期刊
PLOS ONE
卷 11, 期 7, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0158788
关键词
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资金
- EU LIFE+ [LIFE08 NAT/S/000261]
- Swedish Agency for Marine and Water Management
- Finnish Ministry of Environment
- WWF Finland
- Turku University of Applied Sciences
- Tampereen Sarkanniemi Ltd.
- University of Gdansk
- Chief Inspectorate of Environmental Protection, Poland
- National Fund for Environmental Protection and Water
- Voivodship Fund for Environment Protection and Water
- Aarhus University
- Danish Nature Agency
- Federal Agency for Nature Conservation, Germany [SAMBAH II 5 Vw/52602/2011 - Mar 36032/66]
- European Association of Zoos and Aquaria
- Kolmarden Wildlife Park
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.
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