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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Torani Journal of Fisheries and Marine Science Jurnal Kelautan Tropis International Journal of Social Science and Business International Journal of Remote Sensing and Earth Sciences (IJReSES) The International Journal of Tropical Veterinary and Biomedical Research
Rastina, Rastina
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Economics, Econometrics & Finance Environmental Science Immunology & microbiology Medicine & Pharmacology Public Health Social Sciences Veterinary

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HYDRODYNAMICS MODELING IN KENDARI BAY, SOUTHEAST SULAWESI, INDONESIA Imalpen, Imalpen; Prartono, Tri; Rastina, Rastina; Koropitan, Alan Frendy; Yuliardi, Amir Yarkhasy
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 21, No 1 (2024)
Publisher : Ikatan Geografi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.ijreses.2024.v21.a3906

Abstract

Kendari Bay is coastal water in the center of the capital city of Southeast Sulawesi province. It is shaped like a pocket with a narrow mouth and there is an estuary of a large river, namely the Wanggu river, which makes the dynamics of its waters very interesting to study. The focus of the study is the hydrodynamic factors in the Kendari Bay and Wanggu River areas. This study aims to examine the hydrodynamic conditions of Kendari Bay, mainly due to the existence of reclamation and the influence of the Wanggu River which has not been studied previously. This research method uses a two-dimensional model based on bathymetric data, tides, and the flow of the Wanggu River with a simulation time of 15 days (1 March to 15 March 2020). The modeling results were then verified with PUSHIDROSAL tidal elevation data showing an RMSE value of 0.07 indicating that the model was well constructed. The mixed tidal type with a tendency to double daily is the tidal type of Kendari Bay waters based on the Formzahl number value of 0.51. The current pattern generally moves in and out from east to west and vice versa with a varying elevation range following spring conditions of 1.75 m. The maximum tidal speed is 0.1784 m/s and the minimum value is 0.0057 m/s which is shown in the sample results of the model when the hing to low tide, and low to high tide. The results of the hydrodynamic modeling show that the current velocity increases when passing through a narrow path, namely the bay estuary and river estuary. The existence of the reclamation area affects the changes in the velocity of the current which is significantly larger and the direction of the current that undergoes a deflection follows the shape of the reclamation area. The current direction is to the southeast and then turns towards the northeast when low to high tide and eastward then turns towards the northeast when the high to low tide spring conditions compared to research before the reclamation
Bioaccumulation of Lead (Pb) on The Dog Conch (Strombus canarium) in Madong Waters, Tanjung Pinang Tirtama, Wahyu; Bengen, Dietriech Geoffrey; Rastina, Rastina
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22358

Abstract

The waters of Madong in Tanjung Pinang city are located in a strategic area that has a significant impact on the livelihoods of fishermen, post-bauxite mining areas, ship traffic, and population activities. These factors have contributed to the contamination of heavy metal Pb in the waters, sediments, and dog conch. The purpose of this study is to analyze the levels of heavy metal Pb in the waters, sediment, and dog conch, and to assess the bioaccumulation factors of heavy metal Pb in dog conch in Madong waters. Samples of waters, sediment, and dog conch were collected from three stations and analyzed using AAS at the Marine Chemistry Laboratory of Raja Ali Haji Maritime University. The concentration of Pb in the waters ranged from 0.0204 mg/L to 0.0636 mg/L, while the concentration of Pb in sediment ranged from 0.5947 mg/Kg to 0.9402 mg/Kg. The Pb metal concentration in juvenile dog conch ranged from 0.0745 mg/Kg to 0.3437 mg/Kg. The highest BAF and BSAF values for Pb metal in adult dog conch were observed at station 1, with values of 27.241 and 0.6991, respectively. The categorization of Pb metal in Strombus canarium dog conch as low is based on the BAF and BSAF value categories.
The Correlation Between pH Values and Acidity Degrees of Dadih from Gayo to Total Bacteria Colonies with Different Storage Time and Temperature Rastina, Rastina; Ferasyi, Teuku Reza; Azhari, Azhari; Rasmaidar, Rasmaidar; Hasan, Denny Irmawati; Helmi, T Zahrial; Sitepu, Dinda Meilinda Br
The International Journal of Tropical Veterinary and Biomedical Research Vol 9, No 2 (2024): Vol. 9 (2) November 2024
Publisher : The Faculty of Veterinary Medicine of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21157/ijtvbr.v9i2.43677

