scholarly journals Analisis pencemaran antropogenik dan struktur komunitas diatom planktonik sebagai indikator pencemaran perairan di Selat Air Hitam

Jurnal Zona ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 45-51
Author(s):  
Miduk Tampubolon ◽  
Yusni Ikhwan Siregar ◽  
Sofyan Husein Siregar
Keyword(s):  
Regression Analysis ◽  
Community Structure ◽  
Pollution Source ◽  
Processing Plant ◽  
Sampling Station ◽  
Effluent Water ◽  
Domestic Activity ◽  
Marine Traffic ◽  
Ecosystem Condition ◽  
Biodiversity Index

The present study aimed at identify population characters pollution source which affect water fertily nitrate, phospate, abundance as well as community structure of planctonic diatomae were measured. Nine sampling station of three location were established a long the Selat Air Hitam water. Appearently domestic activity, marine traffic, sago processing plant and community economic had affected on water fertility  due to effluent water that entered the water. Nitrate analysis showed a range of 187,5 to 262,5 µg/L mean while phospate consentration appear 28,8- 241,2 µg/L, silicate consentration appear 30,4-32,9 µg/L. Plactonic diatomae abundance came up 2400 to 3800 cell/L of nine genera. Biodiversity index of range  (1≤H’≤3), while smiliarity index (0,5≤E≤1) and dominancy index (0,5≤E≤1). Those index indicate nthe Selat Air Hitam waters in a medium pressure, however ecosystem condition is stable. Nitrate, phospate and silicate positively and significantly correlated with diatomae abundance ( p0,05). TSS level appeared 18,33 – 45,00 mg/l and BOD berkisar 3,73 – 5,07 mg/l. Regression analysis showed that nitrate and phospate had a mayor affect to diatomae abundance.

scholarly journals Phylogenetic Diversities and Community Structure of Members of the Extremely Halophilic Archaea (Order Halobacteriales) in Multiple Saline Sediment Habitats

2011 ◽  
Vol 78 (5) ◽  
pp. 1332-1344 ◽  
Author(s):  
Noha H. Youssef ◽  
Kristen N. Ashlock-Savage ◽  
Mostafa S. Elshahed
Keyword(s):  
Community Structure ◽  
Salt Lake ◽  
Great Salt Lake ◽  
Halophilic Archaea ◽  
Wide Distribution ◽  
Rrna Gene ◽  
Processing Plant ◽  
Content Type ◽  
Mangrove Tree ◽  
Rare Biosphere

ABSTRACTWe investigated the phylogenetic diversity and community structure of members of the halophilicArchaea(orderHalobacteriales) in five distinct sediment habitats that experience various levels of salinity and salinity fluctuations (sediments from Great Salt Plains and Zodletone Spring in Oklahoma, mangrove tree sediments in Puerto Rico, sediment underneath salt heaps in a salt-processing plant, and sediments from the Great Salt Lake northern arm) usingHalobacteriales-specific 16S rRNA gene primers. Extremely diverseHalobacterialescommunities were encountered in all habitats, with 27 (Zodletone) to 37 (mangrove) different genera identified per sample, out of the currently described 38Halobacterialesgenera. With the exception of Zodletone Spring, where the prevalent geochemical conditions are extremely inhospitable toHalobacterialessurvival, habitats with fluctuating salinity levels were more diverse than permanently saline habitats. Sequences affiliated with the recently described generaHalogranum,Halolamina,Haloplanus,Halosarcina, andHalorientalis, in addition to the generaHalorubrum,Haloferax, andHalobacterium, were among the most abundant and ubiquitous genera, suggesting a wide distribution of these poorly studied genera in saline sediments. TheHalobacterialessediment communities analyzed in this study were more diverse than and completely distinct from communities from typical hypersaline water bodies. Finally, sequences unaffiliated with currently described genera represented a small fraction of the totalHalobacterialescommunities, ranging between 2.5% (Zodletone) to 7.0% (mangrove and Great Salt Lake). However, these novel sequences were characterized by remarkably high levels of alpha and beta diversities, suggesting the presence of an enormous, yet-untapped supply of novelHalobacterialesgenera within the rare biosphere of various saline ecosystems.

