AI Article Synopsis
- Back-reef habitats serve as essential nurseries for coral reef fishes and are vulnerable to environmental changes.
- Passive Acoustic Monitoring (PAM) was used to study fish sound diversity and activity patterns at Makogai Island, Fiji, over a four-day period.
- Findings revealed that fish sound abundance varied by bay and time, with higher biodiversity detected acoustically at dawn and night in bays with greater visual diversity, underscoring PAM's value in monitoring these ecosystems.
Article Abstract
Back-reef habitats are important and fragile transition zones acting as nurseries for many coral reef fishes. In this framework, Passive Acoustic Monitoring (PAM) can be an important tool to evaluate the diversity and dynamics of sonic fish community. Here, we investigated the diversity, spatial and diel dynamics of fish sounds in back-reef habitats at Makogai Island in Fiji, South Pacific. Synchronized underwater recorders were deployed in 4 bays collecting data for about 4 days. The abundance of 12 different sub-categories of fish sounds were quantified. Signals were acoustically characterized and the level of discrimination between the sub-categories was evaluated by Discrimination Function Analysis. Generalized Additive Models showed that the abundance of signals was related to the bay and the hour. Moreover, the Shannon Diversity and Equitability Indices were calculated using acoustic and visual census data to describe fish biodiversity of each bay. The two bays with greater biodiversity based on visual census also showed a greater acoustic diversity at dawn and night. Our results highlight the importance of PAM to reveal the diversity of fish community in back-reef habitats, providing a baseline to understand future changes in these crucial environments.
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| http://dx.doi.org/10.1016/j.marenvres.2024.106819 | DOI Listing |
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Article Synopsis
- Back-reef habitats serve as essential nurseries for coral reef fishes and are vulnerable to environmental changes.
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- Findings revealed that fish sound abundance varied by bay and time, with higher biodiversity detected acoustically at dawn and night in bays with greater visual diversity, underscoring PAM's value in monitoring these ecosystems.
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