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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Comparing alternatives for combining invertebrate and diatom assessment in stream quality classification

Tânia Mendes A , Ana Raquel Calapez B , Carmen L. Elias A , Salomé F. P. Almeida A and Maria João Feio B C
+ Author Affiliations
- Author Affiliations

A Department of Biology and GeoBioSciences, GeoTechnologies and GeoEngineering (GeoBioTec) Research Unit, University of Aveiro, 3810-193 Aveiro, Portugal.

B IMAR-CMA, Department of Life Sciences, University of Coimbra, Largo Marquês de Pombal, 3004-517 Coimbra, Portugal.

C Corresponding author. Email: mjf@ci.uc.pt

Marine and Freshwater Research 65(7) 612-623 https://doi.org/10.1071/MF13135
Submitted: 30 May 2013  Accepted: 7 October 2013   Published: 7 May 2014

Abstract

The present study aimed to determine if a predictive model integrating freshwater assemblages from different trophic levels (macroinvertebrates and diatoms) produces a more sensitive assessment of stream health than single-assemblage assessments combined a posteriori. For this purpose, individual and combined models based on two approaches (BEAST and RIVPACS) were developed for Portuguese streams: two for diatoms; two for macroinvertebrates; and two combining diatoms and macroinvertebrates as a single community. Twenty-three sites affected by organic contamination, industrial effluents and mine drainage were evaluated with the predictive models and also by the official biotic indices used in Portugal. The sensitivity of the RIVPACS assessment to disturbance was improved by the a priori combination of diatoms and macroinvertebrates, whereas for BEAST the a posteriori approaches were slightly more sensitive. Diatom and invertebrate indices combined a posteriori performed better than single-assemblage indices but with lower sensitivity than combined models. We conclude that the a priori combination of the two biological assemblages is valuable (more sensitive to disturbance) for the RIVPACS approach and that the a posteriori combination of assessments for individual biological elements may not always provide the most realistic indication of stream health.

Additional keywords: combined assessments, diatoms, ecological quality, macroinvertebrates, predictive models, streams.


References

Abbasi, T., and Abbasi, S. A. (2011). Water quality indices based on bioassessment: The biotic indices. Journal of Water and Health 9, 330–348.
Water quality indices based on bioassessment: The biotic indices.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXhtVajsbzN&md5=f7d44962a3aea83a2b10c72805f2299aCAS | 21942198PubMed |

Agência Portuguesa do Ambiente (2007). Atlas do Ambiente digital. Available at http://sniamb.apambiente.pt/webatlas/ (site maitained by the Ministério da Agricultura, do Mar, do Ambiente e do Ordenamento do Território) [accessed 15 February 2011]

Aguiar, F. C., Feio, M. J., and Ferreira, M. T. (2011). Choosing the best method for stream bioassessment using macrophyte communities: Indices and predictive models. Ecological Indicators 11, 379–388.
Choosing the best method for stream bioassessment using macrophyte communities: Indices and predictive models.Crossref | GoogleScholarGoogle Scholar |

Alahuhta, J., Vuori, K.-M., Hellsten, S., Järvinen, M., Olin, M., Rask, M., and Palomäki, A. (2009). Defining the ecological status of small forest lakes using multiple biological quality elements and palaeolimnological analysis. Archiv für Hydrobiologie 175, 203–216.
Defining the ecological status of small forest lakes using multiple biological quality elements and palaeolimnological analysis.Crossref | GoogleScholarGoogle Scholar |

Almeida, S. F. P., and Feio, M. J. (2012). DIATMOD: diatom predictive model for quality assessment of Portuguese running waters. Hydrobiologia 695, 185–197.
DIATMOD: diatom predictive model for quality assessment of Portuguese running waters.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XhtFOnu7jL&md5=86dd8c6cc11251156622bab88a771549CAS |

Almeida, S. F. P., Craveiro, S. C., and Calado, A. J. (2010). On the identity and distribution in Nothern Portugal of three Gomphonema species currently misidentified as Gomphonema clevei. Diatom Research 25, 13–27.
On the identity and distribution in Nothern Portugal of three Gomphonema species currently misidentified as Gomphonema clevei.Crossref | GoogleScholarGoogle Scholar |

