Komposisi dan Distribusi Gastropoda di Desa Bakau Besar Laut Kecamatan Sungai Pinyuh, Kabupaten Mempawah

Gastropoda adalah salah satu biota yang sering digunakan sebagai indikator lingkungan suatu perairan. Lokasi Bakau Besar Laut memiliki 3 rona lingkungan yaitu pemukiman, ekowisata, dan tambak udang. Sebagai dasar dari penelitian ini membutuhkan informasi terkait kualitas lingkungan dengan gastropoda sebagai indikator. Penelitian ini bertujuan untuk mengetahui komposisi dan distribusi gastropoda di Desa Bakau Besar Laut Kecamatan Sungai Pinyuh, Kabupaten Mempawah. Masing-masing stasiun dibuat 1 garis transek sepanjang 23 m. Setiap transekterdiri dari 3 plot berukuran 1 x 1 m dengan jarak antar plot 10 m. parameter lingkungan yang diukur meliputi suhu, pH, salinitas, dan jenis substrat. Berdasarkan hasil penelitian ditemukan komposisi dari jenis-jenis gastropoda yaitu Cerithidea cingulata, C. obtusa, C. weyersi, Littoria scabra, L. undolata, Nerita violacea, Strombus mutabilis dengan pola distribusi mengelompok.

POPULATION DENSITY AND LENGHT-WEIGHT REALTIONSHIP IN MANGROVE GASTROPOD Cerihidea cingulata AND Littoraria scabra OF PANGKALAN SESAI VILLAGE, DUMAI CITY

Cerithidea cingulata and Littoraria scabra are type of snail that use mangrove ecosystems as one of their habitat. Dumai is one of the industrial cities in the province of Riau, where various kinds of human activities can disrupt the ecosystem of mangroves and its associated biota. This research was conducted in October 2018 in the Mangrove Forest Area (PAB) of Pangkalan Sesai village of Dumai City, aiming to determine population densities and length-weight relationship of C. cingulata and L. scabra. The method used in this study is a survey method. Sampling was conducted by using the line transect method, where each station consists of 3 transects and each transect consists of 3 sampling points as replications. The results showed the population density of C. cingulata and L. scabra snails was higher than at stations near the Dumai river estuary compared with the population near by mangrove forest and length-weight relationship showed that the growth patterns of both C. cingulata and L. scabra were allometric negative and have strong correlation value.

Kelimpahan dan Keanekaragaman Gastropoda di Kawasan Mangrove Desa Bakau Besar Laut Kabupaten Mempawah

Hutan mangrove memberikan kontribusi besar terhadap bahan organik yang sangat penting sebagai sumber energi bagi biota seperti gastropoda. Penelitian ini bertujuan untuk mengetahui kelimpahan dan keanekaragaman gastropoda di Kawasan Mangrove Desa Bakau Besar Laut Kabupaten Mempawah Pengambilan sampel pada juni 2019. Penentuan stasiun pengamatan menggunakan purposive sampling terdiri dari 3 stasiun berdasarkan zona lingkungan yang mewakili wilayah pemukiman, ekowisata dan tambak. Hasil penelitian mendapatkan gastropoda sebanyak 7 spesies yaitu, Cerithidea cingulata, Cerithidea obtussa, Nerita violacea, Cerithidea weyersi, Littoria scabra, Strombus mutabilis, dan Littoria undolata. Nilai kelimpahan tertinggi pada stasiun I adalah Cerithidea cingulata dengan (63 ind/m2), pada stasiun II kelimpahan gastropoda tertinggi adalah Cerithidea cingulata (89 ind/m2)dan stasiun III Cerithidea obtussa dengan nilai (25 ind/m2). Nilai indeks keanekaragaman (H’) berkisar 0,60-1,18 dikategorikan sedang, nilai indeks keseragaman (E) berkisar 0,54-0,88 dikategorikan seragam, dan nilai indeks dominansi (D) 0,37-0,67 dikategorikan sedang.

