DIATOM FOULING PROBLEMS IN A TASMANIAN HYDRO CANAL, INCLUDING THE DESCRIPTION OF<i>GOMPHONEMA TARRALEAHAE</i>SP. NOV.

Perkins, KJ; Sargison, JE; Hallegraeff, GM

doi:10.1080/0269249x.2009.9705808

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…Chl a biomass levels in the fouling on the slides were similar to levels previously found in fouling grown on the canal wall (51500 mg m 72 slides, 1000-5000 mg m 72 natural [Perkins et al 2009]) when approximately 6-8 months old and from the same area as the succession trials, even though a much greater volume of fouling material was present on the canal wall (wet weight of 290 g m 72 ). The slides used in the succession trial were never heavily fouled.…”

Section: Discussionsupporting

confidence: 59%

“…Fouling of all species was heavier at the edges of the slides, with G. tarraleahae especially establishing at the edge first then extending in to the centre of the slide. Despite this, species composition on the entire slide was not significantly different to that found on the canal wall during irregular sampling over the study period and the year preceding the study (Perkins et al 2009). Figure 4 summarises species presence on slides on a relative abundance scale of 0 to 3.…”

Section: Fouling Species Compositionmentioning

confidence: 54%

“…The slides used in the succession trial were never heavily fouled. The chl a levels found for the natural Tarraleah wall fouling were very low compared to the literature data for biofouling, with most values in excess of 1000 times higher than those at Tarraleah (Moss 1968;Perkins et al 2009). Microscopic inspection of this natural fouling material has shown that a large proportion consisted of stalks with no cells attached, trapped detritus and gravel, which was consistently the case for fouling that has been on the canal wall for a number of months.…”

Section: Discussionmentioning

confidence: 72%

“…Water velocity is higher (1.8-2 m s 71 ) than would be found in a natural stream or river. Available nutrients are low, with a N:P ratio of 20:1 (Perkins et al 2009), but constantly replaced due to the high flow velocity. The dominance of a single Gomphonema species can be attributed to that species having the specific adaptations necessary to survive and out-compete others in the unique Tarraleah conditions.…”

Section: Discussionmentioning

confidence: 99%

“…1 Canal, diatom fouling is a major management issue. Fouling consists mainly of Gomphonema tarraleahae Perkins and Hallegraeff and reaches a thickness of 5-10 mm within a 6-month period (Perkins et al 2009). This fouling reduces the efficiency of water movement through the canal, having a significant impact on drag coefficient, with increases of up to 99% measured over clean surface values.…”

Section: Introductionmentioning

confidence: 98%

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

et al. 2010

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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 m(-2)), 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 (F(v)/F(m)) measurements were consistently <0.18, 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.

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Section: Discussionsupporting

confidence: 59%

Section: Fouling Species Compositionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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

et al. 2010

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Development and experimental validation of an overlay mortar with biocide activity

Vaquero¹,

Cugat

Segura

et al. 2016

Cement and Concrete Composites

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Biodeterioration of concrete by microorganism colonisation may be a problem in several structures, especially in irrigation and hydroelectric canals. The main problem in such structures is the proliferation of algae and cyanobacteria that affect the performance of the structure, increase the maintenance costs and affects its durability. A research was conducted to develop a novel cement-based material with biocide activity that can be used as an overlay mortar in existing structures, such as canals and pipes. With this aim, ten commercial biocides were evaluated in a laboratory campaign to assess the effectiveness of the compounds against the microbial colonisation of concrete. Both mono- and multicomponent formulations were designed from the commercial products, to increase their antimicrobial effect obtaining a set of biocide formulations. The formulations were submitted to a flowchart process to determine their influence on the physical properties of the concrete, evaluate the release of the actives, and their antimicrobial efficiency both before and after accelerated aging processes. During the campaign, some formulations were observed to diminish the strength of the concrete. Such behaviour was normally due to the interaction of the active with the cement hydration process. Other formulations showed a high release of active from the concrete in water, compromising the durability of the treatment. In general, monocomponent formulations did not succeed to fulfill all the requirements, thus multicomponent formulations were analysed. One studied multicomponent formulation presented particularly good results in all properties analysed. This product did not significantly change the properties of concrete and the release of active in water from the concrete was low, while the antimicrobial effects were long lasting.Peer ReviewedPostprint (author's final draft

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Environmental conditions influencing growth rate and stalk formation in the estuarine diatomLicmophora flabellata(Carmichael ex Greville) C.Agardh

Ravizza

Hallegraeff

2015

Diatom Research

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DIATOM FOULING PROBLEMS IN A TASMANIAN HYDRO CANAL, INCLUDING THE DESCRIPTION OFGOMPHONEMA TARRALEAHAESP. NOV.

Cited by 6 publications

References 6 publications

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

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

Development and experimental validation of an overlay mortar with biocide activity

Environmental conditions influencing growth rate and stalk formation in the estuarine diatomLicmophora flabellata(Carmichael ex Greville) C.Agardh

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