The Geographic Distribution of a Tropical Montane Bird Is Limited by a Tree: Acorn Woodpeckers (Melanerpes formicivorus) and Colombian Oaks (Quercus humboldtii) in the Northern Andes

• Benjamin G. Freeman ,

  Contributed equally to this work with: Benjamin G. Freeman, Nicholas A. Mason

  * E-mail: bgf27@cornell.edu

  Affiliations Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, United States of America, Cornell Lab of Ornithology, Ithaca, New York, United States of America

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• Nicholas A. Mason

  Contributed equally to this work with: Benjamin G. Freeman, Nicholas A. Mason

  Affiliations Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, United States of America, Cornell Lab of Ornithology, Ithaca, New York, United States of America

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