Every fifth published metagenome is not available to science

• Ester M. Eckert ,

  Contributed equally to this work with: Ester M. Eckert, Andrea Di Cesare, Diego Fontaneto

  Affiliation Molecular Ecology Group (MEG), Water Research Institute, National Research Council of Italy, Verbania Pallanza, Italy

  http://orcid.org/0000-0002-7314-1715

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• Andrea Di Cesare ,

  Contributed equally to this work with: Ester M. Eckert, Andrea Di Cesare, Diego Fontaneto

  Affiliation Molecular Ecology Group (MEG), Water Research Institute, National Research Council of Italy, Verbania Pallanza, Italy

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• Diego Fontaneto ,

  Contributed equally to this work with: Ester M. Eckert, Andrea Di Cesare, Diego Fontaneto

  Affiliation Molecular Ecology Group (MEG), Water Research Institute, National Research Council of Italy, Verbania Pallanza, Italy

  http://orcid.org/0000-0002-5770-0353

  ⨯
• Thomas U. Berendonk,

  Affiliation Technische Universität Dresden Institut für Hydrobiologie, Dresden, Germany

  ⨯
• Helmut Bürgmann,

  Affiliation Eawag, Swiss Federal Institute of Aquatic Science and Technology, Kastanienbaum, Switzerland

  http://orcid.org/0000-0002-5651-5906

  ⨯
• Eddie Cytryn,

  Affiliation Institute of Soil Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, Rishon Lezion, Israel

  ⨯
• Despo Fatta-Kassinos,

  Affiliation Department of Civil and Environmental Engineering and Nireas-International Water Research Center, University of Cyprus, Nicosia, Cyprus

  ⨯
• Andrea Franzetti,

  Affiliation University of Milano Bicocca, Milan, Italy

  http://orcid.org/0000-0003-1279-9940

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• D. G. Joakim Larsson,

  Affiliations Centre for Antibiotic Resistance Research (CARe), University of Gothenburg, Gothenburg, Sweden, Department of Infectious Diseases, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

  http://orcid.org/0000-0002-5496-0328

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• Célia M. Manaia,

  Affiliation Universidade Católica Portuguesa, CBQF—Centro de Biotecnologia e Química Fina–Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal

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• Amy Pruden,

  Affiliation Department of Civil & Environmental Engineering, Blacksburg, Virginia, United States of America

  http://orcid.org/0000-0002-3191-6244

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• Andrew C. Singer,

  Affiliation UK Centre for Ecology & Hydrology, Wallingford, United Kingdom

  http://orcid.org/0000-0003-4705-6063

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• Nikolina Udikovic-Kolic,

  Affiliation Division for Marine and Environmental Research, Rudjer Boskovic Institute, Zagreb, Croatia

  ⨯
• Gianluca Corno

  * E-mail: gianluca.corno@cnr.it

  Affiliation Molecular Ecology Group (MEG), Water Research Institute, National Research Council of Italy, Verbania Pallanza, Italy

  http://orcid.org/0000-0002-7423-8797

  ⨯