Shannon-Wiener Diversity Index Values Research Articles

Mangrove gastropod distribution based on dominant vegetation classes and their relationship with physicochemical characteristics on fringe mangroves of Lembongan Island, Bali, Indonesia

Abstract. Ernawati NM, Dewi APWK, Sugiana IP, Dharmawan IWE, Ma’ruf MS, Galgani GA. 2024. Mangrove gastropod distribution based on dominant vegetation classes and their relationship with physicochemical characteristics on fringe mangroves of Lembongan Island, Bali, Indonesia. Biodiversitas 25: 156-166. Mangrove ecosystems are important in supporting diverse marine life, offering refuge, reproductive grounds, and sustenance to various species. However, mangroves possess distinct zoning patterns determined by dominant species due to environmental variations that significantly impact the biodiversity of biota, particularly gastropods. A study on the Indonesian island of Nusa Lembongan revealed distinct communities of coexisting gastropod species in each mangrove vegetation zone. We discovered 29 distinct species of mangrove gastropods, with the Sonneratia mangrove zone having the most and the Lumnitzera zone having the least. Certain species, including Amphidromus perversus, Cerithium adustum, and Echinolittorina sundaica, were detected in only one of the mangrove zones. In each mangrove zone, the composition of gastropod species changed depending on the substrate type, e.g., soil, mangrove trunks, or mangrove leaves. The Shannon-Wiener diversity index values range from low to high diversity, and the community structure index values in mangrove zones vary. The evenness index varied by region, with Avicennia, Bruguiera, and Sonneratia having the highest index value. The findings indicate that mangrove vegetation zones are essential for maintaining diverse gastropod populations, with distinct composition and abundance patterns influenced by the distance of each mangrove zone from the ocean. This data may influence conservation efforts to preserve mangrove habitats and the diverse array of organisms that depend on them.

Ecological habitat quality assessment of a highly urbanized estuary using macroinvertebrate community diversity and structure

Urban estuaries are subject to a variety of ecological crises caused by humans as a result of rising shore-based human activities. In this study, environmental variables, community composition, structure and diversity indices of benthic macroinvertebrate were studied to assess the ecological health status of an urbanized estuary, Karnaphuli river estuary. The results revealed that dissolved oxygen (DO) was very low, and organic matter was much higher in the estuary. There were significant (p < 0.05) differences among the environmental variables across the sites. 31 taxa were identified yielding a total of 49167 Ind./m2 with overall mean density (±SD) of 159 (±327) Ind./m2. Annelida (61.8%) were the most abundant taxonomic group followed by Polychaeta (34.88%) and Oligochaeta (26.92%). The high abundance of pollution indicator taxa (Tubificidae, Capitellidae) and low abundance of pollution sensitive taxa (Lumbrinidae, Sabellidae, Maldanidae, Nephtyide) indicated detrimental ecological condition. The values of Shannon-Wiener diversity index (1.95–2.63), Pielou’s evenness index (0.60–0.81) and the Margalef diversity index (1.03–2.12) suggested moderate pollution status with extremely low species richness and low abundance in polluted areas. A PERMANOVA showed significant differences in faunal assemblages (F = 2.189, p < 0.001) among sites. Species abundance and density were higher (p = 0.32) at the upper estuary (where pH and salinity were low) and reduced in the middle and lower portion of the estuary which reflected the gradient of pollution level. Cluster analysis (CA) demarcated three distinct communities in terms of species similarity. SIMPER identified the highest average dissimilarity value (66.66%) across all the stations. The Canonical Correspondence Analysis (CCA) results suggested benthic macroinvertebrate community was influenced by environmental variables, for instance, salinity, dissolve oxygen, soil and water pH, total dissolved solids, and sediment texture.

