Raw files from passive hydrophone from Harris Creek, Chesapeake Bay, MD from 2015 (Larval settlement soundscapes project)

Website: https://www.bco-dmo.org/dataset/707721
Data Type: Other Field Results
Version: 1
Version Date: 2017-07-05

» Can you hear me now? Estuarine soundscapes and their role in larval settlement (Larval settlement soundscapes)
Eggleston, David B.North Carolina State University (NCSU MEAS)Principal Investigator
Bohnenstiehl, DelWayneNorth Carolina State University (NCSU MEAS)Co-Principal Investigator
Kellogg, M. LisaVirginia Institute of Marine Science (VIMS)Co-Principal Investigator
Lyon, R. P.North Carolina State University (NCSU MEAS)Student
Ricci, ShannonNorth Carolina State University (NCSU)Technician
Copley, NancyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

This dataset contains passive acoustic recordings from sites within a mid-latitude Oyster Reef Restoration Site in Harris Creek, a tributary of the Chesapeake Bay, MD. Each file contains raw acoustic records collected using a SoundTrap hydrophone recorder (OceanInstruments New Zealand) deployed within the boundaries of a reef assessment site during May 2015. The hydrophone was configured to record 2 minutes of data every 30 minutes at Little Neck, Walnut, and Lodges, and 2 minutes every 15 minutes at Rabbit Island East, Seth’s Point, Mill Point, Eagle Point, and Change. The sample rate for each deployment was 96,000 Hz.


Spatial Extent: N:38.7718 E:-76.28797 S:38.7208 W:-76.31173
Temporal Extent: 2015-05-06 - 2015-06-01

Acquisition Description

Beginning in May 2015, a short-term effort was initiated to record ambient underwater sound at high temporal resolution, at restored and unrestored oyster reefs within a large-scale oyster restoration site in Harris Creek, MD. This was accomplished using a low-power SoundTrap recorder and hydrophone (Ocean Instruments New Zealand).

The instrument was strapped vertically to a metal post and positioned ~0.15m above the seafloor and approximately 1.0-3.5 m below mean lower low water (MLLW) at all sites.

Recordings began 5/6/2015 at 12:00 and ended 6/1/2015 at 10:00. The instrument was programmed to record for 130 seconds every 15 or 30 minutes at a 96 kHz sample rate. The SoundTrap analog signal is digitized at a fixed rate of 288 kHz. A digital anti-alias filter, with a cutoff frequency of 0.45 times the desired sample rate, is then applied before decimation. Consequently, at our sample rate of 96 kHz, the useable (-3 dB) bandwidth of these recordings is 0.020-43.0 kHz. In total, 16,185 separate 2-minute recordings were made as part of this monitoring initiative.

The data may be read into MATLAB using functions included in MATLAB.

% Set calibration

[y,fs]=audioread(‘filename.wav’); %read in audiofile
y=y(fs*5:end) %remove first 5 seconds that have calibration sound
y=(y-mean(y))*cal; %demeaned and response correct to uPa

Processing Description

These are raw .wav acoustic files.

BCO-DMO Processing:
- added conventional header with dataset name, PI name, version date
- created a flat file with submitted metadata including lat and lon, date/time, recording parameters, and links to download the data files.
- converted datetimes to ISO_TimeDate_Local_start and _end

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Related Publications

Ricci, S. W., Eggleston, D. B., & Bohnenstiehl, D. R. (2017). Use of passive acoustic monitoring to characterize fish spawning behavior and habitat use within a complex mosaic of estuarine habitats. Bulletin of Marine Science, 93(2), 439-453. https://doi.org/10.5343/bms.2016.1037
Ricci, S., Eggleston, D., Bohnenstiehl, D., & Lillis, A. (2016). Temporal soundscape patterns and processes in an estuarine reserve. Marine Ecology Progress Series, 550, 25–38. doi:10.3354/meps11724

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siterecording site unitless
latlatitude; north is positive decimal degrees
lonlongitude; east is positive decimal degrees
deploymentdeployment identification unitless
ISO_DateTime_Local_startstart date and time; ISO 8601:2004(E) format: YYYY-MM-DDTHH:MM:SS year-month-day-hour-minute-second
ISO_DateTime_Local_endend date and time; ISO 8601:2004(E) format: YYYY-MM-DDTHH:MM:SS year-month-day-hour-minute-second
SoundTrap_numidentification number of recorder unitless
calibrationhydrophone calibration: sound pressure level in water decibel microPascals per count (dB uPa/count)
first_filefirst sound file in series at a particular site and deployment unitless
last_filelast sound file in series at a particular site and deployment unitless
file_size_GBsize of zipped sound file Gigabytes
file_linklink to download .zip sound file unitless

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Dataset-specific Instrument Name
Ocean Instruments New Zealand
Generic Instrument Name
Generic Instrument Description
A hydrophone is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates electricity when subjected to a pressure change.

Dataset-specific Instrument Name
SoundTrap recorder and hydrophone (Ocean Instruments New Zealand)
Generic Instrument Name
Acoustic Recorder
Generic Instrument Description
An acoustic recorder senses and records acoustic signals from the environment.

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small boat - NCSU
Start Date
End Date
Ambient underwater sound recordings

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Project Information

Can you hear me now? Estuarine soundscapes and their role in larval settlement (Larval settlement soundscapes)

Coverage: Pamlico Sound, North Carolina

The overall goal of this study is to advance our general understanding of the role of underwater sound in biological oceanography by characterizing spatiotemporal variation in an estuarine soundscape, and determine if this variation affects the settlement of larval invertebrates. The investigators will use larval bivalves and subtidal oyster reefs in Pamlico Sound, North Carolina as a study system. A combination of field and laboratory experiments will be used to test the effects of sound on larval behaviors and settlement. The underwater sonic environment has the potential to provide meaningful sensory information to all aquatic animals. Acoustic signals are transmitted relatively large distances, are present at all depths, and reflect biological and physical characteristics of the environment, while other cues (e.g. light, chemicals) are rapidly attenuated from the source. Sound is well established as an orientation and habitat selection cue for marine mammals and fishes, and has recently emerged as a potentially important contributor to larval settlement. Building capacity (knowledge, expertise, equipment) for integrating geophysical aspects of underwater sound propagation with ecological and oceanographic processes is central to bio-physical studies of larval connectivity and recruitment in marine systems. It also informs our understanding of the potential adverse effects of noise pollution in the ocean and may elucidate untested benefits of marine reserves - ultimately leading to healthier and better managed oceans and estuaries. The project supports graduate, postdoctoral and undergraduate student training, as well as educational outreach programs that span local, regional and national levels

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Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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