2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/24/2021  |   8:30 AM - 10:30 AM   |  SOUNDSCAPE OF A DAMMED RIVER IN NORTHEAST OF BRAZIL   |  Virtual Platform

SOUNDSCAPE OF A DAMMED RIVER IN NORTHEAST OF BRAZIL

The soundscape was evaluated using the passive acoustic method. Underwater recordings were made in 14 locations between dam and the mouth of São Francisco River (240 km) in December 2019 and 2020, detected different types of biological and anthropogenic sounds. The sounds production of at least 2 types of crustaceans and 18 types of fish. The sounds made by shrimp, which occurred mainly in the late afternoon and early morning. The average values of the high and low frequencies were 8.4 ± 0.8 kHz and 3.7 ± 0.3 kHz respectively, and the central frequency of 5.5 ± 0.09 kHz. In regions near to the estuary, two others types of shrimp sounds were identified with frequency between 1 and 15 kHz. Fish sounds presented frequencies between 0.2 and 1.5 kHz. The acoustic landscape presented characteristics similar to estuarine ecosystems 10 km from the mouth of river. Anthropogenic noises were also detected from different vessels with a wide frequency band (between 0.2 and 15 kHz), which can mask biological sounds. Passive acoustics tool can be used as a tool for monitoring biological and anthropic sounds, as well river and estuary environments conditions.

  • Monitoring
  • Biodiversity
  • Anthropogenic

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Presenters/Authors

Alfredo Mojica (), Federal University of Alagoas, alfredo.mojica@penedo.ufal.br;


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