Dear all, On behalf of my co-authors, I am pleased to announce the publication of the following article:
Puk Faxe Sabinsky; Ole Næsbye Larsen; Magnus Wahlberg and Jakob Tougaard (2017) "*Temporal and spatial variation in harbor seal (Phoca vitulina L.) roar calls from southern Scandinavia*". The Journal of the Acoustical Society of America (Vol.141, No.3, p.824–1834). URL: http://asa.scitation.org/doi/10.1121/1.4977999 DOI: 10.1121/1.4977999 *Abstract:* Male harbor seals gather around breeding sites for competitive mating displays. Here, they produce underwater vocalizations possibly to attract females and/or scare off other males. These calls offer prospects for passive acoustic monitoring. Acoustic monitoring requires a good understanding of natural variation in calling behavior both temporally and among geographically separate sites. Such variation in call structure and calling patterns were studied in harbor seal vocalizations recorded at three locations in Danish and Swedish waters. There was a strong seasonality in the calls from end of June to early August. Vocalizations at two locations followed a diel pattern, with an activity peak at night. Recordings from one location also showed a peak in call rate at high tide. Large geographic variations were obvious in the total duration of the so-called roar call, the duration of the most prominent part of the call (the roar burst), and of percentage of energy in roar burst. A similarly large variation was also found when comparing the recordings from two consecutive years at the same site. Thus, great care must be taken to separate variation attributable to recording conditions from genuine biological differences when comparing harbor seal roars among recording sites and between years. A PDF version of the paper can be provided by request. Best wishes on behalf of the authors, Puk Faxe Sabinsky, M.Sc. pukfa...@gmail.com
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