<![CDATA[This study aims to analyze the abundance and diversity of mangrove crabs (Scylla spp.) in the mangrove area of Jambu Beach, Pajo District, Dompu Regency, West Nusa Tenggara. The research was conducted from October to December 2024 using a quantitative descriptive survey method. Sampling was carried out purposively at three stations with different substrate types: mud, clay, and black mud. Specimens were captured using collapsible traps for eight hours with three replications. The identification results revealed three species of Scylla spp., namely S. serrata, S. paramamosain, and S. tranquebarica. The total abundance ranged from 0.36 to 0.48 ind/m², with the highest found at Station 2 (0.48 ind/m²). The diversity index (H’) ranged from 0.349–0.995, the evenness index (E) from 0.318–0.906, and the dominance index (D) from 0.037–0.089. The highest diversity (H’ = 0.995) and evenness (E = 0.906) were recorded at Station 3, while the highest dominance occurred at Station 2 (D = 0.089). Statistical analysis using one-way ANOVA showed significant differences in abundance among stations (F = 24.818; p = 0.001). These results indicate that variations in substrate, salinity (30–32 ppt), temperature (28–29°C), and soil pH (7.1–7.3) influence the abundance and community structure of Scylla spp. in the mangrove ecosystem. The findings provide baseline data for the sustainable management of mangrove crab populations and conservation of coastal ecosystems in the Dompu region.]]>
