Short Communication: Spatial distribution and diversity of intertidal crustaceans in karstic beaches of southern Java, Indonesia
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Abstract. Hartono DAN, Widowati D, Saputra EF, Wicaksono FR, Pramadaningtyas PS, Yap CK, Setyawan AD. 2025. Short Communication: Spatial distribution and diversity of intertidal crustaceans in karstic beaches of southern Java, Indonesia. Indo Pac J Ocean Life 9: 26-35. Karstic coastal systems in tropical regions are often overlooked in biodiversity assessments despite their ecological complexity and vulnerability. This study investigates the species composition, diversity, and environmental drivers of intertidal crustacean communities across five karstic beaches in Gunungkidul, Indonesia. A total of 18 crustacean species were recorded, with Coenobita scaevola emerging as the most dominant and widely distributed taxon. Species richness and the Shannon-Wiener diversity index (H?) varied significantly among sites, with Ngrenehan Beach exhibiting the highest diversity (H?=2.18) and Ngrawah the lowest (H?=1.23). Among the measured abiotic parameters, dissolved oxygen (DO) showed the strongest positive correlation with H? (r=0.92, p<0.05), indicating its critical role in structuring crustacean assemblages. Cluster analysis revealed two distinct site groups, reflecting spatial heterogeneity in species composition likely shaped by microhabitat features. The findings underscore the importance of karstic intertidal habitats as localized biodiversity reservoirs and emphasize the need for site-specific conservation strategies and long-term ecological monitoring in tropical coastal regions.
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