scholarly journals Model of baddeleyite recovery from dump products of an apatite-baddeleyite processing plant using a CVD6 concentrator

2021 ◽  
Vol 248 ◽  
pp. 281-289
Author(s):  
Vladislav Pelikh ◽  
Valery Salov ◽  
Alexander Burdonov ◽  
Nikita Lukyanov
Keyword(s):  
Regression Analysis ◽  
Main Idea ◽  
Continuous Variable ◽  
Coarse Grained ◽  
Group Method ◽  
Processing Plant ◽  
Technological Parameters ◽  
Fine Grained ◽  
Processing Plants ◽  
Valve Opening

The paper is devoted to developing a model of baddeleyite recovery from dump products of an apatite-baddeleyite processing plant using centrifugal concentrators. The relevance of the work arises from the acquisition of new knowledge on the optimization of technological parameters of centrifugal concentrators using Knelson CVD (continuous variable discharge) technology – in particular, setting the frequency of valve opening and the duration of valves remaining open. The purpose of the research was to assess the applicability of CVD technology in the treatment of various dump products of the processing plant and to build a model of dependencies between the concentrate and tailings yields and the adjustable parameters, which will allow to perform preliminary calculations of the efficiency of implementing this technology at processing plants. The research objects are middling and main separation tailings of the coarse-grained stream and combined product of main and recleaner separation tailings of the fine-grained stream. The study uses general methods of mathematical statistics: methods of regression analysis, aimed at building statistically significant models, describing dependence of a particular variable on a set of regressors; group method of data handling, the main idea of which is to build a set of models of a given class and choose the optimal one among them. Authors proposed an algorithm for processing experiment results based on classical regression analysis and formulated an original criterion for model selection. Models of dependencies between the concentrate and tailings yields and the adjustable parameters were built, which allowed to establish a relationship between the concentrate yield and the valve opening time, as well as a relationship between the tailings yield and the G-force of the installation.

scholarly journals Characterization of epibenthic community structure in the Beaufort Sea area

2018 ◽  
Author(s):  
Laure de Montety ◽  
Philippe Archambault ◽  
Andrew R Majewski ◽  
Cindy Grant ◽  
James D Reist
Keyword(s):  
Community Structure ◽  
Fish Habitat ◽  
Organic Matter Content ◽  
Beaufort Sea ◽  
Matter Content ◽  
Ecological Indicator ◽  
Sediment Grain Size ◽  
Marine Traffic ◽  
Amundsen Gulf ◽  
Sea Area

The Canadian Arctic is facing new issues with increased marine traffic, exploration and exploitation of resources. Knowledge of the environment is needed to address these issues. Fisheries and Oceans Canada conducted a survey during summers 2012 to 2014 in the Canadian Beaufort Sea and the Amundsen Gulf. The “BREA-MFP” Beaufort Regional Environmental Assessment-Marine Fish Project” objective was to improve knowledge of the composition of fish communities and their habitats in offshore waters of the Beaufort Sea and the Amundsen Gulf. As an important part of the fish habitat and diet, the epibenthos was sampled to characterize and improve the knowledge of epibenthic community structure (diversity and abundance) in these areas. The benthos is ideal as an ecological indicator index because organisms are sessile, highly diverse, and long-lived. Moreover, environmental factors such as organic matter content, benthic Chla, and sediment grain size are known to influence the benthic community composition. Collected data are used to establish baselines for epibenthic diversity, abundances, and community compositions, and for comparisons among regions (Beaufort Sea, Amundsen Gulf) and gradients (nearshore-offshore depth, East-West). Furthermore, the study highlighted new occurrences of species for the area indicating additional studies are needed to assess benthic biodiversity in this area.

