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Ulrika Roos Master thesis presentation 1 june 2007

Evaluation of a new device for static acoustic monitoring of harbour porpoises in the wild. Ulrika Roos Master thesis presentation 1 june 2007 International Master programme in Applied Biology Linköping University. Background. Harbour porpoises seriously threatened in the Baltic Sea

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Ulrika Roos Master thesis presentation 1 june 2007

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  1. Evaluation of a new device for static acoustic monitoring of harbour porpoises in the wild Ulrika Roos Master thesis presentation 1 june 2007 International Master programme in Applied Biology Linköping University

  2. Background Harbour porpoises seriously threatened in the Baltic Sea Swedish board of fisheries; The porpoise project The PCL: Porpoise Click Logger SAM: Static Acoustic Monitoring PCL Harbour porpoise Phocoena phocoena

  3. Aim To evaluate the function of the PCL - Detection function - Practical and technical properties

  4. Methods Calibrations Validation study Pilot project

  5. Methods Validation study In Denmark Tracking with theodolite PCLs deployed in cluster PCL cluster Observation station

  6. Methods Validation study Track from travelling porpoise Red – Detected by all PCLs Yellow – Detected by some PCLs Screendump from Aquaclick View, displaying a porpoise click train

  7. Results Low and varying hydrophone sensitivities Varying detection ranges between units Mean first porpoise detection distances for the PCLs and the maximum and minimum values (n=12).

  8. Results Theoretical detection range - 157 m Farthest detected porpoise - 155 m Detection proportion 12/13 porpoises Practicality given a 4.4 (scale 1-5, n=7) by the fishermen

  9. Conclusions • Comparable to earlier similar devices • Well suited for use in fishery • Low and varying hydrophone sensitivities a problem • Important knowledge for further use of the PCL

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