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The behavioral context of common dolphin (Delphinus sp.) vocalizations

Identifieur interne : 000108 ( Main/Exploration ); précédent : 000107; suivant : 000109

The behavioral context of common dolphin (Delphinus sp.) vocalizations

Auteurs : E. E. Henderson [Oman] ; J. A. Hildebrand [Oman] ; M. H. Smith [États-Unis] ; E. A. Falcone [États-Unis]

Source :

RBID : ISTEX:6CD386276D1A41235E3374EDE7C432EBEF6A1240

Descripteurs français

English descriptors

Abstract

Correlations between surface behavior and concurrent underwater vocalizations were modeled for common dolphins (Delphinus spp.) in the Southern California Bight (SCB) over multiple field seasons. Clicks, pulsed calls, and whistles were examined, with a total of 50 call features identified. Call features were used to classify behavior using random forest decision trees, with rates of correct classification reaching 80.6% for fast travel, 84.6% for moderate travel, 59.8% for slow travel, and 58% for foraging behavior. Common dolphins spent most of their time traveling. The highest number of clicks, pulsed calls, and complex whistles were produced during fast travel. In contrast, during foraging there were few pulsed calls and whistles produced, and the whistles were simple with narrow bandwidths and few harmonics. Behavior and vocalization patterns suggest nocturnal foraging in offshore waters as the primary feeding strategy. Group size and spacing were strongly correlated with behavior and rates of calling, with higher call rates in dispersed traveling groups and lower call rates in loosely aggregated foraging groups. These results demonstrate that surface behavior can be classified using vocalization data, which builds the framework for behavioral studies of common dolphins using passive acoustic monitoring techniques.

Url:
DOI: 10.1111/j.1748-7692.2011.00498.x


Affiliations:


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Le document en format XML

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<term>Acoustic data</term>
<term>Acoustic detections</term>
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<term>Delphinapterus leucas</term>
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<term>Unpublished data</term>
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<term>Acoustic detections</term>
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<term>Behavioral data</term>
<term>Behavioral ecology</term>
<term>Behavioral sampling</term>
<term>Behavioral sampling methods</term>
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<term>Behavioral states</term>
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<term>British isles</term>
<term>Burst pulse</term>
<term>Burst pulses</term>
<term>California press</term>
<term>Canadian journal</term>
<term>Clemente island</term>
<term>Click</term>
<term>Click bouts</term>
<term>Click length</term>
<term>Click trains</term>
<term>Common dolphin</term>
<term>Common dolphin groups</term>
<term>Common dolphin vocalizations</term>
<term>Common dolphin whistles</term>
<term>Common dolphins</term>
<term>Comparative physiology</term>
<term>Correct prediction rates</term>
<term>Correct rates</term>
<term>Daytime foraging</term>
<term>Deeper waters</term>
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<term>Delphinapterus leucas</term>
<term>Delphinus</term>
<term>Delphinus delphis</term>
<term>Delphinus delphus</term>
<term>Dolphin</term>
<term>Dolphin groups</term>
<term>Dominant behavior</term>
<term>Dusky dolphins</term>
<term>Early morning</term>
<term>Echolocation</term>
<term>Echolocation clicks</term>
<term>Ecology</term>
<term>Epipelagic schooling</term>
<term>Error rate</term>
<term>Face side</term>
<term>Feature data</term>
<term>Fewest</term>
<term>Fewest clicks</term>
<term>Fewest number</term>
<term>Flip</term>
<term>Foraging</term>
<term>Foraging behavior</term>
<term>Foraging bouts</term>
<term>Foraging groups</term>
<term>Forest models</term>
<term>Genus delphinus</term>
<term>Gilman drive</term>
<term>Globicephala melaena</term>
<term>Group size</term>
<term>Group spacing</term>
<term>Group spacing data</term>
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<term>Hawaiian spinner dolphins</term>
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<term>Humpback dolphins</term>
<term>Hydrophones</term>
<term>Independent groups</term>
<term>Individual whistles</term>
<term>Instrument platform</term>
<term>Interobserver differences</term>
<term>Killer whales</term>
<term>Large groups</term>
<term>Larger groups</term>
<term>Largest groups</term>
<term>Late afternoon</term>
<term>Mammal</term>
<term>Marine mammal</term>
<term>Marine mammal science</term>
<term>Marine mammals</term>
<term>Maximum frequencies</term>
<term>Median</term>
<term>Median distance</term>
<term>Megan mckenna</term>
<term>Model results</term>
<term>Moderate travel</term>
<term>Monitoring techniques</term>
<term>More whistles</term>
<term>Nest observers</term>
<term>Neumann</term>
<term>Ongoing behavior</term>
<term>Other behaviors</term>
<term>Pilot whales</term>
<term>Primary behavior</term>
<term>Random forest decision trees</term>
<term>Random forest models</term>
<term>Random forests</term>
<term>Same direction</term>
<term>Same group</term>
<term>Score range</term>
<term>Separate group</term>
<term>Single hydrophone</term>
<term>Single observer</term>
<term>Single whistles</term>
<term>Slow travel</term>
<term>Small boats</term>
<term>Small groups</term>
<term>Social behavior</term>
<term>Social interactions</term>
<term>Soldevilla</term>
<term>Sousa chinensis</term>
<term>Southern california bight</term>
<term>Spacing</term>
<term>Spacing data</term>
<term>Spinner</term>
<term>Stenella longirostris</term>
<term>Stomach contents</term>
<term>Surface activity</term>
<term>Surface behavior</term>
<term>Temporal scales</term>
<term>Time period</term>
<term>Total number</term>
<term>Travel behavior</term>
<term>Travel forage mill</term>
<term>Travel groups</term>
<term>Travel speed</term>
<term>Tursiops truncatus</term>
<term>Unpublished data</term>
<term>Variable direction</term>
<term>Vocal communication</term>
<term>Vocalization</term>
<term>Vocalization data</term>
<term>Vocalization patterns</term>
<term>Water line</term>
<term>Whale</term>
<term>Whistle</term>
<term>Whistle bout bandwidth</term>
<term>Whistle bout duration</term>
<term>Whistle bouts</term>
<term>Whistle characteristics</term>
<term>White water</term>
<term>Wursig</term>
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<front>
<div type="abstract" xml:lang="en">Correlations between surface behavior and concurrent underwater vocalizations were modeled for common dolphins (Delphinus spp.) in the Southern California Bight (SCB) over multiple field seasons. Clicks, pulsed calls, and whistles were examined, with a total of 50 call features identified. Call features were used to classify behavior using random forest decision trees, with rates of correct classification reaching 80.6% for fast travel, 84.6% for moderate travel, 59.8% for slow travel, and 58% for foraging behavior. Common dolphins spent most of their time traveling. The highest number of clicks, pulsed calls, and complex whistles were produced during fast travel. In contrast, during foraging there were few pulsed calls and whistles produced, and the whistles were simple with narrow bandwidths and few harmonics. Behavior and vocalization patterns suggest nocturnal foraging in offshore waters as the primary feeding strategy. Group size and spacing were strongly correlated with behavior and rates of calling, with higher call rates in dispersed traveling groups and lower call rates in loosely aggregated foraging groups. These results demonstrate that surface behavior can be classified using vocalization data, which builds the framework for behavioral studies of common dolphins using passive acoustic monitoring techniques.</div>
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