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Irwan Effendi
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INDONESIA
Jurnal Natur Indonesia
Published by Universitas Riau
ISSN : 14109379     EISSN : 25030345     DOI : https://doi.org/10.31258/jnat
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry
Jurnal Natur Indonesia published since 1998, is a science journal that presents articles on research results, thoughts and views from researchers and experts in the field of biosciences (basic science), including biology, physics, chemistry and mathematics. In the field of biosciences (basic science); Biology, Physics, Chemistry, Mathematics.
Arjuna Subject : Biokimia, Genetika dan Biologi Molekuler - Biokimia, Genetika dan Biologi Molekuler (Lain-Lain)
Articles 306 Documents
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Stomatal Characteristics in Three Groups of Mangrove Plants: Major, Minor, and Associate Febrina Artauli Siahaan; Dewi Lestari
Jurnal Natur Indonesia Vol 21, No 2 (2023): October
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.21.2.144-148

Abstract

Three types of mangroves inhabit different environmental gradients and zones within the mangrove ecosystem. These three mangrove types exhibit distinct adaptation strategies. Stomata, as a crucial organ of the plant system, play a significant role in the adaptability of plants. Understanding stomata is essential for comprehending the physiological conditions and responses of plants to environmental conditions. This research aimed to study the stomatal characteristics of three different mangrove types and gain a deeper understanding of their potential adaptive strategies. This research was conducted at the Mangrove Botanical Garden Gunung Anyar, Surabaya, in November 2022. We selected two representative mangrove species from the major, associate, and minor types. Stomata of each mangrove species were observed to identify the stomatal type, density, and size using an Olympus microscope at 100 xs and 400 x magnifications. The results showed there were variations in stomatal type, density, and stomatal length and width among studied mangrove types. Major mangrove species exhibited the lowest stomatal density and the largest size of stomata compared to minor and associated mangroves. The diversity of stomatal traits among major, associate, and minor mangrove types underscores their adaptations and ecological strategies.
Optimalization of Water for Nursery and Rearing of Asian Redtail Catfish (Mystus nemurus C.V) Mulyadi Mulyadi; Niken Ayu Pamukas
Jurnal Natur Indonesia Vol 21, No 2 (2023): October
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.21.2.109-117

Abstract

Fish culture activities usually release wastes to environments such as faeces, urine, uneaten food and other by-product metabolism activities. For increased water quality, ideally in aquaculture media, various methods could be used, such as filtering techniques and sinking and dissolving methods. Various filter materials could be used to increase water quality, such as silt, gravel, charcoal, coconut shell, palm fiber, and zeoliteThe study on the effect of recirculation systems using various filter materials and aquaponic systems on water quality has been carried out. Several filter materials were used in four kinds of treatment,  namely aquarium using aerators (control), aquarium using silt, gravels and palm fiber (recirculation), aquarium using mustard greens (aquaponic system) and aquarium using spoons (recirculation). The study results showed that different filter materials significantly affected nitrate and nitrite concentration in the catfish culture media. It was invented that the treatment of a recirculation system combined with an aquaponic system could increase water quality parameters such as  CO2 (7.99 - 11.98 mg.L-1), NH3 (0.02 - 0.07 mg.L-1), NO2 (2.43 - 0.02 mg.L-1), NO3 (4.32 - 0.04 mg.L-1) respectively. Still, the other water quality parameters were similar. The best results were achieved at the same treatment, namely absolute growth rates  (4.01 g), daily growth rates  (1.96 %) and survival rates (91.11 %), respectively
Identification of Pathogenic Bacteria from Nile Tilapia Oreochromis niloticus in Freshwater of Sigi Regency, Central Sulawesi Usy Nora Manurung; Wijanarko Wijanarko; Serli Mauru; Melani Manurung
Jurnal Natur Indonesia Vol. 22 No. 1 (2024): April
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.1.1-6

