Gastropod Species Diversity Research Articles

Gastropod Species Diversity in The Mangrove Bale Area of Poton Bako East Lombok

Gastropoda is a class with the biggest number of species, since a class of Mollusca phylum is generally effectively adjusted to different sorts of marine and freshwater territories to earthbound conditions. So a study was conducted on the diversity of Gastropoda species in the Bale Mangrove Poton Bako East Lombok area with the aim of knowing the types of gastropods that exist in the area. The method used in this study is the quadrat transect method. The results of research on the diversity of gastropod species in the Bale Mangrove Poton Bako East Lombok area found 6 species of Gastropoda including Cerithidea sp, Telebralia sulcata, Nerita undata, Telescopium telescopium, Chicoreus capucinus, Indothais gradate. The average diversity index value of the three stations is H′ = 1.41262991 which means that the diversity of Gastropods in the Bale Mangrove Poton Bako Area of East Lombok is moderate diversity.

Pola Distribusi Siput Air (Gastropoda) sebagai Bioindikator Pencemaran Air di Sungai Unus Kota Mataram dalam Upaya Pengembangan Modul Ekologi

Based on the results of preliminary observations on the Unus River, Mataram City, gastropods in each village which the river flows through have different characters according to the activities around the river and the level of river water pollution. So it is necessary to study the distribution patterns of water snails (Gastropoda) as bioindicators of water pollution in the Unus River, Mataram City in an effort to develop an ecological module. The aims of this study were (1) to find out how the distribution patterns of gastropods in the Unus river in Mataram City, (2) identify the types of gastropods found in the Unus River in Mataram city, (3) to reveal the dominant population of gastropods that dominate in the Unus river in Mataram city. , (4) analyzing the population density of Gastropods in the Unus river, Mataram City, (5) analyzing the diversity of Gastropod species in the Unus river, Mataram City, and (6) developing the results of research on Gastropod Distribution Patterns as a Bioindicator of Water Pollution in the Unus River, Mataram City in Module Development Efforts Ecology. This type of research is descriptive exploratory and developmental research for the development of ecological modules. The sampling technique used was purposive sampling technique and the length of the transect used was 30 m. Based on the results of the study, namely the highest morbidity index was the Thiara requenti species with a value of 0.253 which was in the regular category. Twelve species from 5 families were found, namely Pomacea canaliculata, Mellanoides plicaria, Apella demisum, Mellanoides puncata, Taribea granifera, Goniobasis virginica, Fillopaludina javanica, Thiara scabra, Thiara sp, Thiara requenti, Mellanoides tuberculata. The highest gastropod dominance population was owned by the Mellanoides plicaria species with a total of 0.48. The highest population density was occupied by the Thiara requenti species with a value of 7.3. the highest Gastropod species diversity level is located at station 2 with a value of 1.82. Based on the results of the validation and readability test of the ecological module, the average values ​​were 90 and 82.9 for the readability test. It was concluded that the module was very feasible to use.

Keanekaragaman Jenis Gastropoda di Pantai Kadahang Kabupaten Sumba Timur

The purpose of this study was to determine the diversity of gastropod species in Kadahang Beach, East Sumba Regency. This type of research is a quantitative descriptive using the Shannon-Wiener diversity index formula. Sampling using purposive sampling technique. Gastropod samples were counted using the quadratic transect technique with a size of 1 x 1 meter placed perpendicular to the inside of 50 meters using a plot of 30 plots. The environmental factors measured were temperature, salinity, and degree of acidity (pH). Measurements were made at two observation stations. The results showed that 10 species of gastropods were divided into 7 families, 10 genera and 5 orders, namely the orders Littorinimorpha, Archaeogastropoda, Neogastropoda, Trochida, and Cycloneritida with a total of 235 individuals. The types of gastropods found were Conomurex luhuanus, Lambis lambis, Gibberulus gibbosus, Canarium labiatum, Turbo chrysostomus, Cymbiola vespertifilio, Vasum turbinelus, Trochus maculatus, Blasicrura pallidula, and Nerita signata. The diversity index obtained is in the moderate category with a value of H' = 2.168.

