Dominance Index Value Research Articles

Ruderal Plant Diversity as a Driver for Urban Green Space Sustainability

Urban development in south-eastern Europe has significant ecological consequences, such as a reduction in native plant diversity, the introduction of non-native species, and increased maintenance costs of urban green spaces. Achieving sustainable urban development requires a thorough understanding of the inventory of native plant species to better manage and conserve these areas. This study analyzed 806 vegetation surveys conducted in rural and urban areas over a 30-year period, identifying 450 plant species from 39 distinct plant communities. Our findings revealed generally low dominance index values in all communities, while Shannon diversity index values were particularly high, indicating rich species diversity despite urbanization pressures. Equality index values varied slightly, reflecting differences in species distributions. Principal component analysis (PCA) identified a substantial group of species with low abundance, which is essential for understanding and managing urban biodiversity. These findings have significant implications for urban planning and plant species conservation. Low dominance and high diversity suggest opportunities to improve urban green spaces by integrating diverse native species. In addition, the ecological and practical value of ruderal species, plants that thrive in disturbed environments, was emphasized, as well as their potential in medicine, phytoremediation, green roof design, and pollination services. Through directly correlating biodiversity indices with urban sustainability goals, our study provides useful insights for urban biodiversity management and the strategic integration of native plant species into urban landscapes.

DIVERSITY OF BATS IN HALABAN MONITORING POST AREA, SEI BETUNG, GUNUNG LEUSER NATIONAL PARK

Halaban Monitoring Post, Sei Betung Resort, Gunung Leuser National Park is a rehabilitated forest restoration location since 2017 after previously being diversified from oil palm land. The location has currently become a habitat for various types of animals, including bats. The identification of bat species at the Halaban Monitoring Post is conducted to assess the presence of fauna, with important ecological roles in pollination. Identification was conducted using mist nets installed at five observation points. Our observations showed that 87 individuals of Microchiroptera family bats were found, belonging to 4 species: Cynopterus brachyotis (38 individuals), Cynopterus minutus (15 individuals), Glischropus tylopus (1 individual), Hipposideros cervinus (33 individuals). Further analysis showed Shannon-Wiener diversity index ranges from 0.0 to 0.94 and Margalef species richness index ranges from 0.0 to 0.69. Bat abundance tends to be evenly distributed with an evenness index of 0.0 to 1.35. There is a dominant species at one of the locations with a dominance index value of 0.85.

Community Structure of Sea Urchins (Echinoidea) in the Intertidal Zone of Thomas Beach, Uluwatu

Thomas Beach, located in Uluwatu, Province of Bali, is a rocky shore inhabited by sea urchins. The research aims to discover the habitat characteristics and community structure of sea urchins (Echinoidea) in the intertidal zone of Thomas Beach. Data collection was conducted from April to May 2023 during the lowest tide. A quantitative method with modified line transects was used for data collection. Data collected included the number and species of sea urchins, water quality parameters (temperature, salinity, pH, dissolved oxygen, water clarity, and depth), and substrate types. Data were analyzed using Microsoft Excel, including individual density, diversity index, uniformity index, and dominance index. The research findings revealed five species of sea urchins: Echinotrix calamaris, Echinometra oblonga, Echinometra mathaei, Tripneustes gratilla, and Stomopneustes variolaris. The highest density of sea urchins was found in E. oblonga (16.91 ind/m2). The diversity index values ranged from 0.4936 to 0.8721, indicating a low level of diversity. The uniformity index values ranged from 0.4493 to 0.784, suggesting the community is relatively unstable. The dominance index values ranged from 0.5036 to 0.7166, indicating a moderate level of dominance. The aquatic habitat characteristics, based on the research findings, it was determined that a temperature of 30℃, salinity ranging from 31.77 to 32.76, pH of 8, dissolved oxygen (DO) of 5 mg/l, water clarity of 100%, and a depth ranging from 8.4 to 33.93 cm. The substrate type was rocky at station 1, sandy with seagrass at station 2, and rocky sandy at station 3.

