@article {58004, title = {Seasonal variation in Arctic marine mammal acoustic detection in the northern Bering Sea}, journal = {Marine Mammal Science}, year = {2019}, month = {Dec-12-2020}, abstract = {

Declines in Arctic sea ice cover are influencing the distribution of protected endemic marine mammals, many of which are important for local Indigenous Peoples, and increasing the presence of potentially disruptive industrial activities. Due to increasing conservation concerns, we conducted the first year-round acoustic monitoring of waters off Gambell and Savoonga (St. Lawrence Island, Alaska), and in the Bering Strait to quantify vocalizing presence of bowhead whales, belugas, walruses, bearded seals, and ribbon seals. Bottom-mounted archival acoustic recorders collected data for up to 10\ months per deployment between 2012 and 2016. Spectrograms were analyzed for species-typical vocalizations, and daily detection rates and presence/absence were calculated. Generalized additive models were used to model call presence as a function of time-of-year, sea surface temperature, and sea ice concentration. We identified seasonality in call presence for all species, corroborating previous acoustic and distribution studies, and identified finer-scale spatiotemporal distribution via occurrence of call presence between different monitoring sites. Time-of-year was the strongest significant effect on call presence for all species. These data provide important information on Arctic endemic species\&$\#$39; spatiotemporal distributions in biologically and culturally important areas within a rapidly changing Arctic region.

}, issn = {0824-0469}, doi = {10.1111/mms.12658}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/mms.12658}, author = {Chou, Emily and Antunes, Ricardo and Sardelis, Stephanie and Stafford, Kathleen M. and West, Leigh and Spagnoli, Christopher and Southall, Brandon L. and Robards, Martin and Howard C. Rosenbaum} } @article {53299, title = {Differential hearing sensitivity in the adaptive background in a beluga whale}, journal = {The Journal of the Acoustical Society of America}, volume = {144}, year = {2018}, month = {Jan-09-2018}, pages = {1979 - 1979}, abstract = {

The ability of the auditory system to maintain high differential sensitivity in the adaptive background was investigated in a beluga whale (Delphinapterus leucas). Adaptive background was a train of tone pips following one another at a rate of 1 kHz. Each pip consisted of eight carrier cycles of 64 kHz. Every 128 ms, the train of pips was interrupted for 16 ms and replaced with a test signal (16-ms series of the same tone pips as in the adaptive background, but of another level). The level of the test signals varied from -15 to +\ 20 dB relative the level of adaptive background. Evoked potentials (the rate following response, RFR) produced by the test signals were recorded. Increasing of adaptive level led to RFR thresholds growth. The 10-dB rising of adaptive signals intensity level led to 7.8 dB rising of test signal threshold. The response amplitude dependence on the test stimulus level was almost independent of the level of the adaptive background. Thus, the beluga\’s auditory system displayed high sensitivity to the change in acoustic signal level in the high-level background. [This study was supported by the Russian Foundation for Basic Research (Grant No. 18-04-00088).]

}, issn = {0001-4966}, doi = {10.1121/1.5068643}, url = {http://asa.scitation.org/doi/10.1121/1.5068643}, author = {Popov, Vladimir and Nechaev, Dmitry and Supin, Alexander and Sysueva, Evgeniya} } @article {53283, title = {Burst-pulses in East Greenland narwhals: Further evidence for unique, individual-specific vocalizations}, journal = {The Journal of the Acoustical Society of America}, volume = {144}, year = {2018}, month = {Jan-09-2018}, pages = {1952 - 1952}, abstract = {

In August 2013\–2017, narwhals from Scoresby Sound, East Greenland, were instrumented with satellite-linked transmitters and acoustic sound and movement tags (AcousondeTM) over periods of up to 8 days. The records obtained provided continuous information on the whales\’ acoustic behavior during foraging and social interactions. Burst-pulses were the most easily recognizable non-feeding vocalization. They tended to occur near the surface and were more common in records that displayed higher rates of clicks from other individuals, i.e., records that presumably would include more social interactions with other narwhals. Over 100 burst pulses detected in eight subjects were analyzed in terms of their overall length and their pattern of successive inter-click intervals (ICIs). While overall length could be somewhat variable, the succession of ICIs was unique for each whale and could therefore have an identity-carrying function, as the signature whistle does in bottlenose dolphins and other odontocetes. The occurrence of these individual-specific burst-pulses in time and space will be examined in relation to other factors provided by the tags, such as the time of day, whale depth, presence of conspecifics, and behavioral state. [Work sponsored in part by the Greenland Institute of Natural Resources.]

}, issn = {0001-4966}, doi = {10.1121/1.5068535}, url = {http://asa.scitation.org/doi/10.1121/1.5068535}, author = {Blackwell, Susanna B. and Tervo, Outi M. and Heide-J{\o}rgensen, Mads P.} } @article {53269, title = {Responses of the auditory system of odontocetes to level changes of long lasting acoustical stimuli}, journal = {The Journal of the Acoustical Society of America}, volume = {144}, year = {2018}, month = {Jan-09-2018}, pages = {1741 - 1741}, abstract = {

The effects of level changes of long lasting sound stimuli (tone pip trains) on evoked potentials (the rate following response, RFR) were investigated in a beluga whale (Delphinapterus leucas). The stimuli were of 64 kHz carrier frequency at levels from 80 to 140 dB re 1 \μPa. During stimulation, the stimulus level either was kept constant (the steady-state stimulation) or was changed up/down by 20 or 40 dB every 1000 ms. After transition from a lower to upper stimulus level (increase), the response amplitude increased quickly and then decayed slowly. After transition from an upper to lower stimulus level (decrease), the response amplitude fell quickly and later recovered slowly. In the both cases, during the 1000 ms stimulus, the response amplitude almost reached that of the steady-state stimulus of the same level. The auditory system of the beluga (and, hypothetically, other odontocetes) may be characterized as quickly flexible and capable of quick adjustment of its responses to the current auditory scene. [This study was supported the Russian Science Foundation (Project No. 17-74-20107) awarded to E.V.S.]

}, issn = {0001-4966}, doi = {10.1121/1.5067719}, url = {http://asa.scitation.org/doi/10.1121/1.5067719}, author = {Sysueva, Evgeniya and Nechaev, Dmitry and Supin, Alexander and Popov, Vladimir} } @article {50507, title = {Vocalizations of captive beluga whales, Delphinapterus leucas: Additional evidence for contact signature {\textquotedblleft}mixed{\textquotedblright} calls in belugas}, journal = {Marine Mammal Science}, volume = {33}, year = {2017}, month = {Jan-07-2017}, pages = {889 - 903}, doi = {10.1111/mms.2017.33.issue-310.1111/mms.12393}, url = {http://doi.wiley.com/10.1111/mms.2017.33.issue-3}, author = {Panova, Elena and Agafonov, Alexandr and Belikov, Roman and Melnikova, Faina} } @article {16151, title = {Spatial and temporal patterns in the calling behavior of beluga whales, Delphinapterus leucas, in Cook Inlet, Alaska}, journal = {Marine Mammal Science}, volume = {33}, year = {2017}, month = {Jan-01-2017}, pages = {112 - 133}, doi = {10.1111/mms.2017.33.issue-110.1111/mms.12353}, url = {http://doi.wiley.com/10.1111/mms.2017.33.issue-1}, author = {Blevins-Manhard, Rachael and Atkinson, Shannon and Lammers, Marc} }