Andrén, C., and Jarlman, A. (2008). Benthic diatoms as indicators of acidity in streams. Fundamental and Applied Limnology 173, 237–253.
Benthic diatoms as indicators of acidity in streams.Crossref | GoogleScholarGoogle Scholar |

Azrina, M. Z., Yap, C. K., Rahim, I. A., Ismail, A., and Tan, S. G. (2006). Anthropogenic impacts on the distribution and biodiversity of benthic macroinvertebrates and water quality of the Langat River, Peninsular Malaysia. Ecotoxicology and Environmental Safety 64, 337–347.
Anthropogenic impacts on the distribution and biodiversity of benthic macroinvertebrates and water quality of the Langat River, Peninsular Malaysia.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD28XlsVejt7g%3D&md5=8d7aa62d43b8890fb23dfada7cdbe99fCAS | 15964072PubMed |

Bailey, R. C., Norris, R. H., and Reynoldson, T. B. (2004). ‘Bioassessment of Freshwater Ecosystems: Using the Reference Condition Approach.’ (Springer-Verlag: New York.)

Bailey, R. C., Scrimgeour, G., Coté, D., Kehler, D., Linke, S., and Caof, Y. (2012). Bioassessment of stream ecosystems enduring a decade of simulated degradation: lessons for the real world. Canadian Journal of Fisheries and Aquatic Sciences 69, 784–796.
Bioassessment of stream ecosystems enduring a decade of simulated degradation: lessons for the real world.Crossref | GoogleScholarGoogle Scholar |

Barbosa, F. A. R., Callisto, M., and Galdean, N. (2001). The diversity of benthic macroinvertebrates as an indicator of water quality and ecosystem health: a case study for Brazil. Aquatic Ecosystem Health & Management 4, 51–59.
The diversity of benthic macroinvertebrates as an indicator of water quality and ecosystem health: a case study for Brazil.Crossref | GoogleScholarGoogle Scholar |

Barbour, M. T., Gerritsen, J., Snyder, B. D., and Stribling, J. B. (1999). ‘Rapid Bioassessment Protocols for Use in Streams and Wadeable Rivers: Periphyton, Benthic Macroinvertebrates and Fish, 2nd edn.’ EPA 841-B-99-002. (US Environmental Protection Agency, Office of Water: Washington, DC.)

Bere, T., and Tundisi, J. (2011). Applicability of borrowed diatom-based water quality assessment indices in streams around São Carlos-SP, Brazil. Hydrobiologia 673, 179–192.
Applicability of borrowed diatom-based water quality assessment indices in streams around São Carlos-SP, Brazil.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXpt1Oqsb0%3D&md5=ec72980c53e6f223d4c2cb8c85df8efcCAS |

Carlisle, D. M., Hawkins, C. P., Meador, M. R., Potapova, M., and Falcone, J. (2008). Biological assessments of Appalachian streams based on predictive models for fish, macroinvertebrate, and diatom assemblages. Journal of the North American Benthological Society 27, 16–37.
Biological assessments of Appalachian streams based on predictive models for fish, macroinvertebrate, and diatom assemblages.Crossref | GoogleScholarGoogle Scholar |

Caroni, R., Bund, W., Clarke, R. T., and Johnson, R. K. (2013). Combination of multiple biological quality elements into waterbody assessment of surface waters. Hydrobiologia 704, 437–451.

Cemagref (1982). Étude des methods biologiques d’appréciation quantitative de la qualité dês eaux. Rapport Divison Qualité dês Eaux Cemagref Lyon. Agence de l’Eau Rhône-Méditerranée-Corse, Lyon.

Charles, D. F. (1996). Use of algae for monitoring rivers in the United States, some examples. In ‘Use of Algae for Monitoring Rivers’. (Eds B. Whitton, and E. Rott.),Vol. I, pp. 109–118. (STUDIA Studentenförderungs-Ges.m.b.H, Innsbruck, Austria)

Chessman, B., Growns, I., Curreys, J., and Plunkett-Cole, N. (1999). The influence of taxonomic level on the performance of a predictive model for water quality assessment. Freshwater Biology 41, 317–331.
The influence of taxonomic level on the performance of a predictive model for water quality assessment.Crossref | GoogleScholarGoogle Scholar |