Diversity of soil macrofauna in traditional oil mining of Wonocolo Geosite, Bojonegoro Geopark, East Java, Indonesia

Abstract. Rahmawati LA, Afiati N, Putranto TT. 2024. Diversity of soil macrofauna in traditional oil mining of Wonocolo Geosite, Bojonegoro Geopark, East Java, Indonesia. Biodiversitas 25: 2148-2160. Wonocolo traditional oil mining has been going on for 130 years and has led to soil pollution. This study aims to characterize the composition of macrofauna in the soil affected by Wonocolo's traditional oil mining. The existence of macrofauna is important as a bioindicator of soil quality and its role in maintaining soil fertility levels. Mining areas are grouped based on the density of the oil well (rare, medium and dense), then three sample points are selected in each group. Macrofauna were collected using quadrat-hand sorting, pitfall trap, and flannel trap methods, and then the community structure index was analyzed. The results showed that 709 individuals were collected consisting of 17 orders and 71 species, with 64.8% of individuals found in category-dense areas. Hymenoptera and Polyrhachis sp. as the most abundant order and genus, while Odontomachus brunneus Patton 1894 is the most frequently encountered species. The average value of biodiversity, dominance, and evenness index ranged H'=1.28-1.57 (low), C=0.29-0.38 (low), and E=0.78-0.90 (high), respectively. Indications of environmental conditions in traditional oil mining areas cannot be seen solely from the value of the macrofauna biodiversity index but are apparent in the abundance of the Hymenoptera order in all areas categories and significant presence of Polyrhachis sp. species in the dense category.

Macrozoobenthos Community Structure at Teluk Marunggai Beach, Nagari Sungai Nyalo, Pesisir Selatan District, West Sumatera Province

Teluk Marunggai Beach, Nagari Sungai Nyalo, is one of the new tourist areas in Pesisir Selatan Regency which, over time, will begin to be in demand by tourists, which will have an impact on the life of the biota on the beach, one of which is macrozoobenthos. This research was conducted in March 2023 in the Intertidal Zone of Teluk Marunggai Beach, Sungai Nyalo Village, Koto Ampek Tarusan District, Pesisir Selatan Regency, West Sumatra Province. The purpose of this study was to determine the type and abundance of macrozoobenthos species in the coastal waters of Marunggai Bay and to determine the diversity, uniformity, dominance and distribution patterns of macrozoobenthos in the coastal waters of Marunggai Bay. The research method used is the survey method, where the sampling using the quadrant transect method is carried out at three stations. The research results found 40 species of macrozoobenthos. The most common species found at all stations were Turbo cinereus from the Turbinidae family and the Gastropod class. The macrozoobenthos abundance values ​​obtained ranged from 6.44–6.67 ind/m2. Species diversity index values ​​ranged from 3.06–3.52, namely high. Uniformity index values ​​ranged from 3.02 to 3.14, high uniformity, dominance index values ​​ranged from 0.10 to 0.15; no species dominated, and the value of the distribution pattern ranged from 2.959 to 2.962 with a group distribution pattern

The biodiversity and conservation assessment of Bamui beel in Bangladesh: Current status and threats

A year-long research was conducted with a novel purpose for categorizing and documenting the existing fish diversity and abundance of Bamui beel in Jamalpur district located in Northeast part of Bangladesh, within a time frame from July 2022 to June 2023. A total of 46 fish species were identified that belonged to 18 taxonomical families and 8 orders. The most abundant family was Cyprinidae (25%). Among 46 species, 37% were commonly available (CA) and 11% were abundantly available (AA) in terms of biodiversity status. According to the global conservational status, around 74% were reported as least concerned (LC) whereas 4% were nearly threatened (NT). On the other hand, in consonance with the conservational status of Bangladesh 52% were least concerned (LC) and 11% were endangered (EN). Pielou’s evenness score in Bamui beel was the highest (0.247) in pre-monsoon and the lowest (0.213) in monsoon. Shannon-Weaver diversity index was ranged from 1.992 to 2.114, whereas Simpson’s dominance index value was a maximum of 0.883 in pre-monsoon and a minimum of 0.852 in monsoon. The yearly fish production of the beel was 7.023 metric tons during experimental year. Besides this, small indigenous species (SIS) of fish dominated with 63.34% of the beel's species makeup. Nevertheless, the abundance and diversity of fish species are diminishing daily in this beel. For preserving the fish diversity of Bamui beel calls for the implementation of effective fishery management practices, vigilant monitoring to prevent overfishing, and a strong emphasis on raising awareness among fishermen.

