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Fajar Setiawan
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LIMNOTEK
Published by BRIN Publishing
ISSN : 08548390     EISSN : 25498029     DOI : https://doi.org/10.55981/limnotek.xxxx.xxxx
Core Subject : Science, Social, Engineering,
Earth & Planetary Sciences Engineering Environmental Science
The journal establishes an integrated understanding of the interface between natural processes of water resources and inland water ecosystems with their human domains. Incorporating broad themes concerning ecology of inland water ecosystems and perspectives regarding sustainable utilizations of the water resources. Science on inland water ecosystems is an applied multi/interdisciplinary field relating to efforts to monitor, manage, and restore both fresh and brackish water ecosystems. The journal thus underlines significant work that draws on and incorporates elements of hydrology, meteorology, ecology, limnology, ecological economics, and social environmental sciences related to water resources and inland water ecosystems. The journal allows for both monodisciplinary and interdisciplinary submissions and a broad range of methodological approaches, thus appealing to diverse readers. Specific research areas covered include: modeling the impacts of management scenarios (socio-economics-ecological-hydrological impacts); simulation of the alteration of the quality of inland water ecosystems (long-term data series); novel approaches for alternative utilization of inland water ecosystems; the development of novel indices/ criteria to assess the quality of inland water ecosystems; assessments of the economic value of inland water ecosystems’ ecosystem services; the advances of alternative governance to sustainably manage inland water ecosystems; progress on alternative conservation strategies for inland water ecosystems; the development of alternative technologies to mitigate impacts of anthropogenic activities on inland water ecosystems; the advances of technologies to rehabilitate and to restore the quality of inland water ecosystems, water disaster risks and disaster preparedness, resiliencies of water infrastructure and management. Further, research on water resources is concerned with the conservation of quantity and quality of water. Thus, topics related to water resources such: water resources management, water resources information system, water policies and planning, hydrology and hydrogeology, water quality and environment, hydraulics, water and wastewater treatment sustainability, resilience, and adaptation of water resources and infrastructure to uncertain and evolving environments, surface and groundwater resources will be important key part from the journal.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Proses Permukaan Bumi
Articles 47 Documents
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Integrated Field Theoretical Evaluation of Sediment Pond Efficiency in a Tropical Mining Catchment Bella Koes Paulina Cantik; Elenora Gita Alamanda Sapan; Ramon Putra; Belly Martin; Josh Kevin
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 31 No. 2 (2025)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2025.13506

Abstract

Sediment ponds in coal mining operations serve as critical infrastructure for wastewater management. A major challenge in their operation is excessive sediment accumulation, which is often difficult to anticipate accurately, especially when relying solely on theoretical calculations. Such circumstances highlight the importance of an approach that is not solely theoretical, but also considers the actual dynamics observed in the field. The coal mining sediment pond examined in this study was initially constructed to accommodate a catchment area of 205 Ha, with a useful life of 10 years. However, the pond has reached full capacity in less than five years, 53% earlier than expected, indicating the need for re-evaluation, especially as the catchment area is planned to expand to 885 Ha. This study aims to evaluate, compare, and recalculate the sediment pond’s capacity under expanded catchment conditions (885 Ha), by integrating field-based measurements and theoretical sediment yield methods to produce a more representative design. The methods employed include the Revised Universal Soil Loss Equation (RUSLE), Lane & Kalinske’s Approach, Einstein’s Approach, Brook’s Approach, and Chang, Simons, and Richardson’s Approach. RUSLE utilizes secondary data, while the other methods incorporate both primary and secondary data. The results show a wide range of sediment transport estimates, from 20,184 m3 using Einstein’sto 507,075 m3 using Chang’s. Among the evaluated methods, Lane and Kalinske, as well as Brook, produced sediment volume estimates that closely matched field-based measurements, making them suitable for field conditions. RUSLE produced a lower-bound estimate, while Einstein and Chang’s method deviated significantly from the observed range. These findings underscore the importance of integrating field measurements with theoretical models to enhance the reliability of sediment-yield estimation and support informed decision-making in sediment pond.
Life‑History Responses of Daphnia to Catfish Kairomones: Does Ipomoea aquatica Function as an Effective Refuge? Mochamad Haikal Haikal; Majariana Krisanti; Niken Tunjung Murti Pratiwi; Pelita Octorina
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 32 No. 1 (2026)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2026.14136

