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Additional Information

Competing Interests

Mark A. Hixon is an Academic Editor for PeerJ.

Author Contributions

Kurt E. Ingeman analyzed the data, wrote the paper, reviewed drafts of the paper.

Mark A. Albins analyzed the data, wrote the paper, reviewed drafts of the paper.

Cassandra E. Benkwitt analyzed the data, wrote the paper, reviewed drafts of the paper.

Stephanie J. Green analyzed the data, wrote the paper, reviewed drafts of the paper.

Tye L. Kindinger analyzed the data, wrote the paper, reviewed drafts of the paper.

Lillian J. Tuttle analyzed the data, wrote the paper, reviewed drafts of the paper.

Mark A. Hixon analyzed the data, wrote the paper, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:

The research in this article did not generate any data or code.

Funding

This research was funded by the US National Science Foundation Grants, OCE 08-51162 and 12-33027 awarded to M.A. Hixon. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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