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Acoustic differentiation and classification of wild belugas and narwhals using echolocation clicks

Acoustic differentiation and classification of wild belugas and narwhals using echolocation clicks

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ZAHN, Marie J., Shannon RANKIN, Jennifer L. K. MCCULLOUGH, Jens C. KOBLITZ, Frederick ARCHER, Marianne H. RASMUSSEN, Kristin L. LAIDRE, 2021. Acoustic differentiation and classification of wild belugas and narwhals using echolocation clicks. In: Scientific Reports. Springer Nature. 11, 22141. eISSN 2045-2322. Available under: doi: 10.1038/s41598-021-01441-w

@article{Zahn2021-11-12Acous-55940, title={Acoustic differentiation and classification of wild belugas and narwhals using echolocation clicks}, year={2021}, doi={10.1038/s41598-021-01441-w}, volume={11}, journal={Scientific Reports}, author={Zahn, Marie J. and Rankin, Shannon and McCullough, Jennifer L. K. and Koblitz, Jens C. and Archer, Frederick and Rasmussen, Marianne H. and Laidre, Kristin L.}, note={Article Number: 22141} }

Rasmussen, Marianne H. McCullough, Jennifer L. K. Laidre, Kristin L. Acoustic differentiation and classification of wild belugas and narwhals using echolocation clicks Rankin, Shannon 2021-12-20T13:43:14Z McCullough, Jennifer L. K. Attribution 4.0 International Archer, Frederick Koblitz, Jens C. Belugas (Delphinapterus leucas) and narwhals (Monodon monoceros) are highly social Arctic toothed whales with large vocal repertoires and similar acoustic profiles. Passive Acoustic Monitoring (PAM) that uses multiple hydrophones over large spatiotemporal scales has been a primary method to study their populations, particularly in response to rapid climate change and increasing underwater noise. This study marks the first acoustic comparison between wild belugas and narwhals from the same location and reveals that they can be acoustically differentiated and classified solely by echolocation clicks. Acoustic recordings were made in the pack ice of Baffin Bay, West Greenland, during 2013. Multivariate analyses and Random Forests classification models were applied to eighty-one single-species acoustic events comprised of numerous echolocation clicks. Results demonstrate a significant difference between species’ acoustic parameters where beluga echolocation was distinguished by higher frequency content, evidenced by higher peak frequencies, center frequencies, and frequency minimums and maximums. Spectral peaks, troughs, and center frequencies for beluga clicks were generally > 60 kHz and narwhal clicks < 60 kHz with overlap between 40–60 kHz. Classification model predictive performance was strong with an overall correct classification rate of 97.5% for the best model. The most important predictors for species assignment were defined by peaks and notches in frequency spectra. Our results provide strong support for the use of echolocation in PAM efforts to differentiate belugas and narwhals acoustically. Archer, Frederick Rasmussen, Marianne H. Zahn, Marie J. eng Koblitz, Jens C. Laidre, Kristin L. Rankin, Shannon Zahn, Marie J. 2021-12-20T13:43:14Z 2021-11-12

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