Gastropoda community structure in the mangrove forest of Ketapang Coastal Waters, Rupat District

Gastropod community structure is a concept or study that studies the arrangement or composition of species in an ecosystem. Changes influence the structure of this gastropod community in terms of environmental factors such as temperature, salinity, substrate type, and organic matter content. Rupat District is geographically located in a cluster of islands directly adjacent to the Strait of Malacca, strongly influenced by coastal environmental conditions. Rupat sub-district has one of three tropical marine ecosystems, namely mangroves. This study aims to determine the structure of gastropod communities in mangrove forests in Ketapang Beach, Rupat District waters. The study was conducted in April 2023 using the technique of random sampling with a total of three stations. There are 8 (eight) species of gastropods found, with the species Cerithidea obtusa the dominant one. The abundance of gastropods is 130,000 ind/ha. The value of the diversity index (H') is 1.24, the uniformity index (E) is 0.33, and the dominance index value (C) is 0.40. The distribution pattern (Id) is grouping. The similarity index (Ss) of gastropods between each station in Ketapang Beach is almost the same type and has similarities that are classified as high category. Test results Oneway ANOVA < 0.05. The LSD (Least Significance Difference) test states that the abundance between stations I and III is significant, just as stations II and III are markedly different. The abundance between station I and station II does not differ markedly.

Biodiversity in Swamp Ecosystem in Sukamaju Village, Malind District, Merauke Regency, South Papua Province, Indonesia

Background: The level of diversity has a crucial role in the stability of the ecosystem. The higher the variety, the more stable an ecosystem, including agricultural land cultivated by farmers. Increasing of population affected the higher demanding of community towards their consumption activities. Especially, the natural resources that comes from local area such as Sukamaju District. Biodiversity of resources urgently needed to preserve the ecosystems meanwhile being the potential source to fulfilled nourishment of the people. This study aims to determine the diversity of peatland ecosystems by using a purposive sampling method in every selection of subject groups based on the characteristics or characteristics of a specific population. Methods: Field and Laboratory activities are needed in this research. Sample collection using several methods according to the targeted sample. Most of the sample using purposive sampling but also line intercept transect method. Fish sampling used a fishing gear called a gill net with a mesh size of 2-7 inches. The fish caught is placed in a labeled coolbox. Insect collection was running in the morning at 07.00-11.00 and in the afternoon at 3-5 pm (UTC+09:00). Sampling is held once a month for three months at predetermined coordinate points. Diversity was analyzed using Shannon-Wienner diversity, evenness index, dominance index and intensity on peatlands. Result: The results found seven orders and 30 families, with a total population of 1,231 individuals. The most dominant types of insects are the orders Coleoptera, Hemiptera and Lepidoptera. High diversity index (H'=3.021), high evenness index (E= 0.86243) and low dominance index (D=0.3101). Fish community structure obtained diversity index (H¢) included in the medium category, for uniformity values in the high class and dominance index values in the low sort. The dominant fish species found were Channa striata, Anabas testudineus, Lates calcalifer, Mugil cephalus, Plotosus papuensis and Toxotes chataerus, while Oreochromis niloticus, Oreochromis mossambicus, Hexanematichthys sagor and Megalops cyprinoides. While the types of molluscs found to have the highest abundance were Pila ampullacea, Pomacea canaliculata and Pilsbryoconcha exilis.

Reef fish community structure in the waters of small islands Central Bangka Regency

This study aimed to analyze the community structure of reef fish in the small island waters of Central Bangka. The research was conducted in March 2022 in the waters of Bebuar Island, Ketugar Island, Ketawai Island, and Gusung Asam Central Bangka Regency, Bangka Belitung Islands Province. The coral reef survey method uses purposive sampling and the coral reef fish visual census with data analysis of abundance, diversity index, uniformity, and dominance. In-site water quality measurements included six parameters: temperature, salinity, current, brightness, depth, and pH. The results showed that coral reef cover from 44.60 - 87.00% with the medium to very good category. The abundance of reef fish from 1 to 3 individuals/m2 was dominated by 18 species of the Pomacentridae family. The reef fish diversity index ranged from 2.47 to 2.90, including the medium category. The uniformity index value ranged from 0.79 - 0.94, including the high category, indicating that the species found were evenly distributed across all stations. The dominance index value ranges from 0.07 to 0.15, including low, where no species dominates significantly and the fish are evenly distributed. Temperature, brightness, pH, and salinity are factors that support the growth of coral and reef fish. A water current speed of 0.05 – 0.20 m/s is quite helpful in cleaning coral reefs from mud and can supply oxygen. Water conditions were categorized as good and fulfilled the seawater quality standards.