Abstract

Zooplankton, particularly Daphnia sp., play a key role in aquatic food webs and exhibit strong life‑history plasticity in response to predation risk mediated by chemical cues (kairomones). Aquatic macrophytes such as water spinach (Ipomoea aquatica) are often assumed to provide refuge that may mitigate these effects. This study examined the influence of catfish (Clarias sp.) kairomones and the potential moderating role of I. aquatica on reproduction and survival of Daphnia sp. using an individual‑based bioassay with a randomized block design. Four treatments were applied: control, I. aquatica, kairomones, and kairomones + I. aquatica, observed in 15 days. Parameters measured included neonate number, age at first and second reproduction (AFR, ASR), Second Clutch/First Clutch ratio (C2/C1 ratio), and mortality. Kairomone exposure significantly reduced first‑clutch offspring production and delayed AFR, and induced compensatory reproduction in the second clutch, reflected by the highest C2/C1 ratios (K = 2.30; H = 2.11). Mortality was also highest in kairomone treatments (>42%). The presence of I. aquatica did not significantly mitigate kairomone effects and was associated with increased mortality relative to the control. These results indicate that chemical predator cues dominate over physical shelter in shaping Daphnia sp. life‑history strategies, with important implications for zooplankton dynamics in vegetated freshwater ecosystems.
Comparison of Chemical Oxygen Demand Removal Using Zeolite Adsorption and Floating Treatment Wetlands in Polluted River Water Fifia zulti; Chrisantha Cecilia Yobelina Tumanggor; Rifka Noor Azizah
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 32 No. 1 (2026)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2026.14185

Abstract

The Citarum River in Bandung, West Java, provides drinking water, irrigation, and industrial resources for the local community. However, the recent increase in textile industry activity has reduced water quality, with textile waste contributing significantly to organic pollution in tropical inland waters. Addressing these environmental challenges requires treatment technologies to protect public health and the integrity of the region's ecosystem. This study aims to evaluate the adsorption performance of natural zeolite using the tea bag method (laboratory scale) and investigate its integration with a floating treatment wetland (FTW) system planted with Canna indica (mini-pilot scale) to reduce chemical oxygen demand (COD) under tropical environmental conditions. Batch experiments were conducted using real textile wastewater with an initial COD concentration of approximately 752 mg/L to reflect actual pollution levels. The tea bag adsorption system showed a maximum COD reduction of 43%, while the integrated FTW system achieved a higher COD reduction of 48% after 24 days of operation. The enhanced performance of the FTW system relative to the tea bag system results from the combined effects of zeolite adsorption, microbial biodegradation, and improved oxygen transfer facilitated by the Canna indica root system. Experimental findings indicate that the integrated FTW system offers a sustainable, cost-effective, and nature-based approach for improving water quality in tropical inland waters affected by industrial pollution. Nevertheless, additional optimization is required to achieve compliance with regulatory discharge standards.
Assessing Data Quality in Real-Time River Water Quality Monitoring using Multi-Parameter Indicators: A Case Study of Ciliwung and Cisadane, Indonesia Satmoko Yudo; Dwi Nowo Martono; Dwita Sutjiningsih; Budi Kurniawan
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 32 No. 1 (2026)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2026.14216

Abstract

Water pollution has become a complex environmental challenge in rapidly urbanizing Southeast Asia. Indonesia has deployed over 347 online river water quality monitoring stations (ORWQM) in several watersheds to provide real-time data for pollution control and informed ecological decision-making. However, problems have arisen with some of the longstanding stations, including equipment degradation, data loss, sensor malfunctions, and inconsistencies, raising concerns about the reliability of these datasets. This study aims to address these issues by using a hybrid Total Data Quality Management (TDQM), Online Data Quality Evaluation Model (ODQEM) framework to evaluate and improve the data quality at four stations (Manggarai, Kelapa Dua, Pasar Baru, and Empang Dam) representing the upstream and downstream areas of the Ciliwung and Cisadane Rivers. The workflow consists of four steps: (i) defining the relevant data quality dimensions; (ii) measuring data quality using completeness index, range validity, accuracy, uniqueness, and stability index; (iii) analyzing cross-parameter and cross-station patterns to identify potential failure modes and governance gaps; and (iv) translating findings into targeted calibration, cleaning, and maintenance actions. The results show strong structural integrity; completeness indicators reach 100%, and uniqueness exceeds 99.9%, indicating robust acquisition and temporal consistency. However, functional reliability varies widely across parameters and station locations. Completeness indicators for non-zero values show systematic zero values for the DO probe (1.02%) and nitrate (0.19%) at Empang Dam Station; TDS (9.57%) at Pasar Baru Station; ammonia (60.02%) at Kelapa Dua Station. Overall stability is high for physical probes (temperature, pH), but low for chemical/ion probes at some stations (salinity 1.47%–6.62%; TDS 5.49%–10.92%; ammonia 30.20%–71.40%). Ion sensors also show higher risks, including low validity or accuracy for nitrate at Kelapa Dua Station (61.67%). These findings indicate that the dataset appears complete and valid, but still contains substantial functional uncertainty due to several zero-value parameters and unstable sensor behavior. Because the evaluation is limited to four stations, these findings should be interpreted as an in-depth case study rather than a complete representation of the ORWQM network in Indonesia. The proposed TDQM–ODQEM Data Governance Model offers a replicable method for improving online and real-time environmental monitoring, helping bridge the gap between technological performance and policy design in sustainable river management.
Quantitative Prediction of Spirulina platensis Biomass Using UV-Vis Spectrophotometry Fajar Sumi Lestari; Agustino Zulys; Awalina Satya
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 32 No. 1 (2026)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2026.14459