The Diversity of Reptile Species in Mangrove Ecotourism of Kampung Rawa Mekar Jaya, Siak Regency

Rawa Mekar Jaya mangrove ecotourism is the last mangrove forest on the east coast of Sumatra Island. This mangrove forest is a home for reptiles. The reptilian fauna of the Mekar Jaya mangrove has the potential to become an ecotourism object. This study aims to determine the diversity, evenness, abundance, and status of reptile species in the Mekar Jaya mangrove ecotourism. Four 3 x 400 m transects were conducted in two habitat types: aquatic (10 m of bank) and terrestrial (30 m of bank). Observations were made in the morning and evening at low tide and repeated five times at three-day intervals. Direct collection of reptile data using a visual survey (VES) and passive sampling (glue trap). The researchers managed to capture 52 individuals, which were reptiles, consisting of 4 species (Draco sumatranus, Hemidactylus platyurus, Mabuya multifasciata, and Varanus savator) found directly in the field. The results of the interviews with the managers indicate that there are 2 species of crocodiles: Crocodylus porosus and Tomistoma schlegelii. Shannon-Wiener diversity index value was medium (H'=1.02). Evenness index was labile (0.57). The highest species abundance was M. multifasciata (0.65), while the lowest abundance was H. platyurus (0.12). All reptile species found were not protected. V. salvator is classified as a low-risk species (LC/Minor Concern) and is listed in Appendix II of CITES. Two crocodile species reported by the community are protected. T. schlegelii is vulnerable and listed in Appendix I of CITES. C. porosus is low-risk and listed in CITES Appendix II.

Dampak Konversi Hutan Menjadi Perkebunan Kelapa Sawit Terhadap Keanekaragaman dan Kelimpahan Kupu-kupu Superfamili Papilionoidea

The research was conducted in June to August 2022 in Ubiyau Village, Yanamaa Village and Yuwanain Village, Arso District, Keerom, Papua. The aim of the study was to determine the impact of forest conversion to oil palm plantations on the diversity and abundance of the Superfamily Papilionoidea butterfly. The line transect count method was used for sampling butterflies with a transect length of 1500 m at each study area. Sampling was carried out along a line transect in an imaginary box measuring 10 x 10 x 10 m which was carried out on sunny days from 09.00 am to 14.00 pm. The highest species diversity of the Superfamily Papilionoidea was found in Secondary Forest (HS), namely 70 species consisting of Papilionidae (8 species), Pieridae (5 species), Lycaenidae (21 species) and Nymphalidae (36 species). There were 42 species of butterflies recorded from Non-Productive Oil palm Plantations consisting of Papilionidae (5 species), Pieridae (4 species), Lycaenidae (11 species) and Nymphalidae (22 species). While the lowest number of butterfly species was encountered in Productive Oil Palm Plantations namely 32 species consisting of Papilionidae (5 species), Pieridae (3 species), Lycaenidae (8 species) and Nymphalidae (16 species). These data indicated that conversion of secondary forest to oil palm plantations reduced butterfly species by around 40-53%. The highest Shannon-Wiener Diversity Index (H') and Margalef Diversity Index (Dmg) values were found in secondary forest (H'=3.4; Dmg =13.7) followed by Non-Productive Oil Palm Plantations (H'=2.5; Dmg=7.2) and Productive Oil Palm Plantations (H=2.0; Dmg=6.1). The highest species similarity was between Secondary Forest and Productive Oil Palm Plantations with Sorensen Index value IS=60%, followed by Non-Productive Oil Palm Plantations and Productive Oil Palm Plantations (IS=51%) and the lowest species similarity index was between Secondary Forests and Non-Productive Oil Palm Plantations (IS = 46%). In Secondary Forest the composition of the number of individuals per species tends to be more evenly distributed compared to oil palm plantations. Forest conversion to Oil Palm Plantations has a negative impact on butterfly species diversity of the Superfamily Papilionoidea. The lost species that were not found in oil palm plantations were forest specialist species with small range sizes and niches as well as specific diets that were only found in forest. Key words: Papilionidae; primary forest; Pieridae; Nymphalidae; Lycaenidae; Keerom.

