scholarly journals THE ANALYSIS OF OIL CONTENT IN SEDIMENT AND COMMUNITY STRUCTURE OF MACROZOOBENTHOS IN BELAWAN WATERS OF MEDAN CITY, NORTH SUMATERA PROVINCE

2020 ◽  
Vol 3 (2) ◽  
pp. 167-178
Author(s):  
Doli Juna Setia Tanjung ◽  
Bintal Amin ◽  
Syafruddin Nasution
Keyword(s):  
Community Structure ◽  
Linear Regression ◽  
Oil Content ◽  
Diversity Index ◽  
The Other ◽  
Regression Analyses ◽  
Simple Linear Regression ◽  
Dominance Index ◽  
Ocypode Quadrata ◽  
Evenness Index

This research was conducted in March 2019 to determine the oil content in sediment, it’s community structure of macrozoobenthos and it’s a relationship in Belawan Waters of Medan City, North Sumatera. Four sampling stations with five replications in each station were surveyed. The results showed that the average oil content in sediments exceeded the threshold had set by the National Academy of Science. Macrozoobenthos found consists of Ocypode quadrata, Scyla serrate, Rotun dicauda, Penaeus sp, Murex tribulus, and Nassarius olivaccus. The highest abundance was in Station 3 and the lowest was in Station 2. The diversity index in each station was generally very low. Dominance Index in Station 4 was medium, whilst the other stations were high. Evenness index showed in Station 3 and 4 were in high population, Station 1 was in medium population and Station 2 was in low population. Simple linear regression analyses between oil content in sediment with community structure of macrozoobenthos indicated negative correlation ( Y = 10,5-0,0001x , R2 = 0,0004 and r = 0,02 ) which indicated that the higher the oil content, the lower the macrozoobenthos abundance in sediment.

Study on the community structure of macrozoobenthos in Kobok and Kao estuaries, Kao Bay, North Halmahera

2014 ◽  
pp. 62
Author(s):  
Najib Hi Talib ◽  
Lawrence J.L Lumingas ◽  
Markus T Lasut
Keyword(s):  
Community Structure ◽  
Species Diversity ◽  
Diversity Index ◽  
Factorial Correspondence Analysis ◽  
Species Diversity Index ◽  
Dominance Index ◽  
Sediment Types ◽  
As Species ◽  
Evenness Index ◽  
Community Variables

This study aims to assess the community structure of macrozoobenthos in the estuary of Kobok and Kao rivers, Kao Gulf waters. Sampling was carried out in October 2014 at 10 sampling stations in both estuaries. Variables examined in this study were community variables, such as species composition and abundance, including species diversity index Shannon-Wiener (H '), species richness (SR) index, evenness index (J'), Berger-Parker dominance index (d) and 'assemblage' (group) of the macrozoobenthos using multivariate analysis such as classification and analysis of factorial correspondence analysis (AFK). This study obtained a total of 757 individuals of 61 species. Diversity Index (H ') ranged from 1.62 to 3.96, Evenness index (J ') from 0.63 to 1.26., richness (SR) index ranged from 2.83 to 4.45 and dominance index (d) 0.16 to 0.47. Classification analysis separated 4 interconnecting groups at the station or resident species that were in the similar sediment types. Correspondence Factorial Analysis for the station variables mostly responsible for the axial formation was stations mostly contributing  to the formation of axes as the characteristic station of the axes, because it had relatively high contribution. Penelitian ini bertujuan untuk menilai struktur komunitas makrozoobentos di muara Sungai Kobok dan muara Sungai Kao perairan Teluk Kao. Pengambilan sampel dilaksanakan pada bulan oktober 2014 pada 10 stasiun sampling di kedua muara. Variabel yang dikaji dalam penelitian ini adalah variabel komunitas seperti komposisi dan kelimpahan spesies termasuk indeks keanekaragaman spesies Shannon-Wiener (H’), indeks kekayaan spesies (SR), indeks kemerataan spesies (J’), indeks dominasi Berger-Parker (d) serta ‘assemblage’ (grup) makrozoobentos dengan menggunakan analisis multivariate seperti analisis klasifikasi maupun analisis faktorial koresponden (AFK). Penelitian ini diperoleh total 757 individu yang termasuk dalam 61 spesies. Nilai Indeks Keanekaragaman (H’), berkisar dari 1.62-3,96. Nilai Indeks Kemerataan Spesies (J’), berkisar dari 0,63-1,26. Nilai Indeks kekayaan spesies (SR), berkisar dari 2,83-4,45 dan Nilai indeks dominasi (d), berkisar dari 0,16-0,47. Analisis klasifikasi telah memisahkan 4 grup yang saling berhubungan pada stasiun maupun spesies penghuni yang memiliki kemiripan dalam tipe sedimen. Sedangkan Analisis Faktorial Koresponden untuk variabel stasiun yang paling bertanggungjawab terhadap pembentukan sumbu-sumbu adalah (kontribusi absolut). Stasiun-stasiun yang paling berkontribusi dalam pembentukan sumbu juga sebagai stasiun karakteristik sumbu tersebut, karena memiliki kontribusi relatif yang juga tinggi.

