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Succession and physiological health of freshwater microalgal fouling in a Tasmanian hydropower canal

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Perkins, KJ and Andrewartha, JM and McMinn, A and Cook, SS and Hallegraeff, GM (2010) Succession and physiological health of freshwater microalgal fouling in a Tasmanian hydropower canal. Biofouling, 26 (6). pp. 637-644.

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Abstract

Freshwater microalgal biofouling in hydropower canals in Tarraleah, Tasmania, is dominated by a single diatom species, Gomphonema tarraleahae. The microfouling community is under investigation with the aim of reducing its impact on electricity generation. Species succession was investigated using removable glass slides. Fouled slides were examined microscopically and for chlorophyll a biomass. Chl a biomass increased steeply after 8 weeks (0.09– 0.87 mg m72), but increased much earlier on slides surrounded by a biofouled inoculum. Succession began with low profile diatoms such as Tabellaria flocculosa, progressing to stalked diatoms such as Gomphonema spp. and Cymbella aspera. Few chlorophytes and no filamentous algae were present. Pulse amplitude modulated fluorometry was used to measure the physiological health of fouling on the canal wall. Maximum quantum yield (Fv/Fm) measurements were consistently 50.18, indicating that the fouling mat consisted of dead or dying algae. The succession and physiological health of cells in the fouling community has broad implications for mitigation techniques used.

Item Type: Article
Keywords: biofouling; succession; microalgae; Gomphonema; hydropower; pulse amplitude modulated fluorometry
Journal or Publication Title: Biofouling
Page Range: pp. 637-644
Identification Number - DOI: 10.1080/08927014.2010.506610
Additional Information: The definitive published version is available online at: http://www.tandf.co.uk/journals
Date Deposited: 21 Nov 2011 02:56
Last Modified: 21 Nov 2011 02:56
URI: http://eprints.utas.edu.au/id/eprint/12236
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