DECAF - AUTEC Sperm Whales - Multiple Sensors - Samples
Density Estimation of Cetaceans from passive Acoustic Fixed sensors (DECAF)

N/A

This archive contains data on sperm whales (Physeter macrocephalus) recorded at the Atlantic Undersea Test and Evaluation Center (AUTEC) in the Tongue of the Ocean, Bahamas in August-September 2007. Data are provided showing when sperm whales were detected on the range during the time period, details about the availability of the acoustic data used in the analysis and finally, the number and size of sperm whale groups localized. Records in this dataset represent a sample of data used in the sperm whale group localizations. Fifty 10-minute periods were randomly subsampled from the available acoustic files, and clicking animals were localized, where possible. By chance, some 10-minute periods did not contain any sperm whale clicks.

This dataset used multiple hydrophones at AUTEC to detect sperm whale clicks. Click trains from individual whales were identified, enabling the number of diving whales to be estimated. Assuming that all diving sperm whale groups at a given time are detected by AUTEC, then density of diving sperm whales can be estimated.

Records in this dataset represent the sample of data used in the sperm whale group localizations. Each record represents the detection of a whale on a given hydrophone. A single whale may be heard on multiple hydrophones, as indicated in series.
The related dataset describing when sperm whales were detected on the range is available at http://seamap.env.duke.edu/dataset/682.
Original data can be downloaded at http://www.creem.st-and.ac.uk/decaf/decaf-data-files under Case Study 2: Sperm whale data
Time zone is GMT.
Hydrophone locations are approximate.

Jessica A. Ward, Len Thomas, Susan Jarvis, Nancy DiMarzio, David Moretti, Tiago A. Marques, Charlotte Dunn, Diane Claridge, Eva Hartvig and Peter Tyack. in press. Passive Acoustic Density Estimation of Sperm Whales in the Tongue of the Ocean, Bahamas. Marine Mammal Science

Overview

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 noteded 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
oid	OBIS-SEAMAP ID
station_id
series
sp_tsn	ITIS species tsn code
sp_obs	Species ID
calldatetime
obs_date	Date
obs_time	Time (GMT)
latitude	Instrument Latitude
longitude	Instrument Longitude
depth	Instrument Depth
obs_count	Number of animals
datarowid
set	Identifiers of particular recording periods
song	Identifiers of particular recording periods
segment	Identifiers of particular recording periods
secondsin
start_date	Sample start date
start_day_time
mmammal_sw_hyds
hyds_processed	The numbers of the hydrophones which were available to be processed for a given song.
on_1_off_0_range
number_of_whales_present_based_on_chain_evaluation	number of whales based on the number of click trains detected
hyds_evaluated_with_run_sep__nchains_
no_whales_localized_group_1_	Number of whales localized
no_whales_localized_group_2_	Number of whales localized in second group if there was a second group present at the same time