scholarly journals Biodiversity of Fishes in Musi Estuary, South Sumatra, Indonesia

2020 ◽  
Vol 9 (2) ◽  
pp. 192-198
Author(s):  
Fitri Agustriani ◽  
Anna Ida Sunaryo Purwiyanto ◽  
Wike Ayu Eka Putri ◽  
Fauziyah Fauziyah
Keyword(s):  
Community Structure ◽  
Data Collection ◽  
Diversity Index ◽  
Stable Condition ◽  
High Availability ◽  
Fishing Ground ◽  
Dominance Index ◽  
Average Value ◽  
Gill Net ◽  
Evenness Index

Agustriani F, Purwiyanto AIS, Putri WAE, Fauziyah F. 2020. Biodiversity of fishes in musi estuary, South Sumatra, Indonesia.  Jurnal Lahan Suboptimal : Journal of Suboptimal Lands 9(2): 192-198.The high activity in the Musi estuary will have an impact on fishes diversity. This research aimed to analyse the biodiversity of fishes in the Musi estuary in South Sumatra. An experimental fishing method was used for data collection by fishing ground following the local fishermen habit using gillnet millennium. The abundance of fish species found were 21 species and 16 families. The main catch was Hemibagrus nemurus with a high relative abundance (RA) of 35.4% but the high availability frequency of 100% is Eleutheronema tetradactylum. The average value of the moderate diversity index (H'= 1.47), the moderate evenness index (J'= 0.48) and the low dominance index (D= 0.32). This condition shows that the community structure of the species captured by the gill net is in a fairly stable condition with the number of species that are spread fairly evenly and no species dominate each other.

scholarly journals STRUKTUR KOMUNITAS PLANKTON PERMUKAAN PADA DANAU LABUAN CERMIN KEC. BIDUK-BIDUK, KAB. BERAU

2018 ◽  
Vol 9 (1) ◽  
pp. 47
Author(s):  
Elis Seftia Arum ◽  
Nova Hariani ◽  
Medi Hendra
Keyword(s):  
Community Structure ◽  
Normal Level ◽  
Power Flow ◽  
Sampling Method ◽  
Diversity Index ◽  
Plankton Sample ◽  
Chemical Parameters ◽  
Dominance Index ◽  
Physico Chemical ◽  
Evenness Index

This study aims to determine (physico-chemical) parameters of water and also community structure of plankton surface in natural tourism Labuan Cermin Biduk-Biduk, Berau, Kalimantan Timur. This study used Purposive Sampling method. Data obtained shows in plankton abundance, diversity index, evenness index and dominance index. The result of study showed that range of temperature between 24,04 oC -26,88 oC, range of salinity between 0.25-0.87o/oowhich classified in freshwater-brackish water, range of power flow between 1.121-2.930 m/s which classified in moderate level, the average pH between 6,76-7,48 which classified in neutral level, range of TDS between  514-788 mg/L which classified in normal level, respectively. Plankton sample showed 27 classes including of 22 classes of phytoplankton with 57 genera and 5 classes of zooplankton with 10 genera. The highest total plankton abundances of  35917 ind/L is in Station A and the lowest total plankton abundances of 8330 ind/L is in Station F. Keywords: Plankton, Labuan Cermin,  Diversity.

scholarly journals STRUKTUR KOMUNITAS MAKROALGA DI PANTAI GEGER DAN PANTAI MENGENING KABUPATEN BADUNG

2021 ◽  
Vol 9 (1) ◽  
pp. 51
Author(s):  
Ni Putu Sintha Maharani ◽  
Ni Luh Watiniasih ◽  
Ayu Putu Wiweka Krisna Dewi
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Diversity Index ◽  
Habitat Characteristics ◽  
Dominance Index ◽  
Sandy Substrate ◽  
Stable Conditions ◽  
Evenness Index ◽  
Coral Rock ◽  
Stems And Leaves

