[MARMAM] New publication: Comparison of common bottlenose dolphin whistles in tropical waters (RIO et al., 2024)
Dear MarMam community, On behalf of my co-authors, I am pleased to share our latest article published in Marine Mammal Science: Comparison of common bottlenose dolphin whistles in tropical waters (Raul Rio, Daniel Romero-Mujalli, Sergio Cobarrubia-Russo, Hiram Rosales Nanduca, Flávio Medeiros Vieites, Thales Renato Ochotorena de Freitas, Lilian Sander Hoffmann) The paper can be found here: https://doi.org/10./mms.13122 If you're interested in reading the full article, please email me for a copy of the pdf: oceansoundsecr...@gmail.com (Raul Rio) The present study about geographic variation in tropical common bottlenose dolphin whistles showed variation between oceanic (Revillagigedo Archipelago, Pacific Ocean, Mexico; Saint Peter and Saint Paul Archipelago, mid-equatorial North Atlantic Ocean, Brazil) and coastal populations (the western Coast of Aragua, South Caribbean, Venezuela). Environmental acoustic adaptations, variances in vessel traffic among locations, and other possible causes associated with the geographic differences are discussed. The current study is the first step towards providing an overview of geographic whistle variation among the herein assessed locations. Future studies should focus on a fine-grained comparison of variations between whistle types, measure ambient noise levels in each location, and incorporate acoustic propagation modeling. Happy reading! Raul RioUniversidade Federal de Juiz de Fora - UFJF ONG Som de Oceano (Ocean Sound NGO) http://www.somdeoceano.com.br http://www.oceansound.org Linktree: https://linktr.ee/somdeoceano Instagram: https://www.instagram.com/somdeoceano/ YouTube: https://youtube.com/@somdeoceano Em quarta-feira, 8 de novembro de 2023 às 07:39:57 BRT, Raul Rio Ribeiro escreveu: Dear MARMAM readers, We are pleased to announce the publication of our new study entitled "First identification of stereotyped whistle contour types by Pseudorca crassidens" in Marine Mammal Science (Rio & Hiram, 2023). It may be accessed via the link: https://doi.org/10./mms.13087 Best regards, Raul RioUniversidade Federal de Juiz de Fora - UFJFONG Som de Oceano (Ocean Sound NGO)http://www.oceansound.org Site: https://www.oceansound.org/ Linktree: https://linktr.ee/oceansound.org Instagram: https://www.instagram.com/oceansoundorg/ YouTube: https://www.youtube.com/@oceansound ___ MARMAM mailing list MARMAM@lists.uvic.ca https://lists.uvic.ca/mailman/listinfo/marmam
[MARMAM] New publication: First identification of stereotyped whistle contour types by Pseudorca crassidens (Raul Rio & Hiram Rosales-Nanduca)
Dear MarMam community, On behalf of my co-authors, I am pleased to share our latest article published in Marine Mammal Science: First identification of stereotyped whistle contour types by Pseudorca crassidens (Raul Rio & Hiram Rosales-Nanduca) The paper can be found here: https://doi.org/10./mms.13087 Dolphins use personalized vocalizations, known as signature whistles (SW), to transmit the senders' identity to their surroundings. The present study is the first to provide acoustic evidence that false killer whales (Pseudorca crassidens) produce stereotyped whistle contour types. Acoustic recordings were obtained opportunistically from a false killer whale group, living seasonally in Mexican Pacific waters. Out of the 410 whistles extracted, 69.0% (283) were classified as stereotyped whistles (STW), 44.9% of them (127) met the SIGID bout criteria for SW. We suggest that at least one third (31.0%) of coastal false killer whale whistles produced by free-ranging animals from La Paz Bay, Gulf of California, could be possible signature whistles (PSW). The visual similarity in value judgment by naïve external observers has confirmed the adopted PSW classification type, with perfect overlap and suggested short-term whistle stability. Research about the individual recognition skills of these animals could provide valuable information for the yet limited