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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Grigory Potapov 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.

Yulia Kolosova 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.

Ivan Bolotov conceived and designed the experiments, performed the experiments, analyzed the data, 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):

Sampling on the Russian Federation territory (Solovetsky Archipelago) was permitted within the framework of the special grants of the Russian Foundation for Basic Research (RFBR, no. 16-05-00854), the Ministry of Science and Education of Russia (no. 6.2343.2017), and the President of Russia Grant Council (no. MD-7660.2016.5). Additionally, sampling on the Solovetsky Archipelago was permitted by the Directorate of the Federal State Cultural Institution “Solovetsky State Historical and Architectural Museum-Reserve” (scientific agreement no. 111-p). Sampling from the European counties was permitted by scientific agreement of 01.01.2011 between the Institute of Ecological Problems of the North of the Ural Branch of Russian Academy of Sciences and the Institute of Hydrology of the Slovak Academy of Science.

Data Deposition

The following information was supplied regarding data availability:

The raw data/code is included in the manuscript (Table 1).

Funding

This study was supported by the Ministry of Education and Science of the Russian Federation (project no. 6.2343.2017), the President of Russia Grant Council (project no. MD-7660.2016.5), and the Russian Foundation for Basic Research, RFBR (project no. 16-05-00854). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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