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Supplemental Information

Detailed method and site descriptions

Detailed description of methods applied at each study site.

DOI: 10.7287/peerj.preprints.27530v1/supp-1

Additional Information

Competing Interests

Silviu O Petrovan is non-paid trustee (board of directors) of Froglife, a charity (non-profit) NGO.

Author Contributions

Jan Olof Helldin conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, prepared figures and/or tables, authored or reviewed drafts of the paper, approved the final draft.

Silviu O Petrovan analyzed the data, contributed reagents/materials/analysis tools, authored or reviewed drafts of the paper, approved the final draft.

Data Deposition

The following information was supplied regarding data availability:

Raw data are presented in technical reports according to URLs provided in the Main article and the Supplementary article 1.

Funding

The analysis and writing of this article was conducted within research funding from the Swedish Transport Administration (project TRIEKOL, TRV2016/50073). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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