Comparing Distribution of Harbour Porpoises (<i>Phocoena phocoena</i>) Derived from Satellite Telemetry and Passive Acoustic Monitoring. Mikkelsen, L. A. R., Frank F. AND Kyhn, L. A. A. S., Signe AND Dietz, R. A. T., Jakob AND Carlstrom, J. A. K. A. C., & Ida AND Koblitz, J. C. A. T. PLoS ONE, 11(7):e0158788, Public Library of Science, 07, 2016.
Comparing Distribution of Harbour Porpoises (<i>Phocoena phocoena</i>) Derived from Satellite Telemetry and Passive Acoustic Monitoring [link]Paper  doi  abstract   bibtex   

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.

@Article{Mikkelsen2016,
  author    = {Mikkelsen, Lonnie AND Rigét, Frank F. AND Kyhn, Line A. AND Sveegaard, Signe AND Dietz, Rune AND Tougaard, Jakob AND Carlstrom, Julia A. K. AND Carlén, Ida AND Koblitz, Jens C. AND Teilmann, Jonas},
  title     = {Comparing Distribution of Harbour Porpoises (\textit{Phocoena phocoena}) Derived from Satellite Telemetry and Passive Acoustic Monitoring},
  year      = {2016},
  volume    = {11},
  number    = {7},
  month     = {07},
  pages     = {e0158788},
  doi       = {10.1371/journal.pone.0158788},
  url       = {http://dx.doi.org/10.1371%2Fjournal.pone.0158788},
  abstract  = {<p>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 (<italic>Phocoena phocoena</italic>) 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.</p>},
  file      = {:journal.pone.0158788.PDF:PDF},
  journal   = {PLoS ONE},
  owner     = {Tiago Marques},
  publisher = {Public Library of Science},
  timestamp = {2016.08.03},
}
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