Distinctions in Sound Patterns of Calls by Killer Whales (Orcinus Orca) from Analysis of Computed Sound Features

Watkins, William A.; Daher, Mary A.; DiMarzio, Nancy; Reppucci, Gina

doi:10.21236/ada341030

Cited by 2 publications

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“…Discrete stereotyped calls were composed of one or more pulsed components (Ford, 1987;Watkins et al, 1998) separated by transitions lasting a few milliseconds and differing in time-frequency profile, pulse structure and timbre. Call types were incorporated into the study ethogram after they had been cataloged at least five times, either within the study period or before it (supplementary material Tables S1-S3).…”

Section: Data Collectionmentioning

confidence: 99%

Evidence for vocal learning in juvenile male killer whales,Orcinus orca, from an adventitious cross-socializing experiment

Crance

Bowles

Garver

2014

Journal of Experimental Biology

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Killer whales (Orcinus orca) are thought to learn their vocal dialect. Dispersal in the species is rare, but effects of shifts in social association on the dialect can be studied under controlled conditions. Individual call repertoires and social association were measured in three adult female killer whales and three males (two juveniles and an adult) during two periods, 2001-2003 and 2005-2006. Three distinct dialect repertoires were represented among the subjects. An adventitious experiment in social change resulted from the birth of a calf and the transfer of two non-focal subjects in 2004. Across the two periods, 1691 calls were collected, categorized and attributed to individuals. Repertoire overlap for each subject dyad was compared with an index of association. During 2005-2006, the two juvenile males increased association with the unrelated adult male. By the end of the period, both had begun producing novel calls and call features characteristic of his repertoire. However, there was little or no reciprocal change and the adult females did not acquire his calls. Repertoire overlap and association were significantly correlated in the first period. In the second, median association time and repertoire similarity increased, but the relationship was only marginally significant. The results provided evidence that juvenile male killer whales are capable of learning new call types, possibly stimulated by a change in social association. The pattern of learning was consistent with a selective convergence of male repertoires.

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Section: Data Collectionmentioning

confidence: 99%

Evidence for vocal learning in juvenile male killer whales,Orcinus orca, from an adventitious cross-socializing experiment

Crance

Bowles

Garver

2014

Journal of Experimental Biology

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Vocalization characteristics of North Atlantic right whale surface active groups in the calving habitat, southeastern United States

Trygonis

Gerstein

Moir

et al. 2013

The Journal of the Acoustical Society of America

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Passive acoustic surveys were conducted to assess the vocal behavior of North Atlantic right whales (Eubalaena glacialis) in the designated critical calving habitat along the shallow coastal waters of southeastern United States. Underwater vocalizations were recorded using autonomous buoys deployed in close proximity to surface active groups (SAGs). Nine main vocalization types were identified with manual inspection of spectrograms, and standard acoustic descriptors were extracted. Classification trees were used to examine the distinguishing characteristics of calls and quantify their variability within the SAG vocal repertoire. The results show that descriptors of frequency, bandwidth, and spectral disorder are the most important parameters for partitioning the SAG repertoire, contrary to duration-related measures. The reported source levels and vocalization statistics provide sound production data vital to inform regional passive acoustic monitoring and conservation for this endangered species.

show abstract

Distinctions in Sound Patterns of Calls by Killer Whales (Orcinus Orca) from Analysis of Computed Sound Features

Cited by 2 publications

References 0 publications

Evidence for vocal learning in juvenile male killer whales,Orcinus orca, from an adventitious cross-socializing experiment

Evidence for vocal learning in juvenile male killer whales,Orcinus orca, from an adventitious cross-socializing experiment

Vocalization characteristics of North Atlantic right whale surface active groups in the calving habitat, southeastern United States

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