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Diurnal changes of photoadaptive pigments in microphytobenthos


Jordan, L and McMinn, A and Thompson, P, Diurnal changes of photoadaptive pigments in microphytobenthos, Marine Biological Association of The United Kingdom. Journal, 90, (5) pp. 1025-1032. ISSN 0025-3154 (2010) [Refereed Article]

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Copyright Statement

Copyright © Marine Biological Association of the United Kingdom 2009

DOI: doi:10.1017/S0025315409990816


Microphytobenthos need photoadaptive strategies to survive the highly dynamic light environment in which they reside. Xanthophyll pigments can provide photoprotection by cycling electrons between epoxide and de-epoxide forms, dissipating excess light energy as heat. This study examined the xanthophyll cycle in microphytobenthos on a tidally exposed substrate at Browns River, Tasmania. Fv/Fm decreased from 0.52+0.01 to 0.47+0.01 at noon in surface samples and a decrease in the diadinoxanthin:chlorophyll-a ratio from 0.022+0.003 to 0.015+0.005 also suggests that the microphytobenthos was under physiological stress at noon. The results indicate that the cells exposed to light at the surface migrated deeper into the sediments and replenished the epoxide form of their xanthophylls. The results suggest that micrphytobenthos utilizes both behavioural and physiological strategies to survive in the dynamic intertidal environment.

Item Details

Item Type:Refereed Article
Keywords:xanthophyll, microphytobenthos, non-photochemical quenching of energy (NPQ), diatom, Australia, diadinoxanthin,
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Assessment and management of terrestrial ecosystems
UTAS Author:Jordan, L (Ms Leonie McCrossen)
UTAS Author:McMinn, A (Professor Andrew McMinn)
ID Code:62718
Year Published:2010 (online first 2009)
Web of Science® Times Cited:4
Deposited By:IASOS
Deposited On:2010-03-18
Last Modified:2017-04-11

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