@article {53443,
	title = {Whistle variability of Guiana dolphins in South America: Latitudinal variation or acoustic adaptation?},
	journal = {Marine Mammal Science},
	year = {2018},
	month = {Jun-12-2019},
	abstract = {<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>
},
	doi = {10.1111/mms.12572},
	url = {http://doi.wiley.com/10.1111/mms.12572},
	author = {Lopes, Nara Pavan and Reis, Sarah Stutz and Mamede, Nat{\'a}lia and Reis, Suzana Stutz and Toledo, Gustavo and Corso, Gilberto and Sousa-lima, Renata S. and Andriolo, Artur}
}
@article {52749,
	title = {What do insects, anurans, birds, and mammals have to say about soundscape indices in a tropical savanna},
	journal = {Journal of Ecoacoustics},
	volume = {2},
	year = {2018},
	month = {Sep-18-20182245},
	pages = {PVH6YZ},
	abstract = {<p>The application of acoustic indices is incipient and still needs validation before it can reliably characterize soundscapes and monitor rapidly disappearing hot-spot areas as the Brazilian tropical savanna (Cerrado). Here we investigate which of six acoustic indices better correlate with the 24 h zoophony richness of insects, anurans, birds, and mammals. We sampled one minute every 30 minutes for seven days on three sites in Serra da Canastra National Park (Minas Gerais state, Brazil) and extracted the sonotype richness and six indices based on recordings with a bandwidth of up to 48 kHz. The Acoustic Diversity, Evenness, Entropy, and Normalized Difference Soundscape indices followed the temporal trends of the sonotype richness of insects and anurans. The Acoustic Complexity (ACI) and Bioacoustic (BIO) indices did not correlated with sonotype richness. ACI and BIO were influenced by sonic abundance and geophony. We emphasize the need to include insects and anurans on soundscape and acoustic ecology analyses and to avoid bias on avian fauna alone. We also suggest that future studies explore measures of sonic abundance and acoustic niche occupation of sonotypes to complement measures of zoophony richness and better understand what each faunal group is telling us about indices.</p>
},
	doi = {10.22261/JEA10.22261/JEA.PVH6YZ},
	url = {https://www.veruscript.com/api/files/veruscript_PVH6YZ.pdf},
	author = {Ferreira, Luane M. and Oliveira, Eliziane G. and Lopes, Lara C. and Brito, Marcos R. and Baumgarten, J{\'u}lio and Rodrigues, Fl{\'a}vio H. and Sousa-lima, Renata S.}
}
