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Phytoplankton Abundance and Distribution Chloropyll-a in Reservoir Lubis, Syahnan Aly; Pratiwi, Niken Tunjung Murti; Effendi, Hefni
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 13, No 1 (2024): APRIL 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.1.33923

Organic matter entering through the inlet and activities in the Koto Panjang Reservoir body is feared to be the main source of nutrient contribution in the form of nitrogen (N) and phosphate (P) for reservoir waters. Nutrients N and P are utilised by phytoplankton in the photosynthesis process. If this condition continues, it is feared that it will affect water quality (blooming algae) which has an impact on aquatic biota. This study aims to determine the type and abundance of phytoplankton along with the distribution of chlorophyll a in reservoir waters. This study used descriptive, qualitative and quantitative methods and analysed the distribution of chlorophyll a using surfer software. Based on the results of the study, it is known that water quality is relatively good with temperatures ranging from 26-310C, brightness ranging from 0.69-1.96 m, dissolved oxygen (DO) is 5.60-6.80 mg/L and turbidity is 1-6 NTU. The results showed that phytoplankton composition was composed of 5 classes consisting of Euglenophyceae (1 species), Cyanophyceae (3 species), Conjugatophyceae or Zygnematophyceae (4 species), Chlorophyceae (4 species) and Bacillariophyceae (10 species). The dominating class in the reservoir zonation is different. In the riverine zone the Bacillariophyceae class dominates by 60.06%, in the transition zone the Cyanophyceae class by 91.60% and in the lacustrine zone the dominating class is Conjugatophyceae or Zygnematophyceae by 78.69%. Phytoplankton abundance ranged from 166.5-2,193 sell/m3. The highest abundance was located in the lacustrine zone and the lowest abundance in the riverine zone. The distribution of chlorophyll a in Koto Panjang Reservoir is varied, the highest distribution is located in the transition zone to the lacustrine zone.

Phytoplankton Abundance and Distribution Chloropyll-a in Reservoir Lubis, Syahnan Aly; Pratiwi, Niken Tunjung Murti; Effendi, Hefni
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 13, No 1 (2024): APRIL 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.1.33923

Organic matter entering through the inlet and activities in the Koto Panjang Reservoir body is feared to be the main source of nutrient contribution in the form of nitrogen (N) and phosphate (P) for reservoir waters. Nutrients N and P are utilised by phytoplankton in the photosynthesis process. If this condition continues, it is feared that it will affect water quality (blooming algae) which has an impact on aquatic biota. This study aims to determine the type and abundance of phytoplankton along with the distribution of chlorophyll a in reservoir waters. This study used descriptive, qualitative and quantitative methods and analysed the distribution of chlorophyll a using surfer software. Based on the results of the study, it is known that water quality is relatively good with temperatures ranging from 26-310C, brightness ranging from 0.69-1.96 m, dissolved oxygen (DO) is 5.60-6.80 mg/L and turbidity is 1-6 NTU. The results showed that phytoplankton composition was composed of 5 classes consisting of Euglenophyceae (1 species), Cyanophyceae (3 species), Conjugatophyceae or Zygnematophyceae (4 species), Chlorophyceae (4 species) and Bacillariophyceae (10 species). The dominating class in the reservoir zonation is different. In the riverine zone the Bacillariophyceae class dominates by 60.06%, in the transition zone the Cyanophyceae class by 91.60% and in the lacustrine zone the dominating class is Conjugatophyceae or Zygnematophyceae by 78.69%. Phytoplankton abundance ranged from 166.5-2,193 sell/m3. The highest abundance was located in the lacustrine zone and the lowest abundance in the riverine zone. The distribution of chlorophyll a in Koto Panjang Reservoir is varied, the highest distribution is located in the transition zone to the lacustrine zone.

Analisis Spasial Untuk Memprediksi Risiko Bencana Banjir di Daerah Aliran Sungai Lubis, Syahnan Aly; Reynaldi, Ilham; Zakiah, Zakiah; Aprisanti, Rizka
Jurnal Akuakultur Sungai dan Danau Vol 10, No 2 (2025): Oktober
Publisher : Universitas Batangahari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/akuakultur.v10i2.270

Land use change significantly alters the hydrological characteristics of watersheds, especially in rapidly urbanizing river basins like the Citarum, Indonesia. This study aimed to assess the impact of land cover transformation on flood risk by integrating spatial modeling using Cellular Automata–Artificial Neural Network (CA–ANN) with hydrological simulation via HEC-HMS. Multi-temporal Landsat-8 imagery (2014–2024) was used to classify and project land cover to 2029, while Curve Number (CN) values derived from land use types were employed to estimate surface runoff. The results indicated a substantial increase in built-up areas, particularly in the midstream and downstream regions, replacing agricultural lands and reducing vegetative cover. This shift significantly raised CN values across most sub-watersheds, resulting in increased peak discharge, especially in Cikeruh, Cikapundung, and Cibeet. Flood risk mapping showed that over 50% of the sub-watersheds fall into the moderate to high-risk categories, driven by impervious surface expansion and declining infiltration capacity. This integrated spatial–hydrological approach underscores the importance of adaptive land use planning and watershed-based flood mitigation strategies. The findings offer a scientific basis for ecosystem-based disaster risk reduction and inform policy-making in flood-prone urbanizing basins

Edukasi Dan Pelatihan Pembuatan Minyak Rambut Herbal Berbahan Kemiri Untuk Pencegahan Rambut Rontok Di Kelurahan Paya Mabar, Kecamatan Stabat, Kabupaten Langkat Hartini, Putri Tri; Lubis, Syahnan Aly; Nabila; Sry Ulina Karo-karo; Ziza Putri Aisyia Fauzi
Jurnal Pengabdian Magister Pendidikan IPA Vol 8 No 4 (2025): Oktober-Desember 2025
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpmpi.v8i4.13040

Hair loss is a common problem that impacts appearance and self-confidence, so a safe and effective natural solution is needed. Candlenut oil (Aleurites moluccanus) contains essential fatty acids and vitamin E which are beneficial in strengthening the hair and nourishing the scalp. This community service program was carried out in Paya Mabar Village, Stabat District, Langkat Regency, with the aim of increasing community knowledge and skills in making herbal hair oil made from candlenut. A total of 35 participants participated in the activity through counseling, demonstration, and hands-on practice, accompanied by evaluation using pre-test and post-test. The results showed an average knowledge increase of 38%, and 80% of participants succeeded in producing good quality hazelnut oil despite facing constraints on temperature regulation. This program proved effective in improving hair health literacy, natural ingredient processing skills, and opening up entrepreneurial opportunities based on local herbal products.

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