Equitability Index Research Articles

English

The purpose of this study is to evaluate the viability of wildlife corridors between the Benue National Park and the Faro National Park through the hunting areas, by identifying the main threats to their integrity, mapping of land use, characterization of their flora and the wildlife inventory that frequents these corridors in order to propose measures for their sustainable management. Field observations, land use mapping from the 2016 Landsat 8 image classification, and 60 floristic surveys at six sites (corridors) on 20 m × 20 m plots treated under R resulted in the following results: nine types of activities were identified, including logging, agriculture, grazing and forestry. With ggold panning the main threats to corridors, the species mostly used by these farmers are Piliostigma thonningii (82.674 ± 4.24), Combretum sp. (78.18 ± 4.01) and Tamarindus indica (75.06 ± 3.85) among the most threatened woody species. On the floristic level, vegetations under the influence of anthropic activities present a large number of rejections, a small number of adult stems. The Shannon diversity index varies between 4.30 and 5.07 in all corridors. On the other hand, the index of equitability varies from 0.50 to 0.59. On the faunal plan, 204 individuals, belonging to 12 animal species, grouped into 6 families frequent the corridors. This number is well below what was achieved in 2010 when there was a decrease of 1024 individuals in the corridors, a decrease rate of 83.38%. In the face of these threats, which risk irreversibly damaging the corridors, a restoration and conservation plan for these corridors that will integrate community management based on strengthening the participatory approach is essential.   Key words: Corridor, planning, national park, biodiversity, inventory, socio-economic surveys, anthropogenic activities, north.

Diversity and Volume Assessment of Tree Species in the Tropical Forest at Obanla, Akure, Nigeria

This study focused on the assessment of tree species diversity and abundance at The Federal University of Technology, Akure Tropical Forest Obanla. The research was carried out from May, 2019 to September, 2019. Complete enumeration sampling was adopted for the data collection and all trees with diameter at breast height (Dbh) above 0.1 m were identified and measured. Other tree growth variables, such as diameter at the base (db), diameter at the middle (dm), diameter at the top (dt) and the total height were all measured for volume estimation. Ricinodendron heudelotii Hd the highest number of stems (13), so it was the dominant tree species.The result shows that mean tree volume ranges from a minimum of 0.26 m3 for Olalaceae family, to a maximum of 77.70 m3 for Euphorbiaceae family. Ceiba pentandra of Malvaceae family had the highest mean volume (14.62 m2) while the lowest was recorded for both Khaya senegalensis and Newbouldia laevis with a volume of 0.13 m2. The family of Euphorbiaceae was regarded as the dominant family in the natural forest with 26 tree species which is the highest in this study and with the highest volume (77.70 m2). Shannon Wiener diversity index and species equitability index according to Pielou’s of 3.24 and 0.92 were respectively obtained for the study area. This study revealed the efficacy of an undisturbed natural forest in in situ conservation. Active regeneration can be carried out for proper stocking of the forest so has to make it a potential biodiversity hotspot.

Vegetation and ecoregion analysis at Sipirok Botanic Gardens, South Tapanuli, North Sumatra, Indonesia

Abstract. Siregar M, Purnomo DW, Siregar HM, Witono JR. 2020. Vegetation and ecoregion analysis at Sipirok Botanic Gardens, South Tapanuli, North Sumatra, Indonesia. Biodiversitas 21: 2526-2535. Botanic Gardens is an ex-situ plant conservation area. Enrichment of plant collections of Botanic Gardens in Indonesia is based on ecoregion types. To find out the type of ecoregion, the existing vegetation, main native species should be known. The research aimed to analyze the existing vegetation and ecoregion type at Sipirok Botanic Gardens. Existing vegetation has been carried out using a separate plot method 20x20 m which is placed on purposively in nine locations considered to have different vegetation types, namely remnant forest, young secondary forests and shrubs, rubber plantation, and grasslands. Around 66 species belonged to 45 genera and 27 families were found in vascular plants (dbh ≥ 10 cm). There were 66 species of sapling belonged to 54 genera and 35 families, and 110 seedlings belonged to 87 genera and 50 families. The tree species that have the highest Importance Value Index are Ficus sumatrana (PU-1), Myristica fatua (PU-3), Hevea brasiliensis (PU-4 and PU-7), Artocarpus elasticus (PU-8), and Knema cinerea (PU-9). No trees were found in young secondary forest/shrub plots and grasslands. Unlike the species dominance index, the species diversity index and species equitability index are higher in natural forest plots. Beta diversity based on Jaccard similarity index and Whittaker's index shows a relatively different species composition among plots. Cluster analysis shows the tendency of grouping in 2 types of communities, namely: a) remnant forest communities, and b) secondary communities. The natural forest community is further divided into two communities consisting of remnant forest tree species and industrial/plantation plant species also secondary tree species. Secondary communities are also further divided into secondary forest communities and grasslands. Based on ecoregion analysis using previous publications, altitude, and diversity of plant species in the study site, Sipirok Botanic Gardens is a transitional zone of the Sumatran lowland rainforest and mountain rainforest.