Studi Spesies Gastropoda di Perairan Sungai Berumun

The aim of the Gastropod species study is to determine the diversity and density of Gastropods and the environmental conditions that influence the development of gastropods in berumun rivers. The research method used in this study of gastropod species is to provide descriptive information about the diversity of gastropod species in the Berumun river, Panai Hulu sub-district, Labuhan Batu district. The results of temperature measurements at the observation station in Sungai Berumun, Panai Hulu District, Labuhan Batu Regency, showed that the highest pH was at the third station, 7.40, while the lowest pH was at the first station, namely 7.1. From the results of the study, it was concluded that there are 15 species of macrozoobenthos found in the Barumun River which belong to 5 families, namely: 1. Potamididae, Cerithidae obtusa, Cerithidae alata, Cerithidae cingulata, Telescopium mauritsi, Telescopium telescopium, 2. Littorinidae, Littoraria melanostoma, Littoraria conica, Littoraria scabra, 3. Neritidae, Nerita balteata, Neritina violacea, Neritina cornucopia, 4. Muricidae, Stramonita gradata, Chicoreus capucinus, 5. Ellobiidae, Cassidula aurisfelis, Ellobium aurisjudae.
 Keywords: Gastropods, Diversity

Species Diversity of Gastropoda in Seagrass Ecosystems at Mandalika Beach

Madak is looking for or hunting marine biota that can be consumed or has high economic value. Madak's activities can still threaten the existence of species on Mandalika Beach, one of which is Gastropods. This research focuses on the diversity of gastropod species that live in seagrass beds at Mandalika Beach. This study aims to identify the abundance and analyze the diversity index, uniformity index and dominance index of gastropod species in seagrass ecosystems on the Mandalika coast. This type of research is included in the type of descriptive-explorative research. This study describes the diversity of gastropod species in seagrass ecosystems on Mandalika Beach. The testing procedure utilized purposive examining. The research was conducted at 3 stations with 3 transects at each station. The results showed 27 species and 15 families of Gastropods. The species abundance value was 0.796 ind/m2, the species diversity index value was 1.849, the uniformity index value was 0.686, and the dominance index value was 0.280.

Ecological Index of Freshwater Gastropod in Buton Island, Southeast Sulawesi

This research was conducted for 2 months (September-October 2021) and is located on Buton Island. The purpose of this study was to determine the diversity of freshwater gastropod species on Buton Island. Determination of the location for sampling gastropods using purposive sampling method (qualitative) and quantitative sampling using simple random sampling technique at locations that have been determined based on the presence of gastropods. Gastropod samples were collected manually (hand picking) using a paralone pipe (3.5 inches), Sieve (1 mm), and Gloves. The total number of gastropods obtained at 31 sampling locations on Buton Island was 4250. Buton Island gastropods consist of 24 genera and 55 species spread over 10 families, namely Achantinidae, Ampullariidae, Ariophantidae, Cyclophoridae, Lymnaeidae, Neritidae, Pachychilidae, Planorbidae, Thiaridae, and Viviparidae. The average abundance of gastropods reached 137,097 ind./m2 and the abundance of gastropod species ranged from 0.28-25 ind./m2. Overall, the results of the gastropod ecological index analysis showed a stable condition, where the diversity of gastropod species was categorized as high (H' = 3.31), moderate evenness (E = 0.83), high species richness (R = 6.46), dominance showed that there were no dominant species (C = 0.03) and the distribution of gastropods showed a clumped pattern (Ip = 0.02). The majority of Buton Island gastropod communities occupy rocky rivers and currents, a few of them live in artificial inland waters such as rice fields, embankments, dams/dams, and drainages and some are terrestrial snails.

