Setyawan. 2018. Diversity of mangrove vegetation and carbon sink estimation of Segara Anakan Mangrove Forest, Cilacap, Central Java, Indonesia. Biodiversitas 19: 246-252. Mangrove forests are known as standing stores of sequestered atmospheric carbon. The role of mangrove forests in the sequestering substantial amount of atmospheric carbon dioxide (CO2) and storing the carbon in its biomass has been recently underscored. This research aimed to estimate vegetation diversity and carbon sink potential of Segara Anakan Mangrove Forest Cilacap, Central Java from August-December 2012. Vegetations sampling was done by square plots technique. Diversity index was utilized to determine species diversity. Allometric equations were used to estimate biomass and carbon sinks. This study only calculates aboveground biomass and carbon sinks. The research results showed that mangrove in Segara Anakan was composed of 24 species with 19 families, consisting of 16 species of trees, 14 species of saplings and 16 species of herbs. The most dominant tree was Avicennia marina with importance value of 43.62% in Kembang Kuning, 60.27% in Ujung Alang and 25.6% in Klaces. The most dominant of sapling was Avicennia marina, with an important value of 31.1%. The total biomass of a tree is about 43.06 kg/tree or 0.13 ton/ha. Total biomass of sapling was 27.38 kg/tree or 0.32 ton/ha. The carbon sink of the tree was 49.10 ton/ha and carbon sink of sapling was 79.39 ton/ha. It can be concluded that Segara Anakan Mangrove forest is very important as a carbon sink in South part of Central Java, Indonesia.

The long-tailed macaque (Macaca fascicularis) is a primate often found in Indonesia, with the current IUCN Red List status being endangered. One of the habitats of this species is the Kalisalak Forest. The social behaviour of this species has never been studied much; therefore, further research is needed on this site. This study aimed to analyse the frequency and duration of social behaviour of seven age groups of each sex. The study was conducted from April to July 2021. The research used scan sampling and continuous recording rules with 15-minute intervals (8:00 am-5:00 pm). The social behaviour data were analysed by ethogram percentage and compared with each social behaviour and age group using a statistical correlation test. The results show that the highest frequency is playing (42.92%), then grooming (41.29%), while the lowest is agonistic (8.33%), and then mating (7.46%). The duration of grooming (57.61%) is higher than playing (42.39%), while agonistic and mating are not counted because they are event behaviour. No frequency correlation (p-value>0.05) between grooming and age exists. A frequency correlation (p-value<0.05) between playing, agonistic, and mating with age group. There is no correlation (p-value>0.05) between the age group’s duration of grooming and playing.

Some heavy metals of Cd, Cu, Pb, and Hg polluted in Segara Anakan Cilacap, but no information on a specific heavy metal pollution in this area and an edible mud crab of Scylla serrata. The research aimed to know their distribution in this area and their accumulation of heavy metals from waters and sediments to Scylla serrata. The study was done using a survey method with purposive random sampling at six stations from Station SA-2-28 and SA-3-46 (with a high percentage mangrove canopy cover) to Station SA-2-24, SA-3-35, SA-1-10, and SA-3-16 (with a low percentage mangrove canopy cover). Three replications were done in the dry season conditions from July to September. The researcher took all samples with the water sampler tool, sediment core, and baited trap for sampling. Then, they were analyzed using Atomic Absorption Spectrophotometry (AAS) method. The result showed that the lowest heavy metals were at Station SA-2-28 and SA-3-46 and followed by Station SA-2-24, SA-3-5, SA-1-10, and SA-3-16 due to the high percentage of mangrove canopy cover, while the reserve order was due to the increased pollution in east side areas of Segara Anakan Cilacap. The heavy metal accumulation of Cd, Cu, Pb, and Hg has occurred from waters and sediments to Scylla serrata.