DECAF - AUTEC Beaked whales - Multiple Sensors - Click counts
Density Estimation of Cetaceans from passive Acoustic Fixed sensors (DECAF)

Dataset credit



Primary contact Jessica Ward Naval Undersea Warfare Center
Data entry Melissa Soldevilla Duke University



This archive contains data on echolocation clicks of Blainville's beaked whale (Mesoplodon densirostris) recorded at AUTEC during a 6-day period in spring 2005. The data were used in estimating M. densirostris density as documented in the paper Marques et al. (2009). There are data files containing click counts per minute per hydrophone, files containing numbers of false positive detections from a manual analysis, and files giving information about georeferenced tracks of tagged whales and associated vocalization timings.



Supplemental information

Each record (observation) represents number of clicks detected during one minute at one of 82 hydrophones. Species identification for automatic click detections is unknown and are assigned as Odontocete. Manually verified click detections have been assigned to appropriate family or genus by a trained acoustician for a sample of thirty 10-minute files. Manually-verified non-biological sources are recorded to species nan. Some automated detections may be from non-biological sources; False detection analysis suggest this will occur <3% of the time. The effect of occasional system tests and differences in frequency response of hydrophones on automated detection and classification has not been quantified.
Time zone is GMT.

Hydrophone locations are only approximate.

Related datasets from tagged beaked whales are available at and

Original data can be downloaded at under Case Study 3: Beaked whale data


Marques, T.A., L. Thomas, J. Ward, N. DiMarzio, P. L. Tyack. 2009. Estimating cetacean population density using fixed passive acoustic sensors: An example with Blainville’s beaked whales. Journal of the Acoustical Society of America. 125(4): 1982-1994.



Attributes described below represent those in the original dataset provided by the provider.
Only minimum required attributes are visible and downlodable online. Other attributes may be obtained upon provider's permission unless otherwise noted below.

This section explains attributes included in the original dataset. OBIS-SEAMAP restricts the attributes available to the public to date/time, lat/lon and species names/counts only. Should you need other attributes described here, you are encouraged to contact the data provider.

Attributes in dataset provided

Attribute (table column)Description
Marine mammals97,686
Sea turtles0
Rays and sharks0
Other species0
Non spatial0
Non species452
Date, Begin2005-04-26
Date, End2005-05-02
Temporal prec.111111
Latitude24.30 - 24.76
Longitude-77.64 - -77.39
Coord. prec.6 decimal digits
Data typeAcoustic - #call
EffortYES (ID: 678)
Sharing policy CC-BY (All)
Also availalbe from None
See metadata in static HTML
See metadata in FGDC XML
See download history / statistics