Differential changes in the onset of spring across US National Wildlife Refuges and North American migratory bird flyways

• Eric K. Waller ,

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

  * E-mail: ewaller@usgs.gov

  Affiliation U.S. Geological Survey, Western Geographic Science Center, Menlo Park, California, United States of America

  http://orcid.org/0000-0002-9169-9210

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• Theresa M. Crimmins,

  Roles Conceptualization, Project administration, Writing – original draft, Writing – review & editing

  Affiliations National Coordinating Office, USA National Phenology Network, Tucson, Arizona, United States of America, School of Natural Resources and the Environment, University of Arizona, Tucson, Arizona, United States of America

  http://orcid.org/0000-0001-9592-625X

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• Jessica J. Walker,

  Roles Conceptualization, Formal analysis, Project administration, Visualization, Writing – review & editing

  Affiliation U.S. Geological Survey, Western Geographic Science Center, Tucson, Arizona, United States of America

  http://orcid.org/0000-0002-3225-0317

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• Erin E. Posthumus,

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

  Affiliations National Coordinating Office, USA National Phenology Network, Tucson, Arizona, United States of America, School of Natural Resources and the Environment, University of Arizona, Tucson, Arizona, United States of America

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• Jake F. Weltzin

  Roles Conceptualization, Funding acquisition, Methodology, Project administration, Supervision, Writing – review & editing

  Affiliations National Coordinating Office, USA National Phenology Network, Tucson, Arizona, United States of America, U.S. Geological Survey, Tucson, Arizona, United States of America

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