The diversity of aerial insect in coffee agroforestry, Dampit and Purwodadi district East Java Indonesia

Coffee is one of the export commodities in Indonesia. East Java is one of the largest Coffee supplies with land that is widely spread, such as in Malang and Pasuruan Regencies. The agroforestry system is applied in coffee cultivation, the system has different management from plantations for example the use of shade trees which will affect the structure of aerial insect diversity. Aerial insects play an important role in maintaining the balance of the ecosystem. The research objective was to determine the diversity and dominance of aerial insects in coffee agroforestry in East Java. The research method is exploratory, taking aerial insects using a yellow pan trap. The abiotic factors observed were light intensity, wind speed, temperature and humidity, and data analysis with past 4.03 program. The results of the study found 407 individuals in Dampit coffee agroforestry and 470 individuals in Purwodadi coffee agroforestry. The diversity and dominance index values were found to be the highest in Dampit coffee agroforestry. From the results of the analysis of abiotic factors, it is found that temperature and humidity in Dampit coffee agroforestry have higher values while wind speed and sunlight intensity of Purwodadi coffee agroforestry have higher values. The differences in the number and types of insects as well as the differences in the diversity and dominance index obtained, explained that the two study sites had differences in abiotic factors and shade trees.

KEANEKARAGAMAN MAKROZOBENTOS DI SUNGAI SUMBER NGENEP KECAMATAN KARANGPLOSO KABUPATEN MALANG

Rivers are a water source that has many roles in people's lives and is inhabited by many organisms. The quality of water can be seen from the number of organisms that live in that water. Organisms that can be used as biological indicators are macrozoobenthos. Macrozoobenthos are organisms whose movement characteristics tend to be limited and where they live permanently. The way to find indications of pollution in a river is to calculate the diversity of macrozoobenthos populations in the riverbed. The purpose of this study was to determine the diversity of macrozoobenthos in the Sumber Ngenep River, Karangploso District, Malang Regency. This research is quantitative research with an exploratory method. Sampling was carried out at 3 stations with 3 repetitions at each station. Identification using 3 literature and data analysis using the Shannon-Wiener Diversity Index (H') and Simpson Dominance Index (D). The research results obtained 10 macrozoobenthos genera. The diversity index value of station 1 (1.389), station 2 (1.638), station 3 (1.343). Dominance index value of station 1 (0.286), station 2 (0.262), station 3 (0.309).

Diversity of Butterfly Types (Lepidoptera: Rhopalocera) Based on Altitude Variations in Sibayak II Forest, North Sumatra

Butterflies belong to the order Lepidoptera which has essential roles such as pollinating insects (pollinators), evaluating environmental quality, and indicators of habitat change. The research aims to determine the types of butterflies, diversity, relative abundance, and dominance index in the Sibayak II Forest area of North Sumatra. This research is a quantitative descriptive research by combining the cruising method and the VES method. Sampling was carried out at three altitudes 1300-1500 masl, 1500-1700 masl, and 1700-1900 masl using insect nets. The results obtained were 31 species of butterflies from 6 families, with the highest number of individuals from three heights, namely Mycalesispatiana in Sibayak II Forest, North Sumatra. The index value of butterfly species diversity in Sibayak II Forest with an average value of 2.67 is included in the medium category. The relative abundance index value of the most abundant butterfly species is the Mycalesis patiana with a discount of 34%. The overall butterfly dominance index value is 0.124. Based on the species diversity index, relative abundance and dominance index indicate environmental conditions in accordance with the life cycle and food sources as well as the distribution of host plants in Sibayak II Forest.

Diversity of Orchids (Orchidaceae) in Bonjol Subdistrict, West Sumatra

Bonjol District, West Sumatra has a very high diversity of flora, one of the flora found in Bonjol District is orchids (Orchidaceae). However, there is no data that explains the diversity of orchid plants in Bonjol District, so researchers are interested in using this as research. This research aims to find out what types of orchids are found in Bonjol District, the diversity index of orchid plants (Orchidaceae) and the dominance index of the most dominant orchid plants in Bonjol District, West Sumatra. The research was carried out using an exploratory method with direct observation of orchid plants in the field. The sampling method used was purposive sampling, namely taking samples with certain considerations. Sampling was carried out at 2 stations, namely residential areas and forests. Data analysis used the Shannon-Wiener diversity index. The research results showed that the diversity of orchid species (Orchidaceae) in Bonjol District, West Sumatra was classified as moderate, with a total Shannon-Wiener diversity index H' = 1.4117. In Bonjol District, West Sumatra, there are 31 types of orchids from 17 genera, the most frequently found species are Bulbophyllum gibbosum with 35 individuals, while the species found least frequently are Nervelia crociformis and Eria discolor, each with 2 individuals. Then, in the results of calculating the dominance index value for orchids (Orchidaceae) in Bonjol District, West Sumatra, the result was D= 0.044, which means that no species dominates.

