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• W2728245564 abstract "ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials ESR 34:251-267 (2017) - DOI: https://doi.org/10.3354/esr00848 Gunshot call production by the North Pacific right whale Eubalaena japonica in the southeastern Bering Sea Jessica L. Crance1,*, Catherine L. Berchok1, Jennifer L. Keating2 1Marine Mammal Laboratory, AFSC/NMFS/NOAA, 7600 Sand Point Way NE, Seattle, WA 98115, USA 2Marine Mammal and Turtle Division, SWFSC/NMFS/NOAA, 8901 La Jolla Shores Dr., La Jolla, CA 92037-1508, USA *Corresponding author: jessica.crance@noaa.gov ABSTRACT: During dedicated surveys for the Critically Endangered eastern stock of North Pacific right whales Eubalaena japonica (NPRW) in the Bering Sea, focal follows (FFs) were combined with passive acoustic monitoring to correlate vocal activity with dive behavior. During FFs, impulsive gunshot calls (hereafter ‘gunshots’), similar to those produced by other right whale populations, were localized to male and female NPRWs. The timing of gunshots correlated strongly with diving behavior observed during the FFs. Log survivorship analysis of inter-blow intervals showed a bout criterion interval of 40 s, separating the data into shorter surfacings and longer dives. For both, gunshots were skewed closer to the end of the sequence (modal gunshot to blow times: 5 s for dives, 7 s for surfacings) than the beginning (modal blow to gunshot times: 22 s for dives, 13 s for surfacings). Gunshots were more commonly produced during dives than surfacings. Mean gunshot calling rate during FFs was 133.0 calls h-1 (range: 38.9-425.0). Other NPRW calls, including upcalls, the predominant call used to identify right whales acoustically, were not detected during the FFs. To determine comparative call detection rates, an additional 180 h of non-FF recordings were analyzed. Gunshots were detected ~50 times more frequently than upcalls (mean: 228.3 vs. 4.3 calls h-1, respectively), with a maximum gunshot calling rate of 835.7 calls h-1. This is the first study to definitively attribute gunshots to NPRW, and demonstrates the importance of including gunshots in passive acoustic studies, which will greatly increase NPRW detectability while supporting more accurate determinations of their spatio-temporal distribution. KEY WORDS: Right whale · Passive acoustics · Gunshot call · Upcall · Communication · Focal follow Full text in pdf format PreviousNextCite this article as: Crance JL, Berchok CL, Keating JL (2017) Gunshot call production by the North Pacific right whale Eubalaena japonica in the southeastern Bering Sea. Endang Species Res 34:251-267. https://doi.org/10.3354/esr00848 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in ESR Vol. 34. Online publication date: September 26, 2017 Print ISSN: 1863-5407; Online ISSN: 1613-4796 Copyright © 2017 Inter-Research." @default.
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• W2728245564 date "2017-09-26" @default.
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• W2728245564 title "Gunshot call production by the North Pacific right whale Eubalaena japonica in the southeastern Bering Sea" @default.
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