Abstract

Dadih is a traditional food product that is produced by storing buffalo milk in bamboo tubes and left for 2-3 days. During the process of making Dadih, milk ferments into Dadih in a bamboo tube. The aim of this research is to determine the quality of buffalo Dadih from pH values, acidity degrees, and total bacterial colonies with different storage durations and temperatures. This research used 12 bamboo tubes with two treatments and three repetitions. This research used a laboratory experimental method with a 2x3 factorial pattern. This research showed that the highest room and refrigerator pH values were found in the first week, with an average of 7.13 0.15 and 7.9 0.1. The highest acidity degree values from room temperature and refrigerator were in the third week, with 359.47 16.95 and 254.03 6.34. Another finding was that the highest total bacterial colonies at room temperature and in the refrigerator were in the third week, with 3.33 0.89 and 2.8 0.76. It can be concluded that the buffalo Dadih from Gayo has a pH value and a total value of bacterial colonies that meet SNI standards. Meanwhile, the total titrated acid in Dadih does not yet have an SNI standard.
Macrozoobenthic Community in Different Mangrove Condition: Relation with Chemical-Physical Sediment Characteristics Isman, Muhammad; Mashoreng, Supriadi; Werorilangi, Shinta; Isyrini, Rantih; Rastina, Rastina; Faizal, Ahmad; Tahir, Akbar; Burhanuddin, Andi Iqbal
Torani Journal of Fisheries and Marine Science VOLUME 1 NOMOR 2, JUNI 2018
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (15.153 KB) | DOI: 10.35911/torani.v1i2.4441

Abstract

The existence of mangrove in coast areas have both ecologic and physical important functions.  Mangrove is a high productive ecosystem. Litters from fallen leaves and twigs are organic sources for macrozoobenthic life.  The aim of this research was to determine the response of macrozoobenthics on total organic matter content and other chemical-physico characters of sediments due to differences in mangrove conditions. This research was conducted from May to September 2016 in Sub-district of Ampallas, Distric of Mamuju, Province of West Sulawesi, Indonesia. Sediments in 20 cm2 transects were collected using small shovel to obtain the macrozoobenthic samples. The sediments contained macrozoobenthics were sieved using a 1 mm mesh size sieve net. Four sampling sites were chosen, each to represent areas with no mangroves, low, medium, and high densities.  The total of organic matter samples were collected using 2 inch diameter of PVC pipe cores, which were analyzed further using Loss by Ignition method.  Besides total of organic matter, several parameters (i.e. redox potential, sediment pH, salinity, temperature, and dissolved oxygen) were measured.  The results showed that gastropods dominated the existed macrozoobenthics.  Gastropods and oligochaete lived in greater amounts in high mangrove density site with higher organic matter content and fine substrate.Keywords: mangroves, macrozoobenthics, organic matter, Distric of Mamuju 
Variability of Marine Carbonate Systems in Seagrass and Coral Reef Ecosystems of Pari and Lombok Islands, Indonesia Afdal, Afdal; Bengen, Dietriech G.; Wahyudi, A’an Johan; Rastina, Rastina; Purwiyanto, Anna Ida Sunaryo; Prayitno, Hanif Budi; Hamzah, Faisal; Suteja, Yulianto; Adi, Novi Susetyo; Koropitan, Alan F.
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 30, No 2 (2025): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.30.2.221-236