Keanekaragaman Tumbuhan di Kawasan Lindung Areal IUPHHK-HT PT. Wana Hijau Pesaguan Provinsi Kalimantan Barat

Protected area in plantation forest should be managed properly in order to sustainable development. One of the initial steps of the protected area management is by knowing the level of plant diversity which composing the community of its vegetation. The aim of this research is to measure plant diversity in protected area of IUPHHK-HT PT. Wana Hijau Pesaguan in Province West Kalimantan. Vegetation analysis is done at riverbanks, slope area more than 40% and conservation area of biodiversity. The result is that there are found 295 species of plants consisting 222 trees, 32 under storey plants, 38 lianas and 3 epiphytes. Shannon-Wiener diversity index (H’) values of trees with anystage of growth are about 3.02–4.41, which classified as high level of diversity. Under storey plants and lianas have H’ values about 1.00-3.22 which classified as mid level diversity. The diversity level of epiphytes are low to mid, with H’ values 0-1.04. Similarity Index value between all locations are low (less than 75%) except for epiphytes, which only in conservation area of biodiversity had different epiphytes composition comparing to the other sites.&#x0D; Key words: plant diversity, plantation forest, protected area, West Kalimantan

Keragaman Serangga pada Tanaman Terong Ungu (Solanum melongena)

Indonesia as a mega-biodiversity country has a very diverse diversity of insects. The diversity of these insects has both beneficial and detrimental roles. The beneficial role of insects is that they act as pollinators, predators of pests and regulators of wild plant populations, while the detrimental roles of insects are plant-eating pests and disease vectors in plants. Insects have many habitats, one of which is purple eggplant or solanum melongena. Eggplant is cultivated for consumption and contains many ingredients. This plant is widely cultivated because it contains nutrients consisting of minerals and vitamins such as A, B and C, is low in calories and fat, and contains some protein, fiber and carbohydrates. This research is included in the quantitative descriptive research. This research is located on the agricultural land of PT. BIO, which is located at Jl. Banjar Sari No. 38, Dusun Awisurat, Tanjungsari, Kec. Tanjungsari, Sumedang Regency, West Java and takes place for 2 weeks in November 2022. Insect data collection uses insect nets and data that can be analyzed using relative abundance and Shannon-Wiener diversity index values. The insects found consisted of 6 orders namely Diptera, Hemiptera, Coleoptera, Orthoptera, Mantodea and Hymenoptera. The six orders consist of 9 families. The eggplant planting area has a Shannon-Wiener diversity index value of 1.8 so that the planting area conditions are close to natural conditions with an index value of &gt; 2. From the findings, insects can be classified into four groups based on their role in eggplant plants. Based on their roles, six pest species, three predator species, one pollinator species and one non-pest species. The abundance of insect species in eggplant planting fields has low criteria except for Henosepilachna vigintioctopunctata which is moderate. The level of insect diversity in purple eggplant plantings was moderate, with the species that had the highest abundance being Henosepilachna vigintioctopunctata

Community distribution and utilization of gastropods in the Coastal Area of Liki Island, Sarmi District, Papua, Indonesia

Abstract. Sujarta P, Mailissa MG, Keiluhu HJ, Hadisusanto S, Yuliana S. 2022. Community distribution and utilization of gastropods in the Coastal Area of Liki Island, Sarmi District, Papua, Indonesia. Biodiversitas 23: 5001-5011. Gastropods and snails are mollusk phylum animals with diverse species that inhabit and spread in various marine ecosystems. The main objective of this study was to determine the structure of gastropod communities and their utilization in the coastal area of Liki Island, Sarmi District, Papua, Indonesia. Samples of gastropods were collected through descriptive-quantitative surveys using the line-transects technique. In addition, information on the utilization of gastropods was collected from surveys with semi-structural interviews with selected respondents from Liki Island, the outermost island in East Indonesia, with a total area of 1318.54 ha. The result showed a total of 1812 living specimens from 63 species of gastropods from 23 families, collected from six sampling stations, with 182-603 specimens on average. There were five species of gastropods encountered in all sampling stations, namely Conus litteratus (family of Conidae), Monetaria moneta, Monetaria annulus (Cypraeidae), Oxymeris crenulata (Terebridae), and Polinices flemingianus (Naticidae). The highest Importance Value Index (IVI) belonged to Nerita albicilla (Neritidae) from Station 1 (IVI 58.45). In contrast, the lowest belonged to the species of Nassarius limnaeiformis (Nassariidae), Oliva caerulea, and Oliva oliva (Olividae) from Station 4 (each IVI 2.56), with the moderate value of Shannon-Wiener Diversity Index and low value of Dominance Index. People in the coastal area of Liki Island use 12 species of gastropod as wall ornaments and consume 12 species of gastropod, as well. In general, the people of Liki Island use gastropods wisely based on the socio-cultural characteristics of the local community.

