How can passive acoustic monitoring help?
Passive acoustic monitoring in the aquatic environment refers to the use of underwater microphones (e.g., hydrophones) to detect and monitor biotic and abiotic sounds in the ocean. This type of monitoring can serve as a useful, non-extractive, and cost-effective tool that complements traditional survey methods (e.g., aerial, visual, trawl, telemetry). Recording devices such as marine autonomous recording units and SoundTraps can be deployed for months at a time. They gather data in conditions that would otherwise limit survey effort. The data gathered from these recorders provides scientists with information on the acoustic presence of a species of interest with known species-specific signals. Arrays of recorders can allow data to be gathered that track the spatial presence of a species and possibly fine-scale movements.