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Supplemental Information

Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Valentina Cusseddu conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Giulia Ceccherelli conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Mark Bertness conceived and designed the experiments, performed the experiments, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Field Study Permissions

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

Town of Badesi approval number: 3343 (23/03/2012)

Data Deposition

The following information was supplied regarding data availability:

The raw data has been supplied as a Supplemental Dataset.

Funding

The Italian Ministry of Education and Research (MIUR), PRIN 2012-2015 (TETRIS), University of Sassari (Ateneo's PhD and Ulisse Fellowship), the Robert P. Brown Chair in Biology, Brown University, and a Fulbright Fellowship supported this work. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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