GASTROPODE DIVERSITY IN LAKE TONDANO AREA, NORTH SULAWESI, INDONESIA

The diversity of gastropod species is influenced by different substrates, environmental conditions, and human activities, so it is necessary to research the diversity of gastropod species in Lake Tondano. This study aims to obtain data on the diversity of gastropod species that live around Lake Tondano. The study was conducted in May 2022. The collection of research data on the diversity of gastropods in Lake Tondano begins by dividing the research area into five stations. Each station forms a Line transect of about 50 meters x 10 meters. At each line transect, 10 points will be determined in a zigzag manner for observation and sampling. The determination of the sample is carried out by purposive sampling. The gastropod samples will be identified and then documented, and the number will be recorded. Gastropods found around Lake Tondano are Achatinidae (Achatina fulica), Station 1: -, Station 2: -, Station 3: 1, Station 4: 1, Station 5: 1. Ampullariidae (Pila Ampullacea), Station 1 :173, Station 2 : -, Station 3: 73, Station 4: 117, Station 5: 57. Potamididae (Tylomeliana toradjarum), Station 1: 321, Station 2:2, Station 3: 123, Station 4: 3, Station 5 :-. Viviparidae (F. Javanica/ Filopaludina Javanica), Station 1: 85, Station 2: 161, Station 3: 335, Station 4: 315, Station 5: 153. Based on these data, the highest index is at point 3, and the density index is at point 1.

Freshwater gastropod community in South Konawe District, Southeast Sulawesi, Indonesia

Abstract. Oetama D, Purnama MF. 2022. Freshwater gastropod community in South Konawe District, Southeast Sulawesi, Indonesia. Biodiversitas 23: 3364-3372. The freshwater gastropod population in South Konawe District, Southeast Sulawesi, Indonesia, consists of aquatic and terrestrial snail communities. This resource (gastropod) is an ecological and economic potential that needs to be maintained and utilized optimally and sustainably. This research was conducted in April-July 2021 and aimed to determine the ecological index of the inland gastropod community in the South Konawe District. The sampling location was determined qualitatively using the purposive sampling method and a simple random sampling technique (Quantitative based). Gastropod samples were collected manually (hand picking) with a paralon pipe (3.5 inches), Sieve (1 mm), and Gloves. The total gastropods obtained at 33 sampling locations in this district were 2635 individuals. The inland gastropods comprised 19 genera and 33 species spread over 9 families, namely Achantinidae, Ampullariidae, Ariophantidae, Lymnaeidae, Neritidae, Pachychilidae, Planorbidae, Thiaridae, and Viviparidae. The average abundance of gastropods reached 79.85 ind./m2 and the abundance of gastropod species ranged from 0.58-13.48 ind./m2. Overall, the analysis of gastropod ecology index showed a stable condition, where the diversity of gastropod species was categorized as high (H'= 3.03), moderate evenness (E= 0.87), and high species richness (R= 4.06). There were no dominant species (C= 0.08) and the gastropod distribution showed a clustered pattern (Ip= 0.02). These ecological index values indicated that the gastropod community in the inland waters of South Konawe District was in a stable condition. Although the gastropod community in the inland waters of the South Konawe District simultaneously has the same area as the invasive gastropod from the family Thiaridae, namely Melanoides tuberculata (O.F.Müller, 1774) and Tarebia granifera (Lamarck, 1816).

Ecological index of freshwater gastropods in Kolaka District, Southeast Sulawesi, Indonesia

Abstract. Salwiyah, Purnama MF, Syukur. 2022. Ecological index of freshwater gastropods in Kolaka District, Southeast Sulawesi, Indonesia. Biodiversitas 23: 3031-3041. Kolaka District is one of the existing centers of high freshwater gastropod diversity in Southeast Sulawesi Province, Indonesia. more than 30 species of inland gastropods occupy this area and some of them (species) are used by local communities as food (daily consumption). This research was conducted for 4 months, namely January-April 2021 in Kolaka District, Southeast Sulawesi, Indonesia. The purpose of this study was to determine the ecological index (abundance, diversity, evenness, species richness, dominance, and distribution pattern) of the inland gastropod community in Kolaka. The sampling location of gastropods was determined qualitatively using the purposive sampling method and sampling using a simple random sampling technique (Quantitative based). Gastropod samples were collected manually (hand picking) using a paralone pipe (3.5 inches), Sieve (1 mm), and Gloves. The total gastropod sample obtained during the study was 1929 individuals consisting of 9 families, 19 genera, and 33 species. The average abundance of the gastropod population reached 96.45 ind./m2 and the abundance of gastropod species ranged from 0.75-15.05 ind./m2. Overall, the results of the gastropod ecological index analysis showed a stable condition, where the diversity of gastropod species was categorized as high (H': 3.20), moderate evenness (E: 0.90), and high species richness (R: 4.23), dominant dominance. showed that there were no dominant species (C: 0.1) and the distribution of gastropods showed a clumped pattern (Ip: 0.01). Empirically the ecological index data is a scientific justification related to the sustainability of inland water ecosystems or a description of the current freshwater homeostasis system in Kolaka.

