Vocalization of Naive Captive Dolphins in Small Groups

Caldwell, Melba C.; Caldwell, David K.

doi:10.1126/science.159.3819.1121

Cited by 166 publications

(94 citation statements)

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“…Although sound rates may not give detailed information regarding referential aspects of animals' communication (Clay et al, 2012), it might still shed light about the general arousal levels of the individuals during diff erent conditions (Weary and Fraser, 1995;Grandin, 1998;Frohoff et al, 2004;Monticelli et al, 2004). Among mammals, dolphins possess a very complex communication system (Caldwell and Caldwell, 1968;Puente and Dewbury, 1976;Sjare and Smith, 1986;Dawson and Thorpe, 1990;Weilgart and Whitehead, 1990 ;Norris et al, 1994;BarrettLennard et al, 1996;Herzing, 1996) and like primates (Owing and Virginia, 1978;Mitami and Nishida, 1993 ;Rendall et al, 2000), they can convey information regarding behavioral or environmental changes either by producing particular types of calls (Esch et al, 2009;Hawkins and Gardside, 2010) or with the variations of their rates. Therefore, acoustic monitoring should represent a tool to gather information on activity patterns, health conditions of captive cetaceans in order to improve the quality of their life (Castellote and Fossa, 2006;Akiyama and Ohta, 2007;Therrien et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

Variation in the emission rate of sounds in a captive group of false killer whales Pseudorca crassidens during feedings: possible food anticipatory vocal activity?

Platto

Wang

2015

Chin. J. Ocean. Limnol.

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This study examines whether a group of captive false killer whales ( Pseudorca crassidens ) showed variations in the vocal rate around feeding times. The high level of motivation to express appetitive behaviors in captive animals may lead them to respond with changes of the behavioral activities during the time prior to food deliveries which are referred to as food anticipatory activity. False killer whales at Qingdao Polar Ocean World (Qingdao, China) showed signifi cant variations of the rates of both the total sounds and sound classes (whistles, clicks, and burst pulses) around feedings. Precisely, from the Transition interval that recorded the lowest vocalization rate (3.40 s/m/d), the whales increased their acoustic emissions upon trainers' arrival (13.08 s/m/d). The high rate was maintained or intensifi ed throughout the food delivery (25.12 s/m/d), and then reduced immediately after the animals were fed (9.91 s/m/d). These changes in the false killer whales sound production rates around feeding times supports the hypothesis of the presence of a food anticipatory vocal activity. Although sound rates may not give detailed information regarding referential aspects of the animal communication it might still shed light about the arousal levels of the individuals during diff erent social or environmental conditions. Further experiments should be performed to assess if variations of the time of feeding routines may aff ect the vocal activity of cetaceans in captivity as well as their welfare.

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Section: Resultsmentioning

confidence: 99%

Variation in the emission rate of sounds in a captive group of false killer whales Pseudorca crassidens during feedings: possible food anticipatory vocal activity?

Platto

Wang

2015

Chin. J. Ocean. Limnol.

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“…Common dolphins produce whistles, burst pulses, and echolocation click trains ͑Au, 1993; Caldwell and Caldwell, 1968;Moore and Ridgway, 1995͒. Their whistles have a mean duration of 0.8 s, a mean minimum frequency of 7.4 kHz, a mean maximum frequency of 13.6 kHz, and a mean of 1.2 inflection points ͑Oswald et al, 2003͒.…”

Section: A Data Collection and Species Call Descriptionsmentioning

confidence: 99%

Gaussian mixture model classification of odontocetes in the Southern California Bight and the Gulf of California

Roch

Soldevilla

Burtenshaw

et al. 2007

The Journal of the Acoustical Society of America

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A method for the automatic classification of free-ranging delphinid vocalizations is presented. The vocalizations of short-beaked and long-beaked common ͑Delphinus delphis and Delphinus capensis͒, Pacific white-sided ͑Lagenorhynchus obliquidens͒, and bottlenose ͑Tursiops truncatus͒ dolphins were recorded in a pelagic environment of the Southern California Bight and the Gulf of California over a period of 4 years. Cepstral feature vectors are extracted from call data which contain simultaneous overlapping whistles, burst-pulses, and clicks from a single species. These features are grouped into multisecond segments. A portion of the data is used to train Gaussian mixture models of varying orders for each species. The remaining call data are used to test the performance of the models. Species are predicted based upon probabilistic measures of model similarity with test segment groups having durations between 1 and 25 s. For this data set, 256 mixture Gaussian mixture models and segments of at least 10 s of call data resulted in the best classification results. The classifier predicts the species of groups with 67%-75% accuracy depending upon the partitioning of the training and test data.

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“…Other delphinids that have been reported to produce signature whistles include Indo-Pacific bottlenose dolphins (Tursiops aduncus) (Gridley et al, 2014), short-beaked common dolphins (Delphinus delphis) (Caldwell and Caldwell, 1968), Atlantic spotted dolphins (Stenella frontalis) (Caldwell et al, 1973), and Indo-Pacific humpback dolphins (Sousa chinensis) (Van Parijs and Corkeron, 2001). Repeated call types have been reported in other delphinid species, including the Guiana dolphin (Sotalia guianensis) (de Figueiredo and Simao, 2009), northern right whale dolphin (Lissodelphis borealis) (Rankin et al, 2007), and short-finned pilot whale (Globicephala macrorhyncus) , but it is not known whether any are individually specific.…”

Section: Introductionmentioning

confidence: 99%

Repeated call types in Hawaiian melon-headed whales (Peponocephala electra)

Kaplan

Mooney

Sayigh

et al. 2014

The Journal of the Acoustical Society of America

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Melon-headed whales are pantropical odontocetes that are often found near oceanic islands. While considered sound-sensitive, their bioacoustic characteristics are relatively poorly studied. The goal of this study was to characterize the vocal repertoire of melon-headed whales to determine whether they produce repeated calls that could assist in recognition of conspecifics. The first tag-based acoustic recordings of three melon-headed whales were analyzed. Tag records were visually and aurally inspected and all calls were individually extracted. Non-overlapping calls with sufficient signal-to-noise were then parameterized and visually grouped into categories of repeated call types. Thirty-six call categories emerged. Categories differed significantly in duration, peak and centroid frequency, and À3 dB bandwidth. Calls of a given type were more likely to follow each other than expected. These data suggest that repeated calls may function in individual, subgroup, or group recognition. Repeated call production could also serve to enhance signal detection in large groups with many individuals producing simultaneous calls. Results suggest that caution should be used in developing automatic classification algorithms for this species based on small sample sizes, as they may be dominated by repeated calls from a few individuals, and thus not representative of species-or population-specific acoustic parameters.

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Vocalization of Naive Captive Dolphins in Small Groups

Cited by 166 publications

References 1 publication

Variation in the emission rate of sounds in a captive group of false killer whales Pseudorca crassidens during feedings: possible food anticipatory vocal activity?

Variation in the emission rate of sounds in a captive group of false killer whales Pseudorca crassidens during feedings: possible food anticipatory vocal activity?

Gaussian mixture model classification of odontocetes in the Southern California Bight and the Gulf of California

Repeated call types in Hawaiian melon-headed whales (Peponocephala electra)

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