DRAGONFLIES DIVERSITY AND LAND COVER CHANGES IN THE BATUBOLONG RIVER, WEST LOMBOK DISTRICT

West Lombok District is the second largest district in Lombok Islands. The diversity of dragonflies (Order Odonata) as a bioindicator of environmental quality has not been widely studied in the West Lombok region. This study aimed to determine the species diversity of dragonflies (Order Odonata) found in Batubolong River, West Lombok District and its relation to the occurring land cover changes. This study was carried out by using a descriptive explorative method, where the sampling technique was done by means of line transects. Maps of study and sampling locations as well as land cover changes were made using ArcGIS 10.4.1 software based on primary and secondary data. The results showed that there were 11 species of dragonflies with a Shannon-Wiener diversity index value (H') of 2.212 (medium diversity), a population density index (C) of 0.126 (low dominance), and a species evenness index (E) of 0.923 (high uniformity). Our study also found two rare species of dragonfly in Lombok Island i.e., 3 individuals of Nososticta emphyla (Lieftinck, 1936) with 9% relative abundance and 1 individual of Drepanosticta berlandi (Lieftinck, 1939) with 3% relative abundance. The discovery of D. berlandi in Lombok is the third time after the findings in 1896 and the 19th century. Analysis of satellite data around the sampling area within the period 2013-2020 showed that there has been an increase in land cover of 6,149.29 m2. The increase in land cover changes may have caused the disappearance of several Odonata species in the sampling location.

Evaluation of several plant species for the sustainability of green open spaces in three sectors

Abstract. Salsabila SH, Kurniadie D, Withaningsih S. 2022. Evaluation of several plant species for the sustainability of green open spaces in three sectors. Biodiversitas 23: 3861-3868. The climate change caused by air pollution could be overcome by creating green open spaces. Plants can absorb air pollution, provide shade, and be used as aesthetics and location boundary. Furthermore, plants' resistance to air pollution varies according to physiology and morphology. The objectives of this study were to assess the species diversity of vegetation and the tolerance index to air pollution of some plant species using the APTI (Air Pollution Tolerance Index) method in household, industry, and transportation areas in Eat Java. The observed plant species in the three sectors were the same. The result showed that the Shannon-Wiener diversity index value (H') was considered medium, and based on the APTI test, Pseuderanthemum reticulatum had the highest tolerance level with an APTI value of 27.59in the industrial sector (I0), 38.31 in the household sector (P1) and 31.73 in the transportation sector (T0). Meanwhile, Syzygium myrtifolium had the lowest tolerance level to air pollution with an APTI value of 12.64 in the industrial sector (I1), 11.59 in the household sector (P1) and 12.70 in the transportation sector (T0). This research provides information regarding the environmental conditions of the ecosystem in green open spaces in the industrial, household and transportation sectors and gives recommendations on the sustainable management of green open spaces in line with Sustainable Development Goals (SDGs) number 13 based on the tolerance level of plants.