Macroalgae is a type of flora known as seaweed and is classified into low-level plants, where roots, stems, and leaves are relatively difficult to distinguish. This study aims to determine the differences of habitat characteristics, number of species, biomass, and macroalgae community structure in Geger Beach and Mengening Beach. This quadrant transect method was used to collect the data. The results show that Geger Beach has sandy substrate, while Mengening Beach has substrate consisting of coral rock. The water quality in both locations are still suitable for macroalgae growth. The results of the study found 8 types of macroalgae in Geger Beach and 10 types of macroalgae in Mengening Beach. The highest macroalgae biomass at Geger Beach was found in Gracilaria hayi with the weight ranging from 72.08-73.18 g/m2, while at Mengening Beach was found in the Valonia aegagropila, ranging from 181.31-190.40 g/m2. The diversity index of macroalgae in Geger Beach was between 1.93-1.99, while at Mengening Beach was between 1.79-2.07, therefore categorized as medium. The dominance index of macroalgae at Geger Beach was between 0.15-0.17, while at Mengening Beach was between 0.17-0.25, therefore the dominance index at both site was categorized low. The evenness index at Geger Beach was between 0.93-0.96, while at Mengening Beach was between 0.78-0.90, which categorized as stable conditions.

scholarly journals COMPOSITION AND COMMUNITY STRUCTURE OF COPEPOD IN KAKAP RIVER ESTUARY, KUBU RAYA DISTRICT WEST BORNEO

2021 ◽  
Vol 3 (1) ◽  
pp. 54-66
Author(s):  
Elda Sari ◽  
Nora Idiawati ◽  
Sukal Minsas
Keyword(s):  
Community Structure ◽  
Correlation Analysis ◽  
Sampling Method ◽  
Diversity Index ◽  
River Estuary ◽  
Dominance Index ◽  
Purposive Sampling ◽  
Density Correlation ◽  
Evenness Index ◽  
Current Parameter

The research of composition and community structure of copepods in Kakap river estuary, Kubu Raya District, West Borneo was conducted from October to December 2020. The purpose of this study is to determine the composition and the community structure of copepod in Kakap river estuary, Kubu Raya District, West Borneo. This study used a purposive sampling method at four stations. Copepod samples were taken using plankton net. During the research, the total number of copepods that have been identified from 4 stations are 11 species from 3 orders, 4 families and 8 genera. Copepoda that has been obtained has the composition, namly Cyclopoids 5 species, Harpacticoida 3 species, Calanoida 2 species. The copepod density in Kakap river estuary ranged from 7,9-103,3 Ind / l, the diversity index (H ') ranged from 0 to 1.9, the evenness index (E) ranged from 0 - 0,9 and the dominance index (C) ranged from 0,2 - 1. The result of copepod density correlation analysis is that negatively correlated with -1,000 current parameter and positively correlated with the DO parameter, which is 0,800. The research of composition and community structure of copepods in Kakap river estuary, Kubu Raya District, West Borneo was conducted from October to December 2020. The purpose of this study is to determine the composition and the community structure of copepod in Kakap river estuary, Kubu Raya District, West Borneo. This study used a purposive sampling method at four stations. Copepod samples were taken using plankton net. During the research, the total number of copepods that have been identified from 4 stations are 11 species from 3 orders, 4 families and 8 genera. Copepoda that has been obtained has the composition, namly Cyclopoids 5 species, Harpacticoida 3 species, Calanoida 2 species. The copepod density in Kakap river estuary ranged from 7,9-103,3 Ind / l, the diversity index (H ') ranged from 0 to 1.9, the evenness index (E) ranged from 0 - 0,9 and the dominance index (C) ranged from 0,2 - 1. The result of copepod density correlation analysis is that negatively correlated with -1,000 current parameter and positively correlated with the DO parameter, which is 0,800.

scholarly journals Community Structure of Gastropod in Seagrass Beds of Waleo Beach Waters, North Minahasa Regency

2020 ◽  
Vol 8 (1) ◽  
pp. 102
Author(s):  
Richardo O. Roring ◽  
Jety K. Rangan ◽  
Alex D. Kambey ◽  
Rene Ch. Kepel ◽  
Stephanus V. Mandagi ◽  
...  
Keyword(s):  
Community Structure ◽  
Water Temperature ◽  
Relative Density ◽  
Diversity Index ◽  
The Other ◽  
Seagrass Beds ◽  
Dominance Index ◽  
Good For ◽  
Specific Species ◽  
Growth Ph

