Diversity of Fish in Idanoi River and It’s Relationship to Physical Factors of Water Chemistry

A river is an area through which a body of water moves from a high place to a low place either through the surface or underground which has an average width equal to or more than 5 meters. One of the rivers in Indonesia is the Idanoi river, located in the North Sumatra region, Ononamolo 1 Lot village, Gunungsitoli Selatan sub-district, Nias. This river is inseparable from human activities which affects the condition of river waters as a habitat for aquatic biota. The purpose of this study was to analyze the diversity of fish species in the river Idanoi and to analyze the physical-chemical factors of waters which correlate with the diversity of fish species in the river Idanoi. This study uses the Random sampling method. The results of the research obtained from the four research stations found 1 class, 5 orders, 7 families and 7 species. The highest density value was found at station 1 with a value of 0.023 ind / m2, fish diversity index ranged from 1.072 - 1.829 and the fish uniformity index ranged from 0.92 to 0.98. DO, BOD5 values and oxygen saturation correlated very strongly with fish diversity in river Idanoi village Ononamolo 1 Lot

FAKTOR-FAKTOR LINGKUNGAN ABIOTIK DAN KEANEKARAGAMAN PLANKTON SEBAGAI INDIKATOR KUALITAS PERAIRAN DANAU TOBA (Environmental Abiotic Factors and the Diversity of Plankton as Water Quality Indicators in Lake Toba, North Sumatera, Indonesia)

ABSTRAKPenelitian ini bertujuan untuk mengetahui faktor-faktor lingkungan dan keanekaragaman plankton sebagai indikator kualitas perairan Danau Toba, Sumatera Utara. Penelitian ini dilaksanakan pada bulan April – Mei 2003 pada 3 stasiun pengambilan sampel (Parapat, Simanindo dan Balige). Dari hasil penelitian diidentifikasi sebanyak 93 genera plankton (7 kelompok fitoplankton dan 2 kelompok zooplankton). Dari hasil perhitungan nilai indeks keanekaragaman Shannon-Wiener memperlihatkan bahwa komunitas plankton di ketiga lokasi pengamatan adalah mirip. Nilai indeks keanekaragaman menunjukkan bahwa perairan mengalami pencemaran sedang. ABSTRACTThe aim of the study is to investigate the environmental abiotic factors and the diversity of plankton as water quality indicators in Lake Toba ecosystem, North of Sumatera. The study was done on April to May, 2003 in three sampling stations (Parapat, Simanindo and Balige). Ninety three genera of plankton (seven groups of phytoplankton and two groups of zooplankton) were identified. The calculated values of diversity index (Shannon-Wiener) showed that plankton community in three stations is quite similar. The scores of diversity index were categorized into moderately polluted by organic matters

Similarity Analysis of Understorey Plant Species in Forest Areas

Many forests have substantial understorey plants. These plants have an important contribution to soil and water conservation. The similarity index determines the resemblance of species structure and composition in a community. This research is aimed to see the impact and relationship of changes in the allocation of forest areas to the similarity of understorey species. The research was conducted using the line plot sampling method, sized 2 m x 2 m, with the understorey plants observed have been measured from germination to young plant (height 1.5 m). The number of plots in the plantation forest is 480 plots, protected areas 224 plots, and natural forest 96 plots. Determination of the number of understorey plots based on the minimum representative area curve. A Similarity Index was performed to analyze the data.  The results indicated that there is an impact of changes in the forest area on the similarity of understorey species. It is known from the low similarity index value at the research location. It is due to the differences in environmental factors at the two locations such as air humidity, air temperature, the intensity of sunlight, and different patterns of forest area management

