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Lalu Japa
Universitas Mataram
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Immunology & microbiology Materials Science & Nanotechnology Mathematics Physics

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Phytoplankton as Bioindikator of Water Quality in The Batu Dendeng River West Lombok Afiatul Hafifah; Agil Al Idrus; Lalu Japa
Jurnal Biologi Tropis Vol. 23 No. 3 (2023): July - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v23i3.5407

Abstract

This exploratory descriptive study with a qualitative approach was aims to analyze the water quality of the Batu Dendeng River in West Lombok through a study of the phytoplankton community structure. Sampling was carried out using purposive sampling method. Water sampling was carried out using plankton net of 20µ mesh sized. Observation and identification of phytoplankton was carried out at the Biology Laboratory of FKIP University of Mataram using a binocular microscope. Phytoplankton data was analyzed based on abundance, species diversity, species uniformity and species dominance indexs. The results showed that the community structure of identified phytoplankton in the Batu Dendeng River consisted of 5 classes and 52 species with abundance value of 714.074 (ind/L). Phytoplankton species diversity, uniformity, and dominance indexs of Batu Dendeng River were 2.591, 0.66, and 0.13 respectively. The water pollution criteria based on the diversity index of phytoplankton species, indicates the water quality of the Batu Dendeng River West Lombok was in the slightly polluted category.
Hubungan Keterampilan Berpikir Kreatif dengan Hasil Belajar Biologi Peserta Didik SMA Negeri di Kota Mataram Baiq Diana Safitri; Jamaluddin Jamaluddin; Lalu Japa
Jurnal Ilmiah Profesi Pendidikan Vol. 8 No. 3 (2023): Agustus
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jipp.v8i3.1586

Abstract

Diversity of Orchids in Tahura Nuraksa Central Lombok as Enrichment of Biodiversity Subject Dita Anggraini Safitri Sipayung; Didik Santoso; Lalu Japa
Jurnal Biologi Tropis Vol. 23 No. 1 (2023): Special Issue
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v23i1.5771

Abstract

This study was done to determine the diversity of orchid species, population structure (abundance, diversity, dominance and distribution patterns) of orchids found in the Tahura Nuraksa and to make a booklet as enrichment of biodiversity courses. The research was conducted at the Tahura Nuraksa Resort, Kalipalang, Central Lombok. The method used in this study was descriptive exploratory by determining the location of observation using purposive sampling method and sampling by using non-destructive and exploratory methods. The results showed that there were 544 individuals from 18 species of orchid . An abundance of orchids of 1% was in the low category, and the dominance of orchids is 0,15% which means that there was a dominant species of orchids, namely Spathoglottis plicata. The orchids diversity index was 2.25 (medium category) and the distribution pattern of orchids in the study sites was generally uniform. The booklet is declared worthy of being an enrichment for study of biodiversity.
The Effect of Egg Shell and Banana Peel Organic Fertilizer on The Growth Of Green Spinach (Amaratus tricolor L.) Nurseha Nurseha; Prapti Sedijani; Lalu Japa
Jurnal Biologi Tropis Vol. 23 No. 4 (2023): October - December
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v23i4.5505

Abstract

Long-term use of chemical fertilizers damages soil properties. Efforts to restore soil fertility by using liquid organic fertilizer are needed. Organic fertilizers from waste provide nutrition for plants while reducing environmental pollution. This study aims to analyze the effect of applying liquid organic fertilizer from banana peels, liquid organic fertilizer from egg shells, and the effect of the combination of liquid organic fertilizers. Two Way Anova test results with sig. a value <0.05 indicates that the POC of banana peel increased plant height, number of leaves, fresh weight and dry weight of green spinach. Eggshell POC increased wet weight and dry weight, while the combination of the two POC increased plant height and number of leaves, wet weight and dry weight of green spinach plants. This shows that the application of banana peel liquid organic fertilizer is more influential than the application of egg shell organic fertilizer.
Analysis of Mangrove Community in The Bagek Kembar Essential Ecosystem Area, West Lombok Harsa Naunik Qudraty; Lalu Japa; Eni Suyantri
Jurnal Biologi Tropis Vol. 23 No. 1 (2023): Special Issue
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v23i1.5799

