title: Shifts in frequency-modulated pulses recorded during an encounter with Blainville's beaked whales (Mesoplodon densirostris).
abstract: Echolocation signals produced by beaked whales (family: Ziphiidae) include frequency-modulated (FM) pulses that appear to have species-specific characteristics. To date there has been no established evidence that a single species of beaked whale might produce more than one type of FM pulse. In 2014 a group of Blainville's beaked whales (Mesoplodon densirostris) were sighted off of Southern California; recordings included FM pulses with significant increases in peak frequency, center frequency, and -10 dB bandwidth relative to FM pulses previously attributed to this species. This research suggests there may be greater variation in received beaked whale FM pulses than previously understood.
authors: Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, 8901 La Jolla Shores Drive, La Jolla, California 92037, USA jennifer.keating@noaa.gov, jay.barlow@noaa.gov, shannon.rankin@noaa.gov.
authors: Jennifer L
authors: JL
authors: Keating
authors: Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, 8901 La Jolla Shores Drive, La Jolla, California 92037, USA jennifer.keating@noaa.gov, jay.barlow@noaa.gov, shannon.rankin@noaa.gov.
authors: Jay
authors: J
authors: Barlow
authors: Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, 8901 La Jolla Shores Drive, La Jolla, California 92037, USA jennifer.keating@noaa.gov, jay.barlow@noaa.gov, shannon.rankin@noaa.gov.
authors: Shannon
authors: S
authors: Rankin
mesh_terms: D000818:Animals; D002140:California; D004455:Echolocation / Q000502:physiology*; D013018:Sound Spectrography / Q000379:methods*; D013045:Species Specificity; D014907:Whales / Q000502:physiology*