scholarly journals Diversity of termites (Isoptera) on industrial forest plantation of Eucalyptus pellita stands of tropical ecosystem in Riau, Indonesia

2020 ◽  
Vol 21 (11) ◽  
Author(s):  
SRI RAHAYU PRASTYANINGSIH ◽  
Suryo Hardiwinoto ◽  
MUSYAFA MUSYAFA ◽  
CAHYONO AGUS DWI KORANTO
Keyword(s):  
Sampling Method ◽  
Diversity Index ◽  
Stand Age ◽  
Forest Plantation ◽  
Tropical Ecosystem ◽  
Eucalyptus Pellita ◽  
Transect Sampling ◽  
Industrial Forest ◽  
Negative Effect ◽  
Sørensen Index

Abstract. Prastyaningsih SR, Hardiwinoto S, Musyafa, Koranto CAD. 2020. Diversity of termites (Isoptera) on industrial forest plantation of Eucalyptus pellita stands of tropical ecosystem in Riau, Indonesia. Biodiversitas 21: 5498-5505. Eucalyptus pellita is an alternative tree species for pulp and paper of industrial forest plantation. One of the forest plantation’s negative effect is the loss of biodiversity and vulnerable to pest and disease. Termites are one of the pests attacking the forest plantations and play an important role in the ecological process. Need a better understanding of the termite role ecosystem process in E. pellita stands. This research aimed to determine the diversity of termite species found in E. pellita stands at different rotation and ages of stands. Termite diversity sampled by the transect sampling method in the 4th and 5th rotation with four-level ages (1, 2, 3, 4-years-old). The transect area was divided into 24 plots (100 m x 2 m). The termites in the Eucalyptus stand consist of two families (Termitidae and Rhinotermitidae), five subfamilies (Termitinae, Macrotermitinae, Nasutitermitinae, Rhinotermitinae, and Coptotermitinae), and eight species (Discupiditermes nemorosus, Macrotermes gilvus, Termes rostatus, Amitermes dentatus, Microcerotermes sp., Nasutitermes matangensis, Schedorhinotermes medioobscurus, and Coptotermes havilandi). The diversity index (H) in the 4th rotation was 1.95, while in the 5th rotation was 1.63, with a similarity in the Sorensen Index of 87.71%. The existence of termites is dominated by the wood feeder group. The species richness of the termites at the two rotations increased with the increase of the stand age.. The relative abundance composition of termites in the 5th rotation, is higher than the 4th rotation. Termite occurrence was influenced by necromass, tree biomass, humidity, and temperature.

scholarly journals IDENTIFIKASI GASTROPODA DI SUB DAS ANAK SUNGAI GANDONG DESA KERIK TAKERAN

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
Mustika Wahyuning Tyas ◽  
Joko Widiyanto
Keyword(s):  
Qualitative Research ◽  
Observational Study ◽  
Site Selection ◽  
Research Method ◽  
Sampling Method ◽  
Diversity Index ◽  
Environmental Parameters ◽  
Research Station ◽  
Dominance Index ◽  
Transect Sampling

The aim of research to determine the diversity and Gastropod that predominate in sub watershed tributary village Gandong Takeran Kerik. Descriptive qualitative research method with type of observational study. Determination and site selection studies using transect sampling method, the size of 1x1 m transect quadrant. Research station at 3 stations with 3 points each station. The data was analyzed after identifying the calculation dominance index and diversity index. Gastropod identification results found 4 genera Thiara, Melanoides, Brotia, and Clea. The highest abundance of gastropods at station II, namely 13.7 ind/m2. Thiara highest dominance index is 0.654, indicating that Thiara mendominansi in sub watershed tributary village Gandong Takeran Kerik. Diversity index of each station 0.617, 0.765, and 0.615, indicating that the diversity of gastropods in sub watershed tributary village Gandong Takeran Kerik is very low. Environmental parameters air temperature 30C - 31C, 28C - 29C water temperature, pH 7 to 7.3, and dissolved oxygen (DO) 5mg /l - 5,4mg /l.

