Dear Marine Mammal Community, we are pleased to share our recent open access publication: Pace D.S., Tumino C., Silvestri M., Giacomini G., Pedrazzi G., Pavan G., Papale E., Ceraulo M., Buscaino G., Ardizzone G. (2022). Bray-call sequences in the Mediterranean bottlenose dolphin (Tursiops truncatus) acoustic repertoire. Biology 11(2), 367. https://www.mdpi.com/2079-7737/11/3/367 Abstract Acoustic sequences are commonly observed in many animal taxa. The vast vocal repertoire of bottlenose dolphins (Tursiops truncatus) also includes sequences of multi-unit rhythmic signals called bray-call which are still poorly documented, both functionally and geographically. This study aimed to (1) describe, classify and characterize series of bray-call recorded in two sites of the Mediterranean basin (Rome - Tyrrhenian Sea and Mazara del Vallo - Strait of Sicily) and (2) investigate for possible geographic differences. The acoustic analysis identified 13 different sequence types, only two detected in both study areas. The Sørensen–Dice index revealed a low degree of similarity between the sequence repertoire of the two bottlenose dolphin populations, with the Tyrrhenian being more diversified and complex than the Sicilian one. The acoustic parameters showed variability between the study areas as well. Different variants of the main acoustic elements composing the bray-call sequences were detected in the Tyrrhenian Sea only. The Markov-chain model demonstrated that the transition probability between acoustic elements is not uniform, with specific combinations of elements having a higher probability of occurrence. These new findings on bottlenose dolphin bray-call sequences highlight the structural complexity of these vocalizations, suggesting to address future research on the context of emissions and the possible function(s) of such acoustic arrangements Best Daniela -- Daniela Silvia Pace, PhD Department of Environmental Biology Marine Ecology Lab Sapienza University of Rome Viale dell’Università 32 00185 Rome, Italy mail: danielasilvia.pace@uniroma1.it mobile: +39 346 1039652 office: +39 06 4991 4763 skype: lagenorinco Orcid ID: https://orcid.org/0000-0001-5121-7080 [image: Risultati immagini per logo sapienza]