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Dingwall JT, Halliday WD, Diogou N, Niemi A, Steiner N, Insley SJ. The Arctic marine soundscape of the Amundsen Gulf, Western Canadian Arctic. MARINE POLLUTION BULLETIN 2024; 204:116510. [PMID: 38805977 DOI: 10.1016/j.marpolbul.2024.116510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 05/08/2024] [Accepted: 05/16/2024] [Indexed: 05/30/2024]
Abstract
The underwater soundscape, a habitat component for Arctic marine mammals, is shifting. We examined the drivers of the underwater soundscape at three sites in the Amundsen Gulf, Northwest Territories, Canada from 2018 to 2019 and estimated the contribution of abiotic and biotic sources between 20 Hz and 24 kHz. Higher wind speeds and the presence of bearded seal (Erignathus barbatus) vocalizations led to increased SPL (0.41 dB/km/h and 3.87 dB, respectively), while higher ice concentration and air temperature led to decreased SPL (-0.39 dB/% and - 0.096 dB/°C, respectively). Other marine mammals did not significantly impact the ambient soundscape. The presence of vessel traffic led to increased SPLs (12.37 dB) but was quieter at distances farther from the recorder (-2.57 dB/log m). The presence of high frequency and broadband signals produced by ice led to increased SPLs (7.60 dB and 10.16 dB, respectively).
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Affiliation(s)
- Jacob T Dingwall
- School of Earth and Ocean Science, University of Victoria, Victoria, British Columbia, Canada; Department of Biology, University of Victoria, Victoria, British Columbia, Canada
| | - William D Halliday
- School of Earth and Ocean Science, University of Victoria, Victoria, British Columbia, Canada; Wildlife Conservation Society Canada, Whitehorse, Yukon, Canada
| | - Nikoletta Diogou
- School of Earth and Ocean Science, University of Victoria, Victoria, British Columbia, Canada; Wildlife Conservation Society Canada, Whitehorse, Yukon, Canada
| | - Andrea Niemi
- Freshwater Institute, Fisheries and Oceans Canada, Winnipeg, Manitoba, Canada
| | - Nadja Steiner
- School of Earth and Ocean Science, University of Victoria, Victoria, British Columbia, Canada; Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada
| | - Stephen J Insley
- Department of Biology, University of Victoria, Victoria, British Columbia, Canada; Wildlife Conservation Society Canada, Whitehorse, Yukon, Canada
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2
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Rycyk A, Bolaji DA, Factheu C, Kamla Takoukam A. Using transfer learning with a convolutional neural network to detect African manatee (Trichechus senegalensis) vocalizations. JASA EXPRESS LETTERS 2022; 2:121201. [PMID: 36586963 DOI: 10.1121/10.0016543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
African manatees (Trichechus senegalensis) are vulnerable, understudied, and difficult to detect. Areas where African manatees are found were acoustically sampled and deep learning techniques were used to develop the first African manatee vocalization detector. A transfer learning approach was used to develop a convolutional neural network (CNN) using a pretrained CNN (GoogLeNet). The network was highly successful, even when applied to recordings collected from a different location. Vocal detections were more common at night and tended to occur within less than 2 min of one another.
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Affiliation(s)
- Athena Rycyk
- New College of Florida, Sarasota, Florida 34243, USA
| | | | - Clinton Factheu
- African Marine Mammal Conservation Organization, Yaoundé, Centre Region, , , ,
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3
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Rycyk AM, Berchem C, Marques TA. Estimating Florida manatee (Trichechus manatus latirostris) abundance using passive acoustic methods. JASA EXPRESS LETTERS 2022; 2:051202. [PMID: 36154061 DOI: 10.1121/10.0010495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Manatees are difficult to detect, particularly cryptic populations that inhabit areas with limited water clarity. The effectiveness of using vocal detections to estimate manatee abundance was evaluated in a clear water spring where manatees congregate seasonally. Vocalizations were extracted by a detection classifier that clustered sounds with similar spectral properties. Vocalization counts from recordings in Blue Spring, FL, USA were strong predictors of manatee abundance. The link between independent visual counts and abundance estimates from passive acoustic monitoring was used to provide an estimate of 1.059 (95% confidence interval 0.963-1.127) vocalizations/manatee/5-min, which might be used elsewhere for cue counting of manatees.