Clarke, R. T., Wright, J. F., and Furse, M. T. (2003). RIVPACS models for predicting the expected macroinvertebrate fauna and assessing the ecological quality of rivers. Ecological Modelling 160, 219–233.
RIVPACS models for predicting the expected macroinvertebrate fauna and assessing the ecological quality of rivers.Crossref | GoogleScholarGoogle Scholar |

Cooper, S. R. (1995). Chesapeake Bay watershed historical land use: impact on water quality and diatom communities. Ecological Applications 5, 703–723.
Chesapeake Bay watershed historical land use: impact on water quality and diatom communities.Crossref | GoogleScholarGoogle Scholar |

Descy, J-P., and Coste, M. (1988). Utilisation des Diatomées Benthiques pour L'Évaluation de la Qualité des Eaux Courantes. Troisieme Rapport D’Avancement. UNECED – CCE B-71-23, 41 pp.

European Commission Parliament and Council (2000). Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy. European Commission Parliament and Council, Luxembourg. Available at http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32000L0060:EN:HTML

Environment Agency (2003). River Habitat Survey in Britain and Ireland. Field Survey Guidance Manual: 2003 version. EA, SEPA, Environment and Heritage Service, Luxembourg

Feio, M. J., and Poquet, J. M. (2011). Predictive models for freshwater biological assessment: statistical approaches, biological elements and the Iberian Peninsula experience: a review. International Review of Hydrobiology 96, 321–346.
Predictive models for freshwater biological assessment: statistical approaches, biological elements and the Iberian Peninsula experience: a review.Crossref | GoogleScholarGoogle Scholar |

Feio, M. J., Norris, R. H., Graça, M. A. S., and Nichols, S. (2009a). Water quality assessment of Portuguese streams: regional or national predictive models? Ecological Indicators 9, 791–806.
Water quality assessment of Portuguese streams: regional or national predictive models?Crossref | GoogleScholarGoogle Scholar |

Feio, M. J., Almeida, S. F. P., Craveiro, S. C., and Calado, A. J. (2009b). A comparison between biotic indices and predictive models in stream water quality assessment based on benthic diatom communities. Ecological Indicators 9, 497–507.
A comparison between biotic indices and predictive models in stream water quality assessment based on benthic diatom communities.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXnvVOrt78%3D&md5=12b4dfc67c886660e688f737432e109eCAS |

Feio, M. J., Alves, T., Boavida, M., Medeiros, A., and Graça, M. A. S. (2010). Functional indicators of stream health: a river-basin approach. Freshwater Biology 55, 1050–1065.
Functional indicators of stream health: a river-basin approach.Crossref | GoogleScholarGoogle Scholar |

Feio, M. J., Aguiar, F. C., Almeida, S. F. P., Ferreira, J., Ferreira, M. T., Elias, C., Serra, S. R. S., Buffagni, A., Cambra, J., Chauvin, C., Delmas, F., Dörflinger, G., Erba, S., Flor, N., Ferréol, M., Germ, M., Mancini, L., Manolaki, P., Marcheggiani, S., Minciardi, M. R., Munné, A., Papastergiadou, E., Prat, N., Puccinelli, C., Rosebery, J., Sabater, S., Ciadamidaro, S., Tornés, E., Tziortzis, I., Urbanic, G., and Vieira, C. (2013). Least disturbed conditions for European Mediterranean rivers. The Science of the Total Environment , .
Least disturbed conditions for European Mediterranean rivers.Crossref | GoogleScholarGoogle Scholar | 23993684PubMed |

Ferreira, J., Bernardo, J. M., and Alves, M. H. (2008). Exercício de intercalibração em rios no âmbito da Directiva-Quadro da Água. In ‘Proceedings of the 9th Congresso da Água: Água, Sede de Sustentabilidade, Lisboa’. pp. 1–16. APRH.