COMMUNITY STRUCTURE OF FRESHWATER GASTROPODS IN NORTH KOLAKA REGENCY SOUTHEAST SULAWESI

This research was conducted in January-March 2021 in North Kolaka Regency. The purpose of this study was to determine the structure of the freshwater gastropod community in North Kolaka Regency. This research applies a combination method (qualitative-quantitative) in determining the sampling location and sampling process. Determination of the sampling location using purposive sampling method based on the presence of gastropod communities and quantitative sampling using simple random sampling technique. Gastropod samples were collected manually using a metal hand scoop and gloves. The total gastropod sample obtained at 17 sampling points was 4250 individuals. The gastropod community structure in North Kolaka Regency consists of 19 genera and 33 species spread over 9 families, namely Achantinidae, Ampullariidae, Ariophantidae, Lymnaeidae, Neritidae, Pachychilidae, Planorbidae, Thiaridae and Viviparidae. The results of the analysis of the gastropod community structure showed a relatively stable condition, where the average abundance of gastropods reached 91.94 ind./m2 and the abundance of gastropod species ranged from 0.29-16 ind./m2. Gastropod species diversity was categorized as moderate with a maximum value (H' = 2.96) or close to H'>3 (high category), moderate evenness (E = 0.85), high species richness (R = 4.35), dominance which showed that there was no dominant species (C = 0.08) and the distribution of gastropods showed a clustered pattern (Ip = 0.01). The freshwater types in North Kolaka Regency are generally rocky rivers so that the gastropod community is dominated by the Neritidae and Thiaridae families, especially the Tarebia granifera, Melanoides tuberculata and Clithon corona.

Diversity of Gastropod Types in Mangrove Forest Jatipapak Resort Kucur Alas Purwo National Park

Background: Research related to the existence and diversity of Gastropod species in the Alas Purwo National Park is still very minimal, especially in mangrove forests. The purpose of this study was to determine the diversity of gastropods in the mangrove forests of Jatipapak Resort Kucur, Alas Purwo National Park. Methods: This study was conducted from April to December 2020. The method used was purposive sampling by following systematic transects of mangrove vegetation. Results: The results of the research obtained were 420 Gastropods belonging to 6 tribes, 11 genera, and 14 species. The diversity of Gastropods in the mangrove forests of Jatipapak TN Alas Purwo is in the moderate category, this is indicated by a value of 1.966 and the similarity of Gastropods is quite evenly distributed with a value of 0.745. Conclusion: Based on these results, the most common species found was Nerita articulata, while the least species found was Ellobium aurisjudae.

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.

Analysis of Gastropod Diversity as a Bioindicator of Waters in Situ Ciburuy Padalarang, West Bandung Regency, West Java, Indonesia

This study conducted to determine the water quality of Situ Ciburuy based on the structure of the gastropod community as a bioindicator. The survey method used in this study based on collecting data directly at the research area (purpose sampling method). For instance, species and density of gastropods were descriptively analyzed, using diversity index and evenes index. For instance, The findings showed that level of water quality in Situ Ciburuy based on gastropods bioindicators was lightly polluted. That is indicated by the low to moderate diversity of gastropods, which ranges from 1.31-1.98. The Shannon evenness index (0,73-0.95) revealed low gastropod species diversity in Situ Ciburuy, indicating low evenness of gastropod in Situ Ciburuy.

