Is UV-B radiation affecting charophycean algae in shallow freshwater systems?

NVJ de Bakker*, PM van Bodegom, WH van de Poll, P Boelen, E Nat, J Rozema, R Aerts

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    13 Citations (Scopus)

    Abstract

    The objective of this study was to determine the effects of UV-B radiation on charophycean algae under natural conditions, since charophytes enhance water transparency in freshwater systems and levels of UV-B radiation have increased by ozone depletion.

    Potential and actual UV-B effects were studied by combining a glasshouse experiment in which plants were exposed to various levels of UV-B radiation and field measurements in two freshwater systems dominated by charophytes in the Netherlands.

    The glasshouse experiment showed that charophytes were sensitive to UV-B radiation. UV-B radiation negatively affected growth, while it increased levels of DNA damage in Chara aspera. Moreover, the charophytes did not seem to develop UV-B screens to protect against UV-B radiation since no increase in UV-B absorbing compounds was found.

    At field conditions, both spectroradiometrical measurements and DNA dosimeters showed that UV-B radiation was attenuated quickly in both freshwater systems, indicating that UV-B does not reach the submerged charophyte vegetation. However, specific conditions, like fluctuating water tables, may result in UV-B exposure to charophytes for certain periods annually.

    Original languageEnglish
    Pages (from-to)957-966
    Number of pages10
    JournalNew Phytologist
    Volume166
    Issue number3
    DOIs
    Publication statusPublished - Jun-2005

    Keywords

    • attenuation coefficients
    • charophycean algae
    • DNA damage
    • DNA dosimeters
    • freshwater ecosystems
    • growth
    • UV-B absorbing compounds
    • UV-B radiation
    • SOLAR ULTRAVIOLET-RADIATION
    • INDUCED DNA-DAMAGE
    • DISSOLVED ORGANIC-CARBON
    • TERRESTRIAL ECOSYSTEMS
    • OZONE DEPLETION
    • REPAIR
    • LAKES
    • PHOTOREACTIVATION
    • ATTENUATION
    • MACROPHYTES

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