Baird's beaked whale echolocation signals

TitleBaird's beaked whale echolocation signals
Publication TypeJournal Article
Year of Publication2013
AuthorsBaumann-Pickering, Simone, Yack Tina M., Barlow Jay, Wiggins Sean M., and Hildebrand John A.
JournalThe Journal of the Acoustical Society of America
Volume133
Pagination4321-4331
EndNote Rec Number10228
Abstract

Echolocation signals from Baird's beaked whales were recorded during visual and acoustic shipboard surveys of cetaceans in the California Current ecosystem and with autonomous, long-term recorders in the Southern California Bight. The preliminary measurement of the visually validated Baird's beaked whale echolocation signals from towed array data were used as a basis for identifying Baird's signals in the autonomous recorder data. Two distinct signal types were found, one being a beaked whale-like frequency modulated (FM) pulse, the other being a dolphin-like broadband click. The median FM inter-pulse interval was 230ms. Both signal types showed a consistent multi-peak structure in their spectra with peaks at ∼9, 16, 25, and 4kHz. Depending on signal type, as well as recording aspect and distance to the hydrophone, these peaks varied in relative amplitude. The description of Baird's echolocation signals will allow for studies of their distribution and abundance using towed array data without associated visual sightings and from autonomous seafloor hydrophones.