First acoustic evidence of signature whistle production by spinner dolphins (Stenella longirostris).
Acoustic repertoire
Fernando de Noronha
Signature whistles
Spinner dolphin
Stenella longirostris
Whistles
Journal
Animal cognition
ISSN: 1435-9456
Titre abrégé: Anim Cogn
Pays: Germany
ID NLM: 9814573
Informations de publication
Date de publication:
07 Sep 2023
07 Sep 2023
Historique:
received:
03
03
2023
accepted:
29
08
2023
revised:
23
08
2023
medline:
7
9
2023
pubmed:
7
9
2023
entrez:
7
9
2023
Statut:
aheadofprint
Résumé
A dolphin's signature whistle (SW) is a distinctive acoustic signal, issued in a bout pattern of unique frequency modulation contours; it allows individuals belonging to a given group to recognize each other and, consequently, to maintain contact and cohesion. The current study is the first scientific evidence that spinner dolphins (Stenella longirostris) produce SWs. Acoustic data were recorded at a shallow rest bay called "Biboca", in Fernando de Noronha Archipelago, Brazil. In total, 1902 whistles were analyzed; 40% (753/1,902) of them were classified as stereotyped whistles (STW). Based on the SIGID method, 63% (472/753) of all STWs were identified as SWs; subsequently, they were categorized into one of 18 SW types. SWs accounted for 25% (472/1,902) of the acoustic repertoire. External observers have shown near perfect agreement to classify whistles into the adopted SW categorization. Most acoustic and temporal variables measured for SWs showed mean values similar to those recorded in other studies with spinner dolphins, whose authors did not differentiate SWs from non-SWs. Principal component analysis has explained 78% of total SW variance, and it emphasized the relevance of shape/contour and frequency variables to SW variance. This scientific discovery helps improving bioacoustics knowledge about the investigated species. Future studies to be conducted in Fernando de Noronha Archipelago should focus on continuous investigations about SW development and use by S. longirostris, expanding individuals' identifications (Photo ID and SW Noronha Catalog), assessing long-term whistle stability and emission rates, and making mother-offspring comparisons with sex-based differences.
Identifiants
pubmed: 37676587
doi: 10.1007/s10071-023-01824-8
pii: 10.1007/s10071-023-01824-8
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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