Analysis of Water Quality Pollution Index Asahan river in Tanjungbalai City

The Asahan River, located in the Tanjungbalai city area, is used for plantation, agriculture, animal husbandry activities, toilet washing facilities, hospitals, hotels, settlements, and industry causing the decrease water quality of Asahan River. The purpose of this study was to analyze the water quality and status of the Asahan River water quality in the Tanjungbalai City Area and develop a pollution control  strategy that needs to be implemented to prevent a decrease in the Asahan River water quality in the Tanjungbalai City Area. Purposive sampling technique as used to determine the sampling station. In this study, there were 6 sampling stations based on the activities of the local community with 3 repetitions of sampling. The data analysis techniques from this study are Water Quality Analysis using the Pollution Index (IP) Method and Water Pollution Control Strategy Analysis. The results of water quality analysis based on the pollution index on Asahan river water in Tanjungbalai City show that the average water pollution index is in the moderately polluted category. The maximum of river water pollution index results were at station 2 is 9,086 and the minimum of river water pollution index results were at station 5 is 6,111.Water pollution occurs due to the parameters of phosphate, detergent, oil and grease, and total coliform which have exceeded the quality standard threshold based on Government Regulation of the Republic of Indonesia Number 21 of the year 2022 concerning Management of Water Quality and Control of Class I Water Pollution. Keywords: Asahan River Water pollution Index Water Qualit

The Opportunity of Understorey Species to Absorb Secondary Metabolites in the Soil (Case Study in IUPHHK- Industrial Plantation Forests PT. Toba Pulp Lestari, Tbk)

PT. Toba Pulp Lestari, Tbk is one of the industrial forestry companies with Eucalyptus as the main species. This research was conducted in a concession area located in Aek Nauli Plantation, Simalungun Regency, North Sumatra with an area of 22,533 Ha. The sample of this research is understorey species (height: 1.5 meters) under Eucalyptus stand in cycles 2, 3, 4 and 5 planted in 2015. To find out the composition of plant species, vegetation analysis was conducted initially by making minimum species-area curves to determine the number of plots. The placement of the sample starts with randomly distributed on plotted paths. The number of plots in each cycle is as many as 32 plots, 32 plots, 32 plots, 4 plots by 256 plots and 5 plots for 32 plots. The results of soil analysis found that secondary metabolic in eucalyptus soil classified into terpenoid which located at a distance of 50 cm (flat) and 100 cm (flat) from the tree at 2 years old Eucalyptus stand. The terpenoids also distributed in distance of 50 cm from trees with flat topography on 4 years old Eucalyptus stand. For 6 years old Eucalyptus stand, terpenoid distributed on 150 cm from a tree and there was also a saponin within 150 cm from a tree with sloping topography. If the dominant undergrowth grows were Strong and Senduduk, the secondary metabolism in the soil will be absorbed by this species

Turning organic waste into organic fertilizers in the village Namo Bintang Deli Serdang regency

Community service activities titled Transforming Organic Waste into Organic Fertilizer in Namo Bintang Village in May - November 2019. This activity aims to convert organic waste into organic fertilizer that has economic value, and does not endanger the environment. The method used is counseling, lectures and training as well as monitoring and evaluation with the community directly to the field. Organic waste processing is carried out in several places in the village of Namo Bintang with the approval of the village head and the community. The activities are carried out by means of counseling and lectures, explanations of theories and integrated waste management techniques that are followed by the farmers and scavenger groups of Namo Bintang Village. The community listens to the material delivered by the community service team. The training was conducted by community groups of farmers and scavengers in Namo Bintang Village. Peasant and scavenger community groups are trained by the community service team. All carried out this activity by proactively conducting training to get results in the form of fertilizer from organic waste. The results were reviewed by community groups after 10 days of training to see organic fertilizer. The equipment for utilizing organic waste is also very simple so that community groups can make it themselves. And finally the monitoring and evaluation of the success of monitoring the work in the field will be carried out by going directly to the field together, monitoring by visiting to find out whether the community can do it themselves, besides that the relationship will be carried out by telephone to overcome the problems that arise. In general, community service activities have been successfully carried out and seen a good cooperative relationship between the Higher Education, especially the Implementation Team, government officials and the community in Namo Bintang Village. The village community realizes the importance of saving the environment from increasing their life expectancy because they can make their own fertilizer / compost

Coral Covers and The Abundance of Chaetodontidae in Suaka Alam Perairan of Weh Island Aceh

