Cerithidea Cingulata Research Articles

Bioaccumulation of heavy metals in water and mollusks in the Karnafully estuary: Potential human health risk and environmental contamination

This study investigates the bioaccumulation of heavy metals lead (Pb), cadmium (Cd), copper (Cu), and chromium (Cr) in water and mollusks across the Karnafully River estuaryof Bangladesh. Samples were collected from six different sites encompassing diverse ecological conditions over three seasons: monsoon, post-monsoon, and winter. Six mollusk species were analyzed using atomic absorption spectrophotometry to quantify metal concentrations in both tissues and shells. These species are Neritina violocea, Neritina sulculosa, Telescopium telescopium, Cerithida ecingulata, Corbicula fluminea, and Bellamya bengalesis. The Chaktai canal site had the highest concentration of Cu (13.99±0.92 mg/kg) from the mussel species B. Bengalesis during monsoon season, which was higher than the tolerable limit for human. The the lowest concentration of Cu (1.13±0.76 mg/kg) from the composite mussel species N. sulculosa were fround from the 15 No. Jetty site in winter.. The highest concentration of Cr was found at the Marine Academy site (0.54±0.24 mg/kg) during the post-monsoon period from the mussel species N. violocea, while the lowest concentration was found near the Karnafully Bridge (0.05±0.02 mg/kg) during the monsoon from the mussel species Cerithidea cingulata. The highest concentration of Cd was observed in the Chaktai canal site (0.77±0.04 mg/kg) during the winter from the B. bengalesis, and the lowest concentration was recorded in the Karnafully Bridge (0.33±0.06 mg/kg) site during the winter season from the Cerithidae cingulata species. The highest amount of Pb was found in Chaktai canal site (0.32±0.06 mg/kg) during the monsoon season in B. bengalesis fuana. The lowest amount was found in Karnafully Bridge (0.09±0.02 mg/kg) in the Cerithidae cingulate species at the same time. The results suggested that the possibility of the occurrence of acute toxicities of Cu, Cr, Cd and Pb was unlikely except for the mussel of T. telescopium in the Marine Academy that indicates heavy metals presence at the Marine Academy site. The study revealed that the average concentrations of the heavy metals were in the order of Cu>Cd>Cr>Pb in the monsoon, postmonsoon, and winter seasons. The principal Component Analysis (PCA) highlighted distinct seasonal patterns in metal accumulation, underscoring the need for seasonal-specific monitoring and management strategies in estuarine ecosystems.

Molecular Identification and Biotechnological Potential of Cerithidea cingulata-and Lottia scabra Associated Fungi as Extracellular Enzyme Producer and Anti-Vibriosis Agent

Mangroves are complex, unique, and dynamic ecosystems that host organisms that have special physiological adaptations to fluctuations in salinity, temperature, and pH. Gastropods have an important role in the mangrove ecosystem for food cycles and webs by helping to provide nutrients and micro-habitats for microbes. Micro-fungi isolated from mangrove ecosystems are productive sources of enzymes and bioactive compounds such as antibacterial and antifungal. In this study a explored the enzymatic and anti-vibrio activity of fungi associated with the marine gastropod Cerithidea cingulata and Lottia scabra. collected in three mangrove forests in North Sulawesi, Indonesia. The fungi associated with the specimens were inoculated on malt extract agar (MEA) using the tapping method. Enzymatic and anti-vibrio assays were conducted applying the plug method. Positive effects of the fungal compounds on Vibrio were indicated by clear zones formed around the isolates. A total of 13 fungal species were isolated from C. cingulata (19MB-C5 and 19MBa-A4) and L. scabra (19MT-07 and 19MT-18). Most fungal isolates have moderate growth rate. The isolate with highest cellulolytic, proteolytic, and anti-vibriosis activity (Vibrio parahaemolyticus, V. harveyi, V. vulnificus, and V. alginolyticus), derived from C. cingulata 19MB-C5 was closely related to Aspergillus niger, as revealed by molecular analysis using the universal primers ITS1 and ITS4 (similarity value 99%). A. niger 19MB-C5-3 has potential as a bioremediation and anti-vibrio agent that can be applied in aquaculture.

