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Diatom fouling problems in a Tasmanian Hydro Canal, including the description of Gomphonema tarraleahae sp. nov


Perkins, KJ and Sargison, JE and Hallegraeff, GM, Diatom fouling problems in a Tasmanian Hydro Canal, including the description of Gomphonema tarraleahae sp. nov, Diatom Research, 24, (2) pp. 377-391. ISSN 0269-249X (2009) [Refereed Article]

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Copyright 2009 International Society for Diatom Research

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DOI: doi:10.1080/0269249X.2009.9705808


Open air freshwater hydrocanals in Tarraleah, Tasmania, Australia, exhibit significant diatom biofouling which leads to economic losses in hydroelectricity generation. These fast-flowing (flow velocity 2 m s-1) canals produce between 2 and 18 tonnes dry weight of fouling and 1-5 mg chlorophyll a/m2 over a 20 km long course, with the canal surface area being 192,000 m2. Mostly monospecific diatom communities of Tabellaria flocculosa occur in canal sections with reduced flow, whereas a stalk-forming (up to 200 μm long) Gomphonema species dominates the majority of canal fouling in fast flowing areas. Gomphonema tarraleahae Perkins et Hallegraeff is newly described, the species differing from its close relative, G. angustatum (Kützing) Rabenhorst in its extreme stalking habit and distinctive head and footpoles. Low numbers of G. subclavatum (Grunow) Grunow and two other undescribed Gomphonema species were also present in fouling. Seasonal changes in biofouling are most likely related to temperature (5-15°C annually) and light intensity variation, with shaded, south-facing walls exhibiting higher fouling densities. Implications for fouling mitigation strategies are discussed.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial systems and management not elsewhere classified
UTAS Author:Perkins, KJ (Miss Kate Perkins)
UTAS Author:Sargison, JE (Dr Jane Sargison)
UTAS Author:Hallegraeff, GM (Professor Gustaaf Hallegraeff)
ID Code:59945
Year Published:2009
Web of Science® Times Cited:7
Deposited By:Plant Science
Deposited On:2009-12-23
Last Modified:2010-05-11
Downloads:6 View Download Statistics

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