Abstract

This research aims to identify the types of bacteria that infect tilapia (Oreocromis niloticus) cultivated in Sigi Regency and analyze air quality parameters (temperature and pH). This research was carried out from May to July 2023. Bacteria was isolated and identified at the Fish Quarantine Station Testing Laboratory, Quality Control and Safety of Fishery Products in Palu City. The target organ examined is the kidney. Bacteria were grown on TSA media and then isolated. On bacteria, Gram staining, motility, aerobic, catalase, oxidase, O/F, glucose, and Rimlershots media tests were carried out for Aeromonas hydrophila. Based on the test results, bacterial identification was done using the Manual to Identify Medical Bacteria. Of the 50 samples identified, 25 types of pathogenic bacteria were found that attack tilapia. In Sigi Biromaru District, there were seven types of bacteria Bordetella sp, Pseudomonas alcaligenes, Pasteurella sp, Moraxella sp, Shigella sp, Enterobacter sp, Achromobacter sp. In Dolo District, there were ten types of bacteria, namely Flavobacterium sp, Achromobacter sp., P.haemlytica, Alcaligenes sp, A.salmonicida, Actinobacillus sp, Plesiomonas shigelloides, A.sobria, Citrobacter sp, and Chromobacterium sp. In the Dolo Barat District, there are eight types of bacteria: P.shigelloides, Veillonella sp, Acinetobacter sp, Pasteurella sp, Plesiomonas sp, Bacillus sp, Enterococcus sp, and A.caviae. In Sigi Kota District, there are eight types of bacteria, namely Plesiomonas sp, P.haemlytica, P.alcaligenes, Klebsiella sp, Legionella sp, A.caviae, Eikenella corrodens, and Moraxella sp. In Marawola District, there are seven types of bacteria, namely P.haemlytica, E.corrodens, Klebsiella sp, Acinetobacter sp, Pasteurella sp, P.shigelloides, and Moraxella sp
Addition of Chaetomorpha sp Extract on the Growth and Hematology of Tilapia (Oreochromis niloticus) Sri Wahyuni; Hayatun Nufus; Asri Mursawal; Ronal Kurniawan
Jurnal Natur Indonesia Vol. 22 No. 1 (2024): April
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.1.7-11

Abstract

The use of phytoimmunostimulants from Chaetomorpha sp which is environmentally friendly and cost-effective. Apart from that, secondary metabolite compounds found in Chaetomorpha sp can improve the immune system. So, it can increase the fish's resistance to disease attacks, improve the digestive system, increase the fish's appetite, and save on feed use. This can be seen from hematological and physiological parameters. Therefore, researchers are interested in researching the effectiveness of the macroalgae Chaetomorpha sp as a phytoimmunostimulant. This research aims to look at the growth of tilapia and the immune system, which includes hematology and physiology of fish fed with warm water extract of Chaetomorpha sp for 30 days of maintenance. Data analysis used One-way ANOVA, and homogeneity was seen. If the analysis results show an effect, it is tested further using Student Newman Keuls (SNK). The research results show that adding Chaetomorpha sp extract influences the growth rate and survival of tilapia fish that are kept for 30 days. This maintenance shows that the administration of Chaetomorpha sp extract with a dose of 50mL/kg feed (T2) gave the best results on growth rate, feed efficiency, hematology, and tilapia survival, namely absolute weight 18.30g, LPS 5.38%/day, absolute length 3.98 cm, FCR 1.44, feed efficiency 69.18%, total erythrocytes 1.85x106 cells/mm3, hemoglobin 6.67 g/dL, hematocrit 35.33-37.67%, total leukocytes 2.42x104 cells/mm3, leukocrit 2.67%, blood glucose 43% and survival 93.33%.
Isolation and Antimicrobial Activity of Endophytic Fungi on Avicennia marina and Sonneratia alba Mangroves in Mengkapan Village, Sungai Apit District, Siak Regency Esti Nur Rahayu; Efriyeldi Efriyeldi; Ummi Mardhiah Batubara
Jurnal Natur Indonesia Vol. 22 No. 1 (2024): April
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.1.12-20