KEANEKARAGAMAN JENIS GASTROPODA PADA EKOSISTEM HUTAN MANGROVE DI DESA SENTEBANG KABUPATEN SAMBAS KALIMANTAN BARAT

Gastropods are a single shell mollusk phylum. Gastropods have a really significant function, particularly in the mangrove ecosystem. Mangrove forests are a very supportive habitat for gastropods. Gastropods have a very important role in the processof decomposing litter and maintaining nutrient dynamics in mangrove forests. This study aims to obtain and analyze data on the diversity of gastropods in the mangrove forest ecosystem in Sentebang Village, Jawai District, Sambas Regency. The research wasconducted in June 2020 using survey methods and data collection techniques using purposive sampling. Based on the results of the research that has been done, it was found that there were 11 types of gastropods from 5 families. The types of gastropods found were Nerita violacea, Cerithidea obtusa, Cerithidea cingulata, Littoraria melanostoma, Littoraria scabra, Littoraria angulifera, Pythia plicata, Ellobium aurisjudae, Cassidula nucleus, Cassidula aurisfelis, Spherassiminea miniata. The gastropod diversity index in line 1 = 1.2246, line 2 = 0.8689, and line 3 = 0.9554. Track 1 is in the medium category, for lines 2 and 3 it is in the low category. The overall diversity index is 1.6239 which is in the medium category. The similarity index for the types of gastropod lines 1 and 2 = 40%, lines 2 and 3 = 25%, lines 1 and 3 = 20% which are included in the low category. Abundance index of gastropod type line 1 = 21.8, line 2 = 5.3, line 3 = 5.1. The evenness index of the gastropods line 1 = 0.6834, line 2 = 0.6268, line 3 = 0.6892. The overall evenness index is 0.6772 which is categorized as an unstable community. The gastropod dominance index line 1 = 0.3684, line 2 = 0.5186, line 3 = 0.4748, line 1 and 3 are in the low category, while line 2 is in the high category. The overall dominance index is 0.2574 which is in the low category, meaning that no type dominates. Based on the data that has been obtained, it can be concluded that the diversity of gastropods in the mangrove forest ecosystem in Sentebang Village, Jawai District, Sambas Regency is classified as moderate.Keywords: Gastropods, mangrove forest, species diversity

Developing and application to the fishing industry with the internet of thing (IoT)

Abundance of three coexisting gastropod species (Cerithidea cingulata, Cerithium coralium and Batillaria zonalis) in the lagoon area of Setiu Wetlands, Terengganu, Malaysia

Abundance of three coexisting gastropod species (Cerithidea cingulata, Cerithium coralium and Batillaria zonalis) in the lagoon area of Setiu Wetlands, Terengganu, Malaysia

Abundance of three coexisting gastropod species (Cerithidea cingulata, Cerithium coralium and Batillaria zonalis) in the lagoon area of Setiu Wetlands, Terengganu, Malaysia

Komposisi Jenis dan Distribusi Gastropoda pada Ekosistem Mangrove di Pulau Tunda, Kabupaten Serang Banten, Jawa Barat

Tunda Island is one of a group of islands located in the northern area of Banten Province. In the eastern and southern parts of Tunda Island, there is a mangrove ecosystem which is a habitat for various organisms, one of which is gastropods. In the mangrove ecosystem, some gastropods live on the roots, stems, and leaves of mangroves by sticking and climbing, clinging to dead wood, to the muddy ground. It is necessary to know the type composition and distribution of gastropods in the mangrove ecosystem found on Tunda Island, Serang Regency, Banten. Gastropod sampling was carried out on a 5 x 5 m2 plot at the lowest tide. All types of gastropods found in the plots were taken by hand. The gastropod samples obtained were then cleaned and put in a sample bottle, then given a 70% alcohol solution as initial preservation for further identification at the Laboratory of Dry Hydrobiology, Marine Science and Technology, FPIK, Bogor Agricultural University. There are 19 types of gastropods found in the mangrove ecosystem of Tunda Island from 11 families, including: Cerithidea cingulata, Telescopium telescopium, Terebralia sulcata, Terebralia palustris, Cerithium kobelti, Chicoreus capucinus, Coralliophila persica, Littoraria scabra, Mitrella puella, Xenorita plana. indica, Clea helena, Morula biconica, Phos senticosus, Fissilabia decollate, Monodonta canalifera, Imbricaria vanicorensis. Based on the index value of the diversity index (H') (0.06 – 0.21 < H'< 2.0), dominance (D) (0.03 – 0.19 < D<0.50) and uniformity (E) (0.03–0.13) obtained, the gastropods found in the mangrove area on Tunda Island with a low level of diversity.

