title: Source levels of clicks from free-ranging white-beaked dolphins (Lagenorhynchus albirostris Gray 1846) recorded in Icelandic waters.
abstract: This study reports the source levels of clicks recorded from free-ranging white-beaked dolphins (Lagenorhynchus albirostris Gray 1846). A four-hydrophone array was used to obtain sound recordings. The hydrophone signals were digitized on-line and stored in a portable computer. An underwater video camera was used to visualize dolphins to help identify on-axis recordings. The range to a dolphin was calculated from differences in arrival times of clicks at the four hydrophones, allowing for calculations of source levels. Source levels in a single click train varied from 194 to 211 dB peak-to-peak (p-p) re: 1 microPa. The source levels varied linearly with the log of range. The maximum source levels recorded were 219 dB (p-p) re: 1 microPa.
authors.affiliation: Center for Sound Communication, Institute of Biology, Odense University, Denmark.
authors.forename: Marianne H
authors.initials: MH
authors.lastname: Rasmussen
authors.forename: Lee A
authors.initials: LA
authors.lastname: Miller
authors.forename: Whitlow W L
authors.initials: WW
authors.lastname: Au
mesh_terms: D000818:Animals; D004289:Dolphins; D007055:Iceland; D014828:Vocalization, Animal