Pesisir Timur Pulau Weh (PTPW) is a water natural reserve conservation area located in the eastern part of Weh Island. The condition of coral substrates in PTPW has suffered a lot of damage based on bleaching cases that have hit Sabang waters in 2016. Coral conditions can be measured by looking at the abundance of fish indicators of the Chaetodontidae group. Therefore, this study aimed to measure coral conditions and the abundance of Chaetodontidae coral fish, as well as analyze the relationship between the percentage of coral cover and the abundance of Chaetodontidae coral fish. Data of coral were collected using the Point Intercept Transect method with a length of 50 meters, while the abundance of fish used the Underwater Visual Census technique and the Belt Transect method with a length of 50 meters and a total belt width of 5 meters. The results showed that the coral conditions in PTPW were in poor to fair condition with the highest cover at The Sumur Tiga site (36.83%) and the lowest at The Ujung Kareung site (11.5%). The highest abundance of Chaetodontidae fish was found at Ujung Seuke site (1253.3 ind/ha) and the lowest was found at Anoi Itam site (186.7 ind/ha). The results of the correlation analysis between the percentage of coral cover and the abundance of Chaetodontidae coral fish showed a positive relationship (r = 0.482), but it was not significant (p>0.05), and the regression equation obtained Y = 17.16x + 166.52 with a determination coefficient of 18.3%, which indicated that the correlation between the two variables was very weak

Pengantar limmologi

iv, 164 : il.; 25 cm

ASSESSMENT OF OBJECTS AND ATTRACTIONS IN THE KRUENG GEUNIE LHOK KEUTAPANG AREA, PIDIE ACEH REGENCY FOR NATURE TOURISM

Objects and tourist attractions are one of the important elements in the world of tourism. Where objects and tourist attractions can succeed the government's program in preserving the nation's customs and culture as assets that can be sold to tourists and can improve welfare and community participation in preserving the development of a tourist area. The purpose of this study was to determine the potential value of natural tourist attractions. The data collection method was carried out using qualitative methods by conducting in-depth structured interviews, literature studies, field observations and Focus Group Discussions (FGD). Data analysis of the potential objects and natural tourist attractions (ODTWA) is described descriptively and processed using the guidelines for the Analysis of Operation Areas for Natural Tourism Objects and Attractions (ADO-ODTWA). The results showed the ODTWA analysis in the Krueng Geunie area for each criterion of attractiveness 83.33% (adequate), accessibility 91.66% (adequate), socio-economic environmental conditions 58.33% (not feasible), accommodation 66.66% (adequate), 80% (adequate) supporting facilities and infrastructure, and 80% (adequate) clean water availability. Therefore, based on the results of research the Krueng Geunie area deserves to be developed as a natural tourist attraction area

Daily Fluctuation of Planktons Abundance in Percut Sei Tuan Waters, Deli Serdang Regency, North Sumatera

Plankton is an aquatic biota that lives following the currents in the water.  The life of plankton is highly dependent on the water quality in those aquatic environments. The constantly changing physical and chemical conditions of water lead to fluctuations in the abundance of plankton in a water. This study aims to analyze fluctuations in plankton abundance and its correlation with water quality in Percut Sei Tuan Waters. The study was conducted in February and March 2023. Filtration method at 3 stations is the Sampling technique used in this study. The sampling period is carried out in the morning, afternoon, and evening. Data analysis to determine the relationship between variables using Pearson correlation in SPSS version 26. Based on the research results, 42 genera of phytoplankton and 16 genera of zooplankton were found. The highest abundance of phytoplankton was 4.635 Ind/L during the afternoon. The highest abundance of zooplankton was obtained at evening, which was 1.049 Ind/L. This is due to the daily vertical migration of zooplankton and their negative phototactic behavior, while phytoplankton require light for photosynthesis. The research results indicate that the abundance of phytoplankton has a very strong correlation with temperature, light intensity, salinity, TSS, pH, DO, and Nitrate. The abundance of zooplankton is highly correlated with water flow velocity, light intensity, salinity, TSS, TDS, pH, DO, Nitrate, and Phosphate