KEANEKARAGAMAN JENIS KUPU-KUPU (PAPILIONOIDEA) DI GUNUNG API PURBA NGLANGGERAN [The Diversity of Butterflies (Papilionoidea) at Nglanggeran Ancient Volcano

The presence of butterflies can be found in several types of habitats and can be used as an indicator of environmental conditions. Geologically, the Nglanggeran Ancient Volcano is unique and has high scientific value. It is necessary to update the butterfly diversity data to determine the diversity of butterflies at Nglanggeran Ancient Volcano. The purpose of this study was to determine the diversity, richness, evenness, and dominance of butterfly species at Nglanggeran Ancient Volcano. The exploration method was carried out to obtain data for three repetitions. There were 51 butterfly species with a total of 584 individuals, consisting of Nymphalidae (54.55%), Papilionidae (21.82%), Pieridae (20.00%) and Lycaenidae (3.64%). The index value of butterfly species diversity at Nglanggeran Ancient Volcano (2.97) was medium. The species evenness index (0.83) indicated that the species was relatively stable and evenly distributed. The richness of butterfly species was high, i.e. 6.70, suggesting that the current habitat was suitable for the life of the butterflies. The dominance index value was low, i.e. 0.12, indicating that there was no domination of certain species. The abundant species were Eurema sp. (23.12%), Ideopsis juventa (7.02%), and Catopsilia pomona (6.85%).

Biological features of the white bream Blicca bjoerkna (Linnaeus, 1758) from Cuciurgan

The ichthyocenosis of the Cuciurgan reservoir of the Moldovan Thermal Power Plant is home to the common bream, an eudominant species with a dominance index value (D5) of 53.07 % in catches taken with 25 x 25 mm – 40 x 40 mm mesh gillnets. Currently, the number of white bream is at a stable level with a tendency to remain approximately constant over the next few years. The absolute linear dimensions (L) of the common bream in the Cuciurgan reservoir range from 4.8-31 cm, standard length (l) – from 3.8 to 24.5 cm. Body weight reaches 334 g. The gender structure of the common white bream population in this ecosystem demonstrates the dominance of females in the ratio of 2:1. The reservoir’s white bream is characterized by a high fattening ratio, which according to Clark is 1.96 ± 0.013. A small part of the white bream (1.5 %) in the Cuciurgan reservoir uses fish species as trophic resources.

Diversity Of Coleoptera Order Soil Insects In Kerandangan Nature Park Area

Diversity Of Coleoptera Order Soil Insects In Kerandangan Nature Park Area TWA Kerandangan is a conservation area located in West Nusa Tenggara Province. There are types of plants and animals in TWA Kerandangan that show acceptable and stable ecosystem conditions based on the role of insects. One type of insect that plays a role in the balance of the ecosystem is soil insects because they are considered good organic matter breakers. The order of soil insects that has a valuable role in the ecosystem is Coleoptera-decomposing wildlife feces. Analysis of their diversity is very important for the sustainability of the ecosystem in Kerandangan TWA. The research method used was pitfall trapping. The diversity level of the Coleoptera diurnal group is included in the low category because it has an average index value of 0.93, and the level of diversity of the Coleoptera nocturnal group is included in the medium category because it has an average index value of 1.34. The dominance index value is < 0.50, which indicates that no species dominates at each station, and the level of evenness is in the low to high category. The most common Coleoptera species found is Onthophagus sp 4, and Onthopagus taurus belongs to the dung beetle group (Scarabaeidae).

Echinoderms as a Bioindicator of Water Quality of Weda Waters, Central Halmahera District

