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

*Bijbehorende auteur voor dit werk

    OnderzoeksoutputAcademicpeer review

    14 Citaten (Scopus)


    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.

    Originele taal-2English
    Pagina's (van-tot)957-966
    Aantal pagina's10
    TijdschriftNew Phytologist
    Nummer van het tijdschrift3
    StatusPublished - jun-2005

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