Abstract

This research was conducted from February to June 2023. A sampling of Avicennia marina and Sonneratia alba mangroves was conducted in the mangrove ecosystems of Mengkapan Village, Sungai Apit District, Siak Regency. This research aims to identify the species and test the antimicrobial activity of endophytic fungi found in the leaves and stems of A. marina and S. alba mangroves in the mangrove ecosystem of Mengkapan Village using survey and experimental methods. This research began by determining the sampling location and measuring the physical and chemical parameters of the mangrove environment. Then, sampling and preparation of A. marina and S. alba mangrove samples were carried out to isolate the endophytic fungi. After isolation, macroscopic and microscopic characterization was done to identify endophytic fungi. The diameter increase of the endophytic fungi was measured and calculated, and the antagonism activity test of the endophytic fungi was carried out. The antimicrobial index of endophytic fungi was measured against the pathogenic bacteria Vibrio sp and E. coli. This research obtained that 12 endophytic fungi were isolated from the mangroves A. marina and S. alba: two genera Rosellinia, two genera Pythium, four genera Hansfordia, and four genera Aspergillus. Based on the test results, all genera found in this research inhibited the growth of E. coli with inhibitions of 75.99% (Rosellinia sp), 87.70% (Pythium sp), 73.42% (Hansfordia sp) and 86.88% (Aspergillus sp). However, only three genera inhibited the growth of Vibrio sp by more than 50%, with inhibitions of 85.23% (Rosellinia sp), 87.87% (Hansfordia sp), and 86.07% (Aspergillus sp).
Effect of Different Salinity on the Growth of Chlorella sp in Laboratory Scale Culture Irwan Effendi; Mega Novia Putri; Ulfi Laili Astika; Ronal Kurniawan
Jurnal Natur Indonesia Vol. 22 No. 1 (2024): April
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.1.21-27

Abstract

This study aimed to determine the optimal salinity in increasing the growth rate of Chlorella sp in laboratory scale culture. This research was conducted in July 2023 at the Marine Biotechnology Laboratory, Faculty of Fisheries and Marine Sciences, Universitas Riau. The experimental method was applied using a complete randomized design (CRD) with four treatments and three replicates. The treatments were as follows: T0 (control), T1 (25 ppt salinity), T2 (30 ppt salinity), and T3 (35 ppt salinity). The initial density of Chlorella sp was 250x103 cells/mL, and cell abundance observations were carried out for 14 days. The parameters observed were cell abundance, specific growth rate, and water quality (temperature and pH). The results showed that different salinity influenced the growth of Chlorella sp. 35 ppt salinity gave the best results on cell abundance of 266.66x104 cells/mL, with peak population occurring on day 10. Water quality during the study was still in the normal range and can be tolerated for the growth of Chlorella sp, and the temperature ranged from 25-31oC and pH 6.4-8.0
Sustainable Marine Ecotourism Development Strategy at Barambang and Sibintang Beach, Central Tapanuli Regency Shofian Nanda Adiprayoga; Husnul Yaqin Harahap; Ronal Kurniawan; Tirta Anugerah; Okta Rizal Karsih
Jurnal Natur Indonesia Vol. 22 No. 1 (2024): April
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.1.28-34

Abstract

When the holiday season approaches, local and foreign travellers flock to Barambang Beach's and Sibintang Beach's ecotourism regions, which are well-known tourist destinations. Nonetheless, inadequacies in the administration of ecotourism attractions occasionally result in low weekday and weekend visitor numbers at Barambang and Sibintang beaches. Since local populations rely on ecotourism activities for their livelihoods, this influences such activities but is not felt as much by those communities. The study was conducted in 2022 between July and September. A mixed methodology, along with an explanatory qualitative approach, was used in the study. The significant data used in the analysis came from interviews with a variety of participants as well as assessments of the water quality and ecology. Secondary data from some relevant document sources was gathered in the interim. The data analysis used Willingness to Pay (WTP), Willingness to Accept (WTA), economic potential, and SWOT analysis. The study findings indicate that the development plan can be implemented by including auxiliary facilities, such as signs informing visitors of the location of auxiliary facilities, directions, and the farthest swimming-safe water point. Tourists are also eagerly awaiting the establishment of eco-friendly play facilities. Additionally, the government can enact laws that give local community-run businesses regular direction and funding access
The Effect of the Utilization of Fermented Tofu Waste Products on Hatching Rate and Survival Rate of Climbing Perch (Anabas testudineus) Hisra Melati; Fakhrunnas MA Jabbar; Safitriani Safitriani
Jurnal Natur Indonesia Vol. 22 No. 1 (2024): April
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.1.35-40