Comparative phytosociological assessment of three terrestrial ecosystems of Wayanad Wildlife Sanctuary, Kerala, India

Phytosociological studies were conducted in three vegetation types in the WS II area of Wayanad Wildlife Sanctuary. In each vegetation type, 85 quadrats (10 x 10 m) were laid to quantify the vegetation. Natural forest showed comparatively higher species richness than plantation and vayal (swamps/low lying grassland). In natural forest 96 plant species were present while it was 70 and 66 respectively in plantation and vayal. Fabaceae was the dominant family in all the three vegetation types. The natural forest was dominated by Chromolaena odorata, followed by Lantana camara, Mimosa pudica, Terminalia elliptica, Glycosmis pentaphylla. In the plantations, Chromolaena odorata, Tectona grandis, Mimosa pudica and Glycosmis pentaphylla showed dominance. The vayal was dominated by Arundinella leptochloa. The second most dominant species in the vayal was Chromolaena odorata. Other dominant species were Kyllinga nemoralis and Sporobolus tenuissimus. Among the three, vayal recorded the highest Simpson Diversity Index. The highest Berger-Parker Dominance Index value in plantation indicates the presence of dominant species. Natural forests recorded highest Margalef Richness Index and the least was in vayal. The highest Pielou’s Wiener Equitability Index in vayal indicated all species are evenly distributed.

Diversidade morfológica de colêmbolos em sistemas agroflorestais no Sudoeste do Paraná

Sistemas agroflorestais promovem modelos de produção sustentável, favorecendo desta forma o desenvolvimento da fauna edáfica. Neste sentido, o estudo teve por objetivo avaliar a diversidade morfológica de colêmbolos, em três sistemas agroflorestais, sendo um deles já consolidado com 8 anos de implantação (SAF1) e outros dois em processo de estabelecimento do sistema agroflorestal com 3 anos (SAF2 e SAF3). A fauna do solo foi amostrada a partir da instalação de 10 armadilhas tipo Pitfall-traps em cada uma das áreas, as quais permaneceram 7 dias a campo. Após sua remoção, foram transferidas para o laboratório e seu conteúdo lavado em peneira de malha fina, sendo os indivíduos da classe Collembola classificados em morfotipos. Os dados obtidos foram analisados quanto à abundância, riqueza de grupos e pelos índices de diversidade de Shannon e equitabilidade de Pielou. Como resultado obteve-se 29 morfotipos, sendo o grupo de organismos epiedáficos o mais expressivo e o morfotipo Epi4 o mais representativo dentre as áreas. O SAF1 apresentou maior abundância e riqueza de morfotipos, bem como maiores valores de diversidade e uniformidade, sugerindo que em longo prazo os sistemas agroflorestais favorecem o desenvolvimento deste grupo.

Structural and compositional shifts in Cerrado fragments in up to 11 years monitoring

