| Autor: |
Bowling LC; DPI Water, NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Private Bag 4008, Narellan, NSW, 2567, Australia. bowlinglimnology@gmail.com.; Centre for Ecosystem Science, University of New South Wales, Sydney, NSW, 2052, Australia. bowlinglimnology@gmail.com.; 3 Shrike Place, Ingleburn, NSW, 2565, Australia. bowlinglimnology@gmail.com., Shaikh M; DPI Water, NSW Department of Primary Industries, Locked Bag 5123, Parramatta, NSW, 2124, Australia., Brayan J; DPI Water, NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Private Bag 4008, Narellan, NSW, 2567, Australia., Malthus T; CSIRO Oceans and Atmosphere Flagship, Ecosciences Precinct, 41 Boggo Road, Dutton Park, QLD, 4102, Australia. |
| Abstrakt: |
A commercially available handheld spectroradiometer, the WISP-3, was assessed as a tool for monitoring freshwater cyanobacterial blooms for management purposes. Three small eutrophic urban ponds which displayed considerable within-pond and between-pond variability in water quality and cyanobacterial community composition were used as trial sites. On-board algorithms provide field measurements of phycocyanin (CPC) and chlorophyll-a (Chl-a) from surface reflectance spectra measured by the instrument. These were compared with laboratory measurements. Although significant but weak relationships were found between WISP-3 measured CPC and cyanobacterial biovolume measurements and WISP-3 and laboratory Chl-a measurements, there was considerable scatter in the data due likely to error in both WISP-3 and laboratory measurements. The relationships generally differed only slightly between ponds, indicating that different cyanobacterial communities had little effect on the pigment retrievals of the WISP-3. The on-board algorithms need appropriate modification for local conditions, posing a problem if it is to be used extensively across water bodies with differing optical properties. Although suffering a range of other limitations, the WISP-3 has a potential as a rapid screening tool for preliminary risk assessment of cyanobacterial blooms. However, such field assessment would still require adequate support by sampling and laboratory-based analysis. |
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