Harding, W., Archibald, C., and Taylor, J. (2005). The relevance of diatoms for water quality assessment in South Africa: a position paper. Water S.A. 31, 41–46.
The relevance of diatoms for water quality assessment in South Africa: a position paper.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXislSktL4%3D&md5=780938006cad3a67f436a40e7ea8e8cfCAS |

Hatton-Ellis, T. (2008). The hitchhiker’s guide to the Water Framework Directive. Aquatic Conservation: Marine and Freshwater Ecosystems 18, 111–116.
The hitchhiker’s guide to the Water Framework Directive.Crossref | GoogleScholarGoogle Scholar |

INAG I.P. (2008a). Protocolo de amostragem e análise para o FITOBENTOS – DIATOMÁCEAS. Ministério do Ambiente, do Ordenamento do Território e do Desenvolvimento Regional. Institudo da Água: Lisboa, Portugal

INAG I.P. (2008b). Protocolo de amostragem e análise para os MACROINVERTEBRADOS BENTÓNICOS. Ministério do Ambiente, do Ordenamento do Território e do Desenvolvimento Regional. Instituto da Água: Lisboa, Portugal

INAG I.P. (2009). Critérios para a Classificação do Estado das Massas de Água Superficiais: Rios e Albufeiras. Ministério do Ambiente, do Ordenamento do Território e do Desenvolvimento Regional. Instituto da Água: Lisboa, Portugal

Irvine, K. (2004). Classifying ecological status under the European Water Framework Directive: the need for monitoring to account for natural variability. Aquatic Conservation: Marine and Freshwater Ecosystems 14, 107–112.
Classifying ecological status under the European Water Framework Directive: the need for monitoring to account for natural variability.Crossref | GoogleScholarGoogle Scholar |

Kelly, M. G., Cazaubon, A., Coring, E., Dell’Uomo, A., Ector, L., Goldsmith, B., Guasch, H., Hürlimann, J., Jarlam, A., Kawecka, B., Kwandrans, J., Laugaste, R., Lindstrøm, E.-A., Leitao, M., Marvan, P., Padisák, J., Pipp, E., Prygiel, J., Rott, E., Sabater, S., van Dam, H., and Vizinet, J. (1998). Recommendations for the routine sampling of diatoms for water quality assessments in Europe. Journal of Applied Phycology 10, 215–224.
Recommendations for the routine sampling of diatoms for water quality assessments in Europe.Crossref | GoogleScholarGoogle Scholar |

Kenney, M. A., Sutton-Grier, A. E., Smith, R. F., and Gresens, S. E. (2009). Benthic macroinvertebrates as indicators of water quality: the intersection of science and policy. Terrestrial Arthropod Reviews 2, 99–128.
Benthic macroinvertebrates as indicators of water quality: the intersection of science and policy.Crossref | GoogleScholarGoogle Scholar |

Krammer, K. (2000). ‘Diatoms of Europe: Diatoms of the European Inland Waters and Comparable Habitats.’ (A.R.G. Gantner Verlag K.G: Ruggell, Liechtenstein.)

Krammer, K. (2002). ‘Diatoms of Europe: Diatoms of the European Inland Waters and Comparable Habitats’. (A.R.G. Gantner Verlag K.G: Ruggell, Liechtenstein.)

Krammer, K. (2003). ‘Diatoms of Europe: Diatoms of the European Inland Waters and Comparable Habitats’. (A.R.G. Gantner Verlag K.G.: Ruggell, Liechtenstein.)

Krammer, K., and Lange-Bertalot, H. (1986). ‘Süßwasserflora von Mitteleuropa. Baccillariophyceae 1 Teil: Naviculaceae’. (Gustav Fischer Verlag: Stuttgart.)

Krammer, K., and Lange-Bertalot, H. (1988). ‘Süßwasserflora von Mitteleuropa. Baccillariophyceae 2 Teil: Bacillariaceae, Epithemiaceae, Surirellaceae’. (Gustav Fischer Verlag: Stuttgart.)

Krammer, K., and Lange-Bertalot, H. (1991a). ‘Süßwasserflora von Mitteleuropa. Baccillariophyceae 3 Teil: Centrales, Fragilariaceae, Eunotiaceae’. (Gustav Fischer Verlag: Stuttgart.)

Krammer, K., and Lange-Bertalot, H. (1991b). ‘Süßwasserflora von Mitteleuropa. Baccillariophyceae 4 Teil: Achnanthaceae, Kritische Ergänzungen zu Navicula (Lineolatae) und Gomphonema’. (Gustav Fischer Verlag: Stuttgart.)

