Seasonality and Distribution of Whale Calls in the North Pacific

Watkins, William A.; Daher, Mary Ann; Reppucci, Gina; George, Joseph E.; Martin, Darel L.; DiMarzio, Nancy; Gannon, Damon P.

doi:10.5670/oceanog.2000.54

Cited by 97 publications

(108 citation statements)

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“…They were among the most commonly recorded calls and were detected on more than 90% of days during four months (October, December, January, and February), but they were absent from the data during May and June. These findings are also consistent with earlier acoustic surveys for fin whales conducted farther offshore (Watkins et al 2000). …”

Section: Fin Whalessupporting

confidence: 82%

“…Blue whale calls were detected at the inshore site between August 2008 and February 2009, with peak calling from October to December (Figure 10). This seasonal presence is consistent with seasonal occurrence of blue whale calls off Washington as reported by Watkins et al (2000) and Burtenshaw et al (2004). Blue whales are not frequently sighted at this location, but the first sighting in decades was reported by visual surveys during this monitoring period (Table 2).…”

Section: Findings By Species Blue Whalessupporting

confidence: 72%

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Marine Mammal Demographics Off the Outer Washington Coast and Near Hawaii

Oleson¹,

Hildebrand²

2012

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)11-04-2012 REPORT TYPE Technical Report DATES COVERED PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) AND ADDRESS(ES)Scripps Institution of Oceanography University of California at San Diego, La Jolla, CA 92037 PERFORMING ORGANIZATION REPORT NUMBER SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR/MONITOR'S ACRONYM(S)Sponsoring Agency: CNO(N45)Monitoring Agency: NPS SPONSOR/MONITOR'S REPORT NUMBER(S) NPS-OC-12-001CR DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution is unlimited SUPPLEMENTARY NOTESThe views expressed in this report are those of the authors and do not reflect the official policy or position of the Department of Defense or the US Government 14. ABSTRACT This report summarizes work conducted in 2008-2010 to understand the seasonal occurrence and distribution of marine mammals in or near active Navy ranges off Washington and Hawaii. Long-term acoustic recording and monthly visual surveys have been conducted off the outer Washington coast since 2004 as part of an effort to monitor for marine mammals within the boundaries of the proposed expansion area of the Quinault Underwater Tracking Range (QUTR). This effort was designed to characterize the vocalizations of species present in the area, determine the year-round seasonal presence of all marine mammal species, and evaluate the distribution of marine mammals near the Navy range. Small boat visual surveys were conducted in the range, resulting in sightings of a broad range of marine mammal species throughout the year. Two High-frequency Acoustic Recording Packages (HARPs) have been deployed near the QUTR, data from which provide information on the seasonal presence of a broad range of marine mammal species. In 2008 a longterm acoustic monitoring study off the coast of Hawaii was started in cooperation with regular visual surveys conducted in the region. HARP recordings of tropical odontocetes, which may be used as reference recordings for future long-term monitoring efforts within the Hawaii Range Complex, have also been obtained, providing the first information on the seasonal occurrence...

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Section: Fin Whalessupporting

confidence: 82%

Section: Findings By Species Blue Whalessupporting

confidence: 72%

Marine Mammal Demographics Off the Outer Washington Coast and Near Hawaii

Oleson¹,

Hildebrand²

2012

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“…In some regions, fin whale 20 Hz calls can be so abundant that a constant band of noise across the bandwidth of their calls is created, making it difficult to detect individual calls (Watkins et al 2000(Watkins et al , Širović et al 2004). In those cases, an energy detector (i.e.…”

Section: Fin Whalesmentioning

confidence: 99%

Seven years of blue and fin whale call abundance in the Southern California Bight

irović¹,

Rice²,

Chou³

et al. 2015

Endang. Species. Res.

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Blue whales Balaenoptera musculus and fin whales B. physalus are common inhabitants of the Southern California Bight (SCB), but little is known about the spatial and temporal variability of their use of this area. To study their distribution in the SCB, high-frequency acoustic recording packages were intermittently deployed at 16 locations across the SCB from 2006 to 2012. Presence of blue whale B calls and fin whale 20 Hz calls was determined using 2 types of automatic detection methods, i.e. spectrogram correlation and acoustic energy detection, respectively. Blue whale B calls were generally detected between June and January, with a peak in September, with an overall total of over 3 million detections. Fin whale 20 Hz calls, measured via the fin whale call index, were present year-round, with the highest values between September and December, with a peak in November. Blue whale calls were more common at coastal sites and near the northern Channel Islands, while the fin whale call index was highest in the central and southern areas of the SCB, indicating a possible difference in habitat preferences of the 2 species in this area. Across years, a peak in blue whale call detections occurred in 2008, with minima in 2006 and 2007, but there was no long-term trend. There was an increase in the fin whale call index during this period. These trends are consistent with visual survey estimates for both species in Southern California, providing evidence that passive acoustics can be a powerful tool to monitor population trends for these endangered species.

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“…In the last decade, the use of passive acoustics has been widespread in cetacean (Watkins et al 2000, Charif et al 2001, Nieukirk et al 2004, Širović et al 2004, Moore et al 2006) and pinniped monitoring (Thomas & DeMaster 1982, Van Parijs & Clark 2006, Van Opzeeland et al 2010, Mouy et al 2012, Rogers et al 2013. The methodology has shown a high potential in surveying populations and migration movements in many areas, especially those where visual observations are rare and extremely difficult (i.e.…”

Section: Introductionmentioning

confidence: 99%

Individual signatures in the vocal repertoire of the endangered Mediterranean monk seal: new perspectives for population monitoring

Charrier

Marchesseau

Dendrinos

et al. 2017

Endang. Species. Res.

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The Mediterranean monk seal Monachus monachus is considered Endangered by the IUCN, and is the most endangered pinniped in the world. Increasing our knowledge of this species is crucial in order to further our understanding of its social behaviour, but also to develop new methods to monitor and protect it. In many species, acoustic communication plays a major role in social interactions, and vocal signals convey important information about the emitter; understanding the diverse information encoded in vocalizations is helpful in wildlife monitoring. In the present study, we used passive, audio-video surveys to describe the aerial vocal repertoire of the Mediterranean monk seal during the pupping season. An exhaustive analysis was performed on the different call types, and individual vocal signatures were investigated. A total of 5 call types were identified: bark, chirp, grunt, short scream and scream, with bark and scream being the 2 main call types. A discriminant function analysis based on 10 acoustic variables revealed that all call types except grunts can be correctly classified, with an average rate of 86.7%. Furthermore, the individual vocal signature investigated in barks and screams revealed that both call types are individually specific, showing average correct classification rates of 54.2 and 66.1% respectively. Based on these findings, future research should focus on collecting new recordings from wellidentified seals to develop a new passive acoustic monitoring system based on individual identification. This system will enable the evaluation of annual pup production and thus provide essential information on the conservation status of the Mediterranean monk seal in Greece.

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Seasonality and Distribution of Whale Calls in the North Pacific

Cited by 97 publications

References 0 publications

Marine Mammal Demographics Off the Outer Washington Coast and Near Hawaii

Marine Mammal Demographics Off the Outer Washington Coast and Near Hawaii

Seven years of blue and fin whale call abundance in the Southern California Bight

Individual signatures in the vocal repertoire of the endangered Mediterranean monk seal: new perspectives for population monitoring

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