Diversity and distribution of mollusks at three zones of mangrove in Pejarakan, Bali, Indonesia

Abstract

Abstract. Ginantra IK, Muksin IK, Suaskara IBM, Joni M. 2020. Diversity and distribution of mollusks at three zones of mangrove in Pejarakan, Bali, Indonesia. Biodiversitas 21: 4636-4643. The diversity of mangrove species in mangrove zonations on the coast of Pejarakan plays an important role in the existence of faunal diversity, including those from mollusks. Mollusks are the dominant phylum associated with mangrove habitats, in addition to the species of the Crustacean subphylum. This research aimed to determine the diversity of mollusks and their distribution patterns in three mangrove zones in Pejarakan, Buleleng District, Bali Province, Indonesia. Data collection was conducted by establishing sampling plots across three mangrove zones, i.e. seaward zone, middle zone, and landward zone. There were 23 sampling plots in total with size of each plot was 1x1m. The species and number of individuals of each species of mollusks were recorded in each quadrat plot. The diversity of mollusks was calculated using the Shannon-Wiener index, evenness index, and dominance index, while the pattern of distribution of mollusks was measured using the Morisita index. The results of the study found 27 species of mollusks, consisting of 19 species from Gastropods group, 7 species from Bivalvia group and 1 species from Polyplacophora (chiton). The seaward zone showed the highest species diversity, while the landward zone had the lowest. Terebralia palustris had the highest abundance with 217 individuals/m2 and was distributed in the three mangrove zones. Planaxis sulcatus showed the highest abundance (87 ind./m2) in the seaward zone, and Telescopium telescopium showed a fairly high abundance and were distributed in the mid zone and the landward zone. In general, mollusks in the mangrove area of Pejarakan was distributed in a group/clustered pattern. The data from this research can serve as a reference in mangrove forest conservation efforts and mangrove forest used for ecotourism.

Nutritional Value of Gastropod Cassidula from the Mangrove Area of Desa Bakau, Sambas Regency, West Kalimantan

“…Secara ekologi, Cassidula tersebar luas di daerah tropis, dapat hidup di daerah transisi antara darat dan laut (Bremner, 2008), serta memiliki toleransi tinggi terhadap perubahan kondisi lingkungan (Amin et al, 2009). Hasil penelitian sebelumnya, Cassidula banyak dilaporkan hidup di ekosistem mangrove (Ginantra et al, 2020;Merly, 2020;Saleky dan Merly, 2021;Syahrial et al, 2021;Yuliawati et al, 2021), khususnya pada akar mangrove Rhizophora (Ariyanto et al, 2018;Merly et al, 2022).…”

“…Kandungan lemak dari Cassidula sebesar 1,73%, lebih kecil dibandingkan dengan C. obtusa (7.90%) dan T. palustris (3,31%) (Pasaribu et al, 2018). Lemak adalah sumber utama energi pada proses metabolisme dan memiliki peran penting dalam pembentukan membran sel dan jaringan (Govindarajalu et al, 2016), dan juga diperlukan untuk pertumbuhan. Variasi kandungan lemak pada gastropoda dipengaruhi oleh jenis/spesies, tingkat kematangan gonad, umur, dan bagian tubuh.…”

Perspective Chapter: Mangrove Conservation – An Ecotourism Approach

“…Data on the diversity of flora, fauna and ecotourism attractions in the study area is the result of the author's observations and from several sources of articles that have been published in journals or books including [5,[17][18][19][20][21][22].…”

Diversity of mollusks in the Segara Batu Lumbang mangrove forest, Pemogan Denpasar Bali

“…But a little different for the family Muricidae and Littorinidae are less dominant in the mangrove habitat compared to the Segara Batu Lumbang Mangrove. Species from the Family Littorinidae and Potamididae are also quite dominant in the Kampoeng Kepiting mangrove of Tuban Badung Bali and in mangrove forest Sutera Village Sukadana District Kayong Utara Regency [19,27] and Gastropods from the Potamididae, Muricidae, Niritidae and Littorinidae family are also quite dominant in the coastal mangrove of Pejarakan Buleleng [3]. Species from the Family Arcidae (Bivalvia) are also dominant in Mangrove Pejarakan Buleleng Bali [3] and in coastal of Tanjungbalai, North Sumatera [5].…”

“…Members of this class have two shells connected by ligaments, namely an elastic hinge [1,11,15]. Some mollusk diversity studies in mangrove forests in Bali have been carried out, including Ginantra et al (2020) [3] found 27 Species Mollusks in the coastal mangrove forest of the Pejarakan Buleleng, Pratiwi et al (2022) [19] found as many as 12 species in mangrove Kampoeng Kepiting Tuban Badung Bali, and Suartini et al (2013) [25] found as many as 17 species of mollusks at the Ngurah Rai Mangrove Information Center, Bali. Research on Mollusks species in the mangrove forest of the Segara Batu Pemogan tourist area has not been carried out, so this research is important to do.…”