Mollusca’s Density and Distribution Pattern in Kalangan Mangrove Forest Ecosystem

Shellfish is one of the organisms that have habitat in mangrove forests because it has a muddy substrate. However, mangrove forests in the coastal area of Kalangan, Central Tapanuli Regency have suffered environmental damage. Therefore, a research on the density and pattern of shellfish distribution is needed to be a recommendation for optimal, sutainable mangrove forest management. This research was conducted in September 2020. The method used in determining the location of sampling is purposive sampling method using 1x1m2 plot on the surface of muddy sand substrate. The results showed that the population density of Anodentia edentula 32 ind/m2 at Point I with grouping distribution patterns; Cerithidea cingulata 74 ind/m2 at Point I (grouping), 156 ind/m2 in Point II (grouping), and 126 ind/m2 in Point III (grouping); Cerithidea quadrata 2 ind/m2 in Point I (uniform); Clypeomorus sp 12 ind/m2 at Point I (uniform); Nerites sp 178 ind/m2 at Point I (group), 94 ind/m2 at Point II (group), and 418ind/m2 at Point III (grouping); Donax trunculus 3 ind/m2 at Point I (uniform); Sulcospira testudinaria 1 ind/m2 at Point I (uniform), 79 ind/m2 at Point II (grouping), and 32 ind/m2 at Point III (random), and Telescopium telescopium 2 ind/m2 at Point I (uniform), and 1 ind/m2 at Point III (random). So it can be concluded that the biodiversity of mollusca in mangrove forest ecosystems in the coastal area of Kalangan, Central Tapanuli Regency, is of low value so that it needs to be maintained for the sake of ecosystem balance and the availability of germplasm for future generations.

Bioakumulasi Logam Nikel dan Pola Ordinasi Pada Gastropoda di Kawasan Mangrove Sekitar Areal Bekas Lahan Pertambangan Kabupaten Konawe Utara Sulawesi Tenggara

This study aims to determine the bioaccumulation of nickel metal and the spatial distribution pattern of gastropods in the area of the former nickel mining area in Tokowuta Village, Lasolo District, North Konawe Regency, Southeast Sulawesi. The method used is a combination of the path method and sample plot. The parameters observed in this study include nickel bioaccumulation in gastropods, density, frequency, diversity index, uniformity index, dominance index, dispersal pattern, and PCA ordinance pattern. The results showed that there were seven species in this region where the highest nickel bioaccumulation was found in the type of Nerita lineata (0.068 ppm) and the lowest in Terebralia sulcata (0.017 ppm). The highest density and frequency were found in Terebralia sulcata (54.66% and 25.53%) and the lowest in Telescopium telescopium (1.93% and 4.26%). In this region has a low diversity index (1.36), a uniformity index that is an unstable community (0.70), a low index of dominance (0.35), cluster pattern distribution (1.19). The results of the PCA ordinance pattern study showed the spatial distribution of gastropod dissimilarity factors in each observation plot formed three clusters. Cluster 1 consists of plots 2 and 6. Cluster 2 consists of plots 3, 5, and 10. Cluster 3 consists of plots 1, 4, 7, 8, 9, 11, and 12. The spatial distribution of gastropod habitat factors in each observation plot forms three clusters with different characteristics. Cluster 1 is characterized by soil nickel content. Cluster 2 by salinity. Cluster 3 with pH and water temperature. The spatial distribution of gastropod types based on habitat characteristics can form four clusters. Cluster 1 consists of Littorariascabra. Cluster 2 consists of Terebraliasulcata species. Cluster 3 with Telescopium telescopium and Littoraria melanostoma species. Cluster 4 with Cerithidea cingulata, Cerithidea quadrata, and Nerita lineata species. Keywords: Nickel Metal, Gastropoda, Ordination PatternABSTRAKPenelitian ini bertujuan untuk mengetahui mengetahui bioakumulasi logam nikel dan pola distribusi spasial gastropoda di kawasanareal bekas lahan tambang nikel di Desa Tokowuta Kecamatan Lasolo Kabupaten Konawe Utara Sulawesi Tenggara. Metode yang digunakan adalah kombinasi antara metode jalur dan petak contoh. Parameter yang diamati pada penelitian ini meliputi bioakumulasi nikel pada gastropoda, kepadatan, frekuensi, indeks keanekaragaman, indeks keseragaman, indeks dominansi, pola penyebaran dan pola ordinansi PCA. Hasil penelitian menunjukkan terdapat tujuh spesies pada kawasan ini dimana bioakumulasi nikel tertinggi terdapat pada jenis Nerita lineata (0,068 ppm) dan terendah padaTerebralia sulcata (0,017 ppm). Kepadatan dan frekuensi tertinggi terdapat pada jenis Terebralia sulcata (54,66% dan 25,53%) dan terendah padaTelescopium telescopium (1,93% dan 4,26%).Pada Kawasan ini memiliki indeks keanekaragaman yang rendah (1,36), indeks keseragaman yang Komunitas Labil(0,70), indeks dominansi yang rendah (0,35), pola penyebaranmengelompok (1,19). Hasil penelitian pola ordinansi PCA menunjukkan sebaran spasial faktor disimilaritas gastropoda pada setiap plot pengamatan membentuk tiga cluster.Cluster 1 terdiri dari plot 2 dan 6. Cluster 2 terdiri dari plot 3, 5 dan 10. Cluster 3 terdiri dari plot 1, 4, 7, 8, 9, 11 dan 12. Sebaran spasial faktor habitat gastropoda pada setiap plot pengamatan membentuk tiga cluster dengan karakteristik yang berbeda. Cluster 1 dicirikan kadar nikel tanah. Cluster 2 oleh salinitas. Cluster 3 dengan pH dan suhu perairan. Sebaran spasial jenis gastropoda berdasarkan karakteristik habitat dapat membentuk empat cluster. Cluster 1 terdiri dari Littoraria scabra. Cluster 2 terdiri dari Terebralia sulcata. Cluster 3 dengan jenis Telescopium telescopium dan Littoraria melanostoma. Cluster 4 dengan jenis Cerithidea cingulata, Cerithidea quadrata dan Nerita lineata

