Chl-a fluorescence parameters as biomarkers of metal toxicity in fluvial biofilms: an experimental study
In: Hydrobiologia, Jg. 673 (2011-05-27), S. 119-136
Online
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Zugriff:
A study was carried out to evaluate the sensitivity of different chlorophyll-a (chl-a) fluorescence parameters measured in freshwater biofilms as metal pollution biomarkers of short- and long-term metal exposures at environmentally realistic concentrations. A microcosm experiment was performed using indoor channels. Mature biofilms were exposed from hours to weeks to three different treatments: No-Metal, Zn (400 μg l−1); and Zn plus Cd (400 μg l−1 and 20 μg l−1, respectively). Metal concentration was based on a real case study: the Riou-Mort River (France). Biofilms exposed to Zn bioaccumulated similar Zn contents per dry weight to those exposed to the mixture (Zn plus Cd) causing a similar inhibition of the effective quantum yield $$(\Upphi_{\text{M}}^{\prime})$$ during the first hours of exposure. A reduction of the algal biomass, a shift in the community composition (a high reduction of diatoms), a reduction of the maximal quantum yield (ΦM) and a strong reduction of non-photochemical quenching (NPQ) were observed from day 14 until the end of the experiment (35 days). The results indicate that the effects of the metal mixture present in the Riou-Mort on biofilms could be attributed to Zn toxicity. The use of a set of chl-a fluorescence measurements, including photochemical and NPQ parameters, are recommended as a reliable biomarker tool box to evaluate both short- and long-term effects of metals on biofilms containing oxygenic photoautotrophs, suggesting its use in field applications.
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Chl-a fluorescence parameters as biomarkers of metal toxicity in fluvial biofilms: an experimental study
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Autor/in / Beteiligte Person: | Bonet, Berta ; Corcoll, Natàlia ; Guasch, Helena ; Leira, Manel |
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Zeitschrift: | Hydrobiologia, Jg. 673 (2011-05-27), S. 119-136 |
Veröffentlichung: | Springer Science and Business Media LLC, 2011 |
Medientyp: | unknown |
ISSN: | 1573-5117 (print) ; 0018-8158 (print) |
DOI: | 10.1007/s10750-011-0763-8 |
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