Banca de DEFESA: LETICIA AURORA COELHO DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LETICIA AURORA COELHO DA SILVA
DATA : 25/02/2019
HORA: 09:00
LOCAL: Sala Darwin
TÍTULO:

Comparison of cetacean detection during seismic surveys activities by three methods and from two monitoring platforms.

PALAVRAS-CHAVES:

Toothed whales; Acoustic pollution; Acoustic masking

PÁGINAS: 55
GRANDE ÁREA: Ciências Humanas
ÁREA: Psicologia
RESUMO:

One of the most intense anthropogenic noises occurring in the oceans is caused by the explosions of air guns during seismic surveys. The highest energy levels produced by seismic surveys overlap the sound frequencies emitted by baleen whales, and most of their noise emissions are within the toothed whale's auditory range. As more research are being done and more information about the effects of seismic surveys on the marine biota has been investigated, Brazilian research should continue to contribute with scientific knowledge to improve the mitigation measures of these effects in our country. The first step to mitigate the effects of seismic surveys on cetaceans is the detection of these animals during this activity. The detection of cetaceans involves monitoring the oceans in two ways: a) visual monitoring; and b) passive acoustic monitoring (PAM). Were used as independent platforms of simultaneous monitoring, the traditional monitoring platform (TMP), the seismic vessel itself; and the alternative monitoring platform (AMP), the support vessel supporting the seismic vessel. The main goal of this study is to analyze the acoustic detections recorded during seismic survey activities, by the comparison of the methods of sampling effort (MSE) punctual and continuous, and between the TMP and AMP; and, b) to compare the visual detections recorded between TMP and AMP. The specific objectives of this research are: a) to verify if there is difference in the number of acoustic detections per hour, between the punctual MSE, in comparison to the continuous MSE; b) to verify if there is a difference in the highest values detected per hour of acoustic sampling effort between TMP and AMP; and, c) to verify if there is a difference in the number of visual detections recorded by the TMP in comparison with the AMP. A significant difference was found in the acoustic detection between the MSE and in the acoustic detections of higher values between the platforms, with the addition of the unidentified signal. But no significant difference was found between the acoustic detections of higher values between the platforms, without the unidentified signal and in the number of visual detections between the platforms. Here, we demonstrated the potential for cetacean detection that different methods and platforms have. Further research should be done prioritizing the standardization and union of cetacean monitoring and detection methods, so that we can detect them more efficiently and better identify the effects of seismic prospecting in each group.

MEMBROS DA BANCA:
Externo à Instituição - ANDRÉ SILVA BARRETO - UVI
Externo à Instituição - CRISTIANO LEITE PARENTE
Presidente - 1863735 - RENATA SANTORO DE SOUSA LIMA MOBLEY