Abstract

The increase in anthropogenic CO2 emissions has induced significant physical and biogeochemical alterations in oceans worldwide, including warming, acidification, and oxygen depletion. Coastal areas are particularly vulnerable due to intensified human activities and terrestrial influences, resulting in increased coastal ocean acidification driven by atmospheric CO2 absorption and regional biological and anthropogenic processes. However, research on the collective impact of land-sea interaction and air-sea CO2 exchange on coastal ocean acidification in severely disturbed areas, such as the small islands of Lombok and Pari in Indonesia, remains limited. This study aims to investigate the daily fluctuations in marine carbonate systems and aragonite saturation (Ωarag) levels in the vicinity of seagrass and coral reef habitats in Pari Island and Sire Bay, Lombok. Seawater samples were collected from Sire Bay, Lombok, and the coastal waters of Pari Island to analyze the carbonate systems, CO₂ flux, and metabolic processes. The findings indicate that Pari Island's coastal waters are more susceptible to ocean acidification than Sire Bay, Lombok, showing significantly lower pH values and Ωarag (P<0.05), ranging from 7.60 to 8.00 and 1.04 to 2.54, respectively. This disparity arises from the decreased temperature and salinity in Pari Island's coastal waters during the northwest monsoon, coupled with the deteriorated state of the seagrass and coral reef ecosystems, altering the equilibrium of ecosystem productivity and calcification. The study underscores the necessity of adopting specific coastal management tactics to lessen the effects on fragile ecosystems, highlighting the urgency for additional studies to evaluate adaptive and conservation strategies to preserve coastal biodiversity and ecosystem services.
Internal Auditors’ Role in Shaping the Effectiveness of Internal Control System in Manufacturing Companies Rastina, Rastina; Ratnawati, Ratnawati; Astanty, Wamika Febri; Idrus, Muhammad Ishlah
International Journal of Social Science and Business Vol. 9 No. 2 (2025): May
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/ijssb.v9i2.101313

Abstract

The Internal Control System (ICS) is a fundamental mechanism for ensuring operational effectiveness, regulatory compliance, and the reliability of financial reporting, particularly within manufacturing companies that face complex production processes and heightened risk exposure. This study analyzes internal auditors’ perceptions of ICS effectiveness in the manufacturing sector, focusing on five critical factors: the gap between formal ICS design and practical implementation, the extent of top management support, auditor independence, auditors’ competence in technology-based systems such as ERP, and the organizational culture toward auditing. A descriptive qualitative method was employed, combining semi-structured, in-depth interviews with seven internal auditors from three medium- and large-scale manufacturing companies, supplemented by documentation review. The sample was deliberately chosen because medium- and large-scale firms typically operate with more complex internal controls and higher exposure to financial and operational risks, making them particularly relevant for assessing ICS effectiveness. The number of interviews (seven) was deemed appropriate to achieve thematic saturation while still allowing for in-depth exploration of auditors’ individual experiences. Data were thematically analyzed to identify recurring patterns in auditors’ evaluations. The findings indicate that auditors who perceived strong managerial support, technological readiness, and a culture that values auditing reported positive perceptions, thereby reinforcing ICS effectiveness. Conversely, perceptions turned negative when auditors encountered structural inconsistencies, technological limitations, and inadequate responses to audit recommendations. The study concludes that ICS effectiveness in manufacturing is shaped not only by the technical robustness of control systems but also by the subjective experiences and perceptions of internal auditors. These insights provide a valuable basis for management to strengthen ICS design through enhanced independence, competence, and an audit-supportive organizational culture.
Co-Authors Afdal Afdal, Afdal Ahmad Faizal Akbar Tahir, Akbar Alan Frendy Koropitan Amir Yarkhasy Yuliardi Andi Iqbal Burhanuddin Anna Ida Sunaryo Purwiyanto Astanty, Wamika Febri Azhari Azhari Dietriech Geoffrey Bengen Faisal Hamzah Hanif Budi Prayitno Hasan, Denny Irmawati Helmi, T Zahrial Idrus, Muhammad Ishlah Imalpen, Imalpen Isman, Muhammad Isyrini, Rantih Novi Susetyo Adi, Novi Susetyo Rasmaidar Rasmaidar Ratnawati Ratnawati Shinta Werorilangi, Shinta Sitepu, Dinda Meilinda Br Supriadi - Teuku Reza Ferasyi Tirtama, Wahyu Tri Prartono Wahyudi, A’an Johan Yulianto Suteja