Assessment of microalgal diversity, community composition, and environmental drivers in coral reef and mangrove habitats of Sekotong coastal, Lombok Island
Astuti, S.P.; Affandi, M.; Soegianto, A. (2025). Assessment of microalgal diversity, community composition, and environmental drivers in coral reef and mangrove habitats of Sekotong coastal, Lombok Island, in: Peristiwady, T. et al. Proceedings of the 3rd International Seminar on Fish and Fisheries Sciences (ISFFS 2025). Advances in Biological Sciences Research, 51: pp. 83-100. https://dx.doi.org/10.2991/978-94-6463-942-1_9
In: Peristiwady, T. et al. (2025). Proceedings of the 3rd International Seminar on Fish and Fisheries Sciences (ISFFS 2025). Advances in Biological Sciences Research, 51. Atlantis Press: [s.l.]. e-ISBN 978-94-6463-942-1. , more
In: Advances in Biological Sciences Research. Atlantis Press: Amsterdam. e-ISSN 2731-7846, more
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| Keywords |
Bioindicators
Composition > Community composition
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| Author keywords |
Environmental gradients; Microalgae; Lombok |
| Authors | | Top |
- Astuti, S.P.
- Affandi, M.
- Soegianto, A.
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| Abstract |
Coastal ecosystems such as mangroves and coral reefs support marine biodiversity and stability, with microalgae as primary producers and environmental sentinels. We present the first comparative assessment of microalgal diversity and environmental drivers across adjacent mangrove and reef habitats in Sekotong coastal waters, Lombok Island, Indonesia. Monthly sampling over four campaigns used 20 µm plankton nets at fixed, georeferenced stations, while in situ measurements recorded water temperature, salinity, dissolved oxygen (DO), current velocity, light intensity, pH, nitrate, and phosphate. Species were identified via an integrative morphological and database-validated approach. A total of 50 species were recorded: 30 shared, 12 mangrove-exclusive, and 8 reef-exclusive. Generalists (e.g., Amphipleura pellucida, Cerataulina smithii) showed broad tolerance, whereas specialists (e.g., Nitzschia sigma, Achnanthes brevipes) indicated habitat specificity. Mangroves exhibited greater salinity swings and lower DO/light, while reefs had stable, oxygen-rich, well-illuminated conditions (p < 0.05). Correlation analyses revealed significant inverse relationships between salinity and DO/light. Microalgal genera were classified into ten bioindicator categories, providing a novel framework for ecosystem monitoring. This work establishes baseline data and introduces a targeted bioindicator scheme for coastal management. |
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