IDENTIFIKASI JENIS GASTROPODA DI HUTAN MANGROVE DESA SUTERA KECAMATAN SUKADANA KABUPATEN KAYONG UTARA

The mangrove forest in Sutera Village is a mangrove tourism forest located in Sukadana District which has an important role as a place of care, foraging and spawning for various types of animals such as crustaceans, fish and gastropods. Gastropods are soft-bodied animals that have a shell on the outer part of the body used to protect themselves from danger or predators. This study aims to identify the types of gastropods in the mangrove forests of Sutera Village, Sukadana District, Kayong Utara Regency. The results showed that in the mangrove forests of Sutera Village, Sukadana District, Kayong Utara Regency, 403 individuals consisting of 20 species and 7 families were found. The types of gastropods were Ellobium aurisjudae, Ellobium gangeticum, Cassidula nucleus, Cassidula aurisfelis, Ellobium aurismidae, Cerithidea quadrata, Cerithidea quoyii, Cerithidea cingulata, Cerithidea alata, Cerithidea obtusa, Chicoreus capucinus, Indothais gradata, Littoraria scabra, Littoraria melanostoma, Littoraria cingulata, Littoraria carinifera, Natica gualteriana, Nerita balteata, Neritina cornucopia and Onchidium sp. Keywords : Identification, Gastropods, Mangrove Forest

Jenis-Jenis Gastropoda di Pesisir Muara Kintap

The typesof gastropods on thecoast of Muara Kintap will be carried out from August to December 2021. Gastropods are the largest group in the mollusca phylu, these animals are widely distributed in coastal marine areas, one of wich in on the coast of Muara Kintap. The coastal area is a natural habitat for gastropods. Line transect method was used to collect gastropod samples, namely; plot and take the gastropods inside. Gastropods faound 14 species, namely: Conus raulsilvai, Hexaplex trunculus, Hyalina pallida, Telescopium telescopium, Turitella communis, Turitella terebra L., Nucella lapillus, Naria eburnea, Nassarius phrrhus, Nassarius limmatus, Oliva trigidella oriolla, Cerithidea cingulata, Gibbula leucophea, Polinice didyma.

Keanekaragaman Jenis Gastropoda di Hutan Mangrove Desa Ranga-Ranga Kecamatan Masama Kabupaten Banggai

Gastropods are one of the biological natural resources that have high diversity in the mangrove ecosystem. The purpose of this study was to determine the diversity of gastropod species in the mangrove forest of Ranga-Ranga Village, Masama District, Banggai Regency. This type of research is descriptive quantitative. The research was conducted from August to September 2020 in the mangrove forest of Ranga-Ranga Village. The data collection technique used a 100 m perpendicular line transect, then along the line transect there were 5 plots with a size of 10 m x 10 m, and the distance between plots was 10 m. Data collection was carried out once in each plot. The data analysis technique used the Shannon-Wienner diversity index analysis. The results showed that there were 7 species of gastropod found, namely: Telescopium telescopium, Faunus ater, Ellobium aurisjudae, Neritina sp., Cerithidea cingulata, Cassidula aurifelis, and Chicoreus capucinus. The results of the calculation of the gastropod diversity index in plot I are 1.35086, plot II is 1.48419, plot III is 1.50932, plot IV is 1.51415, and plot V is 1.45345, with a total diversity index of 1.419058. This shows that the index of gastropod diversity in the mangrove forest of Ranga-Ranga Village, Masama District, Banggai Regency is included in the medium category.

Metal accumulation and biomineralisation of coastal and mangrove-associated molluscs of Palk Bay, Southeastern India

The present study aimed to determine metal accumulation levels in tissue and biomineralisation in shells of 20 species of molluscs (13 gastropods and 7 bivalves) from Palk Bay, India. In most cases, metal concentrations in the tissues were higher than in the shells of the same species collected from same location, meaning that in many cases biomineralisation factors of metal ratios were <1. The highest biomineralisation factor for Cd was detected in Melampus sincaporensis (3.72 ± 0.1) from the Thondi mangrove, for Pb in Cerithidea cingulata (2.51 ± 0.17) from the Vattanam mangrove, for Cu in Melampus sincaporensis (0.88 ± 0.2) from the Thondi mangrove, and for Zn in Cerithidea cingulata (0.93 ± 0.3) from the Devipattinam mangrove. In most cases, metal concentrations were higher than reported in previous studies but were within the maximum limits stated by national and international regulatory agencies. Variations in the biomineralisation factor of metal ratios among the molluscan species likely stems from variations in bioaccumulation efficiency, selectivity of individual organisms, and availability of metals in the mangrove and coastal environments.