This study aims to determine the type of Gastropod and the community structure including Species Density, Relative Density, Diversity (H’), and Dominance (C). Based on observation, there is 124 individuals included in 11 species (7 genera) from 7 families (3 orders) obtained. The highest density value is 5,87 Ind/m2 by Euplica borealis, and has 35,48% of relative density. For the diversity, an index is H’ = 1,62 obtained, which is classified as low. This shows that seagrass beds in Waleo beach waters, North Minahasa Regency, there are several species obtained with abundant numbers of individuals compared to the other species, so the diversity index obtained relatively low. As for the range of dominance index is C = 0,36 to 0,44. The lowest value is in the transect number 1 while the highest in the transect number 2. This value shows that seagrass beds in Waleo beach waters, North Minahasa Regency there are no specific species that dominate in the community. Waleo beach waters, North Minahasa Regency has a temperature of about 29,3 °C illustrating the condition of the water temperature is relatively good for Gastropods' life. The salinity is 30 ‰ obtained, which is relatively good for Gastropod growth. pH obtained about 7 which is still relatively good for gastropods life.Keywords: Gastropod, Community Structure, Waleo.AbstrakPenelitian ini bertujuan untuk menginventarisasi jenis-jenis Gastropoda serta mengetahui struktur komunitas termasuk: Kepadatan Spesies, Kepadatan Relatif, Keanekaragaman (H’), dan Dominansi (C). Berdasarkan hasil pengamatan diperoleh 124 individu yang termasuk dalam 11 spesies (7 genera) dari 7 famili (3 ordo). Nilai kepadatan tertinggi sebesar 5,87 Ind/m2 oleh spesies Euplica borealis, dan memiliki kepadatan relatif sebesar 35,48 %. Untuk indeks keanekaragaman diperoleh sebesar H’ = 1,62 yang tergolong rendah. Hal ini menunjukan bahwa daerah padang lamun perairan pantai Waleo, Kabupaten Minahasa Utara terdapat beberapa spesies yang diperoleh dengan jumlah individu yang melimpah dibandingkan jenis lainnya, sehingga indeks keanekaragaman yang diperoleh tergolong relatif rendah. Adapun untuk kisaran indeks dominansi yang diperoleh yaitu sebesar C = 0,36 sampai dengan 0,44. Nilai terrendah terdapat pada transek 1 sedangkan nilai tertinggi terdapat pada transek 2. Nilai tersebut menunjukan bahwa di padang lamun perairan Pantai Waleo, Kabupaten Minahasa Utara tidak terdapat jenis atau spesies tertentu yang mendominasi dalam komunitas tersebut. Wilayah perairan pantai Waleo, Kabupaten Minahasa Utara memiliki suhu 29,3 °C, menggambarkan bahwa kondisi suhu perairan tergolong baik untuk kehidupan Gastropoda. Salintas yang diperoleh sebesar 30 0/00, yang masih dalam kisaran baik untuk pertumbuhan Gastropoda. Derajat keasaman (pH) yang diperoleh yaitu 7 yang masih tergolong baik untuk kehidupan Gastropoda.Kata Kunci : Gastropoda, Struktur Komunitas, Waleo.

scholarly journals Characteristics of Benthos communities in Laoting area of Hebei Province

2020 ◽  
Vol 206 ◽  
pp. 02024
Author(s):  
Li Guanglou ◽  
Cao Hongmei ◽  
Ye wei
Keyword(s):  
Community Structure ◽  
Benthic Community ◽  
Dominant Species ◽  
Diversity Index ◽  
Hebei Province ◽  
Benthic Community Structure ◽  
Number Of Species ◽  
Evenness Index ◽  
Sea Area ◽  
Richness Index

According to a survey of benthos in the Laoting sea area of Hebei Province on May 24th 2019, a total of 40 benthos species were obtained, of which mollusks have the largest number, followed by annelids and arthropods. The dominant species are Sternaspis sculata and Ringicula doliaris. The number of species obtained in this survey is much lower than the historical average. The diversity index is significantly lower than that in the April 2008 survey, and the evenness index and richness index have declined slightly, indicating that the benthic community structure in this sea area tends to be simplistic, stability tends to deteriorate.

scholarly journals The Effect of Pre Order Online Sales to Company Profits on PT. Aventama Hervent Solusindo Bandung

2020 ◽  
Vol 1 (3) ◽  
pp. 88-92
Author(s):  
Tiris Sudrartono
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Linear Regression Analysis ◽  
Electronic Devices ◽  
Production Costs ◽  
The Other ◽  
The Internet ◽  
Simple Linear Regression ◽  
Online Sales ◽  
Internet Network

