Vocalizations of male bearded seals, Erignathus barbatus: classification and geographical variation

Risch, Denise; Clark, Christopher W.; Corkeron, Peter J.; Elepfandt, Andreas; Kovacs, Kit M.; Lydersen, Christian; Stirling, Ian; Parijs, Sofie M. Van

doi:10.1016/j.anbehav.2006.06.012

Cited by 80 publications

(94 citation statements)

References 35 publications

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“…The seasonal peak of call activity in this study was longer than that reported for bearded seals elsewhere (e.g., Van Parijs et al 2001) although many studies only made recordings from March until June (Cleator et al 1989;Cleator and Stirling 1990;Risch et al 2007). Other studies have shown that some aquatic-mating pinnipeds produce calls year-round (Rouget et al 2007;Van Opzeeland et al 2010).…”

Section: Discussioncontrasting

confidence: 42%

“…Expanding the study to the Bering and Chukchi Seas will cover much of the range of Alaskan bearded seals and provide a broader picture of their seasonal occurrence under the different ice conditions they experience over this range. Finally, detailed analysis of call types can be used to determine whether or not geographic variation exists among the three seas as has been shown in other regions and with other species (Van Parijs et al 1999;Bjørgesaeter et al 2004;Risch et al 2007;Van Opzeeland et al 2009). There are potential subpopulations that reside in each region throughout the year that may be determined by comparing call types present throughout the year at each location.…”

Section: Discussionmentioning

confidence: 99%

“…Bearded seals are highly vocal and use elaborate underwater vocalizations to advertise breeding condition or establish aquatic territories (Van Parijs et al 2004;Risch et al 2007). They produce a series of frequency modulated (FM) calls that typically range in frequency from 130 to 4,800 Hz (Ray et al 1969;Stirling et al 1983).…”

Section: Introductionmentioning

confidence: 99%

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Year-round acoustic detection of bearded seals (Erignathus barbatus) in the Beaufort Sea relative to changing environmental conditions, 2008–2010

et al. 2013

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192 Hz. Spectrograms of acoustic data were examined for characteristic patterns of bearded seal vocalizations. For each recorder, the number of hours per day with vocalizations was compared with in situ water temperature and satellite-derived daily sea ice concentrations. At all sites, bearded seals were vocally active yearround. Call activity escalated with the formation of pack ice in the winter and the peak occurred in the spring, coinciding with mating season and preceding breakup of the sea ice. There was a change in the timing of seasonal sea ice formation and retreat between the two consecutive years that was reflected in the timing of peak bearded seal call activity. This study provides new information on fall and winter bearded seal vocal behavior and the relationship between year-round vocal activity and changes in annual sea ice coverage and in situ water temperature.

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Section: Discussioncontrasting

confidence: 42%

Section: Discussionmentioning

confidence: 99%

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Year-round acoustic detection of bearded seals (Erignathus barbatus) in the Beaufort Sea relative to changing environmental conditions, 2008–2010

et al. 2013

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“…Bowhead whales were identified by their moans, which typically range between 100 -400 Hz and last about 1 s (Clark and Johnson, 1984). Bearded seals were identified by their characteristic trills (Risch et al, 2007). Sperm whales were identified by their clicks, which occur at a slower pace and lower frequency than other odontocete clicks (Goold and Jones, 1995).…”

Section: Marine Mammal Acoustic Detectionmentioning

confidence: 99%

Seasonal Trends in Acoustic Detection of Marine Mammals in Baffin Bay and Melville Bay, Northwest Greenland + Supplementary Appendix 1 (See Article Tools)

Frouin‐Mouy¹,

Kowarski²,

Martin³

et al. 2017

ARCTIC

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ABSTRACT. The expansion of hydrocarbon exploration in northwest Greenland has made it increasingly important to understand the occurrence of marine mammals in the region. We describe the seasonal occurrence of marine mammals and the spatial distribution of their calls in Baffin Bay and Melville Bay. Four Autonomous Multichannel Acoustic Recorders (AMARs) were deployed during summer 2012 (late July to early October), five recorders during September 2013, and two recorders from late September 2013 to early September 2014. The call presence of several species was analyzed using automatic call detection and manual verification analysis methods. A novel approach to discern narwhal (Monodon monoceros) clicks from beluga (Delphinapterus leucas) clicks was implemented during the verification process. Narwhal calls were detected in spring and fall, showing a south-to-north migration pattern in spring and a north-to-south migration pattern in fall. Few beluga whales were detected during fall 2013 and spring 2014. Bearded seal (Erignathus barbatus) calls were detected mainly during spring (mating period). A small number of bowhead whale calls (Balaena mysticetus) were detected during fall 2013 and spring and summer 2014. For the first time at this latitude in Baffin Bay, long-finned pilot whales (Globicephala melas) and sperm whales (Physeter macrocephalus) were detected during summer and fall. Our results suggest that the presence of marine mammals in Baffin Bay and Melville Bay is governed mainly by the annual cycle of sea ice formation and decay.

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“…As opposed to other multivariate techniques such as discriminant analyses and principal component analyses, CART analyses provide a useful technique for exploring multivariate nonparametric data. Furthermore, CART analyses produce a result that is readily visually accessible (see Risch et al 2007 for a detailed explanation of this analysis). We used 9 vocal parameters for analyses of Front data except when comparing them with data from the Greenland Sea, when we used only the 7 vocal parameters obtained from both areas in the comparative analyses.…”

Section: Data Collectionmentioning

confidence: 99%

Geographic variation in vocalizations of pups and mother-pup behavior of harp seals Pagophilus groenlandicus

Opzeeland¹,

Corkeron²,

Risch³

et al. 2009

Aquat. Biol.

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All harp seal populations form breeding aggregations on the Arctic pack ice. However, pack ice conditions vary spatially and temporally among these aggregations with variation in environmental and oceanographic conditions, which may affect the behavioral interactions between mothers and their newborn pups. We investigated the variation in mother-pup behavior between harp seal breeding aggregations in the NE (Greenland Sea) and NW Atlantic coastal shelf region (Front). Acoustic cues provided by the pups are thought to be important in facilitating reunions with their mothers. Consequently, we measured variation in vocal parameters among seals to investigate geographic differences in pup vocalizations. Classification trees showed a distinctive split between Front and Greenland Sea pup vocalizations. There were no clear differences between male and female pups at the Front, where 42% of male and 38% of female pup calls could be attributed to a given individual. This contrasts with the Greenland Sea, where 55% of vocalizations of female pups were attributed to individuals compared with only 8% for males. Analyses of behavioral observations of mother-pup pairs made in the afternoon and evening showed that pups in the Greenland Sea suckled more and were more alert than pups in the Front. Further, mother-pup attendance patterns differed between sites. Mothers at the Front attended their pups 85.1% of the time, whereas mothers in the Greenland Sea attended their pups 52.2% of the time. These substantial differences between sites might be related to evolutionary changes in behavior resulting from commercial hunting or variable environmental conditions.

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Vocalizations of male bearded seals, Erignathus barbatus: classification and geographical variation

Cited by 80 publications

References 35 publications

Year-round acoustic detection of bearded seals (Erignathus barbatus) in the Beaufort Sea relative to changing environmental conditions, 2008–2010

Year-round acoustic detection of bearded seals (Erignathus barbatus) in the Beaufort Sea relative to changing environmental conditions, 2008–2010

Seasonal Trends in Acoustic Detection of Marine Mammals in Baffin Bay and Melville Bay, Northwest Greenland + Supplementary Appendix 1 (See Article Tools)

Geographic variation in vocalizations of pups and mother-pup behavior of harp seals Pagophilus groenlandicus

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