The influence of physicochemical environment on the distribution and abundance of mangrove gastropods in Ngurah Rai Forest Park Bali, Indonesia

Abstract

Abstract. Imamsyah A, Arthana IW, Astarini IA. 2020. The influence of physicochemical environment on the distribution and abundance of mangrove gastropods in Ngurah Rai Forest Park Bali, Indonesia. Biodiversitas 21: 3178-3188. Ngurah Rai Forest Park is the widest mangrove ecosystem in Bali that close to the business center and tourism area. The strategic location of the Ngurah Rai Forest Park is estimated to produce anthropogenic waste that can disrupt the gastropod population and stability of the mangrove ecosystems. This study aims to analyze the mangrove density, distribution, and abundance of gastropods based on the quality of the biophysical environment. Mangrove data collection was carried out using a plot transect of 10 m x 10 m, 5 m x 5 m, and 1 m x 1 m. Meanwhile, samples gastropods were collected on a plot transect of 0.5 m x 0.5 m in plot transect of 5 m x 5 m. A total of 11 gastropods species and 6 mangrove species were recorded in this study. The dominant gastropods species found were Assiminea brevicula (28 ind/m2). Species mangrove of Sonneratia alba and Rhizophora apiculata found were in all study sites with tree density values of 1000 ind/ha. Subsequently, the ecological index calculation results show that the diversity index (H’) (2.89-3.2), evenness index (E) (0.87-0.93), and dominance index (C) (0.12-0.17). Based on the Principal Component Analysis (PCA) found was Assiminea brevicula spread on sand and silt substrates and adaptive to the temperature condition, salinity, pH, and dissolved oxygen. Furthermore, other analysis results showed that Cerithidea cingulata, Cerithidea quadrata, Littoraria articulata, and Littoraria scabra were found on clay substrate with high C-organic content. In conclusion, gastropods are evenly distributed and no species dominate the ecosystems.

Struktur Komunitas Gastropoda pada Kawasan Mangrove Pantai Gerupuk Lombok Tengah

“…Ekosistem mangrove menyediakan keanekaragaman hayati seperti beragam jenis biota asosiasi (Japa et al, 2021) salah satunya gastropoda yang termasuk salah satu kelompok moluska paling dominan dan makrofauna yang paling banyak di ekosistem mangrove dan sebagian besar hidup di permukaan tanah (Kabir et al, 2014). Jika terdapat keanekaragaman dan jumlah individu gastropoda yang sedikit dalam ekosistem mangrove maka dapat dipastikan ekosistem hutan mangrove tersebut terganggu (Imamsyah et al, 2020). Berkurangnya gastropoda akan mengurangi proses dekomposisi di hutan mangrove .…”

Kondisi Biometrik Kerang Darah, Tegillarca granosa, di Pesisir Pantai Utara Kota Banda Aceh

“…Menurut Dewi et al (2019), kerang darah cenderung menyukai kawasan pesisir dengan dominasi substrat berpartikel halus. Beberapa penelitian sebelumnya mengungkapkan bahwa pada kondisi normal, komposisi sedimen berpartikel halus yang tinggi identik dengan peningkatan kandungan Corganik (Barus et al 2019;Imamsyah et al 2020). Namun demikian, hasil penelitian ini menunjukkan bahwa stasiun Deah Raya yang memiliki komposisi lumpur dan pasir sangat halus yang lebih rendah dibanding dua stasiun lainnya, justru memiliki kandungan C-organik yang lebih tinggi.…”

Untitled

“…Gastropods was identified utilizing taxonomic keys in [2,6,7,[15][16][17]. Mangroves were identified utilizing taxonomic keys in [18,19].…”

“…They are primary consumers in the trophic levels of the mangrove ecosystem, either as grazers or as suspension feeders. There is paucity on the literature related to gastropods with respect to their abundance in Malaysian mangroves [2][3][4][5][6][7]. Gastropods have ecological roles in the mangrove food web and such roles are poorly understood [8][9][10][11].…”