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Affiliation(s)
- Athena M Rycyk
- Division of Natural Sciences, New College of Florida, Sarasota, Florida 34243, USA
| | - Cora Berchem
- Save the Manatee Club, Maitland Florida 32751, USA
| | - Tiago A Marques
- Centre for Research into Ecological and Environmental Modelling, University of St Andrews, St Andrews, KY16 9LZ, Scotland ; ;
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Stafford KM, Melling H, Moore SE, Berchok CL, Braen EK, Brewer AM, Kimber BM. Marine mammal detections on the Chukchi Plateau 2009-2020. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2022; 151:2521. [PMID: 35461500 DOI: 10.1121/10.0010208] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 03/28/2022] [Indexed: 06/14/2023]
Abstract
The Arctic Ice Monitoring (AIM) observatory has been maintained on the Chukchi Plateau at 75.1° N 168.0° W nearly continuously since 2003. The AIM site consists of a submerged mooring that, since October 2008, has been instrumented with a passive acoustic recorder to sample ambient sound, with a focus on marine mammal detections in the High Arctic. Year-long data sets for 2009, 2012, and 2014-2020 were analyzed for the presence of signals from Arctic species including bowhead and beluga whales, bearded seals, and walrus. Calls from subarctic ribbon seals were commonly detected in autumn months, suggesting they have expanded their distribution much further northward. Killer whale calls were detected in recent years providing evidence that they have moved further north into the Pacific Arctic. No other subarctic cetaceans were heard. Year-round passive acoustic sampling of sounds produced by marine mammals over a decadal timescale has enhanced our understanding of how climate-driven changes in biodiversity are affecting even the very High Arctic.
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Affiliation(s)
- Kathleen M Stafford
- Applied Physics Laboratory, University of Washington, Seattle, Washington 98105, USA
| | - Humfrey Melling
- Department of Fisheries and Oceans, Institute of Ocean Sciences, Victoria, British Columbia V8L 4B2, Canada
| | - Sue E Moore
- Center for Ecosystem Sentinels, Department of Biology, University of Washington, Seattle, Washington 98105, USA
| | - Catherine L Berchok
- Marine Mammal Laboratory, National Marine Fisheries Service, Seattle, Washington 98115, USA
| | - Eric K Braen
- Cooperative Institute for Climate, Ocean & Ecosystem Studies, University of Washington, Seattle, Washington 98105, USA
| | - Arial M Brewer
- Cooperative Institute for Climate, Ocean & Ecosystem Studies, University of Washington, Seattle, Washington 98105, USA
| | - Brynn M Kimber
- Cooperative Institute for Climate, Ocean & Ecosystem Studies, University of Washington, Seattle, Washington 98105, USA
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5
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Escobar-Amado CD, Badiey M, Pecknold S. Automatic detection and classification of bearded seal vocalizations in the northeastern Chukchi Sea using convolutional neural networks. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2022; 151:299. [PMID: 35105050 DOI: 10.1121/10.0009256] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
Bearded seals vocalizations are often analyzed manually or by using automatic detections that are manually validated. In this work, an automatic detection and classification system (DCS) based on convolutional neural networks (CNNs) is proposed. Bearded seal sounds were year-round recorded by four spatially separated receivers on the Chukchi Continental Slope in Alaska in 2016-2017. The DCS is divided in two sections. First, regions of interest (ROI) containing possible bearded seal vocalizations are found by using the two-dimensional normalized cross correlation of the measured spectrogram and a representative template of two main calls of interest. Second, CNNs are used to validate and classify the ROIs among several possible classes. The CNNs are trained on 80% of the ROIs manually labeled from one of the four spatially separated recorders. When validating on the remaining 20%, the CNNs show an accuracy above 95.5%. To assess the generalization performance of the networks, the CNNs are tested on the remaining recorders, located at different positions, with a precision above 89.2% for the main class of the two types of calls. The proposed technique reduces the laborious task of manual inspection prone to inconstant bias and possible errors in detections.