Spatial distribution of surface chlorophyll a and micro-phytoplankton density and diversity around two islands and at two banks of the Mascarene region

The present study validated the use of AquaMODIS sea surface chlorophyll a (Chla) concentrations and investigated the spatial variation in density and diversity of micro-phytoplankton around two islands and two fishing banks of the Mascarene region. The study included areas around Mauritius (MRU) and Rodrigues (ROD) Islands, at Nazareth (NZ) Bank, and in the Joint Management Area (JMA) between the Republic of Mauritius and the Republic of Seychelles, more specifically at the Saya de Malha (SM) Bank. The AquaMODIS data were based on 67 match-up data points of in-situ against satellite Chla concentrations. The micro-phytoplankton community structure was investigated by determining the density variation and using the Shannon Wiener (H’) and Evenness (Evar) diversity indices. The satellite and in-situ Chla data were significantly and positively correlated when pooled for the four sites studied (R2 = 0.441; r = 0.642, P &lt; 0.01), and when analysed separately for islands (R2 = 0.480; r = 0.694), and banks (R2 = 0.233; r = 0.483). However, the Chla satellite values tended to be lower than the in-situ Chla data. The highest densities of micro-phytoplankton were observed in the eastern and northern regions for MRU and ROD, respectively. The most dominant genera of micro-phytoplankton were Coscinodiscus, Navicula, Chaetoceros and Ceratium. The Shannon-Wiener diversity index values for diatoms were all above 2.5 with waters around the islands having higher diversity compared to the banks. Overall, the different micro-phytoplankton around the islands, except for the group of cyanobacteria at ROD Island, were more evenly distributed (Evar &gt; 0.6) compared to the banks. This study indicated that AquaMODIS Chla satellite data is valid and may be potentially used as a proxy for in-situ Chla concentration on the Mascarene Plateau. The results of this study also provide detailed insight into the spatial variation in micro-phytoplankton density and diversity on the Mascarene Plateau in the Western Indian Ocean. Further long-term studies are warranted to thoroughly understand the temporal (including seasonal and inter-annual) variations in Chla and micro-phytoplankton distribution for adequate and appropriate management of these ocean territories.

Population structure and diversity of the periphyton community in the glacier-fed stream Balkhila at Siron from Garhwal Himalaya

The stream Balkhila is a glacier-fed and originates at higher altitudes from the Lal Mati glacier, flows through the famous Mandal valley of Garhwal Himalaya and finally merges with the Alaknanda River in Chamoli district of Uttarakhand. The present study aimed to assess the population structure, density and diversity of the periphyton community along with some detrimental ecological parameters in the glacier fed stream Balkhila for a period of two years on a monthly basis from November 2018 to October 2020. The stream Balkhila was represented by 17 periphytic genera belonging to 3 classes, namely, Bacillariophyceae, Chlorohyceae and Cyanophyceae. The class Bacillariophyceae was represented by 10 periphytic genera (Cymbella, Navicula, Fragilaria, Nitzschia, Ampohora, Diatoma, Synedra, Tabellaria, Cocconeis and Meridion), and Chlorophyceae (green algae) was represented by 6 algal genera (Chlorella, Ulothrix, Zygnema, Oedogomium, Spirogyra and Stigeoclonium). The class Myxophyceae was represented by a single genus (Phormidium). The maximum periphytic density (individuals/cm2) was found to be 316.7±7.1 x 103 in January, and the minimum density (12.5±3.5 x 103) was recorded in August. The SIMPLER test indicated 18.58% dissimilarity of periphytic communities between the two years of study. The Shannon–Wiener diversity index values were high (2.358 and 2.388) in December and January and minimum (0.2484 and 0.3534) in July and August during the first and second years of the study, respectively. Multivariate canonical correspondence analysis (CCA) suggested that most of the periphytic genera were closely associated with the winter season (December, January and February). The various ecological parameters of our study indicated that the Balkhila stream is a conducive habitat for periphyton communities.

