Click characteristics of northern bottlenose whales (<i>Hyperoodon ampullatus</i>) and Sowerby's beaked whales (<i>Mesoplodon bidens</i>) off eastern Canada

Clarke, Emma; Feyrer, Laura Joan; Moors‐Murphy, Hilary; Stanistreet, Joy E.

doi:10.1121/1.5111336

Cited by 16 publications

(10 citation statements)

References 36 publications

(63 reference statements)

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“…A single animal was successfully tagged, but the animal immediately dislodged the tag (Visser 2012). Recently, a few acoustic recordings have been made of Sowerby's beaked whales, laying the groundwork for passive acoustic monitoring for the presence of this species (Cholewiak et al 2013, Stanistreet et al 2016, Stanistreet et al 2017, Clarke et al 2019. There are no data regarding this species' abundance or movement behaviour anywhere in its range.…”

Section: Introductionmentioning

confidence: 99%

Specimens of opportunity provide vital information for research and conservation regarding elusive whale species

2021

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Summary Elusive species are challenging to study and conserve because basic elements of their biology may be unknown. Specimens of opportunity provide a means of collecting information on these species and may be critical for elusive species’ conservation. We used snowball sampling to identify Sowerby’s beaked whale (Mesoplodon bidens) specimens in museums and research institutions. Snowball sampling proved highly effective: we located 180 specimens from 24 institutions in North America and Europe, 62 of which were not listed in online collections databases, resulting in the largest collated dataset for this species. Analysis of these data resulted in several new findings for this species, including significant morphological variation between specimens from different collection regions, suggesting the presence of previously unidentified population structuring in this species. These data provide critical information regarding this species and demonstrate the effectiveness of specimens of opportunity for elusive species research and conservation. We recommend other researchers consider snowball sampling when designing research projects utilizing specimens of opportunity. Our results demonstrate the usefulness of snowball sampling and specimens of opportunity to elusive species research and conservation, and the methods of our study can be readily adapted for other species.

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Section: Introductionmentioning

confidence: 99%

Specimens of opportunity provide vital information for research and conservation regarding elusive whale species

2021

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“…Several beaked whale species might occur in the study area (Kowarski et al, 2018). While Sowerby's beaked whale clicks are likely too high frequency to be detected using a sample rate of 64 kS/ s (Cholewiak et al, 2013), northern bottlenose whales and Cuvier's beaked whales could be detectable (Stanistreet et al, 2017;Kowarski et al, 2018;Clarke et al, 2019). No attempt was made here to classify detected echolocation clicks to investigate the presence of beaked whales.…”

Section: Figurementioning

confidence: 99%

Monitoring cetacean occurrence and variability in ambient sound in Scottish offshore waters

Geel¹,

Risch²,

Benjamins³

et al. 2022

Front. Remote Sens.

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The characterisation of marine soundscapes allows observation of spatiotemporal distribution of vocalising species and human activities, which can inform an assessment of their interactions. Such data are important for monitoring the ecological status of marine habitats. The Scottish Atlantic Frontier is an important habitat for a variety of cetacean species. Historic whaling has heavily impacted several species inhabiting these waters and current comprehensive information about seasonal occurrence and distribution is lacking for all species. This study presents year-round passive acoustic monitoring data from ten sites in this understudied region. The three most offshore sites were examined for baleen whale vocalisations, and four species were regularly detected. Fin whale detections peaked from October to January and were at their lowest during May and June. Humpback whale song was detected as early as January but showed a strong seasonal peak in March and April. In contrast, minke whales were detected regularly throughout the year but with a peak in detections from October to November, when sei whales were also detected. All monitoring sites showed frequent occurrence of odontocete echolocation clicks and whistles. Comprised mainly of delphinid vocalisations, whistles and clicks were detected on an almost-daily basis among the offshore sites, with a slight reduction in detections from May to July particularly among the more inshore sites. Ambient sound levels (root-mean-square sounds pressure level; SPL) varied by site and season in relation to species presence, anthropogenic contributions, and environmental conditions. Monthly median SPL across the array varied up to 18 dB within 1/3-octave bands. Throughout the year, variability in median SPL was lowest in the higher frequency bands (>10 kHz), while highest variability was found between January to July in specific lower frequency bands (<1 kHz). Results from this study demonstrate the value of passive acoustic data in providing novel baseline information about cetacean occurrence and distribution in Scottish offshore habitats where data are limited and outdated. The results will feed into statutory reporting on underwater noise, support the identification and designation of future marine protected areas for cetaceans, and help guide management of future human-marine mammal interactions in Scottish offshore waters.

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“…Frequency-modulated upsweeping click (e.g., Clarke et al, 2019) Sowerby's beaked whale (Mesoplodon bidens)…”

Section: Odontocete Click Detectormentioning

confidence: 99%

Cetacean acoustic occurrence on the US Atlantic Outer Continental Shelf from 2017 to 2020

Kowarski¹,

Martin²,

Maxner³

et al. 2022

Marine Mammal Science

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Click characteristics of northern bottlenose whales (Hyperoodon ampullatus) and Sowerby's beaked whales (Mesoplodon bidens) off eastern Canada

Cited by 16 publications

References 36 publications

Specimens of opportunity provide vital information for research and conservation regarding elusive whale species

Specimens of opportunity provide vital information for research and conservation regarding elusive whale species

Monitoring cetacean occurrence and variability in ambient sound in Scottish offshore waters

Cetacean acoustic occurrence on the US Atlantic Outer Continental Shelf from 2017 to 2020

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