Spatial Zonation and Diversity of Bivalves and Gastropods in Mangrove Forests of Casiguran, Aurora

This study generally aimed to determine the spatial zonation and diversity of bivalves and gastropods in mangrove forest of Cozo, Esteves and Tinib in Casiguran, Aurora. Specifically, this aimed to determine the species composition and distribution, and determine the relationship between spatial zonation and diversity of bivalves and gastropods as influenced by ecological factors such as vegetation, soil texture, organic matter, soil salinity, and soil pH. A total of 22 taxa comprising eight species of bivalves and 14 species of gastropods were identified. The high tidal zone of Esteves had high diversity (0.66) of bivalve species compared to other tidal zones and areas. On the other hand, the diversity of gastropods was almost equal in the middle tidal zones of Cozo (0.60), Esteves (0.57), and Tinib (0.42). In terms of bivalve species’ density and abundance, Dendostrea folium was the most dense and abundant in the low tidal zone of Cozo (253,333 ind.ha−1 or 25 ind.m2-1, 97.44%) while Gafrarium tumidum in the low tidal zones of Esteves (46,666 ind.ha−1 or 4 ind.m2-1, 73.68%) and Tinib (126,666 ind.ha−1 or 12 ind.m2-1, 50%). In terms of gastropod species’ density and abundance, Cerithidea cingulata was the most dense and abundant in the low tidal zone (666,666 ind.ha−1 or 66 ind.m2-1, 65.79%) of Cozo and the middle tidal zone (5,280,000 ind.ha−1 or 528 ind.m2-1, 61.40%) of Tinib. It was Terebralia palustris in the low tidal zone (1,263,333 ind.ha−1 or 126 ind.m2-1, 63.06%) of Esteves. All tidal zones within each study area had greater dissimilarities in terms of bivalves but had greater similarities in terms of gastropod species’ compositions. On the other hand, all tidal zones between study areas had greater dissimilarities in terms of bivalve and gastropod species present. Most tidal zones had Gafrarium tumidum as common bivalve species while Neritidae sp. and Cerithidea cingulata were common gastropod species. All these species were found thriving in a wide range of vegetation, soil texture, organic matter, soil salinity and pH.

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.

Biodiversity in Mangrove-derived Aquaculture Ponds in Dumangas, Iloilo, Philippines

Large tracts of mangroves have been converted into aquaculture ponds and the consequent loss of biodiversity has been much decried. This paper shows that high aquatic biodiversity is retained in mangrove-derived aquaculture ponds in Dumangas, Iloilo, Philippines. Documentation of biodiversity was carried out over two years in 15 adjacent ponds (water areas 0.25–0.9 ha) used for farming penaeid shrimps, mud crabs, milkfish, seabass, rabbitfish, and other fishes. At harvest, these ponds yielded many extraneous non-crop or “bycatch” species, which had been naturally seeded by the tides and had grown (and some species reproduced) over the 2–10 mo that the ponds were underwater. From 21 crop cycles were obtained 8–56 species (from 6–30 taxonomic families) of bycatch fishes and macrocrustaceans with biomass of 2.5–168.4 kg ha–1 and abundance of 2–92 x 103 individuals ha–1, the differences due to pond area, duration of immersion, farming system, crop species, and the bycatch community. Some 85 species (44 families) of fishes occurred in the ponds, including 12 species of gobies, of which the small-size Acentrogobius viganensis, Pseudogobius javanicus, Mugilogobius cavifrons, and Gobiopterus panayensis reached high abundance. Macrocrustaceans consisted of 30 species (nine families), including several penaeid and palaemonid shrimps (Metapenaeus ensis and Nematopalaemon tenuipes were most common) and portunid and grapsid crabs. Mollusks in the ponds included 58 species (24 families), of which Cerithideopsilla cingulata was most abundant. The Dumangas ponds were leaky and allowed tidal recruitment of many mangrove animals despite net screens and chemical treatments. Existing tidal ponds serve as proxy mangrove lagoons (wetlands) that can harbor high aquatic biodiversity.

