Abundance and Potential of Asteroidea as Bioindicator of Lead (Pb) in the Coastal Zone at Bangkalan Regency, Madura

Asteroidea is a marine invertebrate that has a role as a bioindicator, but the research related to abundance and potential of Asteroidea as a bioindicator of lead on Madura Island is not to be done. This study aimed to analyze the effect of Pb concentration on Asteroidea population density in Bangkalan Regency. The transect plotting method with a plot measuring 1x1 m2 with as 30 plots in the intertidal zone for collecting data. Seawater sampling was divided into three stations, such as station I-0 meters (edge), station II-50 meters (middle) and station III-100 meters (deep zone). Data analysis was carried out with quantitative descriptive with Asteroida composition including diversity index, relative density and dominance index as parameters. The results obtained were species of starfish, Cryptasterina sp. and Aquilonastra coronata with a diversity index value of 0, a relative density of 100% and a dominance index of 1. The results for Pb concentration on Tengket Beach at a depth of 0 meters, 50 meters and 100 are 0.072 ppm; 0.16 ppm; 0.61 ppm and Pantai Modung at 0.5 ppm; 0.83 ppm; 0.82 ppm. Based on the analysis of the abundance of Asteroidea, as higher of Pb concentration contained in the waters, the lower Asteroidea’s density will be found. It concluded the abundance of Asteroidea population can be used as an indicator of Pb in coastal waters.