The Cerrado has a wide diversity of fauna and flora, and the knowledge of its horizontal structure, in different time intervals allows the prediction of its structural and floristic characteristics. The aim of this study was to evaluate the changes in structure and composition of tree community in three fragments of Cerrado with low anthropization, in an interval of 11 years at Minas Gerais state. Rectangular plots of fixed size were sampled, measuring stem diameter and height of all living arboreal individuals with diameter at 1.30 meters above ground (DBH) ≥ 5 cm. The tree vegetation dynamics study of the areas was performed, as well as the floristic analysis and the diametric structure. Considering all fragments and years of measurement, the recruitment of trees surpassed its mortality. The basal area varied between 3.67 and 13.07 m².ha-1. The studied areas, considering all fragments and years of measurement, showed a Shannon diversity index (H') from 3.43 to 3.87 nat.ind-1 and Pielou equitability index (J') ranged an interval between 0.77 and 0.82. The similarity calculated by the Jaccard index (J), when performed per plot considering the three fragments, showed a value of 0.2653. Also, related to the development and growth of the study areas, it can be inferred that all fragments and their respective years of measurement had a J-inverse pattern. In conclusion, it can be inferred that the three fragments maintained a representative growth in number of individuals and basal area.

Anthropozoic impacts on forest ecosystems: Case of the Zloul Valley (Ribat Al Khair Region, Morocco)

AbstractOver the second half of the past century, the Zloul Valley has undergone rapid and intense changes, such as deforestation and massive clearing as well as a grazing ban in olive plots since the introduction of olive cultivation approximately 30 years ago. The aim of this study was to explore these rapidly changing ecosystems. The floristic analysis revealed a more pronounced anthropozoic impact on the Chamaerops humilis and Ampelodesmos mauritanicus steppe group, which displayed the lowest floristic diversity, with a Shannon–Weaver index of 3.72, and a very high disturbance, of 68.85%. The grazing ban in olive plots had a positive effect on floristic richness and diversity, with the Shannon–Weaver index reaching a maximum value of 4.67. However, the floristic composition remained unbalanced, with an equitability index of 0.61 and a perturbation index of 70.8%. Therefore, these ecosystems have not been able to recover their initial equilibrium despite being under protection for long. The ecosystems of the Zloul Valley demonstrated alarming levels of degradation, especially on the southern slopes of Jbel Ikraa and Jnab Diss. Urgent measures must be taken to mitigate biodiversity loss and soil erosion as a matter of priority.

Potential impact of active substances in non-thermal discharge plasma process on microbial community structures and enzymatic activities in uncontaminated soil

Soil microbial community structures and enzymatic activity are important indicators for judging biochemical process intensity and soil quality. Non-thermal discharge plasma (NDP), an advanced oxidation technique, has received great attention in soil remediation. Potential impact of NDP treatment on microbial community structures and enzymatic activities in uncontaminated soil samples was evaluated in this study. The NDP treatment significantly altered soil microbial community structures and enzymatic activity. The exposure of soil samples to NDP decreased the enzymatic activities including glutamic acid enzyme, arylsulphatase, leucine enzyme, acetyl glucosaccharase, glucosaccharase, cellulose, phosphatase, and ligninase. The contents of some soil microbes including Gram-negative bacteria, Fungi, Anaerobes, AM Fungi, Eukaryotes, and Actinomycetes also decreased after NDP treatment, as well as the diversity index and equitability index of the soil microbes. In addition, the total phospholipid fatty acid (PLFA), Fungi PLFA, bacteria PLFA, and Actinomycetes PLFA of the soil microbes were also reduced after treatment. Principal component analysis confirmed these changes. Actinomycetes and Fungi were the most sensitive microbes to the NDP, and Phosphatase activity and Cellulose activity were relatively insensitive to the NDP. The potential impacts could be attributed to chemically active substances and ultraviolet irradiation.

Physico-chemical and Biological Evaluation of the Quality of Surface Water in the Wadi El-Melha Watershed (North-East Algeria)

This environmental study targeted the ecological assessment and classification of the waters’ state of health at the level of the Wadi El-Melha watershed flowing from Lake Mellah (northeast of Algeria) through Physico-chemical parameters measured in situ and measured in the laboratory, and the biological quality achieved through Odonates as bio indicators of ecological potential in watercourses. The aim is to conserve the potential of the ecosystem (biotope, habitat and reproduction of species, flow of water, rambling of the bed). The waters’ quality of the Wadi El-Melha watershed seems to be generally good at the end of this study despite some recognized disturbances in some sections, which are essentially linked to alterations by, nitrites nitrates and phosphates which in places influence the quality of the surveyed river. In terms of biological quality which was assessed using ecological indices, the results revealed a stability of the stand during the study period. The odonatological procession is diverse (Shannon index H'= 2.26), and it is in equilibrium (equitability index E = 0.90). Based on the classification proposed by [1], Wadi El-Melha is among the middle rivers, meaning a moderately polluted classification.

