands Unit, Department of Conservation and Natural Resources for her advice on suitable site selection, and Annaliese Sampey, Nadine Marshall and Jim Radford for their assistance with field work and laboratory analyses. Professor Gerry Quinn kindly provided advice on statistical analyses. We are also grateful to the two referees and the editor for their comments that considerably improved this paper.


References

APHA (2007). ‘Standard Method for Analysis of Waters and Wastewaters.’ 21st edn. (American Public Health Association: Washington, D.C.)

Bailey P. C. E., Boon P. I., Blinn D. W., and Williams W. D. (2006). Salinisation as an ecological perturbation to rivers, streams and wetlands of arid and semi-arid zones. In ‘Changeable, Changed, Changing: The Ecology of Rivers from the World’s Dry Regions’. (Ed. R. Kingsford.) pp. 280–314. (Cambridge University Press: Cambridge, UK.)

Blinn, D. W. , and Bailey, P. C. E. (2001). Land-use influence on stream water quality and diatom communities in Victoria, Australia: a response to secondary salinization. Hydrobiologia 466, 231–244.
| Crossref | GoogleScholarGoogle Scholar | CAS | Brock M. (1991). Mechanisms for maintaining persistent populations of Myriophyllum variifolium J. Hooker in a fluctuating shallow Australian lake. Aquatic Botany 39, 211–219.

Brock M. A. (1998). Are temporary wetlands resilient? Evidence from seed banks of Australian and South African wetlands. In ‘Wetlands for the Future’. (Eds A. J. McComb and J. A. Davis.) pp. 193–206. (Gleneagles Publishing: Adelaide.)

Davis, J. A. , McGuire, M. , Halse, S. A. , Hamilton, D. , Horwitz, P. , McComb, A. J. , Froend, R. H. , Lyons, M. , and Sim, L. (2003). What happens when you add salt: predicting impacts of secondary salinisation on shallow aquatic ecosystems by using an alternative-states model. Australian Journal of Botany 51, 715–724.
| Crossref | GoogleScholarGoogle Scholar | Department of Conservation and Environment (1992). An assessment of Victoria’s Wetlands. (Department of Conservation and Environment and The Office of the Environment: Melbourne.)

Figuerola, J. , and Green, A. J. (2002). Dispersal of aquatic organisms by waterbirds: a review of past research and priorities for future studies. Freshwater Biology 47, 483–494.
| Crossref | GoogleScholarGoogle Scholar | Herbst D. B., and Blinn D. W. (1998). Experimental mesocosm studies of salinity effects on the benthic algal community of a saline lake. Journal of Phycology 34, 772–778.

Horrigan, N. , Dunlop, J. E. , Kefford, B. J. , and Zavahir, F. (2007). Acute toxicity largely reflects the salinity sensitivity of stream macroinvertebrates derived using field distributions. Marine and Freshwater Research 58, 178–186.
| Crossref | GoogleScholarGoogle Scholar | CAS | James K., Cant B., and Ryan T. (2003). Response of freshwater biota to rising salinity levels and implications for saline water management: a review. Australian Journal of Botany 51, 703–713.

Jordan, T. E. , Cornwell, J. C. , Boynton, W. R. , and Anderson, J. T. (2008). Changes in phosphorus biogeochemistry along an estuarine salinity gradient: the iron conveyer belt. Limnology and Oceanography 53, 172–184.
|  CAS | NLWA (2001). ‘Australian Dryland Salinity Assessment 2000: Extent, Impacts, Processes, Monitoring and Management Options.’ (National Land & Water Audit, Land & Water Australia: Canberra.)

Qiu, S. , and McComb, A. J. (1994). Effects of oxygen concentration on phosphorus release from reflooded air-dried wetland sediments. Australian Journal of Marine and Freshwater Research 45, 1319–1328.
| Crossref | GoogleScholarGoogle Scholar | CAS | Quinn G. P., and Keough M. J. (2002). ‘Experimental Design and Data Analysis for Biologists.’ (Cambridge University Press: Cambridge, UK.)

Robertson, H. A. , and James, K. (2007). Plant establishment from the seedbank of a degraded floodplain wetland: a comparison of two alternative management scenarios. Plant Ecology 188, 145–164.
| Crossref | GoogleScholarGoogle Scholar | Sainty G. R., and Jacobs S. W. L. (2003). ‘Waterplants in Australia.’ (Sainty and Associates Pty Ltd: Sydney.)

Salt Force (1989). ‘Salinity. The underground flood – Goulburn/Broken Salinity Pilot Program.’ (Government of Victoria: Melbourne.)

Salter, J. , Morris, K. , and Boon, P. I. (2008). Does salinity reduce the tolerance of two contrasting wetland plants, the submerged monocot Vallisneria australis and the woody shrub Melaleuca ericifolia, to wetting and drying? Marine and Freshwater Research 59, 291–303.
| Crossref | GoogleScholarGoogle Scholar | Sonneman J. A., Sincock A., Fluin J., Reid M., Newal P., Tibby J., and Gell P. (1999). ‘Illustrated Guide to Common Stream Diatom Species from Temperate Australia.’ Identification Guide No. 33. (Cooperative Research Centre for Freshwater Ecology: Albury, NSW.)

Strehlow, K. , Davis, J. A. , Sim, L. , Chambers, J. , Halse, S. A. , Hamilton, D. , Horwitz, P. , McComb, A. J. , and Froend, R. H. (2005). Temporal changes between ecological regimes in a range of primary and secondary salinised wetlands. Hydrobiologia 552, 17–31.
| Crossref | GoogleScholarGoogle Scholar |

Titus, J. E. , and Hoover, D. T. (1991). Towards predicting reproductive success in submersed freshwater angiosperms. Aquatic Botany 41, 111–136.
| Crossref | GoogleScholarGoogle Scholar |

Warwick, N. W. M. , and Bailey, P. C. E. (1997). The effect of increasing salinity on the growth and ion content of three non-halophytic wetland macrophytes. Aquatic Botany 58, 73–88.
| Crossref | GoogleScholarGoogle Scholar | CAS |

Warwick, N. W. M. , and Bailey, P. C. E. (1998). The effect of time of exposure to NaCl on leaf demography and growth for two non-halophytic wetland macrophytes, Potamogeton tricarinatus F.Muell. and A. Benn. Ex A. Benn. and Triglochin procera R.Br. Aquatic Botany 62, 19–31.
| Crossref | GoogleScholarGoogle Scholar | CAS |

Wedderburn, S. D. , Walker, K. F. , and Zampatti, B. P. (2008). Salinity may cause fragmentation of hardyhead (Teleostei : Atherinidea) polulations in the River Murray, Australia. Marine and Freshwater Research 59, 254–258.
| Crossref | GoogleScholarGoogle Scholar | CAS |

Williams, W. D. (1987). Salinization of rivers and streams: an important environmental hazard. Ambio 16, 180–185.


Williams, W. D. (1999). Salinisation: a major threat to water resources in the arid and semi-arid regions of the world. Lakes and Reservoirs: Research and Management 4, 85–91.
| Crossref | GoogleScholarGoogle Scholar |

Zalizniak, L. , Kefford, B. J. , and Nugegoda, D. (2006). Is all salinity the same? I. The effect of ionic composition on the salinity tolerance of five species of freshwater invertebrates. Marine and Freshwater Research 57, 75–82.
| Crossref | GoogleScholarGoogle Scholar | CAS |