Diversity and Distribution of the Mangrove Gastropods of Kuala Selangor Nature Park, Selangor

This study reports on the diversity and distribution of mangrove gastropods from Kuala Selangor Nature Park sampled from August to November 2017. The line transect with quadrat method was employed to sample gastropods which were handpicked from the various mangrove structures (root, stem, branch) and mangrove floor within 5m x 5m quadrats. Nineteen gastropod taxa were recorded from the Bruguiera, mixed (Bruguiera, Avicennia & Rhizophora), and Avicennia & Rhizophora zones. The Ellobiidae (Elobium aurisjudae and Cassidula aurisfelis), Potamidae (Cerithedia obtusa, Cerithidea cingulata and Telescopium telescopium), Muricidae (Chicoreus capucinus) and Naticidae (Nerita balteata) were the most distributed gastropod families at the study site. Gastropod horizontal distribution varied between tree zones (Bruguiera; Bruguiera-Avicennia-Rhizophora; and Avicennia-Rhizophora) and tree type (Brugueira, Rhizophora and Avicennia), while gastropod vertical distribution varied based on height on tree (0 – 120cm) and sub-habitats (roots, floor and trunk) as shown by the principle components analysis (PCA) biplots. The Margalef’s species richness (D=2.90) and Shannon-Weiner diversity (H’=2.32) was low which is typical of mangroves that are mature while Pielou’s evenness (J=0.77) was high implying lack of dominance by specific gastropod taxa.

