Butterfly abundance declines over 20 years of systematic monitoring in Ohio, USA

• Tyson Wepprich ,

  Roles Conceptualization, Formal analysis, Methodology, Visualization, Writing – original draft, Writing – review & editing

  * E-mail: tyson.wepprich@oregonstate.edu

  Affiliation Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon, United States of America

  http://orcid.org/0000-0002-6875-092X

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• Jeffrey R. Adrion,

  Roles Formal analysis, Methodology, Writing – original draft, Writing – review & editing

  Affiliation Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon, United States of America

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• Leslie Ries,

  Roles Conceptualization, Data curation, Methodology, Writing – review & editing

  Affiliation Department of Biology, Georgetown University, Washington, D.C., United States of America

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• Jerome Wiedmann,

  Roles Data curation, Project administration, Writing – review & editing

  Affiliation The Ohio Lepidopterists, Columbus, Ohio, United States of America

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• Nick M. Haddad

  Roles Conceptualization, Methodology, Writing – original draft, Writing – review & editing

  Affiliation Department of Integrative Biology and W.K. Kellogg Biological Station, Michigan State University, Hickory Corners, Michigan, United States of America

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