Abstract

Spirulina platensis has become a promising feedstock for the synthesis of several industrially important biomolecules, including proteins, lipids, and carotenoids. However, significant technological obstacles pertaining to optimization, growth monitoring, and biomolecule extraction in Spirulina remain despite advancements in industrial-scale microalgae production and biomolecule harvesting. Standard techniques used for microalgal biomass and biomolecules monitoring include FTIR spectroscopy, colorimetric techniques, and manual cell counting. However, these techniques have drawbacks, particularly processing time and handling errors. This paper seeks to establish an operational equation that effectively relates measured absorbance (or optical density, OD) to the dry weight of Spirulina platensis microalgae using a UV-Vis spectrophotometer. The wavelengths of 680, 750, and 565 nm were selected based on the absorption spectrum of chlorophyll-a, as well as the wavelengths at which absorbance does not reach its peak. The best results were obtained at a wavelength of 680 nm with the equation y = 1.2759x + 0.1512, with an R² value of 0.9914. This technique allows for more accurate measurement of Spirulina platensis dry weight and total biomass.
Assessment of Habitat Characteristics Influencing Fish Diversity in the Ijo River, Central Java, Indonesia Siti Rukayah; Agus Nuryanto; Windiriani Lestari; M. Husein Sastranegara,
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 32 No. 1 (2026)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2026.14811

Abstract

Freshwater fish populations are highly sensitive to habitat variation, yet information on how habitat characteristics shape fish diversity in Central Java rivers remains limited. The Ijo River is an important natural system for evaluating ecological factors that determine fish communities. This study aims to assess the physical and chemical characteristics of the Ijo River and evaluate their influence on fish diversity. Research was conducted using survey methods and purposive random sampling at nine stations across three zones: upstream, middle, and downstream. The results obtained are that the environmental parameters varied across river zones. The downstream zone recorded the highest temperature (29.14°C), greatest depth (2.54 m), widest channel (32.97 m), and highest free CO₂ (12.64 ppm). The upstream zone showed the greatest light penetration (74.43 cm), fastest Current Velocity (0.75 m/s), highest dissolved oxygen (5.28 ppm), and highest pH (8.31). Fish diversity also differed between zones. The downstream zone had the highest abundance (4,885 individuals) and greatest dominance (0.17), whereas the upstream zone exhibited the highest Shannon-Wiener diversity index (2.46) and evenness (0.36). These results indicate that upstream zones, with lower temperatures, faster currents, higher dissolved oxygen, and stable pH, support greater species diversity and evenness. Downstream zones, with higher temperatures, elevated free CO₂, and wider river width, show greater abundance but are dominated by a few adaptive species. This pattern, consistent with other rivers, confirms that physical and chemical water characteristics shape distribution, abundance, and dominance of freshwater fish. Thus, fish diversity is a key indicator of river ecosystem health.
Vertical Distribution of Chl-a in Relation to Environmental Factors and Water Column Stratification in the Downstream Section of the Air Bengkulu River Kusdini; Sigit Sudjatmiko; Yar Johan; Bakhtiar Deddy; Ela Hasri Windari
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 32 No. 1 (2026)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2026.15445

Abstract

The Bengkulu Watershed, which spans two administrative districts, plays a crucial role in supporting ecological and socio-economic functions in Bengkulu Province, Indonesia. Its main river, the Air Bengkulu, has experienced environmental pressures from land conversion, coal mining activities, domestic waste discharge, and industrial effluents, which may alter downstream water quality and disrupt estuarine ecological processes, including primary productivity. Historically, the adjacent coastal area was utilized by local fishers as a fishing ground in the early 2000s, but this function has since declined. However, studies on the ecological implications of these pressures on phytoplankton production in the Air Bengkulu estuary remain limited. This study aimed to assess phytoplankton productivity using Chl-a concentration as a proxy and examine its relationship with key environmental parameters. Fieldwork was conducted during the peak dry season from June to August 2025, with two sampling sessions per event in the morning and afternoon under spring tide conditions. Observations were carried out at three stations on three sampling events with measurements taken at three depth levels. Salinity, current velocity, dissolved oxygen, and nitrate concentration were measured at all depths, while temperature, pH, and water transparency were limited to surface levels. Chlorophyll-a (Chl-a) concentration was analyzed using spectrophotometric methods and its relationship with environmental parameters was evaluated using correlation analysis and quantile regression. The results showed that Chl-a concentrations were consistently very low across stations, ranging from 0.025 to 0.139 µg/L, indicating ultra-microtrophic to oligotrophic conditions. Among the measured parameters, nitrate concentration and current velocity exhibited the strongest relationships with Chl-a, suggesting their role as primary limiting factors, while other parameters showed comparatively weaker influences. These findings indicate that low nutrient availability and hydrodynamic conditions constrain phytoplankton biomass development and primary productivity in the Air Bengkulu River estuary, potentially limiting its capacity to sustainably support the food web.

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