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RESEARCH ARTICLE
Contents Vol 60(10)

Short-lived dissolved nitrate pulses in a shallow Western Australian coastal lagoon

M. J. Lourey A C and H. Kirkman B
+ Author Affiliations
- Author Affiliations

A CSIRO Marine and Atmospheric Research, Private Bag No 5, Wembley, WA 6913, Australia.

B 5A Garden Grove, Seaholme, Vic. 3018, Australia.

C Corresponding author. Email: martin.lourey@csiro.au

Marine and Freshwater Research 60(10) 1068-1080 https://doi.org/10.1071/MF08298
Submitted: 24 October 2008  Accepted: 1 April 2009   Published: 20 October 2009

Abstract

The source of nutrients that sustains abundant benthic primary productivity on Western Australian coastal reef systems is unknown, but it is possible that cycling between organic matter production and remineralisation contributes and may be enhanced by variations in the magnitude of physical forcing. We have used a 5-year nitrate dataset collected at weekly, daily and hourly temporal scales to investigate dynamics and supply mechanisms in Marmion Lagoon, Perth, Western Australia. Nitrate concentrations were variable over short time scales (hours) and formed pulses of elevated nutrient concentrations. On average, nitrate concentrations were highest during the high energy winter period (June to August) and scant wave data (June to August 1984) suggest a general correlation between wave activity and nitrate concentration. While it was not possible to definitively link variations in nitrate to wave forcing, increased energy may have promoted carbon recycling and nitrate release (possibly through abrasion of macroalgae, resuspension of detrital material or enhanced pore water exchange). Rapid uptake suggests that the nitrate pulses observed here may help sustain primary productivity in this shallow high energy environment. High temporal (hourly) variability suggests future surveys must sample at a frequency adequate to isolate long-term temporal trends from short-term background variations.

Additional keywords: macroalgae, nitrogen, reef, seasonal, storms, waves.


Acknowledgements

We thank the Western Australian Marine Science Institution and CSIRO Marine and Atmospheric Research for supporting this project. Thanks are due to the technicians who braved storms of winds to 107 km h–1 and rough weather to obtain the water samples, particularly Ian Cook who also made sure our boat was in good order. Bob Griffiths spent many hours carefully analysing water samples and keeping up quality control, many thanks. Thanks to Jim Greenwood, Graham Symonds and the anonymous reviewers for comments on earlier drafts of this manuscript.


References

Brearley A. (2005). The Swan-Canning estuary. In ‘Ernest Hodgkin’s Swanland: The Estuaries and Coastal Lagoons of South-Western Australia’. pp. 91–104. (University of Western Australia Press: Perth.)

Buggeln, R. G. (1974). Physiological investigations on Alaria esculenta (L.) Grev. (Laminariales). 1. Elongation of the blade. Journal of Phycology 10, 283–288.
|  CAS | Feng M., and Wild-Allen K. (in press). Productivity and nitrogen fluxes along the downwelling coast off Western Australia. In ‘Carbon and Nutrient Fluxes in Continental Margins: A Global Synthesis’. (Eds K.-K. Liu, L. Atkinson, R. Quinones and L. Talaue-McManus.) (Springer: New York.)

Gagne, J. A. , Mann, K. H. , and Chapman, A. R. O. (1982). Seasonal patterns of growth and storage in Laminaria longicruris in relation to differing patterns of availability of nitrogen in the water. Marine Biology 69, 91–101.
| Crossref | GoogleScholarGoogle Scholar | Nixon S. W. (1981). Remineralization and nutrient cycling in coastal marine ecosystems. In ‘Estuaries and Nutrients’. (Eds B. J. Neilson and L. E. Cronin.) pp. 111–138. (The Humana Press: Clifton, NJ.)

Pearce A. F., Johannes R. E., Manning C. R., Rimmer D. W., and Smith D. F. (1985). Hydrology and nutrient data off Marmion, Perth, 1979–1982. CSIRO Marine Laboratories Report 167.

Pearce, A. F. , Lynch, M. J. , and Hanson, C. E. (2006). The Hillarys transect (1): Seasonal and cross shelf variability of physical and chemical water properties off Perth, Western Australia, 1996–1998. Continental Shelf Research 26, 1689–1729.
| Crossref | GoogleScholarGoogle Scholar | Robertson A. I., and Hansen J. A. (1982). Decomposing seaweed: a nuisance or a vital link in coastal food chains? CSIRO Marine Laboratories Research Report 1979–1981. Reprint No. 1362, 75–84.

Shum, K. T. , and Sundby, B. (1996). Organic matter processing in continental shelf sediments – the subtidal pump revisited. Marine Chemistry 53, 81–87.
| Crossref | GoogleScholarGoogle Scholar | CAS | Strickland J. D. H., and Parsons T. R. (1972). ‘A Practical Manual of Sea-water Analysis.’ 2nd Edn. Technical Bulletin 167. (Fisheries Research Board of Canada: Ottawa, Canada.)

Thompson, P. , and Waite, A. (2003). Phytoplankton responses to wastewater discharges at two sites in Western Australia. Marine and Freshwater Research 54, 721–735.
| Crossref | GoogleScholarGoogle Scholar | CAS | Trefry M. G., Davis G. B., Johnston C. D., Gardiner A. G., Pollock D. W., and Smith A. J. (2006). Status of groundwater quality in the Cockburn Sound catchment. Final Report to Cockburn Sound Management Council. CSIRO Land and Water, Perth, WA.

Wainright, S. C. , and Hopkinson, C. S. (1997). Effects of sediment resuspension on organic matter processing in coastal environments: a simulation model. Journal of Marine Systems 11, 353–368.
| Crossref | GoogleScholarGoogle Scholar |

Wheeler, P. A. , and North, J. W. (1981). Nitrogen supply, tissue composition and frond growth rates for Macrocystis pyrifera off the coast of Southern California. Marine Biology 64, 59–69.
| Crossref | GoogleScholarGoogle Scholar | CAS |

Zimmerman, R. C. , and Kremer, J. N. (1984). Episodic nutrient supply to a kelp forest ecosystem in Southern California. Journal of Marine Research 42, 591–604.
| Crossref | GoogleScholarGoogle Scholar |