Bryde's whale localized acoustic detections off Kauai 2013-2022

Regina A. Guazzo, Naval Information Warfare Center Pacific

Dataset credit

Naval Information Warfare Center Pacific


Primary contact Regina Guazzo Naval Information Warfare Center Pacific
Data entry Ei Fujioka Duke University



A unique acoustic call was identified and attributed to the Bryde’s whale in
the central North Pacific in 2015, but little is known about the distribution,
calling behavior, or swimming behavior of Bryde’s whales in the region.
Acoustic detections attributed to Bryde’s whales were used to localize and
track individual whales on the U.S. Pacific Missile Range Facility (PMRF) in
Kaua‘i, Hawai‘i. This study included 150 acoustically derived tracks from
recordings spanning the years 2011–2022 with recording effort in nearly
every month. Bryde’s whale movement was examined relative to calendar
year, day of year, hour of day, wind speed, and acoustic calling rate. Hidden
Markov models were used to identify two kinematic states (slower, less
directional movement and faster, more directional movement). The
findings indicate that Bryde’s whales were more likely to travel in a faster
and more directional state during the daytime than at night and between
May and August when compared to other times of year. The along-track
acoustic cue rate was examined for 118 tracks, and the findings indicate a
possible lengthening of the median inter-call interval over the duration of
the study period. These results are an important first step in understanding
more about behavior in Bryde’s whales, a relatively understudied species.



Supplemental information

47 stationary hydrophones were used to detect. The monitoring effort for the
47 hydrophones were same. The locations of the hydrophones are rounded
and approximate.




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 described below represent those in the original dataset provided by the provider.
All attributes are included in the downloadable file (CSV or ESRI File Geodatabase) for "Complete Set of Dataset".

Attributes in dataset

Attribute (table column)Description
oidUnique ID number (generated by OBIS-SEAMAP)
speciesSpecies name
sp_tsnTaxonomic Serial Number added by OBIS-SEAMAP
obs_countNumber of animals (always 1)
latitudeLatitude in decimal degrees
longitudeLongitude in decimal degrees
juliantimeofemissionDate/time of emission in Julian time, Matlab format UTC
datestringtimeofemissionString format of date/time of emission UTC
tracknumTrack number
datetimeofemissionDate/time of emission UTC
geomGeometry field added by OBIS-SEAMAP
Marine mammals5,974
Sea turtles0
Rays and sharks0
Other species0
Non spatial0
Non species0
Date, Begin2013-08-06
Date, End2022-06-07
Temporal prec.111111
Latitude22.28 - 22.80
Longitude-160.05 - -159.85
Coord. prec.6 decimal digits
Data typeAcoustic - presence
EffortYES (ID: 2285)
Traveled (km)0
Travel hours1,652,884
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