[MARMAM] New publication - The Acoustic Repertoire of Bottlenose Dolphins (Tursiops truncatus) in the Cres-Lošinj Archipelago (Croatia): Site Dependent Diel and Seasonal Changes

Raffaela Falkner raffaela.falkner at googlemail.com
Fri Jun 30 08:50:13 PDT 2023


Dear MARMAM community,

We are  pleased to announce the publication of our recent article titled:
The Acoustic Repertoire of Bottlenose Dolphins (*Tursiops truncatus*) in
the Cres-Lošinj Archipelago (Croatia): Site Dependent Diel and Seasonal
Changes

Falkner R, Picciulin M, Pleslić G, Rako-Gospić N. The Acoustic Repertoire
of Bottlenose Dolphins (*Tursiops truncatus*) in the Cres-Lošinj
Archipelago (Croatia): Site Dependent Diel and Seasonal Changes. *Diversity*.
2023; 15(6):787. https://doi.org/10.3390/d15060787

*Abstract:* Describing the acoustic repertoire of cetaceans is necessary to
understand the functionality of their sounds and the effect anthropogenic
pressures have on animals living in a marine environment. This study
provides a description of the acoustic repertoire of bottlenose
dolphins (*Tursiops
truncatus*) in the Cres-Lošinj archipelago based on continuous 24-h
recordings collected from two monitoring stations, both inside and outside
the Natura 2000 Site of Community Importance, during an 8-day period in
March/April 2020 and a 13-day period in July/August 2020. A total of 1008 h
were visually and aurally analyzed to identify vocalizations and
investigate diel and seasonal patterns in their parameters. Furthermore,
sound pressure levels were calculated for the low (63 Hz–2 kHz) and high (2
kHz–20 kHz) frequency range. Bottlenose dolphins in the Cres-Lošinj
archipelago were found to produce whistles, chirps, low frequency
narrow-band sounds, burst pulse sounds, and echolocation clicks showing
that dolphins are present at both monitoring stations, during both diel and
seasonal periods, in a comparable manner. This paper also provides evidence
that whistles, chirps, and low frequency narrow-band sounds change their
parameters in relation to the background noise in the area, that varies
according to diel and seasonal patterns. This suggests a vocal plasticity
in the species and a coping strategy to avoid masking of relevant acoustic
signals for the local population in the Cres-Lošinj archipelago.

Kind regards,
Raffaela Falkner
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