scholarly journals Characterization of epibenthic community structure in the Beaufort Sea area

2018 ◽  
Author(s):  
Laure de Montety ◽  
Philippe Archambault ◽  
Andrew R Majewski ◽  
Cindy Grant ◽  
James D Reist
Keyword(s):  
Community Structure ◽  
Fish Habitat ◽  
Organic Matter Content ◽  
Beaufort Sea ◽  
Matter Content ◽  
Ecological Indicator ◽  
Sediment Grain Size ◽  
Marine Traffic ◽  
Amundsen Gulf ◽  
Sea Area

The Canadian Arctic is facing new issues with increased marine traffic, exploration and exploitation of resources. Knowledge of the environment is needed to address these issues. Fisheries and Oceans Canada conducted a survey during summers 2012 to 2014 in the Canadian Beaufort Sea and the Amundsen Gulf. The “BREA-MFP” Beaufort Regional Environmental Assessment-Marine Fish Project” objective was to improve knowledge of the composition of fish communities and their habitats in offshore waters of the Beaufort Sea and the Amundsen Gulf. As an important part of the fish habitat and diet, the epibenthos was sampled to characterize and improve the knowledge of epibenthic community structure (diversity and abundance) in these areas. The benthos is ideal as an ecological indicator index because organisms are sessile, highly diverse, and long-lived. Moreover, environmental factors such as organic matter content, benthic Chla, and sediment grain size are known to influence the benthic community composition. Collected data are used to establish baselines for epibenthic diversity, abundances, and community compositions, and for comparisons among regions (Beaufort Sea, Amundsen Gulf) and gradients (nearshore-offshore depth, East-West). Furthermore, the study highlighted new occurrences of species for the area indicating additional studies are needed to assess benthic biodiversity in this area.

scholarly journals STRUKTUR KOMUNITAS ANNELIDA SEBAGAI BIOINDIKATOR PENCEMARAN SUNGAI ANCAR KOTA MATARAM

2019 ◽  
Vol 7 (1) ◽  
pp. 42
Author(s):  
Iwan Doddy Dharmawibawa
Keyword(s):  
Community Structure ◽  
Environmental Changes ◽  
Negative Impact ◽  
Lumbricus Terrestris ◽  
River Pollution ◽  
Household Waste ◽  
Sampling Station ◽  
Water Spinach ◽  
Qualitative Approaches ◽  
The Impact

Ancar River is a river that is used by many residents for various activities, such as agricultural activities, fisheries, and planting water spinach. In addition to these activities, the Ancar River is also used as a place for domestic waste disposal and disposal of the tofu waste industry so that it can have a negative impact on water resources, including causing a decrease in water quality. The Annelida response to environmental changes can be used to see the effect of various activities, such as the impact of industrial activities, agriculture, and land use. This study aims to assess the community structure of Annelida as bioindicators of the waters against the content of polluted material found in the Ancar River. This research is descriptive explorative, using quantitative and qualitative approaches. This study uses the "Sampling Purposive" method, which is the determination of the observation station based on the use of land around the Ancar River environment. Each sampling station is carried out in 3 points, namely left, center and right of the river. Annelida obtained in the Ancar River consist of two classes namely Oligochaeta and Hirudinea. Oligochaeta class consists of Tubifex sp., Lumbricus terrestris, Hirudinea class consisting of Hirudo medicinalis. The community structure of Annelida can be used as a indicator of river pollution. From the results of the study it was found that the Ancar River had experienced pollution caused by organic matter both from household waste and tofu industrial waste. Based on the BOD value it is known that station 1 is categorized as uncontaminated location, stations 2 and 4 are lightly polluted, and stations 3, 5 and 6 are moderately polluted.

scholarly journals Grazing intensity on the plant diversity of alpine meadow in the eastern Tibetan plateau

