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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

James J Roper conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

André M. X. Lima analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Angélica M. K. Uejima conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

All methods followed standards of ethics under Brazilian law.

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

ICMBio/CEMAVE provided license for banding birds.

Funding

James J. Roper is supported by a CNPq productivity fellowship (306963/2012-4). André M. X. Lima is supported by a doctoral fellowship CAPES/REUNI. Angélica M. K. Uejima was supported by a CNPq doctoral fellowship. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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