Density mangrove relationship with gastropod abundance in Pulau Rambut wildlife reserve

The mangrove forest ecosystem has a significant contribution to the biota that live in the surrounding waters as a food source, one of which is the gastropod class. The purpose of this study is to determine mangrove density, gastropod abundance, and the correlation between mangrove density and gastropod abundance. This research was conducted in March to June 2022 in the Pulau Rambut Wildlife Reserve. The method used in this research is a survey method in the field by drawing a line 50 meters long, then dividing the line into three plots, measuring 10 x 10 meters with a distance between plots of 10 meters. In order to determine the sampling point to take gastropods is by using the purposive sampling technique was used. The data is categorized based on the variables. Mangrove density is variable X, and the abundance of gastropods is variable Y. The results showed that the mangrove density in the North, East, and Southwest of the Pulau Rambut Wildlife Reserve was included in the very good category with a value of 33,400 ind/ha. The highest abundance of gastropods was dominated by the species Aclis sp., with a total of 4,089 individuals, and the lowest was Monodonta sp. totaling six individuals. Mangrove substrate and organic matter content in the area determine the abundance of gastropods. The correlation between mangrove density and gastropod abundance was calculated using simple linear regression analysis with a correlation coefficient of 0.148, while the value of a determination coefficient was 0.022, which means it is positively correlated.