Limulidae (Horseshoe crab), or Mimi in the local name, are known; there are four species, namely Limulus polyphemus in North America and Asia, namely Tachypleus tridentatus, T. gigas, and Carcinoscorpius rotundicauda. In Indonesia, these species are protected by the Decree of the Minister of Forestry Number 12/KPTS-II/1987; meanwhile, illegal fishing still occurs. This study aims to identify Limulidae species and analyze Mimi's morphometric characteristics and distribution in North Sumatra to conserve the species. This research was conducted using a quantitative descriptive method in Leidong, Sei Berombang, Tanjung Tiram - North Sumatera, from September to December 2021. Biometric measurements were performed on 98 Mimi, and the data were statistically analyzed using the Kruskal Wallis test, Mann-Whitney test, and Multinomial logistics. The results showed that Mimi in the study area was identified as Tachypleus tridentatus, T. gigas, and Carcinoscorpius rotundicauda. The most commonly caught was T. tridentatus at the Tanjung Tiram. Based on the maximum width of the prosoma and body length, the largest to most petite sizes are T. tridentatus at Leidong (10.31 cm), T. gigas at Leidong, and Sei Berombang (10 cm) and C. rotundicauda at Sei Berombang (7.56 cm) respectively. The cluster analysis based on 27 morphometric characters showed that T. tridentatus had almost the same characteristics as T. gigas, while C. rotundicauda had its features. It can be concluded that the largest to most petite sizes of Mimi in the study area were T. tridentatus, T. gigas, and C. rotundicauda, respectively.
ABSTRAK: Pantai Bandengan dan Pulau Panjang merupakan salah satu tempat obyek wisata yang berada di Jepara. Aktivitas perkapalan merupakan salah satu sumber penyebab masuknya bahan pencemar logam berat kedalam perairan. Tujuan penelitian ini adalah mengetahui kandungan logam berat Pb (Timbal) pada air, sedimen dan lamun Enhalus acoroides (akar, batang dan daun), dan mengetahui kemampuan Enhalus acoroides dalam mengakumulasi dan Translokasi logam berat Pb di perairan Pantai Bandengan dan Pulau Panjang, Jepara. Penelitian ini menggunakan metode deskriptif analitik, sedangkan metode penentuan lokasi menggunakan metode purposive sampling. Materi yang digunakan dalam penelitian ini adalah sampel, air, sedimen dan akar, batang, daun lamun Enhalus acoroides. Penelitian dilaksanakan pada bulan Oktober-November 2019. Analisis sampel dilakukan di Laboratorium Kimia Analitik Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Gadjah Mada. Hasil penelitian menunjukan nilai akumulasi logam berat Pb (Timbal) pada akar Enhalus acoroides di Pantai Bandengan berkisar antara 1,83 – 2,16 mg/l dan pada Daun berkisar antara 1,50 – 2,16 mg/l, sedangkan akumulasi logam berat pada Pb (Timbal) pada akar Enhalus acoroides di Pulau Panjang berkisar antara 1,66 – 2,82 mg/l dan pada daun 1,33 – 2,98 mg/l. Kemampuan lamun Enhalus acoroides yang ada di Pantai Bandengan dan Pulau Panjang dalam mengakumulasi logam berat Pb (Timbal) termasuk dalam kategori rendah dengan nilai faktor biokonsentrasi rata-rata < 250. ABSTRACT: Bandengan Beach and Panjang Island are one of a tourist destinations in Jepara. The activities of shipping are ones caused of heavy metal pollutions into the waters. Seagrass is flowering water plants and the ability to adapt to live and grow in the marine environment. Enhalus acoroides is a type of seagrass that grows around Bandengan Beach and Panjang Island. The presence of seagrass in the sea can be a bioindicator of heavy metal pollution because to absorbs accumulate contaminants.. The pupose of this research ware to know and compare the content of heavy metals Pb (Lead) in Waters, Sediment, and roots, stems, leaf in Enhalus acoroides Seagrass in Bandengan Beach and Panjang Island. This research used descriptive method, while the method of determining the location used purposive sampling method. The material used in this research are the samples of Waters, Sediment, and roots, stems, leaf in Enhalus acoroides Seagrass. The research was carried out in Oktober-November 2019. The analysis of samplescarried out in the laboratory of analytical chemistry, Faculty of Math and Science, Gajah Mada University. The results showed the value of the accumulations of heavy metal Pb (Lead) from the root Enhalus acoroides in Bandengan Beach ranging between 1,83 – 2,16 mg/l and 1,50 – 2,16 mg/l from the leaves, while the acvumulations of heavy metals Pb (Lead) from the root Enhalus acoroides in Panjang Island range between 1,66 – 2,82 mg/l and 1,33 – 2,98 mg/l from the leaves. The ability Enhalus acoroides in Bandengan Beach and Panjang Island to accumulate the heavy metals Pb (Lead) can be concluded under low category because of bioconcentrate factor value <250
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