understanding of this species' social structure in La Paz Bay, especially because recent genetic evidence shows unique haplotypes for this population. Happy reading! Raul RioUniversidade Federal de Juiz de Fora - UFJFONG Ocean Soundhttp://www.oceansound.org Site: https://www.oceansound.org/ Linktree: https://linktr.ee/oceansound.org Instagram: https://www.instagram.com/oceansoundorg/ YouTube: https://www.youtube.com/@oceansoundFacebook: https://www.facebook.com/oceansound.org Em quarta-feira, 8 de novembro de 2023 08:39:57 GMT-2, Raul Rio Ribeiro escreveu: Dear MarMam community,, We are pleased to announce the publication of our new study entitled "First identification of stereotyped whistle contour types by Pseudorca crassidens" in Marine Mammal Science (Rio & Hiram, 2023). It may be accessed via the link: https://doi.org/10./mms.13087 Best regards, Raul RioUniversidade Federal de Juiz de Fora - UFJFONG Som de Oceano (Ocean Sound NGO)http://www.oceansound.org Site: https://www.oceansound.org/ Linktree: https://linktr.ee/oceansound.org Instagram: https://www.instagram.com/oceansoundorg/ YouTube: https://www.youtube.com/@oceansound ___ MARMAM mailing list MARMAM@lists.uvic.ca https://lists.uvic.ca/mailman/listinfo/marmam
[MARMAM] New publication: "First acoustic evidence of signature whistle production by spinner dolphins (Stenella longirostris)" in Anim Cogn (Rio, 2023)
Dear MARMAM readers, I am pleased to announce the publication of our new study entitled "First acoustic evidence of signature whistle production by spinner dolphins (Stenella longirostris)" in Anim Cogn (2023). https://doi.org/10.1007/s10071-023-01824-8 It may be accessed via the link below: First acoustic evidence of signature whistle production by spinner dolphins (Stenella longirostris) - Animal Cognition | | | First acoustic evidence of signature wh... | Raul Rio ABSTRACT: 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. Best regards, Raul RioUniversidade Federal de Juiz de Fora - UFJFONG Ocean Soundhttp://www.oceansound.org Site: https://www.oceansound.org/ Linktree: https://linktr.ee/oceansound.org Instagram: https://www.instagram.com/oceansoundorg/ YouTube: https://www.youtube.com/@oceansoundFacebook: https://www.facebook.com/oceansound.org ___ MARMAM mailing list MARMAM@lists.uvic.ca https://lists.uvic.ca/mailman/listinfo/marmam
[MARMAM] New publication: Acoustic recording of false killer whale (Pseudorca crassidens) from Mexico (L)” in The Journal of the Acoustical Society of America
Dear MARMAM readers, I am pleased to announce the publication of our new study entitled "Acoustic recording of false killer whale (Pseudorca crassidens) from Mexico (L)” in The Journal of the Acoustical Society of America (Vol.153, Issue 4). It may be accessed via the link below: Acoustic recording of false killer whale (Pseudorca crassidens) from Mexico (L) DOI: 10.1121/10.0017726 Raul Rio ABSTRACT: This study collected acoustic information on false killer whales (Pseudorca crassidens) in Mexican waters, close to Roca Partida Island, Revillagigedo Archipelago. In total, 321 whistles were collected after we found a group with at least ten individuals. The high prevalence of ascending contour types [upsweep (type I): 42.99%] contradicted the idea that false killer whales mostly produce constant whistles. Lack of well-established reproducibility criteria for whistle type categorization among studies may have generated results different from those expected for signal modu- lation. Future acoustic and ecological studies should be conducted to help clarify these findings and expand the lim- ited knowledge about this species. Best regards, Raul RioUniversidade Federal de Juiz de Fora - UFJFONG Ocean Soundhttp://www.oceansound.org Site: https://www.oceansound.org/ Linktree: https://linktr.ee/oceansound.org Instagram: https://www.instagram.com/oceansoundorg/ YouTube: https://www.youtube.com/@oceansoundFacebook: https://www.facebook.com/oceansound.org ___ MARMAM mailing list MARMAM@lists.uvic.ca https://lists.uvic.ca/mailman/listinfo/marmam