Lecointe, C., Coste, M., and Prygiel, J. (1993). “Omnidia”: software for taxonomy, calculation of diatom indices and inventories management. Hydrobiologia 269–270, 509–513.
“Omnidia”: software for taxonomy, calculation of diatom indices and inventories management.Crossref | GoogleScholarGoogle Scholar |

Levkov, Z. (2009). ‘Diatoms of Europe: Diatoms of the European Inland Waters and Comparable Habitats.’ (A.R.G. Gantner Verlag K.G: Ruggell, Liechtenstein.)

Linke, S., Norris, R. H., Faith, D. P., and Stockwell, D. (2005). ANNA: A new prediction method for bioassessment programs. Freshwater Biology 50, 147–158.
ANNA: A new prediction method for bioassessment programs.Crossref | GoogleScholarGoogle Scholar |

Mann, D. G., Sato, S., Trobajo, R., Vanormelingen, P., and Souffreau, C. (2010). DNA barconding for species identification and discovery in diatoms. Criptogamie Algologie 31, 557–577.

Mazor, R. D., Reynoldson, T. B., Rosenberg, D. M., and Resh, V. H. (2006). Effects of biotic assemblage, classification, and assessment method on bioassessment performance. Canadian Journal of Fisheries and Aquatic Sciences 63, 394–411.
Effects of biotic assemblage, classification, and assessment method on bioassessment performance.Crossref | GoogleScholarGoogle Scholar |

Mendes, T., Almeida, S. F. P., and Feio, M. J. (2012). Assessment of rivers using diatoms: effect of substrate and evaluation method. Fundamental and Applied Limnology 179, 267–279.
Assessment of rivers using diatoms: effect of substrate and evaluation method.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhtlCgsLfF&md5=d8b4ac5aa2fef99084cb4439379a558eCAS |

Muralidharan, M., Selvakumar, C., Sundar, S., and Raja, M. (2010). Macroinvertebrates as potential indicators of environmental quality. International Journal of Biological Technology 1, 23–28.

Ostermiller, J. D., and Hawkins, C. P. (2004). Effects of sampling error on bioassessments of stream ecosystems: applications to RIVPACS-type models. Journal of the North American Benthological Society 23, 363–382.
Effects of sampling error on bioassessments of stream ecosystems: applications to RIVPACS-type models.Crossref | GoogleScholarGoogle Scholar |

Passy, S. I., Bode, R. W., Carlson, D. M., and Novak, M. A. (2004). Comparative environmental assessment in the studies of benthic diatom, macroinvertebrate, and fish communities. International Review of Hydrobiology 89, 121–138.
Comparative environmental assessment in the studies of benthic diatom, macroinvertebrate, and fish communities.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXltVarurg%3D&md5=4f2fdec239456a1fd36178b5b84892caCAS |

Pont, D., Hugueny, B., Beier, U., Goffaux, D., Melcher, A., Noble, R., Rogers, C., Roset, N., and Schmutz, S. (2006). Assessing river biotic condition at a continental scale: a European approach using functional metrics and fish assemblages. Journal of Applied Ecology 43, 70–80.
Assessing river biotic condition at a continental scale: a European approach using functional metrics and fish assemblages.Crossref | GoogleScholarGoogle Scholar |

Rask, M., Vouri, K.-M., Hämäläinen, H., Järvinen, M., Hellsten, S., Mykrä, H., Arvola, L., Ruuhijärvi, J., Jyväsjärvi, J., Kolari, I., Olin, M., Salonen, E., and Valkeajärvi, P. (2011). Ecological classification of large lakes in Finland: comparison of classification approaches using multiple quality elements. Hydrobiologia 660, 37–47.
Ecological classification of large lakes in Finland: comparison of classification approaches using multiple quality elements.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXhsFCksb%2FI&md5=0beccaffef854f2ca6e3d3b27bb0ab53CAS |

Reynoldson, T. B., Bailey, R. C., Day, K. E., and Rosenberg, D. M. (1995). Biological guidelines for freshwater sediment based on BEnthic Assessment of SedimenT (the BEAST) using a multivariate approach for predicting biological state. Australian Journal of Ecology 20, 198–219.
Biological guidelines for freshwater sediment based on BEnthic Assessment of SedimenT (the BEAST) using a multivariate approach for predicting biological state.Crossref | GoogleScholarGoogle Scholar |