Diversity and abundance of Lepidoptera populations in the Theniet El Had National Park (Algeria).

An inventory of Lepidoptera in the Theniet El Had National Park (PNTEH), Algeria, revealed 86 taxa, both butterflies and moths. The specimens were collected in 68 localities distributed over ten cantons within the park in the period 2015-2017. A preliminary faunistic list is compiled as a base-line contribution to the study of adult Lepidoptera in this park. In total, 3139 specimens were collected. The moths are clearly well diversified, with 14 families and 49 species obtained from a total of 1485 adult specimens. The butterflies are represented by 5 families with 37 species and 1654 specimens. A total of 8 families are reported for the first time from this park, in order of abundance: Zygaenidae, Hesperiidae, Crambidae, Alucitidae, Heterogynidae, Sesiidae, Oecophoridae, and Cossidae. Also 61 species are recorded here for the first time for the park. The most diverse family is Nymphalidae with 15 taxa (23% of the total species). On the other hand, the Erebidae are represented by 894 specimens (28.5% of the total number of specimens. Within the Erebidae, the genus Catocala contains the highest number of individuals (794 specimens). The canton of Pré-Ben Chouhra is quantitatively the best represented with 625 specimens (19.9% of the total number of specimens collected) and the Nursery canton as the richest in lepidopteran species with 72 species observed. The diversity indices (H' and Hmax.) and the equitability index (E), calculated for the 10 cantons indicate that lepidopteran species are diverse in each station.

Structure communities of macrozoobenthos in mangrove tourism area, Wongsorejo sub-district, Banyuwangi regency, East Java

Macrozoobenthos is an organism that lives on the surface or in liquid sediment. Macrozoobenthos is one of the most important organisms for marine and coastal ecosystems. This study aimed to determine the value of the community structure of macrozoobenthos existing in Mangrove Center Bengkak, a subdistrict of Wongsorejo, Banyuwangi regency. Sampling was conducted on three stations with different location characteristics. The community structure was measured by Shannon’s diversity index, Equitability index, and dominance index. The results of this study obtained Shannon’s diversity index of 0.51, equitability index of 0.12, and dominance index of 0.76 at Station 1. At station 2, Shannon’s diversity index of 1.19, equitability index of 0.39, and dominance index of 0.36. While at station 3, it was obtained that Shannon’s diversity index of 1.64, equitability index of 0.85, and dominance index of 0.31.

Plankton Community Structure in PLTA Koto Panjang Reservoir, Kampar District, Riau Province

Koto Panjang Hydroelectric Power Plant is one of the reservoirs in Riau Province, many activities in Koto Panjang. Plankton is one of the organisms that is influenced by this condition. This study aims to determine the plankton community structure in Koto Panjang. The study was conducted on May 2019. Survey methods were used in this research. Samples were taken 3 times, once / weeks, in 3 different areas. One hundred liters of water was sieved into 125 ml using a plankton net number 25. The plankton was sampled was fixed using a Lugol solution and identified using a binocular microscope. There were 11 classes of plankton in Koto Panjang, 8 classes of phytoplankton and 3 classes for zooplankton. The value of plankton species diversity index (H’) is ranges from 4.86 to 5.35, dominant index (C) 0.03-0.05 and equitability index E 0.54-0.62. The plankton community structure in the Koto Panjang Reservoir is categorized as good.

Diversity of biting midges Culicoides (Diptera: Ceratopogonidae), potential vectors of disease, in different environments in an Amazonian rural settlement, Brazil.

