4. Temperature-Depth-Recorder (TDR) FastLog Data of Seabirds Breeding in the Main Hawaiian Islands
Dates
Publication Date
2019-12-31
Start Date
2014-05-13
End Date
2015-09-30
Acquisition
2020-05-29
Citation
Felis, J.J., Czapanskiy, M.F., and Adams, J., 2020, At-sea ranging behavior of seabirds breeding in the main Hawaiian Islands: Bio-logger data release (ver. 2.0, May 2020): U.S. Geological Survey data release, https://doi.org/10.5066/P9NTEXM6.
Summary
We deployed miniature Temperature-Depth Recorders (TDRs; Cefas G5, 3 g, Cefas Technology Ltd., Lowestoft, UK) to measure dive depths and wet/dry condition (depending on TDR model year). TDRs have a saltwater switch that, when immersed, initiates a FastLog mode to record pressure and temperature at high resolution. The FastLog mode can be programmed to record only if the pressure is greater than a user-defined threshold (e.g. dive depth). In addition, some units have a wet/dry setting to record the start and end times of wet periods (bouts of time on the water, regardless of dive behavior). CEFAS G5 TDRs are an archival unit, requiring recapture of the tagged bird to recover the tag and download data. TDRs were deployed on a subset [...]
Summary
We deployed miniature Temperature-Depth Recorders (TDRs; Cefas G5, 3 g, Cefas Technology Ltd., Lowestoft, UK) to measure dive depths and wet/dry condition (depending on TDR model year). TDRs have a saltwater switch that, when immersed, initiates a FastLog mode to record pressure and temperature at high resolution. The FastLog mode can be programmed to record only if the pressure is greater than a user-defined threshold (e.g. dive depth). In addition, some units have a wet/dry setting to record the start and end times of wet periods (bouts of time on the water, regardless of dive behavior). CEFAS G5 TDRs are an archival unit, requiring recapture of the tagged bird to recover the tag and download data.
TDRs were deployed on a subset of GPS-tagged birds (Red-tailed Tropicbirds [Phaethon rubricauda], Brown Boobies [Sula leucogaster], Red-footed Boobies [Sula sula]) or on additional non-GPS-tagged birds (Wedge-tailed Shearwaters [Ardenna pacifica]). TDRs were taped to the metal leg band with the pressure transducer and saltwater switch oriented towards the bird’s body to avoid potential sensor damage from the bird walking on the ground. TDRs were programmed to record depth (12 bit resolution, ±1 m) at a background rate of 1 min (EventID 0) and at 10 hz when wet and, for some tags, below a pre-set threshold pressure equivalent to 1 m depth (EventID >0). Deployment-specific tag settings are documented in the Deployments table.
The text file output from CEFAS devices contains metadata and up to three types of data (background sampling, FastLog sampling, and wet/dry periods). We extracted the background samples (EventID 0) and FastLog samples (EventID > 0), clipped them to within tag deployment/recovery time window, and concatenated them in row-column format using a custom R script. FastLog information can be used to identify unique dives through more detailed analysis. Tag data can be joined to additional deployment/ancillary information in the Deployments table by DeployID. Data are provided in species-specific comma-separated-value (CSV) files. Note that files are very large and should be utilized with appropriate programming software (R, Matlab, etc).
Click on title to download individual files attached to this item.
BRBO_tdr_FastLog.zip
4.84 MB
application/zip
RFBO_tdr_FastLog.zip
72.5 MB
application/zip
RTTR_tdr_FastLog.zip
13.41 MB
application/zip
WTSH_tdr_FastLog.zip
1.72 MB
application/zip
Purpose
GPS tracking data of seabirds breeding in the main Hawaiian Islands were collected for the Bureau of Ocean Energy Management to understand the at-sea distribution and ranging behaviors of seabirds and to inform marine spatial planning for potential offshore wind energy development.