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Diurnal changes of photoadaptive pigments in microphytobenthos

journal contribution
posted on 2023-05-17, 02:14 authored by Jordan, L, Andrew McMinnAndrew McMinn, Thompson, P
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.

History

Publication title

Marine Biological Association of The United Kingdom. Journal

Volume

90

Issue

5

Pagination

1025-1032

ISSN

0025-3154

Department/School

Institute for Marine and Antarctic Studies

Publisher

Cambridge Univ Press

Place of publication

40 West 20Th St, New York, USA, Ny, 10011-4211

Rights statement

Copyright © Marine Biological Association of the United Kingdom 2009

Repository Status

  • Restricted

Socio-economic Objectives

Assessment and management of terrestrial ecosystems

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