Structure of Macrozoobenthos (Gastropods) Community in Mangrove Forest Ecotourism Pandansari Kabupaten Brebes, Central Java

Aims: This research aimed to analyze the abudance and diversity of macrozoobenthos in the Gastropod Class in the Ecotourism Waters of Pandansari Mangrove Forest, Brebes Regency, Central Java. Study Design: The research was conducted by survey. Place and Duration of Study: This research was carried out for 3 months between December 2018 until February 2019 in Ecotourism Forest Areas in Bakau Pandansari, Brebes Regency, Central Java. Methodology: The method used in this research was survey methods using primary data in the form of physical chemistry of aquatic data, gastropod abundance, diversity index, equitability index. Data collection techniques using purposive sampling in determining 3 stations and 3 repetitions. Data analysis in this research used descriptive statistics. Results: Research results found 9 species of Gastropods inhabiting the mangrove ecosystem, namely Casidulla aurisfelis, Cerithidea sp, Cerithidea alata, Cerithidea cingulata, Cerithidea obtusa, Polinices sp, Puperita sp, Telescopium telescopium and Turiculla nellial-suprius. Gastropod abundance ranged from 67 - 166 ind / m2. Gastropod diversity index in the medium category 2 <H’ ≤ 3. Uniformity values ranged from 0.79 to 0.81 with a high category. The relationship between water quality and gastropods had an R2 value of 97%, water quality can affect gastropod life and as much as 3% is influenced by other factors. Conclusion: Based on the results of this research that has been done, it can be concluded that in general environmental parameters in the Pandansari mangroves are still favorable in supporting the survival of the gastropods inhabiting them.

Diversity of Invertebrate Epifaunas Associating with Mangrove In Balangdatu Village Tanakeke Islands of South Sulawesi

Research on the diversity of invertebrate epifaunas associating with mangroves in the Balangdatu village of Tanakeke regency, Takalar district, South Sulawesi, has been conducted from September to December 2016. The objective of this research was to know the diversity of invertebrate epifaunas associating with mangrove in Balangdatu Village of Tanakeke Islands. Sample collection was done by using explorative quantitatively plot methods with size 2 x 2 m, applied at three different stations. Data analysis includes calculation of Absolute density, Uniformity Index (Shannon-wiener), Dominance Index, and Distribution Index. The results showed that there were 13 species of epi fauna of 9 tribes, namely Littoraria sp 1, Cerithidea cingulata, Littoraria sp 2, Littoraria pallescens, Episesarma sp, Saccostrea cucullata, Pagurus sp, Terebralia sulcata, Cerithidea sp, Nerita planospira, Nisto histrio, Littoraria scabra, and Cassidula vespertilionis. The highest density was found in Littoraria scabra with a density of 0.72 ind/m2. Diversity indices are low which indicate depressed environmental conditions. Distribution Index values across stations <1 indicating that the pattern of individual dispersion tends to be uniform.

ENVIRONMENTAL ASSESSMENT OF POLYCULTURE FARMING PRACTICE BASED ON MACROBENTHIC ASSEMBLAGES: A STUDY CASE AT COASTAL AREA OF KALIWUNGU, KENDAL (CENTRAL JAVA, INDONESIA)

The purpose of this study was to determine environmental quality parameters using number of species, diversity and similarity of macrobenthic communities. This study was conducted at two locations, the Location I was a polyculture farming area, farming milkfish (Chanos Chanos) and black tiger shrimp (Penaeus monodon) and seaweed Gracilaria sp. in the coastal area of Mororejo, Kendal District, Central Java. Location II was the coastal area of PT. Plywood Indonesia, which is located adjacent to industrial activities as well as directly affected the tide. Systematic random sampling was employed, measuring physical-chemical parameters of water and sediment. Samples of macrobenthos were taken from the sediment. Data was analysed using diversity and evenness indices approach. Samples of macrobenthos were taken from the sediment using Eckman grab, then was analysed using diversity and evenness indices approach. Results showed that the Location I was dominated by Cerithidea cingulata and Terebralia sulcata (Potamididae), Minima batillaria (Batillaridae). The Location II was dominated by Cirratulus sp., Cirriformia sp. and Aphelochaeta (Cirratulidae) and Prionospio sp. (Spionidae), which are considered as indicators of disturbed area. This results implied that the use of area for both polyculture and industrial activities may lead to environmental disturbance, thus environmental coastal management need to be applied in regular basis, both temporally and spatially.