Seasonal Distribution of Ephemeroptera (Insecta) Fauna and Relationship Among Physicochemical Parameters in the Ceyhan Basin

TThis study was carried out in 20 different localities in the spring, summer and autumn periods in 2019 in order to determine the Ephemeroptera fauna of the Ceyhan Basin and to reveal its relationship with some physicochemical parameters. As a result, 971 specimens were examined and 17 species belonging to six families were identified. There is no data on the given taxa in the Ceyhan basin so all taxa are new records for the Ceyhan Basin. According to the Shannon-Wiener (H) diversity index, the highest and lowest diversity values were determined, respectively, in the spring at stations 7th (1.456) and 6th (0.173), in the summer at stations 20th (1.311) and 13th (0.341), and in the autumn at stations 15th (1.102) and 8th (0.457). According to Evenness (E) values, the most homogeneous stations are the 3rd (0.963), 7th (0.973) and 1st (0.945) stations in the same seasonal order, and the stations with the least homogeneity are the 16th (0.529), 16th (0.659) and 8th (0.527) stations. According to cluster analyses, the highest similarities were observed between stations 3rd and 5th in addition to stations 9th,14th,17th,18th and 19th with 100% percentage. Based on the physicochemical parameters measured in accordance with the Surface Water Quality Regulation, the water quality classes of the stations were in high quality water (Class I) and less contaminated (Class II) water. Canonical correspondence analysis was applied to reveal the relationships between Ephemeroptera taxa and physicochemical parameters.&nbsp;

Assessment of plant species diversity and abundance using line-transect method at Pantai Sabak, Kelantan

Coastal areas are environmentally sensitive areas filled with various local inhabitants focusing on the tree species ecosystem continuing to develop according to its environment. Pantai Sabak is one of the well-known eroded beaches in Kelantan due to the natural phenomenon, tidal wave erosion. This study aimed to identify the species availability and determine the species abundance, density, frequency, and diversity found in Pantai Sabak, Kelantan. Certain native species and common tree species at the coastline area are still available, such as Nypa fruticans and Ipomoea pes-caprae. Shocking results are achieved whereby the shoreline area has been degraded by the tidal wave and shoving away some species such as Cocos nucifera. Due to the situation, the coastal area has reached the mangrove area resulted in the species along the transect line is mangrove species namely Excoecaria agallocha. Another species achieved were shrubs and it showed Pantai Sabak has been severely damaged. A total of 1,350 individuals of 30 species from 30 genera belong to 22 families were recorded along two kilometres transect line. By using the diversity index which is Shannon-Wiener Diversity Index (H’) value is 2.99, Shannon-Wiener Maximum Index (H’max) is 3.40 while Shannon Evenness (EH) is 0.88. These results showed the area of the study is still diverse in species hence dominated by shrubs such Lantana camara. Hence, this study only focuses on the species diversity ecosystem, not the causes of the occurrence that occurred.&#x0D;

Comparison of benthic diatom community structures on natural and artificial substrates in marine lake (Adriatic Sea)

In this study, the diatoms of three alternative habitats (epilithon, epiphyton and artificial sub-strate) were compared to understand the differences in composition on artificial and natural sub-strates. For this purpose, the samples were collected weekly between 11th August and 2nd Septem-ber 2016 at a sampling site in a shallow marine lake, Mrtvo More (Dead Sea) on Lokrum Island near Dubrovnik (South Adriatic, Croatia). In addition to detailed light microscopic analysis, ultrastructural analysis of benthic diatoms from Lake Mrtvo More was performed for the first time using scanning electron microscopy (SEM). A total of 97 taxa were identified in 12 samples. Cocconeis scutellum Ehrenberg and Halamphora coffeiformis (C.Agardh) Levkov were the most frequent taxa in the samples. Shannon-Wiener diver-sity index (H’) values varied from 1.78 (in September on Padina sp.) to 4.52 (in August on glass). According to non-metric multidimensional scaling ordination, there were two groups: epilithon and artificial glass substrate as Group1 and macroalgae as Group2. The results of the analysis showed that the diatom communities developing on artificial sub-strates accurately correspond to the diatom community of a rock substrate and thus can be used as a representative alternative tool for studies of epilithic diatoms in further experiments.

