title: Similarities in echolocation strategy and click characteristics between a Pseudorca crassidens and a Tursiops truncatus.
abstract: A previous comparative analysis of normalized click amplitude spectra from a Tursiops truncatus has shown that those frequencies with the lowest click-to-click variability in spectral content were the frequencies the animal paid attention to during target discrimination tasks. In that case, the dolphin only paid attention to the frequency range between 29-42 kHz which had a significantly higher degree of consistency in spectral content than frequencies above 42 kHz. Here it is shown that despite their morphological and behavioral differences, this same pattern of consistency was used by a Pseudorca crassidens performing a similar discrimination task. This comparison between species provides a foundation for using spectral level variability to determine the frequencies most important for echolocation in rare species and non-captive animals. Such results provide key information for successful management.
authors.affiliation: University of California San Diego, Serf Building Room 295 0435, 9500 Gilman Drive, La Jolla, California 92093, USA. sibsen@ucsd.edu
authors.forename: Stuart D
authors.initials: SD
authors.lastname: Ibsen
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Krause-Nehring
authors.forename: Paul E
authors.initials: PE
authors.lastname: Nachtigall
authors.forename: Whitlow W L
authors.initials: WW
authors.lastname: Au
authors.forename: Marlee
authors.initials: M
authors.lastname: Breese
mesh_terms: D000818:Animals; D001288:Attention; D050681:Bottle-Nosed Dolphin / Q000502:physiology*; D004192:Discrimination, Psychological; D004289:Dolphins / Q000502:physiology*; D004455:Echolocation; D056727:Endangered Species; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D013997:Time Factors; D014828:Vocalization, Animal