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Diurnal changes of photoadaptive pigments in microphytobenthos

Published online by Cambridge University Press:  21 October 2009

Leonie Jordan ,
Andrew McMinn  and
Peter Thompson
Leonie Jordan
Affiliation:
Institute of Antarctic and Southern Ocean studies, University of Tasmania, Box 252-77, Hobart 7001, Tasmania, Australia
Andrew McMinn*
Affiliation:
Institute of Antarctic and Southern Ocean studies, University of Tasmania, Box 252-77, Hobart 7001, Tasmania, Australia
Peter Thompson
Affiliation:
Marine and Atmospheric Research, CSIRO, Hobart 7001, Tasmania, Australia
*
Correspondence should be addressed to: Andrew McMinn, Institute of Antarctic and Southern Ocean studies, University of Tasmania, Box 252-77, Hobart 7001, Tasmania, Australia email: Andrew.McMinn@utas.edu.au
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Abstract

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.

Keywords

xanthophyllmicrophytobenthosnon-photochemical quenching of energy (NPQ)diatomAustraliadiadinoxanthindiatoxanthin
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 90 , Issue 5 , August 2010 , pp. 1025 - 1032
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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