Whistle comparison of four delphinid species in Southeastern Brazil

Abstract

The present study evaluates variations in frequency and duration parameters of whistles of four dolphin species (Sotalia guianensis, Steno bredanensis, Stenella frontalis, and Tursiops truncatus), recorded in the Rio de Janeiro State Coast, Southeastern Brazil. A total of 487 whistles were analyzed. Acoustic parameters of the whistles were classified to species by discriminant function analysis. Overall classification score was 72.5%, with the highest classification score obtained for whistles of S. bredanensis and the lowest obtained for S. frontalis. Most differences were among S. bredanensis and S. guianensis, species that did not have their repertoires compared in other studies.

Review of Underwater and In-Air Sounds Emitted by Australian and Antarctic Marine Mammals

“…In Australian waters, they have been sighted off Barrow Island (WA), NT, QLD and NSW suggesting tropical-subtropical distribution [267]. They have been acoustically recorded in the Mediterranean [268], Central and Eastern Tropical Pacific and off Brazil [151,152,[269][270][271]. They emit FM sounds between 1.6 and 28.2 kHz (fundamental) of 0.03-2.2-s duration.…”

“…Common bottlenose dolphins inhabit tropical to temperate waters globally and occur around Australia in coastal as well as offshore waters [147,272]. Bottlenose dolphins have been acousti- [501] cally recorded in QLD, Australia [284], New Zealand [285], the Eastern Tropical Pacific [151,152], Hawaii [230], California [276,286], the Gulf of Mexico [163,253,276,287], the Caribbean [288], Central America [286,289], Brazil [270,290], Uruguay [291], Argentina [276], Namibia [292], the Northwest Atlantic [163,174], the Northeast Atlantic [282,293,294], Scotland and the UK [282,295,296], Mediterranean [156,293,[297][298][299], and Portugal [300]. Many recordings have also been taken of bottlenose dolphins in captivity (e.g.…”

“…Much of the literature focuses on whistles and geographic differences [151,152,156,163,174,253,270,276,286,[289][290][291][292][293][295][296][297][298]300,302]. Biphonic whistles have been reported [299].…”

Large groups of Atlantic spotted dolphin (Stenella frontalis) in a coastal bay from southeastern Brazil

“…While studies have been conducted on many aspects of the biology and ecology of this species (Azevedo et al, 2010; Bisi et al, 2013; Bittencourt, Barbosa, Santos‐Neto, et al, 2020; Caballero et al, 2013; Di Beneditto et al, 2001; Di Tullio et al, 2016; do Amaral et al, 2015; Dorneles et al, 2010; Lavandier et al, 2019; Leonel et al, 2012; Lima et al, 2016; Lopes et al, 2012; Méndez‐Fernandez et al, 2018, 2020; Moreno et al, 2005), information about habitat use, abundance, and behavior are scarce in SWAO. In southeastern Brazil cetaceans face several threats, such as chemical and noise pollution, habitat degradation, and bycatch (Bittencourt, Barbosa, Bisi, et al, 2020; Di Beneditto, 2003; Moreno et al, 2005; Oliveira‐Ferreira et al, 2021; Secchi et al, 2021), and Atlantic spotted dolphins are frequent in this region (Bisi et al, 2013; Moreno et al, 2005).…”

Bottlenose dolphins that forage with artisanal fishermen whistle differently

“…There is much variation in the structure of these sounds, both among species and within a species’ repertoire. The features of whistles allow for acoustic distinction between different dolphin species (Lima et al., ; Matthews, Rendell, Gordon, & Macdonald, ; Oswald, Barlow, & Norris, ; Rendell, Matthews, Gill, Gordon, & Macdonald, ; Steiner, ), and even between populations of the same species (Andrade et al., ; Deconto & Monteiro‐Filho, ; May‐Collado & Wartzok, ; Wang, Wursig, & Evans, ). Further, differences in whistle features within a population may reflect individual variation within these communication signals (e.g., signature whistles; Caldwell & Caldwell, ; Caldwell, Caldwell, & Tyack, ; Janik, Sayigh, & Wells, ; King & Janik, ) or reveal behavioural context specificity.…”