Avifaunal diversity and ecotourism opportunities: A case study from Barachaka tribal village of Bankura, West Bengal, India

Ethnic people throughout the globe are engaged in the conservation of biodiversity. The objective of this study was to measure the avifaunal diversity in heterogeneous forest and paddy fields surrounding the Barachaka tribal village of West Bengal, India and the prospect of development of ecotourism spot in this area. The study was conducted during June and July of 2019 and 2020. A total of 47 bird species belonging to 27 families were identified and recorded during the span of study. Among these bird species, Asian open bill stork (Anastomus oscitans) is predominant in the heterogeneous forest of this village and they usually used this place as a breeding ground during the rainy season. The study reveals that the safety and food security provided by the villagers encourage these birds to prepare colonial nests in trees very near to the human habitation. Shannon-Wiener diversity index value was recorded 2.49 within village forest and 2.33 in the paddy field during June 2019 and July 2019 and 2.62 within village forest and 2.47 in the paddy field during June 2020 and July 2020. Results obtained from the questionnaire survey revealed that tribal people of this village are directly attached to bird conservation in their area and these tribal people protect the bird generation after generation through their traditional knowledge. The community-based bird monitoring programs may protect birds as well as wildlife and encourage researchers who may gather scientific knowledge from these ethnic people. The village under study has the prospective to develop into a good bird watching site, where bird lovers may watch the birds in nature and thereby helping the socio-economic development of the tribal people of this village.

Spatial distribution and diversity inventory of macro-benthic fauna in the Indian Sundarban

In the present study, an attempt was made to document the spatial distribution and diversity inventory of macro-benthic fauna from 21 sampling stations of the Indian Sundarbanfor a period of six months from November 2014 to April 2015. A total of 1,871 individuals belonging to 35 species were recorded which comprised 12 species of molluscs, 20 species of crustaceans, one species each of xiphosurid, sea anemone and fish. The frequency analysis of species revealed that the most dominant species were Telescopium telescopium and Tubuca rosea among molluscs and crustaceans, respectively. The density analysis of the species showed that Pirenella cingulata and T. rosea had maximum values among molluscs and crustaceans, respectively. The average values of Shannon-Wiener diversity index, Simpson diversity index, dominance index and Margalef diversity index were found to be 2.712, 0.888, 0.111 and 4.513, respectively.

Tropical marine fish from Celukan Bawang Port, Buleleng, Bali, Indonesia

Celukan Bawang port is located in Buleleng Regency, Bali, Indonesia. The area of Celukan Bawang Port has a coral reef ecosystem that is very rarely found in Indonesian ports. The coral reef has an important role for coral reef fish as their habitat. This study aims to conduct coral reef fish in the Celukan Bawang port area. A survey was conducted by using UVC (Underwater Visual Census) method at four (4) stations in October 2019. The coral-reef fish family identified in this research consisted of 853 individuals belonging to 14 families and 34 species. The dominant family were Pomacentridae (63.53%), Labridae (25.21%), Achanthuridae (2.70%), Chaetodontidae (1.17%), and Ptereleotrididae (1.17%). The most abundant species were Dascyllus trimaculatus (2270 ind/ha), Halichoeres prosopeion (1550 ind/ha), and Pomacentrus coelestis (95 ind/ha). Shannon-Wiener diversity index value was 2.414, and there were no dominant species observed.

Structure and Composition of Vegetation in Sesaot Protected Forest Nature Tourism in West Lombok-West Nusa Tenggara

The research was carried out in Sesaot Protected Forest Nature Tourism which focused on two locations, namely in front of the Sesaot Resort Office and Wisata Aik Nyet. The purpose of this research is to present data on environmental conditions and the value of the biodiversity index calculation so that this information is important as an evaluation material for forest managers to maintain and even improve the structure and composition of plant species in Sesaot Protection Forest. This research was conducted in three main parts, namely the strengthening of research design and methods, preparation for field work, data collection, and data analysis. The method used is a combination method of transect and double plot methods, namely the transect method consisting of four plots arranged in a double zigzag plot with a size of 20 x 20m for trees, 10 x 10m for shrubs, and 2 x 2m for shrubs. The results showed that the analysis of the calculation of the value of the highest Shannon-Wiener Diversity Index (H ') in front of the Sesaot Resort Office was found on a 10mx10m plot of 2.03 with moderate overflow category. Then, for the highest Shannon-Wiener Diversity Index (H ') value in Aik Nyet Sesaot, which is found in a 10mx10m plot of 1.88 with the medium abundance category.