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Affiliation(s)
| | - Mohsen Badiey
- Department of Electrical Engineering, University of Delaware, Newark, Delaware 19716, USA
| | - Sean Pecknold
- Defence Research and Development Canada, Dartmouth, Nova Scotia, B3K 5X5, Nova Scotia, Canada
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Thode AM, Norman RG, Conrad AS, Tenorio-Hallé L, Blackwell SB, Kim KH. Measurements of open-water arctic ocean noise directionality and transport velocity. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2021; 150:1954. [PMID: 34598615 DOI: 10.1121/10.0006206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 08/19/2021] [Indexed: 06/13/2023]
Abstract
Measurements from bottom-mounted acoustic vector sensors, deployed seasonally between 2008 and 2014 on the shallow Beaufort Sea shelf along the Alaskan North Slope, are used to estimate the ambient sound pressure power spectral density, acoustic transport velocity of energy, and dominant azimuth between 25 and 450 Hz. Even during ice-free conditions, this region has unusual acoustic features when compared against other U.S. coastal regions. Two distinct regimes exist in the diffuse ambient noise environment: one with high pressure spectral density levels but low directionality, and another with lower spectral density levels but high directionality. The transition between the two states, which is invisible in traditional spectrograms, occurs between 73 and 79 dB re 1 μPa2/Hz at 100 Hz, with the transition region occurring at lower spectral levels at higher frequencies. Across a wide bandwidth, the high-directionality ambient noise consistently arrives from geographical azimuths between 0° and 30° from true north over multiple years and locations, with a seasonal interquartile range of 40° at low frequencies and high transport velocities. The long-term stability of this directional regime, which is believed to arise from the dominance of wind-driven sources along an east-west coastline, makes it an important feature of arctic ambient sound.
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Affiliation(s)
- Aaron M Thode
- Marine Physical Laboratory, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093-0238, USA
| | - Robert G Norman
- Greeneridge Sciences, Inc., 5266 Hollister Ave, Suite 107, Santa Barbara, California 93111, USA
| | - Alexander S Conrad
- Greeneridge Sciences, Inc., 5266 Hollister Ave, Suite 107, Santa Barbara, California 93111, USA
| | - Ludovic Tenorio-Hallé
- Marine Physical Laboratory, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093-0238, USA
| | - Susanna B Blackwell
- Greeneridge Sciences, Inc., 5266 Hollister Ave, Suite 107, Santa Barbara, California 93111, USA
| | - Katherine H Kim
- Greeneridge Sciences, Inc., 5266 Hollister Ave, Suite 107, Santa Barbara, California 93111, USA
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7
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Bearded seal (Erignathus barbatus) vocalizations across seasons and habitat types in Svalbard, Norway. Polar Biol 2021. [DOI: 10.1007/s00300-021-02874-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractMale bearded seals (Erignathus barbatus) use vocal displays to attract females and to compete with other males during the mating season. This makes it possible to monitor breeding populations of this species using passive acoustic monitoring (PAM). This study analysed year-round acoustic data records from AURAL instruments in Svalbard (Norway) to investigate seasonal variation in the acoustic presence of male bearded seals and the phenology of different call types (long, step and sweep trills) at three sites representing a variety of habitats with varied ice conditions. Male bearded seals vocalized for an extended period at a drift-ice site (Atwain; January–July) north of Spitsbergen, while the vocal season was shorter at a High Arctic land-fast-ice site (Rijpfjorden; February–June) and shorter yet again at a west-coast site that has undergone dramatic reductions in sea ice cover over the last 1.5 decades (Kongsfjorden; April–June). Generalized Additive Models showed marked seasonal segregation in the use of different trill types at Atwain, where call rates reached 400 per h, with long trills being the most numerous call type. Modest segregation of trill types was seen at Rijpfjorden, where call rates reached 300 per h, and no segregation occurred in Kongsfjorden (peak call rate 80 per h). Sea ice cover was available throughout the vocal season at Atwain and Rijpfjorden, while at Kongsfjorden peak vocal activity (May–June) occurred after the sea ice disappeared. Ongoing climate warming and sea ice reductions will likely increase the incidence of such mismatches and reduce breeding habitat for bearded seals.
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Acoustic Presence of Dolphins through Whistles Detection in Mediterranean Shallow Waters. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2021. [DOI: 10.3390/jmse9010078] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The evaluation of acoustic temporal rhythms in wide-ranging cetaceans can reveal patterns in animal spatial presence and the occurrence of periodical phenomena. Here, we aimed at assessing the temporal patterns of dolphin’s acoustic presence in a shallow-water area in the Sicily Strait (Mediterranean Sea). Whistles were collected continuously for 14 months from an acoustic monitoring station installed aboard of an elastic seamark. Over a total of 6955 h of recording, 14,048 signals were identified using both automatic and visual methods. Three parameters were analyzed: hourly presence (HP), used as a proxy of the presence of dolphins in the area; detection rate (DR), indicating the acoustic activity rate of dolphins measured per hour in the entire dataset; and detection rate in presence of dolphins (DRD), indicating the acoustic activity rate of dolphins considering only the hours when whistles were recorded. The highest values of both HP and DR were reached during the night, and the Autumn and Winter months, suggesting an increase in the dolphin’s occurrence and a possible moving away and towards the monitoring station potentially following prey. DRD, instead, showed an almost uniform distribution throughout the day implying that when the animals are close to the monitoring station, the acoustic activity does not show any pattern. However, possible changes in the communication exchange along the seasons were suggested. This study complements other work on this subject, improving the knowledge of dolphins’ acoustic activity in the area.