INTRODUCTION: The Culicoides transmit a variety of pathogens. Our aim was to survey the Culicoides species occurring in an Amazonian rural settlement, comparing abundance, richness, and diversity in different environments. METHODS: Culicoides were captured using CDC light traps. The Shannon-Wiener (H’) and Rényi indices were used to compare species diversity and evenness between environments, the equitability (J’) index was used to calculate the uniformity of distribution among species, and similarity was estimated using the Jaccard similarity index. A permutational multivariate analysis of variance was applied to assess the influence of environment on species composition. A non-metric dimensional scale was used to represent the diversity profiles of each environment in a multidimensional space. RESULTS: 6.078 Culicoides were captured, representing 84 species (45 valid species/39 morphotypes). H’ values showed the following gradient: forest > capoeira > peridomicile > forest edge. The equitability J’ was greater in capoeira and forests compared to peridomiciles and the forest edge. The population compositions of each environment differed statistically, but rarefaction estimates indicate that environments of the same type possessed similar levels of richness. Species of medical and veterinary importance were found primarily in peridomiciles: C. paraensis, vector of Oropouche virus; C. insignis and C. pusillus, vectors of Bluetongue virus; C. filariferus, C. flavivenula, C. foxi, and C. ignacioi, found carrying Leishmania DNA.CONCLUSIONS: This study indicates that diversity was higher in natural environments than in anthropized environments, while abundance and richness were highest in the most anthropized environment. These findings suggest that strictly wild Culicoides can adapt to anthropized environments.

Anthropogenic Impacts on Fish Populations in Lake Cayo (Republic of Congo, Central Africa)

Ichthyofaunal diversity and the impact of anthropogenic activities on fish population assemblages were studied in Lake Cayo, a small lake located in the coastal region of the Republic of Congo. Twelve stations were sampled twice over a two-year period. Fishing techniques following standardized methods utilizing monofilament gill nets, and nine environment variables were measured at each station. A total of 11,361 specimens comprising 30 species in 28 genera and 18 families were collected with the Cichlidae being the most diversified. Redundancy Analysis with forward selection coupled with Monte Carlo permutation tests identified depth, pH and substrate as accounting for 57.7% of the total variance among the nine variables sampled (p < 0.05). The low Shannon’s diversity (1.16 ± 0.33) and Equitability (0.43 ± 0.12) indices at all sites, suggest that the Lake Cayo system is in poor ecological health.

Plankton Composition in Relation to Water Quality in the Coastal Waters of Nigeria

Coastal waters of Ondo State, Nigeria have diverse assemblage of fish, yet there is dearth of information on its plankton composition. This study investigates plankton components in relation to physicochemical characteristics of the coastal waters bordering Olotu, Ayetoro and Bijimi in providing baseline information that can be used for planning and implementation of policies for monitoring, impacts assessment and conservation. Surface water samples were collected on monthly basis from March to June 2015 to analyze physicochemical parameters while plankton net of 55μm mesh size was used for collection of plankton using standard methods prescribed by APHA. The light and dark bottle method was used to determine primary productivity. Shannon-wiener, Margalef and Equitability Indices were used for diversity. Values of the physicochemical parameters observed ranged as follows: temperature, 27.47±2.06-29.27±0.31ºC; turbidity, 43.43±0.91-65.33±2.52NTU; pH, 5.54±0.31-6.12±0.30; BOD, 2.20±0.29-5.43±0.54 mg/l; COD, 6.08±2.71-6.66±1.52 mg/l; dissolved oxygen, 6.39±0.39-7.78±0.19 mg/l and salinity, 2.03±0.06-3.77±0.04 mg/l. Fifteen species of phytoplankton and three developmental stages of zooplankton were recorded. Phytoplankton accounted for 83.3% as against 16.7% zooplankton. Diatoms (93.3%) and dinoflagellates (6.7%) represented phytoplankton whereas 66.7% of zooplankton belonged to the phylum Arthropoda. Primary productivity ranged between 132.194±13.48m-3hr-1 and 134.48±15.27m-3hr-1. Some dominant species recorded were Coscinodiscus, Biddulphia, Copepod, Skeletonema and Ditylum. pH and Temperature were major determinant of the composition, diversity and abundance of plankton. The observed plankton group indicates the suitability of the creeks as habitat and breeding ground for diverse aquatic species. The water quality falls within acceptable range hence the environment can be classified as healthy ecosystem.