Association patterns of seagrass with gastropods types in the intertidal zone of coastal waters, Suli village, Salahutu district, Ambon island

Seagrass beds play an important role in coastal aquatic ecosystems and are one of the tidal areas that are widely used by the community as a forum for the interests of educational institutions in research activities, conservation of various marine biota. Ecologically, the seagrass ecosystem acts as a shelter and a place to eat various marine biota, including gastropods. The purpose of this research is not only to explore the diversity of gastropods, but also to examine the interactions of gastropod species, both between the same species and between different species in a community of seagrass ecosystems. The diversity index calculation shows the diversity index value H = 3.982 > 3, this means that the diversity of gastropod species is quite good. The results of the basic analysis obtained the calculated X2 value of 0.656, > X2 table with a significant level of 0.05%. There is an association relationship between seagrass ecosystems and the types of gastropods that live in seagrass ecosystems in coastal waters of Suli Village, Ambon. 
 
 Keywords: Gastropods, Seagrass meadows, Association

Diversity of gastropods epifauna based on substrate in littoral zone in Mesjid Raya, District of Aceh Besar, Indonesia

The gastropod is one class of the Mollusca phylum using the abdomen as the leg. Generally gastropods are crawling on the bottom of the waters and submerged in the mud and are often called epifauna and infauna gastropods. Research on diversity of epifauna gastropods in the littoral zone has been done in Mesjid Raya, Aceh Besar District. This research aims to determine the diversity of gastropod species based on the substrate types (coral reef, muddy and sandy). The exploratory method by using transect line was used in this study. In each substrate, a line transect was drawn for five transects with a length of 50 m. The transects were started from the tidal line. The distance between transects were 50 m. Each transect was made in 10 sampling plots measuring lm × lm, and the distance between plots was 5m. The gastropods were collected directly and without damaging the substrates. The epifauna gastropods obtained was put into a sample bottle and preserved using 70% alcohol. The results showed that 23 families and 54 species of epifauna gastropods were identified. The number of species of gstropods was found in the sandy and muddy substrate more than in the sandy and corral reef substrate, but the highest diversity index was found in the sandy substrate, meanwhile the lowest diversity was found in the coral reef substrate. The highest species density was obtained on Rhinoclavis aspera.

KEANEKARAGAMAN JENIS GASTROPODA DI HUTAN MANGROVE DESA MENDALOK KECAMATAN SUNGAI KUNYIT KABUPATEN MEMPAWAH

Gastropod is a single-shelled animal that walks using stomach for their legs. Mangrove forest located Mendalok village, Sungai Kunyit sub-district, Mempawah district have pristine mangroves whose function is still maintained and is natural. The purpose of this study was to examine the diversity of Gastropoda species in Mendalok the area. Data retrieval the diversity of Gastropod species, the researchers empolyed a purposive sampling method that making each zone used 3 lines observation of each one line transect. While the three observation tracks consist of the Avicenia zone, Rhizopor zone, Bruguiera zone. The number of Gastropod individual found was 367 with 5 families and 8 species (Cerithideopsilla alata, littorina obstutata, Littorinopsis anguliferis, Littoraria melanstoma, Graciliclva costata, Casidulla aurisfelis, Ellobium aurisjudae, and Lirttoraria undulata). The research found diversity indexes in Avicennia zone = 2,98, Rhizopora zone = 3,05 and Bruguiera zone = 1,16. Especially, the highest density is in the type of Gastropod Littoraria undulata. Additionally, the dominant index is found in the Avicenia zona = 0,8562, the Rhizopora zone = 0, 5410 and Bruguiera zone = 0,4585. While the low similarity index exist in both Bruguiera zone = 28,77 % and Avicenia zone = 28,50%, and the index of type similarity is at the value of 0,1117.Keyword: Ecotourism of mangrove, Gastropods, mangrove forests.