Abstract

Climbing perch (Anabas testudineus) is a type of swamp fish that has the potential to be cultivated. The obstacle faced in developing climbing perch cultivation is that the eggs produced are very few and vulnerable to inorganic substances or waste because it takes quite a long time to reach seed size. Climbing perch usually food aquatic plants such as kiambang, weeds, and other small animals and insects. It analyzes the effect of various concentrations of tofu liquid waste on the transparent hatchability and survival of climbing perch larvae and the use of research results on the influence of various concentrations of tofu liquid waste on the transparent hatchability and survival of climbing perch fish larvae. A 100% concentration of tofu liquid waste produced the highest survival in the P4 treatment (64.00%), and the lowest concentration without giving tofu liquid waste concentration at P0 was (40.00%). A 100% concentration of tofu liquid waste produced the highest hatchability in the P4 treatment ( 60.00 %), and the lowest concentration without providing tofu liquid waste at P0 was (42.00 %). The research fulfilled the maintenance requirements by utilizing fermented tofu liquid waste as a medium for rearing climbing perch eggs and larvae. It is not possible to use 100% tofu liquid waste for climbing perch, and it is not possible to use 100% tofu liquid waste for climbing perch larvae in the long term
Mangrove Conservation Based Strategy in Ecotourism Development as Part of “Banyuurip Mangrove Centre’’ Coastal Resources Management in Gresik Regency, East Java, Indonesia Umi Zakiyah; Woro Wuninggar
Jurnal Natur Indonesia Vol. 22 No. 1 (2024): April
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.1.41-47

Abstract

Banyuurip Mangrove Center (BMC) is a form of mangrove ecosystem conservation and utilization in Banyuurip Village that still faces obstacles in its ecotourism sector management. This study aims to determine the condition of mangroves in BMC, identify Internal Factor Analysis Summary (IFAS) and External Factor Analysis Summary (EFAS), and develop the best strategies for BMC management based on its mangrove condition. This research uses a survey method that includes the data obtained from respondents and the in-situ data on mangrove conditions. Analysis of mangrove data includes identification of species, density, and relative density. Meanwhile, data from the respondents, including tourists and management staff, were analyzed using SWOT analysis. Based on research results, it was known that mangroves in BMC are in relatively good condition. From the respondent questionnaire using SWOT analysis, the best strategy to be suggested is the SO strategy. These strategies must include government support by maximizing its advantages, utilizing social media for promotion, developing mangrove nurseries to produce quality mangrove seedlings, collaborating with Perlindungan Masyarakat (LINMAS) or Community Protection to improve security, and their economic sector by involving the society in another factor of the ecotourism management such as mangrove processing
Analysis of Oil Spill Distribution in Bintan Utara Waters Using Sentinel-1A Satellite Imagery Akhmad Ferdinan Hairo; Mubarak Mubarak; Dessy Yoswaty; Bintal Amin; Ilham Ilahi
Jurnal Natur Indonesia Vol. 22 No. 1 (2024): April
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.1.48-56

Abstract

Oil spills are a significant concern in the waters surrounding Bintan, Indonesia primarily due to tankers releasing ballast water before anchoring at the nearby port of Singapore, particularly during the north wind season. The region's high cloud cover presents challenges for detection efforts. However, the utilization of Sentinel-1 Satellite imagery offers a promising solution. This study aims to analyze the spatial distribution of oil spills in North Bintan waters using data collected from the Sentinel-1A satellite between December 2023 and January 2024. The study area includes Semelur Hamlet in Berakit Village, Bintan Regency. The analysis of data consists of oil spill detection and oil content. The results that the wind speed was measured within the range of 2 - 3.8 m/s, while the current speed fell within the range of 0.12 - 0.24 m/s. Additionally, the oil content was found to be less than 1 mg/l. The analysis conducted on the acquisition of December 6 - 24, 2023 revealed the presence of oil spills in four distinct areas. The spill areas were measured to be 1109 m2, 346 m2, 4258 m2, and 1491 m2, respectively. The windrose diagram reveals that the prevailing wind originates from the north northwest, accounting for 16% of the total wind occurrences. The average wind speed within this direction ranges from 3.6 - 5.7 m/s. Notably, the highest wind speed recorded exceeds 11.1 m/s and is observed to come from the north. The relationship between the process of image acquisition and the windrose diagram elucidates the impact of wind on the dynamics of oil spill movement

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