Banca de QUALIFICAÇÃO: CIBELE CASTRO MONTEIRO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : CIBELE CASTRO MONTEIRO
DATA : 30/10/2018
HORA: 14:30
LOCAL: Sala de Reuniões do CB
TÍTULO:

Bioacoustic study of Eretmochelys imbricata

(LINNAEUS, 1766) at Barreira do Inferno – RN

PALAVRAS-CHAVES:

Testudineae, bioacoustic, communication, TAMAR, hawksbill

PÁGINAS: 62
GRANDE ÁREA: Ciências Biológicas
ÁREA: Biofísica
SUBÁREA: Biofísica de Processos e Sistemas
RESUMO:

The Potiguar coast is one of the most important areas to the reproduction of the comb turtle (Eretmochelys imbricata), being the region with the highest density 

of spawning in the South Atlantic. Chelonium is mainly communicated through smell and sight, but studies have shown a promising potential in the use of 

acoustic communication in this group. The aim of this work was to identify acoustic emissions produced by embryos and turtle pups in the Barreira do 

Inferno, Parnamirim-RN. For data collection, the TASCAM DR-40 recorder and 96kHz sample rate were used. The research was submitted to the Biodiversity 

Information and Authorization System, in which license number 61977-1 was obtained. To date, 81 recordings of E. imbricata nests, with presence of eggs or 

eggs and pups, were analyzed. Spectral analysis of vocalizations was performed in RAVEN Pro 1.5 software (Cornell Lab of Ornithology, Ithaca, NY). The findings 

vary between pulsed and tonal sounds, most of them being found in nests with only eggs, in agreement with other results found in the literature. Four types of signs were 

found in nests. The type I signal (N = 126) consists of pulses of duration between 0.001 and 0.004s, and can reach up to 64 pulses in a row with a peak frequency between 375 

and 2625 Hz. Type II (N = 108) or a series of pulses, reaching up to 25, with a duration of 0.001s each pulse. The peak of frequency is between 1125 and 1350 Hz. Type III sound 

(N = 31) is formed by a single band, with low frequency modulation, having peak energy of 24.06dB and a duration between 0.004 and 0.096 s, being the longest found sounds. 

Type IV (N = 35) are tonal signals, with 2 to 5 harmonics present and may have up to 6 inflection points, with a duration between 0.003 and 0.032 s. Some sounds have the 

2nd or 3rd harmonics with a higher amount of energy than the 1st, varying between 49 and 65 dB and having an inband power with an average of 28.95 dB. The pulsed sounds 

were the most frequent recordings found in the Eretmochelys imbricata nests, type I and II being the most common signs, present in both nests that had only eggs, and in nests that 

already contained pups. Tonal sounds such as types III and IV were found mainly when pups were already present outside the eggs. The window used was Hamming type, with FFT size 

256 for types I and II and 512 for types III and IV. The sound emissions were compared to the sounds of other chelonians such as Chelodina oblonga, Podocnemis expansa and Dermochelys 

coriacea. More samples should be analyzed in order to confirm the existence of the sound patterns detected. The work is carried out in partnership with the TAMAR project and presents promising results 

on the acoustic repertoire of E. imbricata pups.

MEMBROS DA BANCA:
Presidente - 1379465 - GILBERTO CORSO
Interno - 2985070 - JONAS IVAN NOBRE OLIVEIRA
Externo ao Programa - 1863735 - RENATA SANTORO DE SOUSA LIMA MOBLEY
Externo ao Programa - 1672446 - SIMONE ALMEIDA GAVILAN