scholarly journals Diversity of Bivalvia, Gastropoda and Holothuroidea in Intertidal Zone of North Javan Sea Coastal, Indonesia

2021 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
V. Rohmayani ◽  
E. Tunjung Sari M. ◽  
Nurhidayatullah Romadhon ◽  
H. Ichda Wahyuni
Keyword(s):  
Intertidal Zone ◽  
Sampling Method ◽  
Diversity Index ◽  
Total Sample ◽  
Target Species ◽  
Transect Sampling ◽  
Density Index ◽  
Zone Ii ◽  
Important Value Index

This study aims to know diversity of Bivalvia, Gastropoda and Holothuroidea. Measures used in this study were Density Index (D), Diversity Index (H’), Evennes Index (E’) dan Important Value Index (INP). This study used transect sampling method by 1 × 1 meter quadrant. Target species of this study were member of Bivalvia, Gastropoda and Holothuroidea that inhabit in intertidal zone of north Javan Sea coastal. This intertidal zone was divided into 3 zone; zone I is 50 meter, zone II is 75 meter and zone III is 100 meter from coastal line to sea. Total sample of this species were 1064 individual, that divided into 7 species of Bivalvia, 10 species of Gastropoda and 2 spesies of Holothuridea. The highest Diversity Index was for Gastropoda in zone I (253 individual/m2). Diversity Index was in moderate category (1< H’ < 2) while the zone III was the highest. Evennes Index of all zones were relatively similar. The highest Important Value Index was species of Clypeomorus clypeomorus, that has value 53,06%.

Linking fish and crustacean taxonomic composition with seasonal contrasts in the soft-bottom intertidal zone

2020 ◽  
Author(s):  
M. A. Gondal ◽  
S. Iqbal ◽  
U. Atique ◽  
N. U. Saher ◽  
N. A. Qureshi ◽  
...  
Keyword(s):  
Species Richness ◽  
Water Temperature ◽  
Fish Species ◽  
Diversity Index ◽  
Taxonomic Composition ◽  
Primary Objective ◽  
Negative Effect ◽  
Fish Species Composition ◽  
One Year ◽  
Sw Monsoon

Abstract The primary objective of this study was to investigate the seasonal fish and crustacean variations concerning taxonomic composition, species richness, and diversity in sandy beach habitat. For this purpose, we investigated the Sonmiani Hor lagoon area during four distinct seasons, i.e., northeast (NE) monsoon, pre-monsoon, south-west (SW) monsoon, and post-monsoon for one year. During each haul, the net was pulled about 100m along the beach in 0.5m depth. The results showed a strong linear correlation between the diversity index and equitability in fishes (r = 0.978). The diversity index was strong negatively correlated with the abundance and biomass (r = -0.978, -0.972, respectively). The physical attributes like sea surface water temperature and salinity showed a strong negative effect on species assemblages (r = -0.981 and -0.943, respectively). The mean air and water temperature illustrated approximately 3°C difference during NE and pre-monsoon seasons. However, salinity, pH, and electrical conductivity did not show any significant seasonal variabilities. Under the ecological indices, the fish species displayed higher diversity (H’ = 3.19) during SW monsoon, whereas the lowest diversity was observed during pre-monsoon (H’ = 1.58). The equitability and species richness, however, remained more noticeable during SW monsoon (J’ = 0.81). The total number of individuals of fish and crustaceans reached 4799 with 3813 fish individuals and 986 individuals of crustaceans. A total of 27 families of fish while five crustacean families comprising of 30 genera and 38 fish species while ten genera and 17 species of crustaceans were recorded. Liza subviridis displayed the highest abundance among the sampled fish species. In conclusion, fish species constituted a significant part of the coastal fauna in the study area. The seasonal variations displayed distinct variations in fish species composition and diversity.

