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    Adjustment of photoprotection to tidal conditions in intertidal seagrasses

    Access Status
    Fulltext not available
    Authors
    Kohlmeier, D.
    Pilditch, C.
    Bornman, Janet
    Bischof, K.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Kohlmeier, D. and Pilditch, C. and Bornman, J. and Bischof, K. 2016. Adjustment of photoprotection to tidal conditions in intertidal seagrasses. Journal of the Marine Biological Association of the United Kingdom. TBA: pp. 1-9.
    Source Title
    Journal of the Marine Biological Association of the United Kingdom
    DOI
    10.1017/S0025315416001090
    ISSN
    0025-3154
    School
    School of Management
    URI
    http://hdl.handle.net/20.500.11937/51864
    Collection
    • Curtin Research Publications
    Abstract

    Copyright © Marine Biological Association of the United Kingdom 2016Light adaptive strategies were studied in a comparative analysis of the congeneric seagrass species Zostera muelleri and Zostera marina at two case study areas in New Zealand and Germany. Surveys in intertidal seagrass meadows were conducted from pre-dawn until sunset on days when either low or high tide coincided with noon. The results show marked fluctuations of photophysiology (optimum and effective quantum yield, non-photochemical quenching, cycling of xanthophyll cycle (XC) pigments) over daily and tidal cycles. At both locations, we observed a near complete conversion (de-epoxidation) of violaxanthin to zeaxanthin at times with high irradiance and a rapid and complete re-epoxidation under subsequent lower light conditions. At the New Zealand site we also observed significantly larger XC-pigment pool sizes in seagrass leaves sampled in a week when low tide coincided with noon (larger daily fluence and higher maximum irradiance), compared with leaves sampled in a week when high tide was at noon. This dynamic adjustment of xanthophyll pool size has not been previously reported for intertidal seagrasses. It adds to our understanding of an important adaptive feature in a highly dynamic light environment and to the general ecology and adaptability of seagrasses.

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