Acoustic documentation of temperate odontocetes in the Bering and Chukchi Seas

Seger, Kerri D.; Miksis‐Olds, Jennifer L.

doi:10.1111/mms.12577

Cited by 10 publications

(22 citation statements)

References 30 publications

(36 reference statements)

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“…Results show that the M5 site was a typical location for beluga whales to inhabit until its complete lack of ice in 2016. Across the Pacific Arctic Corridor region, though, their vocal presence increased during the combination of a warm Bering Climate Regime and a positive anomaly in the PDO (Seger and Miksis-Olds 2019). The M8 and CH sites did not have equally long time series as M2 and M5 but are important sites for future observations in beluga whale vocal presence if the Arctic's ice extent continues to decrease annually, shifting prime beluga whale habitat space further poleward.…”

Section: Discussionmentioning

confidence: 86%

“…For sperm whales, these findings could reinforce the idea that more than a decade of data are needed to tease apart the complex relationships of this cosmopolitan species within the Pacific Arctic Corridor environment beyond water depth (Jaquet 1996;Crance and Matuoka 2018;Crance et al 2019). In terms of Risso's dolphins, though, very few detections from a few years of data provide an important discovery that the species extends farther north than previously thought (Seger and Miksis-Olds 2019). Any indication of potential habitat preference for a typically temperate species in the Pacific Arctic Corridor, regardless of data paucity and a relatively weaker, simpler GAM, is new information.…”

Section: Discussionmentioning

confidence: 95%

“…The clicks from these two species are very similar to each other (Soldevilla et al 2008) and were classified conservatively since they are not well-parameterized in the literature. Therefore, some clicks could have been miscategorized as each other or as unidentified odontocetes (Seger and Miksis-Olds 2019). The second confounding variable could be between NBHFs and beluga whales.…”

Section: Discussionmentioning

confidence: 99%

“…For a more complete review of the three typically temperate species' historically documented habitats and how they have recently been acoustically observed in the Bering and Chukchi Seas, see Seger and Miksis-Olds (2019). Studies from previous decades have suggested surface temperatures as the potential driver for their changing distributions (Guiget and Pike 1965;Leatherwood et al 1980;Dahlheim and Towell 1994;Salvadeo et al 2010;Funk et al 2011;Jefferson et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Delphinid species in general are associated with deep thermoclines in Scottish waters (Embling 2008) and a couple Pacific white-sided dolphin sightings occurred very close to shore along the Aleutian archipelago both on the Gulf of Alaska and the Bering Sea sides of the islands (Moore et al 2002). Visually, Risso's dolphins have not been documented above the 51st parallel more than once (Clark 1945), but they have been detected acoustically in recent years (Seger and Miksis-Olds 2019).…”

Section: Introductionmentioning

confidence: 99%

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A decade of marine mammal acoustical presence and habitat preference in the Bering Sea

Seger¹,

Miksis‐Olds

2020

Polar Biol

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As Arctic seas rapidly change with increased ocean temperatures and decreased sea ice extent, traditional Arctic marine mammal distributions may be altered, and typically temperate marine mammal species may shift poleward. Extant and seasonal odontocete species on the continental shelves of the Bering and Chukchi Seas include killer whales (Orcinus orca), sperm whales (Physeter microcephalus), beluga whales (Delphiapterus leucas), harbor porpoises (Phocoena phocoena), and Dall’s porpoises (Phocoenoides dalli). Newly documented, typically temperate odontocete species include Risso’s dolphins (Grampus griseus) and Pacific white-sided dolphins (Lagenorhynchus obliquidens). Until recently, recording constraints limited sampling rates, preventing the acoustic detection of many of these high frequency-producing (> 22 kHz) species in the Arctic seas. Using one of the first long-term datasets to record frequencies up to 50 kHz in these waters, clicks, buzzes, and whistles have been detected, classified, and paired with environmental data to explore which variables best parameterize habitat preference. Typically temperate species were associated temporally with cold Bering Sea Climate Regimes in tandem with negative Pacific Decadal Oscillations. Typically Arctic species’ strongest explanatory variables for distribution were largely species and site specific. Regardless of species, however, the environmental cues (e.g. percent ice cover or zooplankton community structure) marine mammals use for locating viable habitat space are ones that will change as temperatures increase. This 10-year dataset documents the current state and tracks recent dynamics of odontocetes and their habitats along the Pacific Arctic Corridor to contribute to ongoing discussions about future Arctic conditions.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A decade of marine mammal acoustical presence and habitat preference in the Bering Sea

Seger¹,

Miksis‐Olds

2020

Polar Biol

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Risso’s dolphin (Grampus griseus) in Russia with note on Xenobalanus globicipitis

Ryazanov,

Ryazanova

2023

Mar. Biodivers.

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Caller ID for Risso’s and Pacific White-sided dolphins

Al-Badrawi

Liang

Seger³

et al. 2022

Sci Rep

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Tracking species with expanding ranges is crucial to conservation efforts and some typically temperate marine species are spreading northward into the Arctic Ocean. Risso’s (Gg) and Pacific white-sided (Lo) dolphins have been documented spreading poleward. Further, they make very similar sounds, so it is difficult for both human analysts and classification algorithms to tell them apart. Using automatic detectors and classifiers on large acoustic datasets would improve the efficiency of monitoring these species. variational mode decomposition (VMD) provides both an easier visualization tool for human analysts and exhibited robustness to background noise while extracting features in pulsed signals with very similar spectral properties. The goal of this work was to develop a new visualization tool using VMD and a statistics-based classification algorithm to differentiate similar pulsed signals. The proposed VMD method achieved 81% accuracy, even when using audio files with low SNR that did not have concurrent visual survey data. While many dolphins whistle, pulsed signals are one of the more useful vocalizations to use in detection and classification because of their species-specific acoustic features. Automating the VMD method and expanding it to other dolphin species that have very similar pulsed signals would complement current detection and classification methods and lead to a more complete understanding of ecosystem dynamics under a changing climate.

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Acoustic documentation of temperate odontocetes in the Bering and Chukchi Seas

Cited by 10 publications

References 30 publications

A decade of marine mammal acoustical presence and habitat preference in the Bering Sea

A decade of marine mammal acoustical presence and habitat preference in the Bering Sea

Risso’s dolphin (Grampus griseus) in Russia with note on Xenobalanus globicipitis

Caller ID for Risso’s and Pacific White-sided dolphins

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