The effect of teaching style and academic enthusiasm of accounting and auditing students on stress, aggression, and anxiety

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Arash Arianpoor ◽  
Hameed Mohsen Khayoon
Keyword(s):  
Structural Equation ◽  
Design Methodology ◽  
Sampling Method ◽  
Structural Model ◽  
Teaching Style ◽  
Equation Modeling ◽  
Statistical Population ◽  
Content Type ◽  
Confirmatory Factor ◽  
Negative Effect

Purpose This study aims to investigate the effect of teaching style and academic enthusiasm of Iraqi accounting and auditing students on their stress, aggression and anxiety. Design/methodology/approach The statistical population in this study consists of two parts. The first is the Iraqi accounting and auditing students in Iran and the second is the Iraqi accounting and auditing students in Iraq. By available non-probability sampling method, 62 people (Iraqi students in Iran) and 102 (Iraqi students in Iraq) were selected as samples. In this research, a questionnaire was used to collect information. The validity of the questionnaire’s structure was confirmed by confirmatory factor analysis. Also, Cronbach’s alpha coefficients in this study indicating the measurement tool’s reliability. In this research, structural equation modeling has been used to analyze and test the hypotheses. The primary criteria for determining the coefficient and evaluating the path coefficients were used to evaluate the structural model. Findings Findings indicate that in Iraqi students in Iraq and Iraqi students in Iran, teaching style negatively affects stress, aggression and accounting and auditing students’ anxiety. Also, in the group of Iraqi students in Iraq and the group of Iraqi students in Iran, the eagerness to study has a significant negative effect on accounting and auditing students’ stress and anxiety. In contrast, the effect of the desire to study accounting and auditing students’ aggression was confirmed only in Iraqi students in Iraq. Originality/value As the accounting and auditing professions are among the most stressful occupations that increase the characteristics of aggression and anxiety in the employees of that profession, the results of leading research can show that the stress, anxiety and aggression of accounting and auditing students how to reduce through training so that their stress, anxiety and aggression do not appear in the workplace and the reports of accountants and auditors are not affected.

scholarly journals Examining the Mediation of Job Satisfaction in the Relationship between Work Stress and Turnover Intention in Textile Company

2020 ◽  
Vol 5 (2) ◽  
pp. 113-121
Author(s):  
Romat Saragih ◽  
Arif Partono Prasetio ◽  
Bachruddin Saleh Luturlean
Keyword(s):  
Job Satisfaction ◽  
Work Stress ◽  
Turnover Intention ◽  
Sampling Method ◽  
Sampling Technique ◽  
Jel Classification ◽  
Positive Direction ◽  
Negative Effect ◽  
The Relationship

Objective – This study investigates the mediation role of job satisfaction in the relationship between work stress and turnover intention. A study about turnover intention in the textile company is still rarely done in Indonesia. This study can fill the gap regarding the topic. Methodology/Technique – A nonprobability sampling method with an accidental sampling technique was used, and we get 110 usable responses from a textile company in West Java, Indonesia. Macro Process with SPSS was used to measure the regression and the mediation. Findings – The study found that work stress has a negative effect on job satisfaction. Work stress significantly related to turnover intention in a positive direction. Job satisfaction did not have a significant relation with turnover intention. Thus, in this study, we found no mediation role in job satisfaction. Novelty – Evidently, work stress solely took part in shaping the turnover intention. Type of Paper: Empirical. Keywords: Work stress, Job satisfaction, Turnover intention, Textile Company, Mediation Reference to this paper should be made as follows: Saragih, R; Prasetio, A.P; Luturlean, B.S. 2020. Examining the Mediation of Job Satisfaction in the Relationship between Work Stress and Turnover Intention in Textile Company, J. Mgt. Mkt. Review 5(2) 113 – 121. https://doi.org/10.35609/jmmr.2020.5.2(4) JEL Classification: J28, J29, M19.

scholarly journals The Effect of Profitability, Leverage, Liquidity, Size, and Company Growth on the Dividend Payout Ratio in the Indonesian Capital Market 2013-2018

2021 ◽  
Vol 4 (1) ◽  
pp. 1351-1360
Author(s):  
Anjumul Azhariyah ◽  
Andre Dwijanto Witjaksono ◽  
Ulil Hartono
Keyword(s):  
Regression Analysis ◽  
Capital Market ◽  
Sampling Method ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Company Size ◽  
Dividend Payout ◽  
Testing Method ◽  
Negative Effect ◽  
Company Growth

