C. S. Galli and P. S. Abe, “Availability, Pollution and Eutrophication of Water,” Associacao Instituto Internacional de Ecologia e Gerenciamento Ambiental, Sao Carlos, 2012, pp. 165-174.
 M. A. Oliveira, L. Torgan, E. A. Lobo and A. Schwarzbold, “Association of Periphitic Diatom Specieson Artificial Substrate in Lotic Environments in the Arroio Sampaio Basin, RS, Brazil: Relationships with Abiotic Variables,” Revista Brasileira de Biologia, Vol. 61, No. 4, 2001, pp. 523-540.
 C. E. Wetzel, E. A. Lobo, M. A. Oliveira, D. Bes and G. Hermany, “Epilithic Diatoms Related to Environmental Factors in Different Reaches of the Rivers Pardo and Pardinho, Pardo River Hydrographic Basin, RS, Brazil: Preliminary Results,” Caderno de Pesquisa Série Biologia, Vol. 14, No. 2, 2002, pp. 17-38.
 E. A. Lobo, V. L. M. Callegaro, G. Hermany, D. Bes, C. E. Wetzel and M. A. Oliveira, “Use of Epilithic Diatoms as Bioindicators from Lotic Systems in Southern Brazil, with Special Emphasis on Eutrophication,” Acta Limnologica Brasiliensia, Vol. 16, No. 1, 2004, pp. 25-40.
 E. A. Lobo, D. Bes, L. Tudesque and L. Ector, “Water Quality Assessment of the Pardinho River, RS, Brazil, Using Epilithic Diatom Assemblages and Faecal Coliforms as Biological Indicators,” Vie & Milieu, Vol. 54, No. 2/3, 2004, pp. 115-126.
 E. A. Lobo, V. L. Callegaro, C. E. Wetzel, G. Hermany and D. Bes, “Water Quality Study of Condor and Capivara Streams, Porto Alegre Municipal District, RS, Brazil, Using Epilithic Diatoms Biocenoses as Bioindicators,” Oceanological and Hydrobiological Studies, Vol. 33, No. 2, 2004, pp. 77-93.
 E. A. Lobo, V. L. Callegaro, G. Hermany, N. Gomez and L. Ector, “Review of the Use of Microalgae in South America for Monitoring Rivers, with Special Reference to Diatoms,” Vie & Milieu, Vol. 54, No. 2/3, 2004, pp. 105-114.
 E. A. Lobo, C. E. Wetzel, L. Ector, K. Katoh, S. Blanco and S. Mayama, “Response of Epilithic Diatom Community to Environmental Gradients in Subtropical Temperate Brazilian Rivers,” Limnetica, Vol. 29, No. 2, 2010, pp. 323-340.
 G. Hermany, A. Schwarzbold, E. A. Lobo and M. A. Oliveira, “Ecology of the Epilithic Diatom Community in a Low-Order Stream System of the Guaíba Hydrographical Region: Subsidies to the Environmental Monitoring of Southern Brazilian Aquatic Systems,” Acta Limnologica Brasiliensia, Vol. 18, No. 1, 2006, pp. 25-40.
 S. E. Salomoni, O. Rocha, V. L Callegaro and E. A. Lobo, “Epilithic Diatoms as Indicators of Water Quality in the Gravataí River, Rio Grande do Sul, Brazil,” Hydrobiologia, Vol. 559, No. 1, 2006, pp. 233-246.
 S. E. Salomoni, O. Rocha, G. Hermany and E. A. Lobo, “Application of Water Quality Biological Indices Using Diatoms as Bioindicators in the Gravataí River, RS, Brazil,” Brazilian Journal of Biology, Vol. 71, No. 4, 2011, pp. 949-959.
 M. Schuch, E. F. Abreu-Júnior and E. A. Lobo, “Water Quality of Urban Streams, Santa Cruz do Sul, Rio Grande do Sul, Based on Physical, Chemical and Biological Analyses,” Bioikos, Campinas, Vol. 26, No. 1, 2012, pp. 3-12.
 J. G. Tundisi, “Limnology and Water Resources Management in Brazil,” Projeto Brasil das águas, 2006.
 E. A. Lobo, V. L. M. Callegaro and E. P. Bender, “Use of Epilithic Diatoms as Water Quality Indicators in Rivers and Streams of the Guaiba Hydrographic Region, RS, Brazil,” EDUNISC, Santa Cruz do Sul, 2002.
 IBGE, “Population Census IBGE—Brazilian Institute of Geography and Statistics,” 2010.
 E. A. Lobo and G. Leighton, “Community Structures of Planktonic Phytocenosis in the Lower Reaches of Rivers and Streams of Central Zone of Chile,” Revista Biología Marina, Valparaíso, Vol. 22, 1986, pp. 1-29.
 E. A. Lobo, A. B. Costa and A. Kirst, “Water Quality Assessment of Sampaio, Bonito and Grande Streams, City of Mato Leitao, RS, Brazil, According to the Resolution CONAMA 20/86,” Revista Redes, Santa Cruz do Sul, Vol. 4, No. 2, 1999, pp. 129-146.
 L. M. Rodrigues and E. A. Lobo, “Analysisof Epilithic Diatoms Community Structure in the Sampaio Stream, City of Mato Leitao, RS, Brazil,” Caderno de Pesquisa, Série Botanica, Santa Cruz do sul, Vol. 12, No. 2, 2000, pp. 5-27.
 E. A. Lobo, K. Katoh and Y. Aruga, “Response of Epilithic Diatom Assemblages to Water Pollution in Rivers Located in the Tokyo Metropolitan Area, Japan,” Freshwater Biology, Vol. 34, No. 1, 1995, pp. 191-204.
 H. Van Dam, A. Mertens and J. Sinkeldam, “A Coded Checklist and Ecological Indicator Values of Freshwater Diatoms from the Netherlands,” Netherlands Journal of Aquatic Ecology, Vol. 28, No. 1, 1994, pp. 117-133.
 M. G. M. Souza, “Analysis of Epilithic Diatoms Community Structure in the Monjolinho River (Impacted by Organic Pollution), City of Sao Carlos, Sao Paulo, Southeast Brazil,” Ph.D. Dissertation, Universidade Federal de Sao Carlos, Sao Carlos, 2002.
 S. E. Salomoni, O, Rocha, G. Hermany and E. A. Lobo, “Application of Water Quality Biological Indices Using Diatoms as Bioindicators in the Gravataí River, RS, Brazil,” Brazilian Journal of Biology, Vol. 71, No. 4, 2011, pp. 949-959.
 T. Bere and J. G. Tundisi, “Weighted Average Regression and Calibration of Conductivity and pH of Benthic Diatom Assemblages in Streams Influenced by Urban Pollution, Sao Carlos, SP, Brazil,” Acta Limnologica Brasiliensia, Vol. 21, No. 3, 2009, pp. 317-325.
 T. Bere, “Benthic Diatom Community Structure and Habitat Preferences along an Urban Pollution Gradient in the Monjolinho River, Sao Carlos, SP, Brazil,” Acta Limnologica Brasiliensia, Vol. 22, No. 1, 2010, pp. 80-92.