Investigating the Effect of Large Vessel Noise on Southern Resident Killer Whales Hilary B. Rollins UC Davis Beam Reach Marine Science and Sustainability.

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Presentation transcript:

Investigating the Effect of Large Vessel Noise on Southern Resident Killer Whales Hilary B. Rollins UC Davis Beam Reach Marine Science and Sustainability School

Introduction Southern Resident killer whales depend on communication Anthropogenic noise can mask killer whale calls Large vessels (ships) produce the majority of the background noise in Haro Strait Large vessel noise is very consistent and very loud and concentrated in low frequencies

Hypothesis Whales will be forced to compensate for ship noise to maintain necessary communication and will change their acoustic behavior This experiment will test changes in call duration, fundamental frequency, and power ratio depending on ship absence or presence

Methods Calibrated Labcore hydrophone array was towed and sounds were recorded on Sound Device 702s Ship absence/presence was monitored using AIS, recorded by Ship Locator software and determined by a range of 5 NM Behavior states, boats within.5 NM, and sea state were monitored

Methods S1 calls measured for call duration, fundamental frequency, power ratio 0.5 seconds of background noise measured within 3 seconds of each call 141 calls measured

S1 Call Factors AverageMinimumMaximum Duration (seconds) Fundamental Frequency (Hz) Power Ratio (relative dB)

Results Background noise varies significantly with ship absence/presence and boat count (P- value: , )

Results Background Noise Boat CountShip Absence/ Presence DurationNo significance, P- value= No significance, P- value= No significance, P- value= Fundamental Frequency No significance, P- value= No significance, P- value= No significance, P- value= Power RatioNo significance, P- value= No significance, P- value= No significance, P- value=

Results

Discussion Sample size Total behavior comparison AIS Variation in ship noise depending on design Alternate methods of vocal compensation

Acknowledgements Many, many thanks to... Dr. Jason Wood, Dr. Val Veirs, Dr. Scott Veirs, Erica Beneze, Hannah McGowan, Peter Valenzuela, Matt Williams, Captain Todd Shuster, Captain Mike Kramer, Leslie Veirs, Captain Jim Maya and the other captains of the whale watch fleet

Any Questions?