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Comparing distribution of harbour porpoises (Phocoena phocoena) derived from satellite telemetry and passive acoustic monitoring
Mikkelsen, L.; Riget, F.F.; Kyhn, L.A.; Sveegaard, S.; Dietz, R.; Tougaard, J.; Carlström, J.A.K.; Carlén, I.; Koblitz, J.C. (2016). Comparing distribution of harbour porpoises (Phocoena phocoena) derived from satellite telemetry and passive acoustic monitoring. PLoS One 11(7): e0158788. http://dx.doi.org/10.1371/journal.pone.0158788
In: PLoS One. Public Library of Science: San Francisco. ISSN 1932-6203; e-ISSN 1932-6203, more
Peer reviewed article  
Available in  Authors 
Keyword
    Marine/Coastal
Authors  Top 
  • Mikkelsen, L.
  • Riget, F.F., more
  • Kyhn, L.A.
  • Sveegaard, S.
  • Dietz, R., more
  • Tougaard, J.
  • Carlström, J.A.K.
  • Carlén, I.
  • Koblitz, J.C.
Abstract
    Cetacean monitoring is essential in determining the status of a population. Different monitoring methods should reflect the real trends in abundance and patterns in distribution, and results should therefore ideally be independent of the selected method. Here, we comparetwo independent methods of describing harbour porpoise (Phocoena phocoena) relative distribution pattern in the western Baltic Sea. Satellite locations from 13 tagged harbour porpoises were used to build a Maximum Entropy (MaxEnt) model of suitable habitats. The data set was subsampled to one location every second day, which were sufficient to make reliable models over the summer (Jun-Aug) and autumn (Sep-Nov) seasons. The modelled results were compared to harbour porpoise acoustic activity obtained from 36 static acoustic monitoring stations (C-PODs) covering the same area. The C-POD data was expressedas the percentage of porpoise positive days/hours (the number of days/hours per day with porpoise detections) by season. The MaxEnt model and C-POD data showed a significant linear relationship with a strong decline in porpoise occurrence from west to east. This studyshows that two very different methods provide comparable information on relative distribution patterns of harbour porpoises even in a low density area.
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