Samoilys, Melita, Roche, Ronan C, Gudka, Mishal, Thouless, Clare, Obura, David, Rowlands, Steve, Mbugua, James and Osuka, Kennedy
(2025)
Fish as Indicators of Coral Reef Ecosystem Status.
[Preprint]
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Abstract
Monitoring coral reef health is essential for managing biodiversity and ecosystem services in the face of accelerating environmental change. Here, we assess whether aggregated reef fish indicators at the community and family level can reflect variation in coral reef benthic condition, structural complexity, and human pressure across 77 sites in the western and central Indian Ocean. Our findings reveal that fish indicators exhibit variable sensitivity and specificity to these ecological gradients. Human gravity was the strongest and most consistent predictor across both community-level and family-level metrics, particularly for biomass and length-based indicators. Mean community trophic level, grouper (Epinephelidae) and butterflyfish (Chaetodontidae) biomass, and surgeonfish (Acanthuridae) abundance were responsive to benthic condition, while grouper length was the most specific indicator of reef structural complexity. In contrast, parrotfish (Scarinae) indicators were not significantly associated with benthic condition, challenging the assumption that they are tightly linked to reef health or degradation in this region. These results underscore the need for careful selection of fish indicators of coral reef status and demonstrate how family-level indicators can provide specificity in response to pressures that is not captured within aggregate community indicators. We recommend that additional family-level fish indicators of coral reef ecosystem integrity and function be considered within Red List of Ecosystems assessments, and that targeted family-level indicators, such as butterflyfish and grouper biomass for benthic status, grouper length for rugosity and surgeonfish abundance for benthic status, complement existing reef benthic monitoring within global coral reef reporting frameworks such as the GCRMN.
| Item Type: | Preprint |
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| Divisions: | Faculty of Science and Engineering Faculty of Science and Engineering > School of Environmental Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 17 Jun 2025 15:55 |
| Last Modified: | 17 Jun 2025 15:55 |
| DOI: | 10.2139/ssrn.5251429 |
| Related Websites: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3193278 |
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