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HVALATAL „ACOUSTIC TECHNIQUES TO STUDY MARINE MAMMALS“

Research on marine mammals, including white-beaked dolphins and humpback whales, using acoustic techniques such as echolocation and automatic gain control. Investigating humpback whale songs in Icelandic waters and comparing them to other populations. Future plans include deploying Ecological Acoustic Recorders to study cetacean distribution in Skjálfandi Bay and recording Blue whale and killer whale sounds.

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HVALATAL „ACOUSTIC TECHNIQUES TO STUDY MARINE MAMMALS“

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  1. HVALATAL „ACOUSTIC TECHNIQUES TO STUDY MARINE MAMMALS“ Rannsókna- og fræðasetur Háskóla Íslands á Norðausturlandi, Húsavík Húsavík Research Center Marianne Helene Rasmussen

  2. Markmið - Aim • Rannsóknir á sjávarspendýrum • Research on marine mammals

  3. The past • Research on white-beaked dolphins • Humpback whales singing in Icelandic waters?

  4. White-beaked dolphins

  5. Echolocation

  6. Automatic gain control? Rasmussen et al., 2002

  7. A click sequence Click intervals (ms) Time (ms) Rasmussen and Miller, 2002

  8. Whistles Rasmussen and Miller, 2002 kHz 40 End frequency 20 Start frequency 5 1 2 duration seconds

  9. Directionality of the signals? • Narrow beam for echolocation • Broad beam for communication Rasmussen et al, 2006 Rasmussen et al., 2004

  10. High frequency on-axis click F0= 63 kHz, SL=163 dB F0= 56 kHz, SL=159 dB F0= 94 kHz SL=176 dB F0= 87 kHz, SL=173dB -60 dB -72 dB

  11. Audiogram of a dolphin?

  12. Audiogram of a dolphin? • We netted two dolphins in > 340 hrs on the water

  13. Audiogram of a dolphin?

  14. Audiogram of a dolphin?

  15. Audiogram of a dolphin? • Nachtigall et al., 2008

  16. Acoustic tagging and foraging 19 fouraging events

  17. Migration of a white-beaked dolphin • 8 August 2006 to 24 February 2007 (201 days) Aug Total distance traveled=5280 km (1090 km in August) Average speed=4 km/hr Spent 44% of time in Faxaflói Bay Dec 100 m depth contour Sept Breiðafjörður Oct Jan Faxaflói Aug, Oct to Feb Nov, Feb Vestmannaeyjar

  18. Release of dolphin

  19. Humpback whale song • The goal was to compare humpback whale song from the Northeast Atlantic population. Do they sing the same song in Icelandic waters as by the Cap Verde islands?

  20. song theme 1 phrase 1 phrase 1 units song theme 2 phrase 2

  21. Humpback whale song

  22. The future • Deploying Ecological Acoustic Recorders (EAR’s) in Skjálfandi Bay in Cooperation with Dr. Marc Lammers, University of Hawaii to study the annual distribution of Cetaceans in the Bay

  23. EAR’s • Variable bandwidth up to 30 kHz

  24. The future • Recordings of Blue whales • Recordings of killer whales

  25. Thank you for your attention

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