title: Whistle source levels of free-ranging bottlenose dolphins and Atlantic spotted dolphins in the Gulf of Mexico.
abstract: Whistles of bottlenose dolphins (Tursiops truncatus) and Atlantic spotted dolphins (Stenella frontalis) in the eastern Gulf of Mexico were recorded and measured with a calibrated towed hydrophone array. Surveys encountered groups of both bottlenose (N = 10) and spotted dolphins (N = 5). Analysis of those data produced 1695 bottlenose dolphin whistles and 1273 spotted dolphin whistles with a high signal-to-noise ratio. Whistle frequency metrics were lower in bottlenose than spotted dolphins, while whistle duration was longer in spotted dolphins, data that may help inform automatic classification algorithms. Source levels were estimated by determining the range and bearing of an individual dolphin from the array and then adding the predicted transmission loss to the calculated received level. The median bottlenose dolphin source level was 138 dB re 1μPa at 1 m with a range of 114-163 dB re 1μPa at 1 m. The median spotted dolphin source level was 138 dB re 1μPa at 1 m with a range of 115-163 dB re 1μPa at 1 m. These source level measurements, in conjunction with estimates of vocalization rates and transmission loss models, can be used to improve passive acoustically determined dolphin abundance estimates in the Gulf of Mexico.
authors.affiliation: Marine Acoustics, Inc., 4100 North Fairfax Drive, Suite 730, Arlington, Virginia 22203.
authors.forename: Adam S
authors.initials: AS
authors.lastname: Frankel
authors.affiliation: Marine Acoustics, Inc., 4100 North Fairfax Drive, Suite 730, Arlington, Virginia 22203.
authors.forename: David
authors.initials: D
authors.lastname: Zeddies
authors.affiliation: University of South Florida, College of Marine Science, 140 7th Avenue South, St. Petersburg, Florida 33701.
authors.forename: Peter
authors.initials: P
authors.lastname: Simard
authors.affiliation: University of South Florida, College of Marine Science, 140 7th Avenue South, St. Petersburg, Florida 33701.
authors.forename: David
authors.initials: D
authors.lastname: Mann
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D000465:Algorithms; D000818:Animals; D050681:Bottle-Nosed Dolphin / Q000145:classification / Q000502:physiology* / Q000523:psychology; D004784:Environmental Monitoring / Q000379:methods; D060851:Gulf of America; D009792:Oceans and Seas; D010363:Pattern Recognition, Automated; D011156:Population Density; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D050706:Stenella / Q000145:classification / Q000502:physiology* / Q000523:psychology; D013550:Swimming; D014159:Transducers; D014828:Vocalization, Animal / Q000145:classification