title: Low-frequency vocalizations of sei whales (Balaenoptera borealis) in the Southern Ocean.
abstract: Simultaneous sightings and acoustic detections of sei whales (Balaenoptera borealis) are scarce, and there are few published data describing their vocalizations. Analysis of recordings from directional frequency analysis and recording sonobuoys in the presence of sei whales in the Southern Ocean in March 2013 identified both downsweep and upsweep calls. Sound frequencies within all calls were between 34 and 87 Hz with an average call duration of 1.1 s. These very low-frequency sounds share characteristics with sei whale calls recorded near the Hawaiian Islands and off Cape Cod in winter and summer, respectively, but are the first documented sei whale calls in the Southern Ocean that are clearly less than 100 Hz.
authors.affiliation: Australian Marine Mammal Centre, Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia susannah.calderan@scoter.org, brian.miller@aad.gov.au, kymcollins77@gmail.com, paulensor@xtra.co.nz, mike.double@aad.gov.au.
authors.forename: Susannah
authors.initials: S
authors.lastname: Calderan
authors.affiliation: Australian Marine Mammal Centre, Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia susannah.calderan@scoter.org, brian.miller@aad.gov.au, kymcollins77@gmail.com, paulensor@xtra.co.nz, mike.double@aad.gov.au.
authors.forename: Brian
authors.initials: B
authors.lastname: Miller
authors.affiliation: Australian Marine Mammal Centre, Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia susannah.calderan@scoter.org, brian.miller@aad.gov.au, kymcollins77@gmail.com, paulensor@xtra.co.nz, mike.double@aad.gov.au.
authors.forename: Kym
authors.initials: K
authors.lastname: Collins
authors.affiliation: Australian Marine Mammal Centre, Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia susannah.calderan@scoter.org, brian.miller@aad.gov.au, kymcollins77@gmail.com, paulensor@xtra.co.nz, mike.double@aad.gov.au.
authors.forename: Paul
authors.initials: P
authors.lastname: Ensor
authors.affiliation: Australian Marine Mammal Centre, Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia susannah.calderan@scoter.org, brian.miller@aad.gov.au, kymcollins77@gmail.com, paulensor@xtra.co.nz, mike.double@aad.gov.au.
authors.forename: Michael
authors.initials: M
authors.lastname: Double
authors.affiliation: School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, United Kingdom r.c.leaper@abdn.ac.uk.
authors.forename: Russell
authors.initials: R
authors.lastname: Leaper
authors.affiliation: Southwest Fisheries Science Center, National Marine Fisheries Service/National Oceanic and Atmospheric Administration, 8901 La Jolla Shores Drive, La Jolla, California 92037 jay.barlow@noaa.gov.
authors.forename: Jay
authors.initials: J
authors.lastname: Barlow
mesh_terms: D000818:Animals; D050616:Balaenoptera / Q000502:physiology*; D009792:Oceans and Seas; D013018:Sound Spectrography; D014828:Vocalization, Animal / Q000502:physiology*