Gastropoda di Perairan Budidaya Rumput Laut (Eucheuma sp) Kecamatan Suppa Kabupaten Pinrang

Abstract. Indonesia has a high diversity of marine life, including gastropods. The distribution of gastropods varies in various locations at sea such as at the location of seaweed cultivation in Suppa Regency. These types of gastropods have not been identified even though the public knows the benefits of this organism. Therefore, efforts are needed to inventory these types of gastropods. The purpose of this study was to determine Gastropods living together in seaweed aquaculture locations (Eucheuma sp) in Suppa District. This research uses free roaming techniques along the seaweed cultivation location. The population is all types of gastropods that live together in seaweed farming locations. Samples are types of gastropods found at seaweed farming locations. Samples of abiotic and biotic factors along seaweed farming locations are also recorded as supporting inventory data. Gastropods were found there were 9 (nine) types that came from 8 (eight) genera, 5 (five) families. There are 3 species found in all sampling points, namely Cerithidea cingulata, Terebralia sulcata, and Terebralia palustris. Species found in certain locations and not found in other locations are Telecospium telecospium, Faunus ater, Rhinoclavis vertagus, Strombus microurceus, Nerita insculpta, and Monodonta labio. The suggestion of this research is to periodically observe the diversity of gastropod species in seaweed cultivation locations to determine patterns of interaction between organisms and the environment that occur seaweed cultivation locations.Keywords: gastropods, seaweed, pinrang district

Komposisi Gastropoda di Hutan Mangrove Pulau Sepok Keladi Kabupaten Kubu Raya Kalimantan Barat

Gastropods are an invertebrata which has an important role as an indicator quality mangrove forest. The presence of Gastropods in Sepok Keladi mangrove forest was decreasing due the habitat degradation and it impact on the Gastropods community. The purpose of this research is to determine the diversity of Gastropod species in mangrove forest Sepok Keladi Island Kakap River District Kubu Raya Regency. This study uses purposive random sampling method at six different stations with two 5x5m2 size plots in each station and four replication. The study found four families of Gastropods, i.e. Ellobidae, Littorinidae, Neritidae and Potamidiidae. Epifauna Gastropods found nine species and are five of them are treefauna. The most species foundy Cerethidae obtusa from Potamididae family.

KEANEKARAGAMAN JENIS GASTROPODA DI SUNGAI JANGKOK KOTA MATARAM SEBAGAI DASAR PENYUSUNAN PETUNJUK PRAKTIKUM EKOLOGI

Gastropoda included in the Mollusca phylum. Gastropoda are commonly found in watersheds. Jangkok River is a watershed that flows from the mountains of West Lombok Regency across Mataram City and interacts the most with human activities. This study aims to: 1) identify the type of Gastropoda found in the Jangkok River, Mataram City; and 2) developing research results on the diversity of Gastropod species in the Jangkok River in Mataram City as the basis for the Formulation of Ecology Practicum Guidelines. This type of research is exploratory descriptive research and development research. Descriptive research analyzes only to the level of description that is to analyze and present data systemically, so that it can be more easily understood and concluded, and exploratory research is a type of research that aims to find something new in the form of a grouping of symptoms, facts and certain diseases. While development research is an attempt to develop an effective product for use by schools and colleges, and not to test theory. Data collection techniques used for descriptive exploratory research are observation and documentation, while for development research are validation, legibility testing, and documentation. The data analysis technique was using species diversity index and percentage technique. The results showed that there were 51 Gastropod individuals consisting of 7 species that have been found including Potamopyrgus antipodarum, Mya arenaria, Ilyanasa aobsoleta, Pomacea canaliculata, Pomace ainsaluran, Poamarcobula amurensis, and Melanoides punctata. Species diversity at the upstream station has a very low diversity index with a value of 0, the middle station has a diversity index with a value of 0,91 indicating low diversity, and downstream stations have a diversity index with a value of 1,29 indicating moderate diversity. The average value of the validation test for practicum is 80,6%, and the readability test for students is 81%, with these results the practicum instructions that have been prepared are in the very valid category and do not need to be revised.

Distribution Patterns and Habitat Requirements of Freshwater Snails in Man-Made Ponds

The study was carried out to understand the factors that affect community structure and generate heterogeneity in gastropod species diversity in various types of man-made ponds (e.g., subsidence ponds, sand pits and fish ponds at forested and non-forested locations). The studied waterbodies differed in water chemistry, bottom sediment type, source and drainage of water and in terms of snail occurrence patterns. Differences in gastropod species composition were related to differences in bottom sediments and water chemistry. Two-way indicator species analysis split the clusters into four groups with respect to substratum type and location. Forest ponds were important for the gastropod diversity and specifically for Planorbidae species.