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Supplemental Information

Power spectral density of ambient noise in Beibu Gulf at sea state of zero and hydrophone self-noise

The nominal self-noise level was obtained when the hydrophone was connected to the voltage pre-amplifier VP2000 and was provided courtesy of the Reson company. The gray lines were the 95% confidence interval of the ambient noise.

DOI: 10.7287/peerj.preprints.1684v1/supp-1

Beam pattern of circular piston transducer

Modeling was based by using a radius of 4 cm (directivity index =3 dB) and 6 cm (directivity index =6 dB) piston transducer at typical Sousa whistle frequency of 6.35 kHz.

DOI: 10.7287/peerj.preprints.1684v1/supp-3

Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Zhi-Tao Wang 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.

Whitlow Au contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Luke Rendell contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Ke-Xiong Wang conceived and designed the experiments, performed the experiments, wrote the paper, reviewed drafts of the paper.

Hai-Ping Wu wrote the paper, reviewed drafts of the paper.

Yu-Ping Wu wrote the paper, reviewed drafts of the paper.

Jian-Chang Liu wrote the paper, reviewed drafts of the paper.

Guo-Qin Duan wrote the paper, reviewed drafts of the paper.

Han-Jiang Cao wrote the paper, reviewed drafts of the paper.

Ding Wang conceived and designed the experiments, performed the experiments, 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):

Permission to conduct the study was granted by the Ministry of Science and Technology of the People’s Republic of China. The research permit was issued to the Institute of Hydrobiology of the Chinese Academy of Sciences (Permit number: 2011BAG07B05).

Data Deposition

The following information was supplied regarding data availability:

The raw data is too large to be made available online.

Funding

Grants for this study was provided by the National Natural Science Foundation (NNSF) of China (Grant No.31070347), the Ministry of Science and Technology of China (Grant No. 2011BAG07B05-3), the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No.KSCX2-EW-Z-4) and the Special Fund for Agro-scientific Research in the Public Interest of the Ministry of Agriculture of China (Grant No.201203086) to DW, the State Oceanic Administration of China (Grant No.201105011-3) and NNSF of China (Grant No.31170501) to KXW and the China Scholarship Council (Grant No.[2014]3026) to ZTW. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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