Exploring Mollusc Life in the Deep Waters of Ambon Bay

The inner part of Ambon Bay is known for its abundant fishery resources. One of the key groups in this ecosystem is molluscs—soft-bodied animals such as sea snails, clams, and mussels—that have long been utilized by local communities as a source of food and income.

Map of research locations in Teluk Ambon (source: JMI)

However, environmental pressures caused by settlement expansion, sand mining, resort and café construction, and overharvesting are beginning to threaten the sustainability of molluscs in this area. To understand the current status of mollusc populations, a recent study analyzed their community structure in the deep waters of Ambon Bay.

Mapping Mollusc Community Structure

The research, conducted by Rosmi Pesilette from the Deep Sea Research Center – BRIN, along with Yuliana Natan and Pruley Annete Uneputti from Pattimura University, was carried out in January 2024 using the square transect method at three locations:

• Tanjung Tiram

• Poka Village

• Waiheru Beach and Passo Beach

The survey recorded 36 mollusc species, consisting of:

• 22 gastropod species (sea snails)

• 14 bivalve species (clams and related species)

The most abundant species was Hebra corticata from the Nassaridae family, while the least common were species from the Bursa, Cymatium, and Nerita genera.

Diversity and Distribution Patterns

The analysis revealed:

• Diversity Index (H') = 2.166 → moderate diversity

• Evenness Index (E) = 0.604 → relatively even distribution

• Dominance Index (D) = 0.236 → no single species overwhelmingly dominates

Mollusc distribution patterns were found to be random in some areas and clustered in others, reflecting adaptation to varying environmental conditions.

Why Is This Study Important?

Molluscs play a vital role in marine food webs, water quality maintenance, and the livelihoods of coastal communities. By understanding their community structure and distribution patterns, conservation efforts can be more targeted to prevent population decline from human activities.

Conclusion

The deep waters of Ambon Bay host a rich diversity of molluscs, yet their survival is increasingly at risk. This research provides essential baseline data for sustainable management and protection of the marine ecosystem.

Reference

Pesilette, R., yuliana Natan, and P. A. . Uneputti. “Mollusc Community Structure in Deep Ambon Bay Waters”. Jurnal Moluska Indonesia, vol. 9, no. 1, Apr. 2025, pp. 8-17, doi:10.54115/jmi.v9i1.119.