Optimizing crop mix with respect to economic and environmental constraints: An integrated MCDM approach

This study develops an integrated framework for assessment of cropping sustainability at the aggregate (country) level. Such sustainability criteria as total water footprint, Shannon equitability index, total output, and downside coefficient of yield variation are used to rank the crop mixes, corresponding to different assumptions. Mathematical programming model is applied to generate the crop mixes. Then, the three MCDM techniques (SAW, TOPSIS and EDАS) are applied for the ranking. Empirical analysis embarks on the case of Lithuania, which is a new EU member state. Sensitivity analysis is carried out by establishing the three weighting schemes (balanced, environment- and economy-oriented). The results suggest that scenario minimizing labour use render the most sustainable crop-mix. Correlation among the ranks of the scenarios suggests that environmental and economic approaches are conflicting between themselves, yet there is no such a serious contradiction among the latter two approaches and the balanced approach.

Environmental Influences on Fish Species Distribution in the Musolo River System, Congo River Basin (Democratic Republic of the Congo, Central Africa)

Ichthyofaunal distribution was studied in the Musolo River system, a small affluent tributary of the Congo River flowing into Pool Malebo (Democratic Republic of the Congo). Twelve ecological stations were sampled, of which eight were located in the Musolo main-channel and four in the Fushi River, a principal tributary of the Musolo. Each station was sampled four times over a two-year period, with fishing techniques following standardized methods utilizing dip and cast nets, and nine environment variables were measured at each station. Fifty-three fish species belonging to 36 genera and 16 families were collected with the Alestidae, Distichodontidae, Cichlidae, Cyprinidae, Mormyridae, and Mochokidae being the most diversified. Redundancy Analysis with forward selection coupled with Monte Carlo permutation tests (499 permutations) identified total dissolved solid (25.8%) and altitude (24.4%) as accounting for 50.2% of total variance (p < 0.05). The contribution of the two first axes was significant (F = 3.41; p = 0.004). Species richness increases from upstream to downstream. In general, the high value of Shannon’s diversity (1.07-2.67) and Equitability (0.62-0.96) indices at all sites, indicates that the examined stretch of the Musolo River system is in good ecological health, despite its location adjacent to the megacity of Kinshasa.

Contribution to the Study of Diversity, Distribution, and Abundance of Insect Fauna in Salt Wetlands of Setif Region, Algeria

The present study aims to assess entomofauna biodiversity at three saline wetlands, located in Setif region, Northeastern Algeria. To determine the predominant environmental factors in the distribution of entomofauna, six different stations and three transects in each station were chosen according to the distribution of plant and soil salinity in each transect. Results were analysed, and different ecological indexes and analytical methods were applied, from 2016 to 2017. The total of individual insects belonging to 9 orders, 71 families, and 131 species were collected from the three sites. The highest abundance was in Coleoptera (38.17%) while the lowest abundance was found in Ephemeroptera (1.53%). The highest number of individuals (11438) was found in Bazer site in 2016, while the lowest number of individuals (4921) was in site Chott Frain in 2017. The highest abundance of insects (109) was recorded in transect BS1T16, and the lowest abundance of species was recorded in transect HS1T36. Diversity and equitability indices showed highest values in HS1T16 (H = 4,356) and HS1T37 (E = 0.7282). Some ecological parameters showed a significant relationship between the insects occurrence, distribution of plants, and type of soil.

The Perifiton Alga Community in Masang Kecil River Receives Liquid Palm Oil Mill Waste in Kinali District, West Pasaman Regency

The study of the periphyton algae community in Masang Kecil River that received palm oil mill effluent in Kinali District, West Pasaman Regency was held from November 2017 to September 2018. This study aims to determine the composition and structure of periphyton communities in the Masang Kecil River in Kinali, West Pasaman. This study used purposive sampling method with a sampling location of 4 stations. Based on this study, 88 species of periphyton were classified as 3 classes i.e Bacillariophyceae (64 species), Chlorophyceae (15 species) and Cyanophyceae (9 species). The average density is 8.967 ind/ cm2. The highest relative density (KR) at stations 1,2 and 3 is Navicula lanceolata and station 4 is Fragilaria capucina. Species that are always found at each station (FK= 100%) are Fragilaria capucina, Navicula lanceolata and Synedra ulna. The diversity index in the Masang Kecil River is classified as medium (H’ = 2.87). Equitability index is evenly distributed (E= 0.64). Dominance index (C= 0.12) there is no dominant species. The similarity index is almost the same except between stations 1 and 3.

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.&#x0D; Study Design: The research was conducted by survey.&#x0D; 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.&#x0D; 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.&#x0D; 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 &lt;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.&#x0D; 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.