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9
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Auditory biology of bearded seals (Erignathus barbatus). Polar Biol 2020. [DOI: 10.1007/s00300-020-02736-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Seasonal detections of bearded seal (Erignathus barbatus) vocalizations in Baffin Bay and Davis Strait in relation to sea ice concentration. Polar Biol 2020. [DOI: 10.1007/s00300-020-02723-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Movement, diving, and haul-out behaviors of juvenile bearded seals in the Bering, Chukchi and Beaufort seas, 2014–2018. Polar Biol 2020. [DOI: 10.1007/s00300-020-02710-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Seasonal variations in the call presence of bearded seals in relation to sea ice in the southern Chukchi Sea. Polar Biol 2019. [DOI: 10.1007/s00300-019-02569-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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de Vincenzi G, Parisi I, Torri M, Papale E, Mazzola S, Nuth C, Buscaino G. Influence of environmental parameters on the use and spatiotemporal distribution of the vocalizations of bearded seals (Erignathus barbatus) in Kongsfjorden, Spitsbergen. Polar Biol 2019. [DOI: 10.1007/s00300-019-02514-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Halliday W, Pine M, Insley S, Soares R, Kortsalo P, Mouy X. Acoustic detections of Arctic marine mammals near Ulukhaktok, Northwest Territories, Canada. CAN J ZOOL 2019. [DOI: 10.1139/cjz-2018-0077] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The Arctic marine environment is changing rapidly through a combination of sea ice loss and increased anthropogenic activity. Given these changes can affect marine animals in a variety of ways, understanding the spatial and temporal distributions of Arctic marine animals is imperative. We use passive acoustic monitoring to examine the presence of marine mammals near Ulukhaktok, Northwest Territories, Canada, from October 2016 to April 2017. We documented bowhead whale (Balaena mysticetus Linnaeus, 1758) and beluga whale (Delphinapterus leucas (Pallas, 1776)) vocalizations later into the autumn than expected, and we recorded bowhead whales in early April. We recorded ringed seal (Pusa hispida (Schreber, 1775)) vocalizations throughout our deployment, with higher vocal activity than in other studies and with peak vocal activity in January. We recorded bearded seals (Erignathus barbatus (Erxleben, 1777)) throughout the deployment, with peak vocal activity in February. We recorded lower bearded seal vocal activity than other studies, and almost no vocal activity near the beginning of the spring breeding season. Both seal species vocalized more when ice concentration was high. These patterns in vocal activity document the presence of each species at this site over autumn and winter and are a useful comparison for future monitoring.
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Affiliation(s)
- W.D. Halliday
- Wildlife Conservation Society Canada, 169 Titanium Way, Whitehorse, YT Y1A 0E9, Canada
- Department of Biology, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada
| | - M.K. Pine
- Wildlife Conservation Society Canada, 169 Titanium Way, Whitehorse, YT Y1A 0E9, Canada
- Department of Biology, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada
| | - S.J. Insley
- Wildlife Conservation Society Canada, 169 Titanium Way, Whitehorse, YT Y1A 0E9, Canada
- Department of Biology, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada
| | - R.N. Soares
- Wildlife Conservation Society Canada, 169 Titanium Way, Whitehorse, YT Y1A 0E9, Canada
| | - P. Kortsalo
- Wildlife Conservation Society Canada, 169 Titanium Way, Whitehorse, YT Y1A 0E9, Canada
| | - X. Mouy
- School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada
- JASCO Applied Science Ltd., 2305-4464 Markham Street, Victoria, BC V8Z 7X8, Canada
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Rogers TL. Calling underwater is a costly signal: size-related differences in the call rates of Antarctic leopard seals. Curr Zool 2018; 63:433-443. [PMID: 29492003 PMCID: PMC5804190 DOI: 10.1093/cz/zox028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 04/10/2017] [Indexed: 11/25/2022] Open
Abstract
It is proposed that where sexually selected vocal communication is an honest signal, the call production rate is predicted to change throughout the breeding season. Male leopard seals call underwater for many hours each day over their three- to four-month breeding season, and it is hypothesized that a decrease in calling rate would be associated with the declining body condition of smaller males. The calling rates of leopard seals were measured (N = 49 recordings) and compared between seals of different size classes throughout the breeding season. Male leopard seals produce their calls at more stable rates as they become larger. In this study, larger male leopard seals adopted a strategy of consistent underwater calling throughout the breeding season, whereas there was a breakdown in the calling stereotypy of the smaller males at its height. Toward the end of the breeding season, the smaller seals produced fewer calls in shortened calling bouts, and they took more rest periods. Therefore, underwater calling may represent an honest signal in the leopard seal. For marine mammals that call underwater, the production of repetitive sequences advertises the breath-holding ability of the caller to the listeners, and this ability may be related to male stamina and endurance, thus representing an honest signal that could be widespread in other species.
