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Ecophysiology of New Zealand Didymosphenia geminata nuisance diatom mats, compared to Tasmanian Gomphonema hydrofouling diatoms


Ravizza, M and Kuhajek, J and Martin, A and Wood, S and Hallegraeff, G, Ecophysiology of New Zealand Didymosphenia geminata nuisance diatom mats, compared to Tasmanian Gomphonema hydrofouling diatoms, Marine and Fresh-water Harmful Algae: Proceedings of the 16th International Conference on Harmful Algae, 27-31 October 2014, Wellington, New Zealand, pp. 114-117. ISBN 978-87-990827-5-9 (2015) [Refereed Conference Paper]

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The large stalk-forming diatom Didymosphenia geminata is responsible for nuisance blooms in New Zealand (NZ) streams and rivers, with negative impacts due to its massive production of persistent extracellular stalks. Because of these features the D. geminata problem has some similarities with the smaller stalkforming Gomphonema tarraleahae biofouling issues in Tasmanian hydrocanals. Comparative nutrient and light adaptation responses were characterized by in-situ Pulse Amplitude Modulated (PAM) fluorometry on Buller River (NZ) D. geminata, Lake Rotoiti (NZ) Gomphonema cf. manubrium and Tasmanian G. tarraleahae. Although these stalk-forming diatoms had different requirements in terms of light, flow rate and nutrients, all three species were inhibited by silica addition and D. geminata was stimulated by iron. Due to its broad environmental tolerance, D. geminata if introduced would be likely to establish in Tasmanian hydrocanals, where environmental conditions are similar to New Zealand water courses where D. geminata blooms.

Item Details

Item Type:Refereed Conference Paper
Keywords:diatom fouling, Didymospenia geminata, Gomphonema tarraleahae, nuiscance diatoms, New Zealand, Tasmania
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Fisheries - aquaculture not elsewhere classified
UTAS Author:Ravizza, M (Ms Matilde Ravizza)
UTAS Author:Hallegraeff, G (Professor Gustaaf Hallegraeff)
ID Code:103057
Year Published:2015
Funding Support:Australian Research Council (LP1010700)
Deposited By:IMAS Research and Education Centre
Deposited On:2015-09-17
Last Modified:2018-04-05
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