This study aims to determine and analyze the effect of Profitability, Leverage, Liquidity, Size, and Company Growth on Dividend Payout Ratio in the Indonesian capital market 2013-2018. The population of this research is 525 companies from all sectors listed on the IDX except for the finance sector. By using purposive sampling method, the number obtained is 10 companies. The data testing method used is multiple linear regression analysis. The results showed that simultaneously the variables of profitability, leverage, liquidity, size and company growth had no effect on the dividend payout ratio. Partially, profitability, leverage, liquidity, company size have no effect on the dividend payout ratio, while the company growth variable has a significant negative effect on the dividend payout ratio.

scholarly journals Struktur Komunitas Fitoplankton di Kolam Bekas Pertambangan Batubara Desa Kampung Baru Kecamatan Cempaka

BIOSCIENTIAE ◽  
2021 ◽  
Vol 17 (2) ◽  
pp. 37
Author(s):  
Sukoco Sukoco ◽  
Gunawan Gunawan ◽  
Muhamat Muhamat
Keyword(s):  
Community Structure ◽  
Coal Mining ◽  
Sampling Method ◽  
Diversity Index ◽  
Pool Analysis ◽  
Fertility Rate ◽  
The State ◽  
Purposive Sampling ◽  
Phytoplankton Communities ◽  
Average Abundance

This study aims to determine the structure of phytoplankton communities in the pool are former coal mining Desa Kampung Baru Kecamatan Cempaka which include abundance, diversity, uniformity and dominance. Phytoplankton samples taken in two pools with a purposive sampling method with a three-point shooting at each pond. Sampling was performed three times. Phylum of phytoplankton were identified in both pools as much as 2 phylum (Chloropyta and Chrysopita) with 17 genera. Average abundance of phytoplankton in the first pool of 7174 ind / liter and 6873 ind / liter in the second pool. The average diversity index of phytoplankton in the first pool of 1.540 and 1.621 in the second pool. Average uniformity index of phytoplankton in the first pool of 0622 and 0.623 in the second pool. The average index of phytoplankton dominance in the first pool of 0271 and 0250 in the second pool. Analysis of community structure (abundance, diversity, uniformity and dominance) shows the condition of the two ponds in the state is quite stable and capable of supporting life inside the phytoplankton. Where the pool in the fertility rate is the level of contamination is, the conditions included in the category of individuals spread more evenly and there are no species that dominate other species in the extreme.

scholarly journals Community Structure of Gastrpods in Mokupa Beach, Sub-district of Tobariri,Minahasa Regency, North Sulawesi Province

2015 ◽  
Vol 3 (1) ◽  
pp. 22
Author(s):  
Alinaung F. Firgonitha ◽  
Anneke V. Lohoo ◽  
Alex D. Kambey
Keyword(s):  
Diversity Index ◽  
High Tide ◽  
Ocean Basin ◽  
Food Chains ◽  
Seagrass Bed ◽  
Species Diversity Index ◽  
Tropical Ecosystem ◽  
Filter Feeder ◽  
Edge Cover ◽  
North Sulawesi

