01971nas a2200193   4500008004100000245010700041210006900148260001600217520132300233100002301556700002301579700002101602700002401623700002001647700002001667700002701687700002001714856004301734       2018                        eng d00aWhistle variability of Guiana dolphins in South America: Latitudinal variation or acoustic adaptation?0 aWhistle variability of Guiana dolphins in South America Latitudi  cJun-12-20193 a<p>A previous comparison of whistles using data sampled at 48 kHz suggested that certain frequency parameters vary along a latitudinal gradient. This geographical pattern may be biased because whistles sampled at higher frequencies could potentially have very different frequency contents. The current study compared the acoustic parameters of Guiana dolphin (Sotalia guianensis) whistles recorded at a higher sampling rate (96 kHz) and from groups occupying two never before sampled sites, Benevente Bay, Esp&iacute;rito Santo, Brazil, and Formosa Bay, Rio Grande do Norte, Brazil, with recordings of other populations in South America. By only considering data sampled at a rate of at least 96 kHz, we aimed to detect differences in whistles across locations. Contrary to previous findings, our analyses do not indicate any clear separation between northern and southern populations based on whistles, and do not corroborate the hypothesis of latitudinal acoustic variation in this species. The variation in Guiana dolphin whistle parameters found here appears to be influenced by latitude to some extent, but several other factors, including sampling method, environmental fluctuations, and social influence on vocal learning, may be confounding the detection of a geographic pattern in these whistle samples.</p>
1 aLopes, Nara, Pavan1 aReis, Sarah, Stutz1 aMamede, Natália1 aReis, Suzana, Stutz1 aToledo, Gustavo1 aCorso, Gilberto1 aSousa-lima, Renata, S.1 aAndriolo, Artur  uhttp://doi.wiley.com/10.1111/mms.12572