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Affiliation(s)
- Tracey L Rogers
- Evolution & Ecology Research Centre, School of BEES, University of New South Wales, Sydney, Sydney NSW 2052, Australia
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Parisi I, de Vincenzi G, Torri M, Papale E, Mazzola S, Bonanno A, Buscaino G. Underwater vocal complexity of Arctic seal Erignathus barbatus in Kongsfjorden (Svalbard). THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2017; 142:3104. [PMID: 29195481 DOI: 10.1121/1.5010887] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this study the description of underwater vocal repertoire of bearded seal in Svalbard (Norway) was extended. Two autonomous passive acoustic recorders were deployed for one year (August 2014-July 2015) in the inner and outer parts of the Kongsfjorden, and 1728 h were recorded and 17 220 vocalizations were found. Nine different vocalization classes were identified and characterized using ten acoustic parameters. The calls showed heterogeneous spectral features, but share the descending trend of frequency modulation. The different classes emerged were discriminated primarily by bandwidth and duration, and then by minimum frequency, central frequency, and maximum frequency in this order. This study represents a step forward to improve the understanding of the acoustic behaviour and the social function of these calls, and identified long passive acoustic monitoring as an effective method to assess vocal complexity and the ecology of marine species producing sounds.
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Affiliation(s)
- Ignazio Parisi
- National Research Council, Institute for Coastal Marine Environment, Bioacousticslab Capo Granitola, Via del Mare, Campobello di Mazara (TP), 6-91021 Torretta Granitola, Italy
| | - Giovanni de Vincenzi
- National Research Council, Institute for Coastal Marine Environment, Bioacousticslab Capo Granitola, Via del Mare, Campobello di Mazara (TP), 6-91021 Torretta Granitola, Italy
| | - Marco Torri
- National Research Council, Institute for Coastal Marine Environment, Via del Mare, Campobello di Mazara (TP), 6-91021 Torretta Granitola, Italy
| | - Elena Papale
- National Research Council, Institute for Coastal Marine Environment, Bioacousticslab Capo Granitola, Via del Mare, Campobello di Mazara (TP), 6-91021 Torretta Granitola, Italy
| | - Salvatore Mazzola
- National Research Council, Institute for Coastal Marine Environment, Bioacousticslab Capo Granitola, Via del Mare, Campobello di Mazara (TP), 6-91021 Torretta Granitola, Italy
| | - Angelo Bonanno
- National Research Council, Institute for Coastal Marine Environment, Via del Mare, Campobello di Mazara (TP), 6-91021 Torretta Granitola, Italy
| | - Giuseppa Buscaino
- National Research Council, Institute for Coastal Marine Environment, Bioacousticslab Capo Granitola, Via del Mare, Campobello di Mazara (TP), 6-91021 Torretta Granitola, Italy
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Beltran RS, Testa JW, Burns JM. An agent-based bioenergetics model for predicting impacts of environmental change on a top marine predator, the Weddell seal. Ecol Modell 2017. [DOI: 10.1016/j.ecolmodel.2017.02.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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18
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Seasonal marine mammal occurrence detected from passive acoustic monitoring in Scott Inlet, Nunavut, Canada. Polar Biol 2016. [DOI: 10.1007/s00300-016-2040-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Mizuguchi D, Tsunokawa M, Kawamoto M, Kohshima S. Underwater vocalizations and associated behavior in captive ringed seals (Pusa hispida). Polar Biol 2015. [DOI: 10.1007/s00300-015-1821-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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