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Differences in oscillatory whistles produced by spinner (Stenella longirostris) and pantropical spotted (Stenella attenuata) dolphins

Differences in oscillatory whistles produced by spinner (Stenella longirostris) and pantropical spotted (Stenella attenuata) dolphins
Differences in oscillatory whistles produced by spinner (Stenella longirostris) and pantropical spotted (Stenella attenuata) dolphins
Acoustic recordings of two closely related species, spinner dolphin (Stenella longirostris) and pantropical spotted dolphin (Stenella attenuata), were investigated from four different geographic locations: two in the Central Tropical Pacific, one in the Eastern Tropical Pacific and one in the Indian Ocean. The two delphinid species occur in tropical and warm temperate waters, with overlapping ranges. They produce very similar vocalizations, but at the same time their calls exhibit a certain degree of intraspecific variation among different geographic locations as has been observed in other delphinid species. Oscillatory whistles (whistles with at least two oscillations in their frequency contours) were identified and manually extracted from the recordings. Whistles with four or more maxima (oscillations) occurred only in spinner dolphins and they were present in all geographic regions investigated. In addition, the oscillatory whistles with two and three maxima were significantly more frequent in spinner than in spotted dolphins. The differences in oscillatory whistles for these two species seem to be consistent across study areas and therefore, could be used in addition to other whistle features to help distinguish between them
oscillatory whistles, whistle, global features, decision rule, dolphin, spinner dolphin, pantropical spotted dolphin, stenella longirostris, stenella attenuata, towed hydrophone array
0824-0469
1-15
Gruden, Pina
2d951d33-121b-4bce-9cf4-daa3935e2fb4
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Oswald, Julie
9896f8c2-8129-45e4-aef2-fbfbbd7ba457
Barkley, Yvonne
ad7dba85-6196-485c-8c8b-d0d4163ba81b
Cerchio, Salvatore
b0086021-72c7-4cc6-aa38-1e6b085495d6
Lammers, Marc
14d7e05a-e663-40e6-921a-f8f000351aec
Baumann-Pickering, Simone
4a19211e-bbca-4921-93cd-949713acbffc
Gruden, Pina
2d951d33-121b-4bce-9cf4-daa3935e2fb4
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Oswald, Julie
9896f8c2-8129-45e4-aef2-fbfbbd7ba457
Barkley, Yvonne
ad7dba85-6196-485c-8c8b-d0d4163ba81b
Cerchio, Salvatore
b0086021-72c7-4cc6-aa38-1e6b085495d6
Lammers, Marc
14d7e05a-e663-40e6-921a-f8f000351aec
Baumann-Pickering, Simone
4a19211e-bbca-4921-93cd-949713acbffc

Gruden, Pina, White, Paul and Oswald, Julie et al. (2015) Differences in oscillatory whistles produced by spinner (Stenella longirostris) and pantropical spotted (Stenella attenuata) dolphins. Marine Mammal Science, 1-15. (doi:10.1111/mms.12280).

Record type: Article

Abstract

Acoustic recordings of two closely related species, spinner dolphin (Stenella longirostris) and pantropical spotted dolphin (Stenella attenuata), were investigated from four different geographic locations: two in the Central Tropical Pacific, one in the Eastern Tropical Pacific and one in the Indian Ocean. The two delphinid species occur in tropical and warm temperate waters, with overlapping ranges. They produce very similar vocalizations, but at the same time their calls exhibit a certain degree of intraspecific variation among different geographic locations as has been observed in other delphinid species. Oscillatory whistles (whistles with at least two oscillations in their frequency contours) were identified and manually extracted from the recordings. Whistles with four or more maxima (oscillations) occurred only in spinner dolphins and they were present in all geographic regions investigated. In addition, the oscillatory whistles with two and three maxima were significantly more frequent in spinner than in spotted dolphins. The differences in oscillatory whistles for these two species seem to be consistent across study areas and therefore, could be used in addition to other whistle features to help distinguish between them

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More information

Published date: 24 October 2015
Keywords: oscillatory whistles, whistle, global features, decision rule, dolphin, spinner dolphin, pantropical spotted dolphin, stenella longirostris, stenella attenuata, towed hydrophone array
Organisations: Signal Processing & Control Grp

Identifiers

Local EPrints ID: 383559
URI: http://eprints.soton.ac.uk/id/eprint/383559
ISSN: 0824-0469
PURE UUID: 356fc2fc-11a1-4bce-b62f-58ba50886484
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713

Catalogue record

Date deposited: 16 Nov 2015 11:41
Last modified: 12 Jul 2024 01:33

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Contributors

Author: Pina Gruden
Author: Paul White ORCID iD
Author: Julie Oswald
Author: Yvonne Barkley
Author: Salvatore Cerchio
Author: Marc Lammers
Author: Simone Baumann-Pickering

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