Banca de DEFESA: EDUARDO CABRAL CASADO LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : EDUARDO CABRAL CASADO LIMA
DATA : 22/02/2019
HORA: 10:00
LOCAL: PPGEA, Anfiteatro B
TÍTULO:

Characterization of sound emissions of humpback whales, Megaptera novaeangliae (Borowski, 1781) in the Abrolhos region from 2005 to 2016

PALAVRAS-CHAVES:

Bioacustic, song, Megaptera novaeangliae

PÁGINAS: 77
GRANDE ÁREA: Ciências Biológicas
ÁREA: Zoologia
SUBÁREA: Comportamento Animal
RESUMO:

The general objective of the study was to analyze the variation in the structure of the humpback whale song (Megaptera novaeangliae) in the Bank of Abrolhos region, during the period from 2005 to 2016, describing the hierarchical level of Phrases and Themes throughout this period. Records of vocalizations of whales were conducted by the Humpback Whale Institute team (IBJ), between 2005 and 2016, in the region of Abrolhos, Bahia State, Brazil. The hierarchical level of Phrases and Themes was read from the Raven 1.5 software, evaluating five parameters for sentences: (1) Low frequency (Hz); (2) High frequency (Hz); (3) Delta Frequency (Hz); (4)Peak Frequency (Hz); (5) Delta time (s). The mean, standard deviation (SD), minimum value (vmin) and maximum value (Vmax) of each parameter were calculated in each sentence. Variance analyses (ANOVA) were performed and Tukey's test was applied only in sentences that occurred in two years or more to verify if there were significant variations between the years of study. With the value of the Post Hoc test > 0.05 not representing significant variation a year. At the hierarchical level of themes, the units that comprised the best visualization sentences were selected to analyze the measurement of two parameters measured in the Raven1.5 software: (1) dominant frequency (Hz) and (2) duration of time (s). We analyzed 6 hours, 07 minutes and 04 seconds with a 9-year scope for the study, being, only the year 2010, presenting many noises in the samples, therefore not used in the analyses. The results show a quantity of 16 phrases and 13 themes
throughout the years of study. It is evidenced, therefore, that the song of the Humpte whale is quite variable in relation to its structures, Units, Phrases and Themes, not presenting a fixed pattern in its corner. Phrases and themes that were found in the present work, were also found around the world. An example is the topic 5, composed of sentence 6, which in 2006 is very similar to that found in Madagascar in the same year. This fact may suggest that there is a learning transmission happening in the feeding areas may be occurring in the feeding area in Antarctica. The follow-up over the years will allow to evaluate the changes occurring in the reproductive seasons, assisting in the understanding of the evolution of the themes and phrases, reinforcing the idea that there may be similarities between them with populations from other places to around the
world.

MEMBROS DA BANCA:
Presidente - 387200 - FRANCISCO GERSON ARAUJO
Interno - 387289 - ILDEMAR FERREIRA
Externo à Instituição - LUCIANA DUARTE DE FIGUEIREDO
Externo à Instituição - MARIANA DE ASSIS ESPÉCIE
Interno - 108.545.857-10 - RODRIGO HIPÓLITO TARDIN OLIVEIRA - UERJ
Interno - 387371 - SHEILA MARINO SIMAO