Abstract

: Bagek Kembar Essential Ecosystem is one of mangrove ecosystem in the Sekotong Bay. In some part of the area has also been used as a pond for mariculture activity so, it can influence the composition and diversity of mangroves in that area. This research was conducted to determine the species composition, importance value index, and diversity of mangrove species. Data of mangrove vegetation were collected in a method combination of line transects and quadrats. Total of 11 transects and 33 quadrats were layed out in the area of the Bagek Kembar mangrove ecosystem. The results of this research showed that there were seven mangrove species as member of 4 genera and 4 families. The highest species dominant index and density was Avicennia marina. The mangrove species diversity index for tree and sapling was 1,000 and 1,003, respectively (both in medium categories) and the diversity index for seedling was in low category (0,676).
Community Structure of Phytoplankton in The Waters of Gili Trawangan, North Lombok Widia Apriani; Lalu Japa; Didik Santoso
Jurnal Biologi Tropis Vol. 23 No. 1 (2023): Special Issue
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v23i1.5867

Abstract

Gili Trawangan is one of the popular marine tourism destinations and conservation areas in the West Nusa Tenggara Province. Increased human activity in the Gili Trawangan is associated with increased pressure on aquatic ecosystems. Human activity pressure comes from tourism activities and negative impacts due to various community activities around the waters can reduce water quality. Changes to water quality can be seen from the abundance and composition of phytoplankton. This is because phytoplankton plays an important role in a water body, namely as a primary producer in the food chain and has the ability to respond to the changes of the environment factors. This rearch was conducted to determine the abundance and composition of phytoplankton community structure in Gili Trawangan, North Lombok. Seawater samples were taken using a 20 µm plankton net by filtering 100 L of water. The filtered water samples were then preserved using formalin in 4% concentration. Data were analyzed by calculating the abundance of individuals, diversity (H'), uniformity (E), and dominance (D). The results showed that the average abundance of phytoplankton species was 1026.296 Ind/L and 22 genera of phytoplankton were identified. Species diiversity index (H'=2.58) is classified as medium. Species uniformity index (E=0.88) and species dominance index (C=0.10). Based on the results of this research it can be concluded that the waters of Gili Trawangan North Lombok are classified as oligotrophic waters.
Water Quality Assessment of Bagek Kembar Mangrove Ecosystem Using Phytoplankton as A Bioindicators Yoszi Setiawan; Lalu Japa; Prapti Sedijani
Jurnal Biologi Tropis Vol. 26 No. 1 (2026): Januari-Maret
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i1.11492

Abstract

Mangrove ecosystems are highly dependent on surrounding water quality, which can be effectively assessed using biological indicators such as phytoplankton communities. This study aimed to analyze the water quality of the Bagek Kembar Mangrove Essential Ecosystem, West Lombok, based on phytoplankton community. The research employed a descriptive exploratory design with purposive sampling at three mangrove ecosystem types: pond area, rehabilitated mangrove, and natural mangrove. Phytoplankton samples were collected using a plankton net and analyzed for abundance, species diversity, evenness, and dominance. Physical and chemical parameters including temperature, pH, and salinity were also  study fully identified 67 species of phytoplankton with a total abundance of 2,542.5 ind/L. Merismopedia elegans was a dominant species, particularly in the pond area. Diversity indices ranged from low to moderate, evenness valuew indicated relatively stable communities, and dominance indexs showed no species dominance. These results indicated that the waters of the Bagek Kembar mangrove ecosystem are generally in good condition with mild ecological pressure influenced by anthropogenic activities. This study provides baseline ecological data to support sustainable management and conservation strategies for mangrove essential ecosystems of Bagek kembar, West Lombok.
Seagrass Community Structure in the Coastal Waters of Pandanan Sekotong Barat, West Lombok Maulida Suryatni; Didik Santoso; Lalu Japa
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12746

