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Comparing Distribution of Harbour Porpoises (Phocoena phocoena) Derived from Satellite Telemetry and Passive Acoustic Monitoring.
Aarhus University, Denmark.
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2016 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, no 7Article in journal (Refereed) Published
Abstract [en]

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 compare two 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 expressed as 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 study shows that two very different methods provide comparable information on relative distribution patterns of harbour porpoises even in a low density area.

Place, publisher, year, edition, pages
2016. Vol. 11, no 7
National Category
Ecology
Research subject
Man and the environment
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URN: urn:nbn:se:nrm:diva-2134DOI: 10.1371/journal.pone.0158788PubMedID: 27463509OAI: oai:DiVA.org:nrm-2134DiVA: diva2:1060523
Available from: 2016-12-28 Created: 2016-12-28 Last updated: 2016-12-29Bibliographically approved

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Carlström, Julia A K

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