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Supplemental Information

Supplemental_Code_and_Data_S2

DOI: 10.7287/peerj.preprints.1880v1/supp-2

Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Luis M. Carrascal conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, organize, design, analyze and develop the Winter Spanish Bird Atlas.

Sara Villén-Pérez conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

David Palomino contributed reagents/materials/analysis tools, prepared figures and/or tables, organize, design, analyze and develop the Winter Spanish Bird Atlas.

Data Deposition

The following information was supplied regarding data availability:

The raw data has been supplied as a Supplemental Dataset

Funding

This paper is a contribution to projects CGL2008-02211/BOS and CGL2011-28177/BOS of the Spanish Ministry of Education and Science. During the development of this work, Sara Villén-Pérez was supported by a ‘Formacion de Personal Investigador’ predoctoral fellowship (BES-2009-029386) of the Spanish Ministry of Education and Science and by a ‘Young Talent Attraction’ fellowship (300274/2015-7) of the Nacional Council of Scientific and Technological Development of Brazil. David Palomino was contracted by SEO / BirdLife to organize, design, analyze and develop the Winter Spanish Bird Atlas. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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