Banca de DEFESA: ISRAEL DE SÁ MACIEL

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ISRAEL DE SÁ MACIEL
DATA : 10/02/2020
HORA: 14:00
LOCAL: ICBS
TÍTULO:

Acoustic ecology of Guiana dolphin (Sotalia guianensis) in Sepetiba bay and Ilha Grande bay

PALAVRAS-CHAVES:

bioacoustic; soundscape ecology; vocal stability; anthropic impact

PÁGINAS: 153
GRANDE ÁREA: Ciências Biológicas
ÁREA: Zoologia
SUBÁREA: Comportamento Animal
RESUMO:

Acoustic repertoires may change in temporal and spatial scale, and may present
changes influenced by the creation of new social alliances, changes in soudscape or
geographical. Thus, the goal of this study is to evaluate the spatial and temporal changes
in the acoustic repertoire of the Guiana dolphin (Sotalia guianensis). This study is based
on a dataset of acoustic recordings in Sepetiba Bay from 1998 to 2002, new recordings
from 2015 to 2018 in Sepetiba Bay and in 2017 and 2018 in Ilha Grande Bay. Temporally,
changes in the acoustic parameters of whistles, frequency contours and signature whistles
were compared. Spatially, frequency contours were compared between populations of
Sepetiba and Ilha Grande bays. Still in spatial scale, the influence of anthropogenic noise
and environmental variables on the acoustic parameters and occurrence was modeled.
Temporally, the Guiana dolphin's repertoire may be stable for about 20 years. However,
over time, there was a reduction in the diversity of whistles, a reduction in the duration
of emissions, a reduction of over 90% in whistle rate, and an increase in the maximum
and minimum frequencies. In the spatial comparison between bays we identified 180
frequency contours in the population of Ilha Grande Bay and 53 in the population of
Sepetiba Bay. The geographical variations observed are not only in the types of whistles
emitted, but also in the diversity of the repertoires and their low sharing. Modeling
indicated that Guiana dolphins vocalize more, with longer and more complex whistles in
less noisy habitats. However, there is no change in the pattern of occurrence regarding
noise levels, but due to environmental variables. Between bays it is still unclear the
reasons that promote differences in acoustic diversity. However, both the temporal
variation and the predicted by the spatial scale models indicate that the Guiana dolphin
presents an acoustic behavior response similar to the anthropogenic noise level. However,
environmental variables were more important than noise levels for occurrence.

MEMBROS DA BANCA:
Externa à Instituição - RENATA SANTORO DE SOUSA LIMA MOBLEY
Externa à Instituição - CAMILA DOMIT
Interno - 387200 - FRANCISCO GERSON ARAUJO
Interno - 387289 - ILDEMAR FERREIRA
Externa à Instituição - LUCIANA DUARTE DE FIGUEIREDO
Interno - 108.545.857-10 - RODRIGO HIPÓLITO TARDIN OLIVEIRA - UERJ