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"EFFECTS OF CONCENTRATION, AND BODY SIZE ON THE BIOACCUMULATION OF MERCURY ON THE ARK COCKLES ANADARA ANTIQUATA. The kinetics of mercury bioaccumulation on the ark cockles Anadara antiquata were investigated by using radiotracer. An aquaria experiments applied to two groups of cockles, that were smaller (10-20mm) and bigger cockles (35-45 mm), three individuals each, with two replications. Four Hg2+ concentration (0.0025; 0.005; 0.01; and 0.02 μg.L-1) with 0.5 Bq.L-1 of 203Hg2+ were treated to both groups. The experiments of bioaccumulation lasted for 14 days, continued with 5 days depuration treatments. The observed variables were Bioconcentration Factor (BCF), uptake rates, efflux rates, contents of mercury in the body, and elimination rates of mercury. The models to predict BCF and elimination rates also had made. The results showed that Hg2+ bioaccumulation on smaller cockles was higher than bigger cockles. The increased of Hg2+ concentration in the water decreased the BCF on both groups. By the steady state of exposure period, the Bioconcentration Factor (BCF) of Hg was 775,532 on smaller cockles, and 378,708 on bigger cockles. The increased of Hg2+ concentration in the medium effected the increased ofHg2+ efflux rates, and Hg2+ contents in the body on both groups, but decreased the uptake rates on bigger cockles. There were no significant differences of Hg2+ retention percentage during depuration time on both groups."

"Penelitian tentang studi populasi kerang gelatik Anadara (Cunearca) pilula (Reeve, 1843) telah dilakukan di Pantai Panimbang, Kabupaten Pandeglang, Banten pada bulan Juli 2012. Penelitian bertujuan untuk mengetahui kepadatan, distribusi populasi, serta kaitannya dengan faktor lingkungan. Sampel diambil dengan menggunakan metode transek kuadrat di 3 Stasiun penelitian yang berbeda ekosistem (mangrove, kebun kelapa, dan pemukiman penduduk) dengan 3 kali pengulangan serta pengukuran parameter lingkungan. Berdasarkan hasil penelitian, jumlah kerang gelatik yang ditemukan di 3 Stasiun adalah 59 individu. Kepadatan populasi dan frekuensi kehadiran kerang gelatik tertinggi terdapat di lokasi depan kebun kelapa yaitu 2 individu/m2 dan 80%, faktor lingkungan yang terukur di ketiga Stasiun yaitu suhu, salinitas, pH, oksigen terlarut, kedalaman, tipe substrat, dan kadar organik substrat yang berada pada kisaran normal. Secara umum, pola distribusi kerang gelatik di ketiga Stasiun adalah mengelompok.

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Research on population study of little ball ark Anadara (Cunearca) pilula (Reeve, 1843) has been conducted at Panimbang Beach, Pandeglang Regency, Banten on July 2012. The study aimed to determine the density, population distribution, and related to environmental factors. Samples were taken using a transect squares method in 3 different ecosystems Stations (mangrove forests, coconut plantations, and villages) with 3 replicates and the measurement of environmental parameters. Based on the results of the study, the total of little ball ark collected in 3 stations was 59 individuals. The highest of population density and frequency little ball ark in front of coconut plantations were 2 individual/m2 and 80%, with environmental factors that measured at 3 Stations were temperature, salinity, pH, dissolved oxygen, depth, substrate type, and substrate organic level which in normality. In general, distribution patterns of little ball ark in three Stations were clumped."