Rangifer ◽  
2004 ◽  
pp. 9-15 ◽  
Author(s):  
Wu Ning ◽  
Liu Jian ◽  
Yan Zhaoli
Keyword(s):  
Community Structure ◽  
Tibetan Plateau ◽  
Plant Diversity ◽  
Alpine Meadow ◽  
Grazing Intensity ◽  
Eastern Tibetan Plateau ◽  
Rangeland Degradation ◽  
Biodiversity Index ◽  
The Relationship ◽  
Kobresia Pygmaea

Because ofthe remoteness and harsh conditions of the high-altitude rangelands on the eastern Tibetan Plateau, the relationship between yak grazing and plant diversity has not been so clear although livestock increase was thought as the main issue leading to the degradation of rangeland. In the debate of rangeland degradation, biodiversity loss has been assumed as one of the indicators in the last two decades. In this paper authors measured the effects of different grazing intensities on the plant diversity and the structure of Kobresia pygmaea community in the case-study area, northwestern Sichuan. The results indicated that plant diversity of alpine meadow has different changing trends respectively with the change of grazing intensity and seasons. In June the highest plant diversity occurred in the intensively grazed (HG) plots, but in July and September species biodiversity index of slightly grazed (LG) plots is higher than other experimental treatments. In August the intermediate grazed (IG) plots has the highest biodiversity index. Moreover, it was found that intensively grazing always leads to the increase of plant density, but meanwhile the decrease of community height, coverage and biomass. Over-grazing can change the community structure and lead to the succession from Kobresia pygmaea dominated community to Poa pratensis dominated. Analyzing results comprehensively, it can be suggested that the relationship between grazing intensity and plant diversity is not linear, i.e. diversity index is not as good as other characteristics of community structure to evaluate rangeland degradation on the high altitude situation. The change of biodiversity is so complicated that it can not be explained with the simple corresponding causality.

scholarly journals Phytoplankton Community Structure as Bioindicator of Water Quality in Floating Net Cage Area with Different Density at Cirata Reservoir

2020 ◽  
pp. 19-30
Author(s):  
Mohamad Rizki Ramadhan Nida Fathan ◽  
Zahidah Hasan ◽  
Izza Mahdiana Apriliani ◽  
Heti Herawati
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Phytoplankton Community ◽  
Diversity Index ◽  
Sampling Station ◽  
Hydroelectric Power ◽  
Phytoplankton Community Structure ◽  
Saprobic Index ◽  
Net Cage ◽  
The Government

Cirata Reservoir is built with water sources originating from the Citarum River. Cirata Reservoir mainly use as a hydroelectric power plant and fish cultivation area with a floating net cage system. The utilization of a reservoir for the cultivation of fish in the Cirata Reservoir had exceeded the specified capacity by the government. That matter had caused the water quality to change in waters of the Cirata Reservoir. Phytoplankton is the first organism that is affected because the degradation of water quality. The purpose of this research is to determine the structure community of phytoplankton in floating net cage areas with different density and water flow at Cirata Reservoir. This research was conducted on November 16 - December 8 of 2019 in the Cirata Reservoir with sampling station located at Jangari, Meleber, and Patokbeusi. The method that was used in this research was purposive sampling method. The result of physic-chemical parameter of this research showed that temperature at all station ranged between 31,9-34,5°C, transparency 53,5-76 cm, pH 6,87-7,67, CO2  8,4-16,8 mg/L, BOD5 1,1-20,5 mg/L, DO 5,83-9,72 mg/L, nitrate 0,169-0,241 mg/L, ammonia 0,001-0,241 mg/L, and phosphate 0,131-0,195 mg/L. The result of phytoplankton community structure indicated that composition of phytoplankton had 30 genera with Chlorophyceae class as the most dominant. The abundance of phytoplankton during research was ranged between 49.570-338.450 ind/L, diversity index 0,78-0,88, domination index 0,12-0,22, and saprobic index 1,04-1,59. Saprobic index indicated that water in each station was included in mild to moderate pollution category or in the β-Meso/ oligosaprobic phased which was showed by the large number of Gloeocystis and Glenodinium genera.

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