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Supplemental Information

Suppent the raw data materials

Means of variables measured in this study for the fifteen sites.

DOI: 10.7287/peerj.preprints.2472v1/supp-1

Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Shaowei Li performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Jianshuang Wu conceived and designed the experiments, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:

The raw data has been supplied as a supplemental file.


This research was primarily supported by the Chinese Academy of Sciences (XDB03030401) and the National Natural Sciences Foundation of China (41401070), and partly supported the international postdoctoral exchange fellowship program to Jianshuang Wu from the Office of China Postdoctoral Council (No.20140041). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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