| 研究実績の概要 |
Soundscapes, which are composited by sounds of biological, environmental, and anthropogenic sources, have been considered as a remote sensing platform to monitor marine biodiversity and anthropogenic activities. This study aims to apply marine soundscapes in the evaluation of marine ecosystem health. Our goal is to facilitate the assessment of the spatial-temporal dynamics of marine ecosystems via an international monitoring network of marine soundscapes. There are three primary tasks in this project: (1)Developing open tools of soundscape information retrieval (SIR) to separate biotic and abiotic sounds from marine soundscapes. (2)Evaluating the feasibility of soundscape monitoring in deep-sea environments. (3)Establishing an open science platform of marine soundscapes.
During the first year, we developed a MATLAB-based toolbox of soundscape information retrieval and published the source codes. The toolbox was applied in the analysis of long-duration recordings to observe the ecosystem dynamics of a continental shelf environment off northeastern Taiwan. The preliminary result suggests that the separation of biotic and abiotic sounds is feasible. Even without labeled data for model training, our approach can achieve effective blind source separation according to the source-specific periodicity pattern. Furthermore, two deep-sea audio recorders that can be deployed at 2000 m water depth were built to assist in the soundscape-based ecosystem monitoring in deep-sea environments.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The first-year project applied for an extension due to the delayed progress of developing deep-sea audio recorders. After the budget extension, we have successfully finished the recorder development and ran several field tests. The open toolbox of soundscape information retrieval has now applied in many ecoacoustics projects in Japan and other countries. Therefore, we consider that the progress of this project meets our original expectations.
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| 今後の研究の推進方策 |
The second-year project aims to collaborate with international researchers from Japan, Taiwan, Hong Kong, and the Philippines. To facilitate the applications of soundscape information retrieval, we will publish online tutorials for researchers and students. We will also establish Ocean Biodiversity Listening Project to collect underwater sounds from algal reefs, river estuaries, coral reefs, continental shelves, hydrothermal vents. By doing so, we will characterize the ecosystem-specific soundscapes and investigate how anthropogenic activities interfere with marine soundscapes.
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