Relationship between Plant Biodiversity and Carbon Stock in Rural Area of Cisadane Watershed

The main activities in the rural landscape are agriculture, involved natural resources management that compose the function of area as settlement, government services, social services and economy activities. These activities affected the rural landscape that changed plant diversities as well as carbon stock. The aim of this research was to evaluate biodiversity and carbon stock in the rural area of Cisadane Watershed. Two villages were defined on a purposive random sampling, i.e. Sukadamai and Bantarsari. The sampling plots were selected based on main land use type with size for tree was 20 m × 20 m, polewas 10 m x 10 m, sapling was 5 m x 5 m and seedling was 2 m x 2 m; with 3 replications. Similarly, other concentric plots were established. The number of plant species were counted, diameterat breast height (DBH) and height were measured. Then, carbon stock, plant diversity and the relationship was developed. The results showed that main land use in Sukadamai and Bantarsari Village consisted of settlement area, farmland, mixed farming and palm oil plantation. There were 106 species from 43 families that classified into 9 horizontal diversity based on function and 5 vertical diversity based on height. The values of Shannon-Wiener Diversity Index (H’) ranged 2.78–3.20. Estimated carbon stocks were 1.16–51.40 Mg ha−1 in research areas, respectively. These research concluded there was a negative correlation between species richness and diversity index with carbon stock in the village landscapes.

Study of phytoplankton flora and its use as a biomonitoring tool to determine the water quality of Krishnasayar Lake, Burdwan, West Bengal, India

AbstractThe present study focused on biomonitoring approaches involving the phytoplankton composition, density and diversity, and their relationships, with changes in environmental variables, and to determine the pollution status of Krishnasayar Lake in the Burdwan District of West Bengal, India. A total of 29 phytoplankton taxa belonging to Chlorophyceae (13), Cyanophyceae (9), Bacillariophyceae (5) and Euglenophyceae (2) were observed. The phytoplankton density exhibited a maximum value of 12,633 cells/litre in the post‐monsoon season and a minimum value of 7,266 cells/litre in the pre‐monsoon season. The results of two multivariate proficiencies (cluster analysis; CCA) indicated the distribution of phytoplankton groups are influenced by pH, electrical conductivity, and the nitrate, phosphate, potassium and dissolved oxygen concentrations. Various diversity indices, including the Shannon–Wiener Diversity Index, Gleason Species Richness Index, Pielou Evenness Index and Naughton Dominance Index, were explored to illustrate the seasonal phytoplankton fluctuations. The Shannon–Wiener Diversity Index values (2.524, 2.331 and 2.666, respectively, for the pre‐monsoon, monsoon and post‐monsoon seasons) indicate the moderation level of pollution status of the lake. The present study also highlights biomonitoring is a reasonable technique for establishing ecological conditions of lakes by considering the organisms within them, including planktonic algae, macrophytes, benthic macroinvertebrates, crustaceans and fishes on the basis of a single indicator species or a combination thereof. The present study used planktonic algae to determine changes in surrounding environmental conditions. As some of the studied phytoplankton species exhibit specific ecological preferences, their presence can indicate the health of that system. As examples, Coelastrum microporum, Pandorina morum and Euglena viridis indicate high levels of organic pollution. Krishnasayar Lake is integrated with the Krishnasayar ecological park, being affected by large levels of anthropogenic disturbance attributable mostly to uncontrolled and careless activities of some visitors, annual cultural activities, other programmes, etc., meaning relevant management activities are needed to protect the lake from further degradation.