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

Citation

Ravizza, M and Hallegraeff, G, Environmental conditions influencing growth rate and stalk formation in the estuarine diatom Licmophora flabellata (Carmichael ex Greville) C. Agardh, Diatom Research, 30, (2) pp. 197-208. ISSN 0269-249X (2015) [Refereed Article]

Copyright Statement

© 2015 The International Society for Diatom Research

DOI: doi:10.1080/0269249X.2015.1020071

Abstract

Submerged natural and artificial marine substrata can rapidly become covered by biofouling organisms, of which diatoms are the early algal colonisers. Licmophora flabellata is an estuarine stalk-forming diatom that strongly adheres to substrata via a compound-branching polysaccharide stalk. In the present study, the effects of light, nutrients, temperature and turbulence were examined in laboratory cultures to determine how they affected stalk formation and growth rates. Growth rates in multiwell plates were estimated using in vivo fluorescence in a plate reader. Low light intensities (50, 100 and 150 µmol photons m−2 s−1) produced no or poor growth, whereas growth rates of 0.24–0.42 divisions per day were achieved at 233 µmol photons m−2 s−1. High growth rates coincided with long stationary growth periods (21–36 days) and long branching stalks (800–3500 µm). N, P and Si nutrients had no effect on growth or stalks, whereas high turbulence (from an orbital shaker) reduced stalk length but not growth. The results call for species-specific approaches towards mitigating the impact of fouling diatoms.

Item Details

Item Type:Refereed Article
Keywords:diatom hydrofouling, growth rate, Licmophora flabellata, stalk formation
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Phycology (incl. Marine Grasses)
Objective Division:Energy
Objective Group:Renewable Energy
Objective Field:Hydro-Electric Energy
Author:Ravizza, M (Ms Matilde Ravizza)
Author:Hallegraeff, G (Professor Gustaaf Hallegraeff)
ID Code:101059
Year Published:2015
Funding Support:Australian Research Council (LP1010700)
Deposited By:IMAS Research and Education Centre
Deposited On:2015-06-09
Last Modified:2016-04-18
Downloads:0

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