KELIMPAHAN BAKTERI COLIFORM PADA Cerithidea cingulata SEBAGAI INDIKATOR PENCEMAR DI PERAIRAN KAMAL KABUPATENBANGKALAN

Colifrom bacteria are a group of microorganisms commonly used as indicators of water pollutants to determine whether water or waters have been contaminated by pathogenic bacteria or not. This study aims to determine the parameters of water quality in Kamal waters, to determine the presence of colifrom bacteria in Kamal waters and to determine the abundance of colifrom bacteria. The sample used in the study was Cerithidea cingulata. Sampling was carried out in 3 location points, each of which had 5 plots for taking Cerithidea cingulata. Analysis of colifrom bacteria was carried out in three stages, namely the estimation test, confirmation test and colifrom MPN calculation. Based on the National Standardization Agency and SNI 7388: 2009, the maximum limit of coliform MPN values is &lt;3MPN / g. On the location of Kamal Poron Stone can be seen the abundance of bacteria in Cerithidea cingulata between &lt;3-15 MPN / g. whereas at the East Port location, Kamal can be selected for bacterial abundance in Cerithidea cingulata. between 3.6 - 35 MPN/g. and at the Kamal Climb location can be seen the abundance of bacteria in Cerithidea cingulata. between 3 -&gt; 1100 MPN / g, it is suspected that Kamal waters exceed the quality standard, which is &lt;3MPN / g. Keywords: Coliform bacteria, Cerithidea cingulata, Bioindicator, Pollution ABSTRAK Bakteri colifrom merupakan golongan mikroorganisme yang lazim digunakan sebagai indikator pencemar perairan untuk menentukan air atau perairan telah terkontaminasi oleh bakteri pathogen atau tidak. Penelitian ini bertujuan untuk mengetahui parameter kualitas air diperairan kamal, untuk mengetahui adanya bakteri colifrom pada perairan Kamal dan untuk mengetahui kelimpahan bakteri colifrom. Sampel yang digunakan pada penelitian yaitu Cerithidea cingulata.Pengambilan sampel dilakukan 3 titik lokasi, setiap titik lokasi terdapat 5 plot untuk pengambilan Cerithidea cingulata.Analisa bakteri colifrom dilakukan dengan tiga tahap yaitu uji pendugaan, uji konfirmasi dan perhitungan MPN colifrom. Berdasarkan Badan Standarisasi Nasional dan SNI 7388:2009 mengatakan bahwa batas maksimal nilai MPN coliform yaitu &lt;3MPN/g. Pada lokasi Batu Poron Kamal dapat dilihat kelimpahan bakteri pada Cerithidea cingulataantara &lt;3 – 15 MPN/g. Sedangkan pada lokasi Pelabuhan Timur Kamal dapat dilihan kelimpahan bakteri pada Cerithidea cingulata.antara 3,6 – 35 MPN/g. dan pada lokasi Tanjungan Kamal dapat dilihat kelimpahan bakteri pada Cerithidea cingulata.antara 3 - &gt;1100 MPN/g maka diduga perairan Kamal melebihi batas baku mutu yaitu &lt;3MPN/g. Kata Kunci : Bakteri Coliform, Rhinoclavis sordidula, Bioindikator, Pencemaran

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

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.

Effects of non-indigenous plants on food sources of intertidal macrobenthos in Yueqing Bay, China: Combining stable isotope and fatty acid analyses

Plant invasions in coastal ecosystems may substantially alter benthic community composition and food web structure. We combined analyses of stable isotopes and fatty acids (FA) to examine the effects of two non-indigenous plants (Spartina alterniflora and Kandelia candel) on the food sources of three deposit feeders (Assiminea brevicula, Cerithidea cingulata and Uca arcuata) and a carnivorous opportunistic predator (Periophthalmus modestus) in Yueqing Bay, China. A wide range of differences was found in δ13C and δ15N among the macrobenthos. The deposit feeders in K. candel mangrove forest (KC) were markedly more 13C-depleted than those in S. alterniflora marsh (SA) and unvegetated tidal flat (TF), unlike the carnivorous feeder. PERMANOVA showed that FA composition significantly differed among the macrobenthos. Diatom FA markers were higher in tissues of the deposit feeders than in the carnivorous feeder, and slightly lower in macrobenthos from the KC and SA habitats as compared with the TF. In contrast, vascular plant FA markers of macrobenthos were higher in the KC and SA than in the TF, indicating the contribution of mangrove and Spartina detritus to the consumers. The findings show that the food sources of macrobenthos were markedly affected by non-indigenous plants, through the addition of organic detritus derived from vascular plants in the diets together with a decreased contribution of diatoms, although the impacts may differ among different functional feeding groups of macrobenthos.

