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The Brazilian Equatorial Margin, an ecologically vital region, faces increasing anthropogenic noise from expanding petroleum exploration, including seismic surveys and vessel traffic. To establish a baseline soundscape and assess potential impacts, a passive acoustic monitoring program was implemented between the Amazon River mouth and São Marcos Bay, in compliance with the Brazilian environmental licensing framework. Data were collected from April 2024 to August 2025 using six moorings and drifting profilers across shelf and slope environments. Results identified distinct acoustic regimes and 144 biological sonotypes, primarily from Mysticetes and fish. A key finding was a clear seasonal pattern, where a marked increase in low-frequency tonal sounds after July aligned precisely with the known migratory period of baleen whales in the region. Presence–absence matrices revealed minimal site overlap, while species accumulation curves indicated unsaturated diversity, highlighting the need for continued monitoring. This study provides the first regional acoustic baseline and a methodological framework for assessing future anthropogenic impacts on this critical and challenging environment.

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Maritime Soundscape Monitoring of the Brazilian Equatorial Margin

  • 动态工具书词条

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

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  • Tiago C. Miranda,
  • André L. S. C. de Oliveira,
  • Lucas Nery,
  • Diana C. Freitas,
  • Luane S. Ferreira,
  • Efrain M. Pulgar-Pantaleon,
  • Pedro R. Vilar Neto,
  • Juliane S. Santos,
  • Rafael A. G. Lima,
  • Kaio M. O. Lopes,
  • Luisa F. Castro,
  • Lara C. Lopes,
  • Jaqueiuto Jorge,
  • Hugo Ferreira,
  • Renata S. Sousa-Lima

摘要

The Brazilian Equatorial Margin, an ecologically vital region, faces increasing anthropogenic noise from expanding petroleum exploration, including seismic surveys and vessel traffic. To establish a baseline soundscape and assess potential impacts, a passive acoustic monitoring program was implemented between the Amazon River mouth and São Marcos Bay, in compliance with the Brazilian environmental licensing framework. Data were collected from April 2024 to August 2025 using six moorings and drifting profilers across shelf and slope environments. Results identified distinct acoustic regimes and 144 biological sonotypes, primarily from Mysticetes and fish. A key finding was a clear seasonal pattern, where a marked increase in low-frequency tonal sounds after July aligned precisely with the known migratory period of baleen whales in the region. Presence–absence matrices revealed minimal site overlap, while species accumulation curves indicated unsaturated diversity, highlighting the need for continued monitoring. This study provides the first regional acoustic baseline and a methodological framework for assessing future anthropogenic impacts on this critical and challenging environment.