Ecologically intertidal mollusk has important role in the food chains. As a filter feeder, mollusk is also known as a food source for other marine organisms. The intertidal zone is known as the smallest area in the ocean basin (Nybakken, 1992). This zone is a narrow edge cover only few square meters and position between low tide mark (LTM) and high tide mark (HTM). The study was conducted in Mokupa beach waters, Tombariri sub-district, Minahasa Regency. Coastal area of Mokupa village represent typical tropical ecosystem such as coral reef, seagrass bed and mangrove belt. As many as 45 species in 134 total individuals were recorded during the study. The density of gastropods collected is 4.4667 individual/m2 while density for gastropods species Littoraria scabra Linne was 0.4000 individual/m2 and in term of relative density is 9.834 % and thus considered the highest. Species diversity index of this species is H’ = 2.37594. Keywords: mollusk, diversity, dominance   A B S T R A K   Secara ekologis Moluska yang menempati daerah intertidal memiliki peranan yang besar kaitannya dengan rantai makanan. Karena di samping sebagai filter feeder, moluska juga merupakan makanan bagi biota lainnya. Zona intertidal (pasang-surut) merupakan daerah terkecil dari semua daerah yang terdapat di samudera dunia (Nybakken, 1992). Zona ini merupakan pinggiran yang sempit sekali, hanya beberapa meter luasnya, terletak di antara air pasang tinggi dan air surut rendah. Penelitian ini dilaksanakan di perairan pantai Mokupa Kecamatan Tombariri Kabupaten Minahasa. Daerah pantai Desa Mokupa merupakan daerah yang lokasinya terdapat ekosistem yang khas di daerah tropis yaitu terumbu karang, padang lamun, dan hutan mangrove. Diperoleh sebanyak 45 spesies dan berjumlah 134 individu. Kepadatan rata-rata organisme Gastropoda diperoleh 4,4667 indv/m2 , dengan  kepadatan spesies tertinggi 0,4000 indv/m2 (Littoraria scabra Linne), dengan Kepadatan relative  adalah 9,834 %.Keanekaragaman spesies diperoleh nilai (H’= 2.37594)   Kata Kunci : Komunitas, keanekaragaman, dominasi 1Mahasiswa Program Studi MSP FPIK-UNSRAT 2Staf pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi

scholarly journals Factors Affecting the Earning Response Coefficient with Real Activities Earning Management as Moderator: Evidence from Indonesia Stock Exchange

2019 ◽  
pp. 1-14 ◽  
Author(s):  
Aminullah Assagaf ◽  
Etty Murwaningsari ◽  
Juniati Gunawan ◽  
Sekar Mayangsari
Keyword(s):  
Stock Return ◽  
Sampling Method ◽  
Capital Expenditure ◽  
Stock Exchange ◽  
Financial Statements ◽  
Short Term ◽  
Factors Affecting ◽  
Earnings Per Share ◽  
Negative Effect ◽  
Positive Effect

This study aims to explain the phenomenon of the most active companies traded shares in Indonesian stock exchange. This research is motivated to analyze the response of investors to take a decision after presenting the company's financial statements. This study uses panel data consisting of 20 companies selected by purposive sampling method, using a regression model and data processing via SPSS 24. The results of this study found that the variable leverage and capital expenditure variables significantly influence the response of investors to execute the company's stock, thereby affecting the stock return. The level of leverage and significant positive effect on the response of investors, particularly due to the use of debt to investment would increase earnings per share or at a certain amount of equity can boost earnings per share acquisition. Capital expenditure and significant negative effect on the response of investors for investor tend to speculate on short-term period, which means that companies that invest in the early stages will have difficulties liquidity and rate of return will decline, so investors will shift their investment.

scholarly journals The Effect of Corporate Social Responsibility, Profitability, and Leverage toward Tax Aggressiveness with Size of Company as Moderating Variable

2018 ◽  
Vol 9 (1) ◽  
pp. 63
Author(s):  
Riza Aulia Fitri ◽  
Agus Munandar
Keyword(s):  
Corporate Social Responsibility ◽  
Social Responsibility ◽  
Sampling Method ◽  
Stock Exchange ◽  
Corporate Tax ◽  
Tax Aggressiveness ◽  
Analysis Technique ◽  
Negative Effect ◽  
Corporate Social

This research aimed to examine the influence of Corporate Social Responsibility (CSR), profitability, and leverage toward tax aggressiveness by considering the size of the company as the moderating variable. The population was 111 companies listed on the Indonesian Stock Exchange (BEI) from 2010 to 2015. Determination of the sample used purposive sampling method, and it obtained a sample of 36 manufacturing based on certain criteria. The analysis technique used was the multiple regression analysis. The results show that CSR and leverage have a significant and negative effect influence on the tax aggressiveness of the corporate tax. Meanwhile, profitability does not significantly influence the tax aggressiveness in corporate taxes, and the size of company cannot moderate the influence of CSR, the profitability, and leverage on tax aggressiveness.

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