This research aims to find out how online pre order sales and profit earning on PT Aventama, also how big is the effect of pre order online sales towards the profit on PT Aventama, and to get to know about what are the efforts that could be able to do for increase the company profits through online pre order sales. Theory that supports in this research was revealed by Oki Pamungkas, 2018 who said that online sales is  conducting sales activities from looking for potential buyers to offering products or goods by utilizing the internet network that is supported by a set of electronic devices as a link to the internet network, while Toto Prihadi 2012 said that profit is a measure of company's performance obtained from the results of reduction results of sales minus production costs. From conducted research, it can be obtained of the results of online pre order sales and company profits on PT Aventama, it's obtained results of 77.2% for online pre order sales and 35.7% for the profits and are categorized well. Then the correlation test is used for find out about the effect of online pre order sales with the results obtained at 84%, this value can be interpreted that the effect of online pre order sales to profits is very strong, while the other 16% is effected by other factors that it’s not examined by the author. Based on a simple linear regression analysis obtained Y '= 3.307 + 0.420X it means every online pre order sale is improved, it will be followed by an improve in company profit of 0.420 at a constant 3.037. With this research, it's expected that there will be a change in the company's profit through increasing online pre-order sales by creating advertisements, providing more complete ready stock products, and adding new suppliers so that the ordering process of products is faster to consumers

scholarly journals COMMUNITY STRUCTURE ECHINODERMS (ASTEROIDEA, OPHIUROIDEA, ECHINOIDEA AND HOLOTHUROIDEA) IN THE MARINE NATIONAL PARK EAST SULAWESI WAKATOBI

2016 ◽  
Vol 8 (1) ◽  
pp. 357-366 ◽  
Author(s):  
Eddy Yusron
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
National Parks ◽  
National Park ◽  
Diversity Index ◽  
Dead Coral ◽  
Evenness Index ◽  
Different Types ◽  
High Level ◽  
Richness Index

A study on Echinoderms community structure in marine national parks of Wakatobi, Southeast Sulawesi was conducted in six locations, i.e., Waha Beach, Coastal Sombo, Beach Houses, Beach Kapota, Banakawa beach, and Umala beach in October 2013. All of the six parks were located the Wakatobi territorial waters with coordinates of 5°06'25" S and 123°124'10 E. The results showed of 18 species of echinoderms representing six different types of Asteroidea, two types of Ophiuroidea, six types of Echinoidea, and four types of Holothuroidea. Group of starfish or Asteroidea was the most prominent on seagrass area. Based on the six transects sites, it turned out that the group of starfish (Asteridea) occupied a relatively high level of species richness. From the quantitative analysis values, we obtained diversity index (H) of 1.105 in Sombu, the highest evenness index (J) of 0.989 was found in Umala, and the highest species richness index values (D) of 0.132 was obtained in kapota. It seemed that all echinoderm groups were generally like seagrass microhabitat (12 types). While, sand and dead coral habitats were only occupied by 8 (eight) echinoderm groups. Keywords: echinoderms, diversity, Wakatobi, Southeast Sulawesi

scholarly journals Evaluating Human Movement Coordination During Immersive Walking in a Virtual Crowd

2020 ◽  
Vol 10 (9) ◽  
pp. 130 ◽  
Author(s):  
Alexandros Koilias ◽  
Michael Nelson ◽  
Sahana Gubbi ◽  
Christos Mousas ◽  
Christos-Nikolaos Anagnostopoulos
Keyword(s):  
Linear Regression ◽  
Virtual Environment ◽  
Human Movement ◽  
Movement Behavior ◽  
Regression Analyses ◽  
Simple Linear Regression ◽  
Movement Coordination ◽  
The Road ◽  
Metropolitan City

This paper describes our investigation on how participants coordinate movement behavior in relation to a virtual crowd that surrounds them while immersed in a virtual environment. The participants were immersed in a virtual metropolitan city and were instructed to cross the road and reach the opposite sidewalk. The participants performed the task ten times. The virtual crowd that surrounded them was scripted to move in the same direction. During the experiment, several measurements were obtained to evaluate human movement coordination. Moreover, the time and direction in which the participants started moving toward the opposite sidewalk were also captured. These data were later used to initialize the parameters of simulated characters that were scripted to become part of the virtual crowd. Measurements were extracted from the simulated characters and used as a baseline to evaluate the movement coordination of the participants. By analyzing the data, significant differences between the movement behaviors of the participants and the simulated characters were found. However, simple linear regression analyses indicated that the movement behavior of participants was moderately associated with the simulated characters’ movements when performing a locomotive task within a virtual crowd population. This study can be considered as a baseline for further research that evaluates the movement coordination of participants during human–virtual-crowd interactions using measurements obtained by the simulated characters.

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