Conditions of Decapods Infraorders in Dead Coral Pocillopora sp. at Pemuteran, Bali: Study Case

at Pemuteran, Bali was conducted in 2011 and 2016. Pemuteran is a district in West Bali known for its high marine biodiversity. The research aimed to compare the conditions of decapods infraorders living in dead coral Pocillopora sp. before and after coral bleaching in 2016. Coral bleaching occurred in Indonesian waters, including in Pemuteran, Bali, resulting in coral reefs mass death. The study found that the total number and density of decapods found in dead corals of Pocillopora sp. in 2016 were higher than in 2011. The number of families of decapods found in 2011 and 2016 was the same, 12 families, but with different diversity. The family of Dromiidae and Thalassinidae found in 2011 but not discovered in 2016, while Majoidea and Axiidae found in 2016 but did not appear in 2011. The number of decapods individuals of each family generally increased in 2016 compared to 2011, with the highest increase in Xanthidae. The relative abundance of decapods infraorders Anomura, Brachyura, and Axiidae increased from 2011 to 2016, while Macrura and Gebiidae infraorders experienced a decrease. The diversity index (H') of decapods on each infraorder had different values, with Brachyura in 2016 and Macrura in 2011 included in the medium category, and the others in the low category. The study found that there was an increase in the density of decapods after coral bleaching, but the diversity of decapods was slightly changed. The study used a sampling method to collect dead corals from 8-12 meters depth in 2016. The dead corals were pulled out from the substrate by hammer and chisel, and then brought to the laboratory for further process. The volume of each dead coral was measured by using water displacement method in a bucket. The organisms found in the dead corals were sorted based on morphological characters and identified up to family levels, including infraorder. The identification of decapods was done based on Crustacean Guide of the World. The study calculated and categorized abundance, relative abundance, diversity index, uniformity index, dominancy index, and density based on the formula of Odum, Krebs, and English et al. The results showed that the total number and density of decapods found in dead corals of Pocillopora sp. in 2016 were higher than in 2011. The study found that there was an increase in the density of decapods after coral bleaching, but the diversity of decapods was slightly changed. The study concluded that the conditions of decapods infraorders living in dead coral Pocillopora sp. in 2016 were different from those in 2011. The study suggested that the increase in the density of decapods after coral bleaching may be due to the availability of food and habitat in the dead corals. The study also suggested that the diversity of decapods was slightly changed, which may be due to the changes in the environment and the availability of food and habitat. The study has implications for the management and conservation of marine ecosystems, particularly in areas with high coral bleaching events. The study suggests that the increase in the density of decapods after coral bleaching may be a sign of resilience in the ecosystem, but the slight change in diversity may indicate a need for further conservation efforts. The study also highlights the importance of monitoring and studying the effects of coral bleaching on marine ecosystems.