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Nutrient and gilvin levels in waters of coastal-plain wetlands in an agricultural area of Western Australia

Wrigley, T.J., Chambers, J.M. and McComb, A.J. (1988) Nutrient and gilvin levels in waters of coastal-plain wetlands in an agricultural area of Western Australia. Marine and Freshwater Research, 39 (5). pp. 685-694.

Link to Published Version: http://dx.doi.org/10.1071/MF9880685
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Abstract

The Peel-Harvey catchment lies on a sandy coastal plain, largely cleared for agriculture, and drains into a eutrophic estuarine system. Sixty-eight wetlands in the catchment had total phosphorus concentrations of 0.4-7.8 mg I-1, the high values being atrributed to agricultural activity. Conductivity was 150-8770 µS cm-1, pH 4.1-9.3. Waters contained high concentrations of gilvin, up to 262 g440 m-1 with a mean ratio of 6.2. Particulate material contributed little to light absorption at lower wavelengths (400-450 nm) but governed absorbance at 600-700 nm. Wetlands with the largest concen- trations of gilvin were located in the grey Bassendean sands, leachates from which had gilvin levels up to 748 g440 m-1. NO phytoplankton blooms were observed, and it is suggested that high gilvin levels and the consequent reduction in light penetration are important in maintaining low phytoplankton biomass in these lakes.

Publication Type: Journal Article
Murdoch Affiliation: School of Environmental and Life Sciences
Publisher: CSIRO Publishing
Copyright: © CSIRO 1988
URI: http://researchrepository.murdoch.edu.au/id/eprint/17381
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