Reynoldson, T. B., Norris, R. H., Resh, V. H., Day, K. E., and Rosenberg, D. M. (1997). The reference condition: a comparison of multimetric and multivariate approaches to assess water-quality impairment using benthic macroinvertebrates. Journal of the North American Benthological Society 16, 833–852.
The reference condition: a comparison of multimetric and multivariate approaches to assess water-quality impairment using benthic macroinvertebrates.Crossref | GoogleScholarGoogle Scholar |

Schumtz, S. (2004). Development, evaluation & implementation of a standardised fish-based assessment method for the ecological status of European rivers: a contribution to the Water Framework Directive (FAME). Scientific achievements, Sections 5 & 6 (Final Report). Institute for Hydrobiology and Aquatic Ecosystem Management University of Natural Resources and Applied Life Sciences, Vienna.

Simpson, J. C., and Norris, R. H. (2000). Biological assessment of river quality: development of AUSRIVAS models and outputs. In ‘Assessing the Biological Quality of Fresh Waters: RIVPACS and Other Techniques’. (Eds J. F. Wright, D, W, Sutcliffe and M. T. Furse.) pp. 125–142. (Freshwater Biological Association: Ambleside, UK.).

Solak, C. N., and Acs, E. (2011). Water quality monitoring in European and Turkish Rivers using diatoms. Turkish Journal of Fisheries and Aquatic Sciences 11, 329–337.

Van Sickle, J., Hawkins, C. P., Larsen, D. P., and Herlihy, A. T. (2005). A null model for the expected macroinvertebrate assemblage in streams. Journal of the North American Benthological Society 24, 178–191.
A null model for the expected macroinvertebrate assemblage in streams.Crossref | GoogleScholarGoogle Scholar |

Van Sickle, J., Huff, D. D., and Hawkins, C. P. (2006). Selecting discriminant function models for predicting the expected richness of aquatic macroinvertebrates. Freshwater Biology 51, 359–372.
Selecting discriminant function models for predicting the expected richness of aquatic macroinvertebrates.Crossref | GoogleScholarGoogle Scholar |

Van Sickle, J., Larsen, D. P., and Hawkins, C. P. (2007). Exclusion of rare taxa affects performance of the O/E index in bioassessments. Journal of the North American Benthological Society 26, 319–331.
Exclusion of rare taxa affects performance of the O/E index in bioassessments.Crossref | GoogleScholarGoogle Scholar |

Werum, M., and Lange-Bertalot, H. (2004). ‘Iconographia Diatomologica: Annotated Diatom Micrographs.’ (A.R.G. Gantner Verlag K.G: Ruggell, Liechtenstein.)

Wright, J. F. (1995). Development and use of a system for predicting the macroinvertebrate fauna in flowing waters. Australian Journal of Ecology 20, 181–197.
Development and use of a system for predicting the macroinvertebrate fauna in flowing waters.Crossref | GoogleScholarGoogle Scholar |

Wright, J. F., Moss, D., Armitage, P. D., and Furse, M. T. (1984). A preliminary classification of running-water sites in Great Britain based on macroinvertebrate species and the prediction of community type using environmental data. Freshwater Biology 14, 221–256.
A preliminary classification of running-water sites in Great Britain based on macroinvertebrate species and the prediction of community type using environmental data.Crossref | GoogleScholarGoogle Scholar |

Wright, J. F., Furse, M. T., and Armitage, P. D. (1993). RIVPACS – a technique for evaluating the biological quality of rivers in the U.K. European Water Pollution Control 3, 15–25.

Ylla, I., Romaní, A. M., and Sabater, S. (2007). Differential effects of nutrients and light on the primary production of stream algae and mosses. Archiv für Hydrobiologie 170, 1–10.
Differential effects of nutrients and light on the primary production of stream algae and mosses.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXjsVansQ%3D%3D&md5=4fa43778acd5b8a4c4e6b1e47d61017dCAS |

Zelinka, M., and Marvan, P. (1961). Zur Präzisierung der biolo-gischen Klassifikation der Reinheit fließender Gewässer. Archiv für Hydrobiologie 57, 389–407.