Abstract
Photosynthetic processes play a key role in aquatic ecosystems. These processes are highly sensitive to the presence of toxicants, leading to an increase in their use as ecotoxicological endpoints. The use of chlorophyll-a fluorescence techniques to assess the impact of toxicants on the photosynthesis of the autotrophic component of fluvial biofilms has increased in the last decades. However, these photosynthetic endpoints are not currently used in water quality monitoring programs.
A review of the currently available literature—including studies dealing with toxicity assessment of both priority and emerging compounds—allowed the discussion of the pros and cons of their use as ecotoxicological endpoints in fluvial systems as well as their inclusion in regular monitoring programs.
Chlorophyll-a fluorescence measurements have the ability to detect effects of a large panel of chemical substances on the photosynthetic processes of fluvial biofilms, covering both functional and structural aspects of the biofilm community. Moreover, they might provide early warning signals of toxic effects.
Thus, the application of the chlorophyll-a fluorescence measurement is recommended as a complementary measurement of toxic stress in aquatic ecosystems. Their application is of special interest in the context of the Water Framework Directive (WFD, Directive 2000/60/EC), where the development of new structural and functional endpoints of the biological quality elements (e.g., biofilms) is required.
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Abbreviations
- AL:
-
Actinic light
- BQE:
-
Biological quality element
- F:
-
Fluorescence yield at the maximal reduced state
- Fe:
-
Ferrodoxin
- Fm:
-
Maximal fluorescence yield
- Fm′:
-
Fluorescence yield at actinic light steady state
- Fo:
-
Minimal fluorescence yield
- Fo(Bl):
-
Fluorescence signal linked to cyanobacteria group
- Fo(Br):
-
Fluorescence signal linked to diatoms’ algal group
- Fo(Gr):
-
Fluorescence signal linked to green-algae algal group
- Fo/Fv:
-
Efficiency of the water-splitting apparatus of PSII
- Fo′:
-
Fluorescence yield when actinic light is omitted
- Fv:
-
Variable fluorescence yield
- Fv/2:
-
Fluorescence measurment of plastoquinone pool
- ML:
-
Measuring light
- NPQ:
-
Non-photochemical quenching without measuring Fo′
- PAM:
-
Pulse amplitude modulated
- PEA:
-
Plant efficiency analyzer
- Pheo:
-
Pheophytin
- PQ:
-
Plastoquinone pool
- PQA :
-
Plastoquinone A
- PQB :
-
Plastoquinone B
- PS:
-
Photosystem
- PSI:
-
Photosystem I
- PSII:
-
Photosystem II
- qN:
-
Non-photochemical quenching
- qP:
-
Photochemical quenching
- SP:
-
Saturation pulse
- UQDrel :
-
Relative unquenched fluorescence
- WFD:
-
Water framework directive
- Φ′PSII :
-
Effective quantum yield of PSII
- Φ PSII :
-
Maximal quantum yield of PSII
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Acknowledgments
The authors would like to thank the authors of publications [20, 23, 29] to give us the permission to use some of their figures to illustrate PAM applications on biofilms. Also we thank Ulrich Schreiber to give us the permission to use a figure of his publication [89] to illustrate the typical chl-a fluorescence kinetics. This study was financed by the European project KEYBIOEFFECTS (MRTN-CT-2006-035695) and the Spanish project FLUVIALMULTISTRESS (CTM2009-14111-CO2-01).
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Corcoll, N., Ricart, M., Franz, S., Sans-Piché, F., Schmitt-Jansen, M., Guasch, H. (2012). The Use of Photosynthetic Fluorescence Parameters from Autotrophic Biofilms for Monitoring the Effect of Chemicals in River Ecosystems. In: Guasch, H., Ginebreda, A., Geiszinger, A. (eds) Emerging and Priority Pollutants in Rivers. The Handbook of Environmental Chemistry(), vol 19. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25722-3_4
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