Echinoderms are deposit feeders that digest most of the sediment. Echinoderms are also good aquatic bioindicators, because Echinodermata are relatively calm or have low mobility, so they are highly influenced by environmental factors. This study aimed to determine the community structure of Echinoderms and their distribution relationship with several aquatic physico-chemical factors. Echinodermata sampling was carried out using the belt transect method using three stations. Data were collected in the form of the number of echinoderms in the transect and physico-chemical parameters of the waters including temperature, salinity, turbidity, pH, dissolved oxygen, ammonia, nitrite, and nitrate. From the results of research at three station points in the waters of Weda waters, 9 species of Echinodermata were found, namely Protoreaster nodosus, Linckia laevigata, Culcita novaeguineae, Diadema setosum, Diadema savigny, Echinometra mathaei, Tripneusteus gratilla, Holothuria atra, Holothuria edulis which were grouped into 3 classes, 4 orders, 6 families, and 7 genera with a total of 139 individuals. The diversity index of Echinodermata in Weda waters was classified as moderate with an average value of 1.05, the uniformity index was classified as moderate with an average value of 0.56, and the average dominance index value was 0.28 meaning that no species dominated

The Structure of Mangrove Community in The Waters of Pare Mas Jerowaru East Lombok

Mangrove communities grow well in the tropics and are able to adapt to extreme environments, such as: high temperature, high salinity, extreme tides, high sedimentation, and oxygen-poor growing substrate conditions. Information about mangrove ecology is very important to provide an overview of the current condition of mangroves. The aim of this research is to determine the structure of the mangrove community in Pare Mas Jerowaru, East Lombok. This research used a purposive sampling method and a combination of line and quadrat transects. The research results obtained 3 types of mangroves in Pare Mas waters. The diversity index value is in the low category and the dominance index value is medium to high. The species Rhizophora apiculata had the highest frequency value (0.57 ind/m²) and the lowest was Avicennia marina (0.10 ind/m²). Density at the tree level is in the sparse category, while at the pole, sapling and seedling level it is in the medium to very dense category. The types of mangroves that have the highest cover values in the tree, pole and stake categories are Sonneratia alba and Rhizophora apiculata. The highest INP values in the categories of trees, poles, saplings and seedlings were 272.99% (Sonneratia alba), 173.58% (Sonneratia alba), 215.51% (Rhizophora apiculata) and 200.00% (Rhizophora apiculata).

Diversity of Gastropods and Bivalvia in Jukung Bay Waters, Pemongkong Village, Jerowaru District, East Lombok Regency

Several activities affect the distribution of gastropods and bivalves, one of which is the activity of the community around the coast which is thought to affect water quality. The entry of organic and inorganic contaminants into coastal waters is thought to cause a decrease in water quality followed by changes in physics, chemistry and biology. The purpose of this study was to determine the diversity of gastropods and bivalves in the waters of Jukung Bay, Ujung Betok Hamlet, Pemongkong Village, Jerowaru District, East Lombok Regency. This research was conducted in Ujung Betok Hamlet (Tukung Bay Waters), Pemongkong Village, Jerowaru District, East Lombok Regency. the study was conducted from October 2022 to July 2023. The results showed that the highest species abundance was found in the Gastropoda class Nassarius sp with an abundance of 31 individuals/m2. The highest gastropod and bivalves diversity index value was obtained at point 3, namely 0.42 individuals/m2. The highest gastropod and bivalves uniformity index value was obtained at point 2 with a uniformity index value of 0.28. The dominance index value obtained was 0.1-0.56 individuals/m2 included in the moderate dominance category. Based on the results and discussion it is known that the abundance of gastropods and bivalves in the coastal waters of Jukung Bay which were analyzed totaled 108 individuals. The diversity index (H') obtained in this study ranged from 0.41-1.39 individuals/m2. The uniformity found ranged from 0.14 to 0.28 individuals/m2. The dominance index obtained ranged from 0.1 to 0.56 individuals/m2.

BIODIVERSITY AND ABUNDANCE OF PHYTOPLANKTON IN RICE-FISH FARMING SYSTEM

Rice-fish farming system that is purposed to maximize land use by adding fish farming to its systems. In the Rice-fish farming system, the fish farm serves as a solution to overcome pests so it can provide benefits for the farmers. Fish farm maintenance is considered to be a solution to reduce farmers expenditures in the use of fertilizers. The reason is in the fish-maintaining process, fish will naturally excrete dirt which has a function as organic fertilizer which will increase the fertility of the waters. The purpose of this study was to determine the composition of phytoplankton as well as the physical and chemical quality of the water in several Rice-fish farming system stations in Panembangan Village so that the condition of the ecosystem can be detected whether it is in good or bad condition. The Results showed that the diversity index value ranged from 0.61-1.99. The uniformity index value was obtained in the range of 0.15 – 0.50 and the dominance index value was obtained in the range of 0.20 – 0.72. While, the four stations still have good water quality, the conditions in the Rice-fish farming system area of Panembangan Village are still suitable for the growth of organisms.