Association of crustacean diversity with mangrove vegetation in perancak mangrove forest, Jembrana, Bali

The study aims to determine the diversity of crustaceans and their association with mangrove vegetation in the Perancak Mangrove Forest. Sampling was carried out using the square method. A total of 30 squares were carried out in three mangrove forest zones (land, middle and estuary zones). Species diversity was analyzed using the Shannon-Wiener index. The strength of the association of crustaceans with mangroves was analyzed using the Ochiai Index and DCA (Detrended Correspondence Analysis) correspondence. The results of the study found 15 species of crustaceans included in 3 families. the most dominant of which were Sesarmidae and Ocypodidae. The most dominant crab species include Sesarma roberti, Sesarma pictum, Uca anulipes, Perisesarma eumolpe and Uca vocans. The crustacean diversity index is 2.50, the evenness index is 0.92, including the moderate category. This indicates that the condition of the Perancak mangrove forest is in the stable category. Crustaceans are associated with mangroves in four strata, namely the substrate, roots, stems and leaves of mangrove vegetation. There are 11 species of mangrove plants associated with 15 species of crustaceans in the Perancak mangrove sampling area. This association can be based on the presence of crustaceans on the substrate, roots, stems and leaves of mangrove plants where both species are found together in a sampling plot. The strength of the association ranges from very low to very high. Several species show high associations including Sesarma pictum-Avicennia marina, Sesarma pictum-Excoecaria agallocha, Sesarma quadrata-Ceriops decandra, Sesarma quadrata-Xylocarpus granatum, Uca crassipes-Avicennia lannata, and Uca dusumieri-Bruguiera gymnorhiza.