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<p>This study examines the local population dynamics of the mud crab (<i>Scylla olivacea</i>) in selected mangrove areas of Ambon Bay, Indonesia, over a full annual cycle, highlighting spatial and temporal patterns. Sampling was conducted purposively across four zones (seaward, frontal, central, and rear) in Passo, Waiheru, and Tawiri. Parameters analyzed included density, sex ratio, size structure, growth patterns, condition factors, and reproductive stages. Results show declining population density, with the highest densities in rear and frontal zones characterized by dense mangrove vegetation and fine substrates. The sex ratio was male-biased, while female individuals were predominantly small (&lt; 13.4&#xa0;cm), suggesting potential overexploitation. Growth patterns exhibited spatial variability, with positive allometry in Passo and Waiheru but negative allometry in Tawiri. Reproductive activity occurred year-round, peaking in February and August, with mature females concentrated in zones with high salinity and temperature. Rather than aiming for broad generalization, this study provides detailed local insights into the ecology of <i>S. olivacea</i> populations in Ambon Bay, a critical but understudied area within the Wallacea biogeographic zone. The findings emphasize the need for sustainable management and habitat conservation to ensure the species’ long-term viability and its ecological and economic roles.</p>

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Population characteristics of the mud crab (Scylla olivacea) in the mangrove ecosystem of Ambon Bay, Maluku, Indonesia

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Laura Siahainenia,
  • Debby A. J. Selanno,
  • Novianty C. Tuhumury,
  • Rahman Rahman

摘要

This study examines the local population dynamics of the mud crab (Scylla olivacea) in selected mangrove areas of Ambon Bay, Indonesia, over a full annual cycle, highlighting spatial and temporal patterns. Sampling was conducted purposively across four zones (seaward, frontal, central, and rear) in Passo, Waiheru, and Tawiri. Parameters analyzed included density, sex ratio, size structure, growth patterns, condition factors, and reproductive stages. Results show declining population density, with the highest densities in rear and frontal zones characterized by dense mangrove vegetation and fine substrates. The sex ratio was male-biased, while female individuals were predominantly small (< 13.4 cm), suggesting potential overexploitation. Growth patterns exhibited spatial variability, with positive allometry in Passo and Waiheru but negative allometry in Tawiri. Reproductive activity occurred year-round, peaking in February and August, with mature females concentrated in zones with high salinity and temperature. Rather than aiming for broad generalization, this study provides detailed local insights into the ecology of S. olivacea populations in Ambon Bay, a critical but understudied area within the Wallacea biogeographic zone. The findings emphasize the need for sustainable management and habitat conservation to ensure the species’ long-term viability and its ecological and economic roles.