The composition of mollusks in mangrove ecosystem conservation area Bagek Kembar, West Lombok

Mangrove association mollusks was one of the indicator to describe the status of mangrove ecosystem’s health. This research aimed to analyze the condition of mangrove rehabilitation based on the composition of association mollusks compared with non-rehabilitation area which resulted from a natural succession. It held on July 2019 at mangrove conservation area Bagek Kembar, West Lombok. Data collection method used stratified random sampling by placed some plots sized 1x1 m randomly in a larger plot (10x10 m) which have been determine randomly before. The result showed that there are 24 species of association mollusks which belong to 11 families found in these area. The abundance of mollusks in natural and rehabilitation mangrove was different which is in a row 50.2647 ind/m 2 and 88.4 ind/m 2. Cerithidea cingulata has the highest abundance among the other species with the number of abundance 48.8 ind/m2 in non-rehabilitation ecosystem and reach 29.17 ind/m 2 in rehabilitation area. Based on this research, the condition of mangrove conservation Bagek Kembar still categorized as non-stable condition for supporting the survival of mangroves associated mollusks.

Assessment of environmental status of coastal mangrove area using macrobenthic assemblages: a study case at Tapak Mangrove area, Semarang, Central Java

Macrobenthic structure can be used as a bioindicator in determining the level of disturbance in water ecosystem through their composition, presence or absence spatially and temporally as apart of ecological management. Tapak is a coastal area of Semarang City, Central Java, Indonesia that has potency as an ecotourism area for integrated aquaculture at mangrove area. On the other hand, industrial activity around Tapak coastal area may lead to a degradation of the ecological function of that area. This study aims to assess environmental status at Tapak Mangrove Area through the macrobenthic structure in space and time. Purposive random sampling method was applied, consisting five sampling stations with 3 replicates between March to May 2018. Sediment samples were taken by using Ekman grab and were analyzed through the stages of fixation, rinsing, sieving, preservation, sorting, identification, and enumeration. The biotic parameters observed were the macrobenthic community structure, including species composition, abundance, and diversity, evenness, and dominance indices. Physico-chemical parameters of the water and sediment were measured every month. The Early Warning System (EWS-3SWJ) software was used to assess the level of environmental disturbance at each station. The total of 15 species of macrobenthic assemblages were found. The most common species were Telescopium telescopium, Cerithidea cingulata, and Metapenaeus sp.. The diversity of macrobenthos was considered low at all sampling stations (H’ = 0,56 – 1,52), with marked variability in dominant taxa (D = 0,21 – 0,71). Further analysis using the EWS-3SWJ showed that the environmental status of the Tapak Mangrove Area is categorized as slightly disturbed areas.

Species Richness and Abundance of Bivalves and Gastropods in Mangrove Forests of Casiguran, Aurora, Philippines

The diversity and abundance of bivalves and gastropods were studied from April to July 2015. Two sampling stations, Tinib and Esteves, in Casiguran, Aurora were selected based on the presence of mangrove forest, bivalves, gastropods, muddy substrate, and gleaners for the establishment of a transect line. Each station was laid with 100 meters transect line overlaid continuously with 2 m × 2 m quadrat along each transect. A total of 50 sampling units covering 0.02 ha area per sampling station were surveyed. The transect line recorded six species of bivalves distributed among five families and 12 species of gastropods belonging to eight families. Three species of bivalves and five species of gastropods were common to both sampling stations. However, Tinib station had most diverse species of bivalves (0.55) while Esteves station had most diverse species of gastropods (0.43). Both stations revealed Dendrostrea folium (43%) (bivalve) and Cerithidea cingulata (93%) (gastropods) as most frequently occurring species. Dendostrea folium also emerged as the densest (10,640 ind∙ha−1 and 6850 ind∙ha−1) and most abundant (58.52% and 77.84%) bivalve species. For gastropods, Terebralia sulcata (249,250 ind∙ha−1) was the densest and most abundant (96.97%) in Tinib while Terebralia palustris was the densest (747,050 ind∙ha−1) and most abundant (70.44%) in Esteves. Pooled results for bivalve species maintained Dendrostrea folium as the densest (8750 ind∙ha−1) and most abundant (64.81%). However, for gastropods, Terebralia palustris emerged as the densest (373,525 ind∙ha−1) and most abundant (56.70%) species. The mangrove forests of Casiguran, Aurora thus contain a variety of bivalves and gastropods with Tinib station dominated by bivalves while Esteves station dominated by gastropods.

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 &amp; Rhizophora), and Avicennia &amp; 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.