Abstract

Seagrass ecosystems play a crucial role in marine environments, particularly in supporting coastal biodiversity and maintaining ecological balance. The coastal waters of Pandanan Beach are ecologically vital but potentially exposed to anthropogenic pressures such as boat mooring and local foraging ("madak") activities. This study aimed to identify the species composition and analyze the community structure, including density, diversity, dominance, and coverage of seagrass in coastal waters at Pandanan Beach. Data collection were conducted using a quadrate transect method across three distinct transects. The results showed that a total of 7 seagrass species were identified, namely Cymodocea rotundata, C. serrulata, Enhalus acoroides, Halodule pinifolia, Halophila decipiens, Syringodium isoetifolium, and Thalassia hemprichii. The overall community structure of the seagrass was relatively stable and healthy, characterized by a mean total density of 163 ind/m² and an average canopy coverage of 52.28%. The species diversity index (H' = 1.65) fell into moderate category, supported by a low dominance index (D = 0.22), indicating an even distribution of species across the habitat. These findings suggest that despite ongoing human activities, the seagrass ecosystem in the coastal waters at Pandanan Beach remains in a resilient and healthy condition.
Community Structure of Phytoplankton as Bioindicators of Water Quality in Kuwang Wae Coastal Waters, East Lombok, Indonesia Baiq Maria Ulfa; Karnan Karnan; Lalu Japa
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12848

Abstract

Phytoplankton play a crucial role as a primary producer in aquatic ecosystems and can be used as a bioindicator to assess water quality. Aquaculture activities in coastal areas have the potential to alter the phytoplankton community structure through changes in the physical, chemical, and biological characteristics of the aquatic environment. This study aimed to analyze the composition, abundance, community structure, and role of phytoplankton as a bioindicator of water quality in Kuwang Wae Coastal Waters, East Lombok Regency. A descriptive-exploratory method with purposive sampling was employed at three observation stations, namely the pond outlet, transition zone, and reference area. The observed parameters included species composition, abundance, diversity index, evenness index, dominance index, importance value, and water quality parameters. The reserch identified 72 species of phytoplankton belonging to five divisions: Chrysophyta, Dinophyta, Cyanophyta, Chlorophyta, and Euglenophyta. The species with the highest importance values were Gonyaulax spinifera, Bacteriastrum biconicum, Melosira sp., Chaetoceros brevis, and Bacteriastrum elongatum.  The average phytoplankton abundance was 1,614 ind/L, with variations among observation stations. The species diversity index ranged from 2.318 to 2.813, the species evenness index from 0.686 to 0.709, and the species dominance index from 0.130 to 0.174. Water quality of  Kuwang Wae Beach is still in relatively good, stable condition, and has not experienced significant ecological pressures. The results of this study are expected to provide baseline information for sustainable management, conservation, and monitoring of coastal water quality.
Vegetation Structure of Mangroves in Bagek Kembar, Sekotong, West Lombok Vivi Maulida Cahyani; Lalu Japa; Didik Santoso
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12902

Abstract

Mangrove ecosystems play a crucial role in maintaining the ecological balance of coastal environments by supporting biodiversity and protecting shorelines. This study aimed to identify the species composition and analyze the vegetation structure of mangroves in the Bagek Kembar area, Sekotong, West Lombok, Indonesia. The research was conducted in January - May 2026 using a descriptive-exploratory approach with purposive sampling. Vegetation data were collected from 9 quadrats using line transect and quadrat methods. Data were analyzed using the species diversity index (H′), species evenness index (E), species dominance index (D), and Important Value Index (IVI). A total of 306 individuals belonging to five mangrove species were recorded, namely Avicennia marina, Rhizophora apiculata, R. mucronata, R. stylosa, and Sonneratia alba. The species diversity index (H′) was 1.30, indicating moderate diversity, the species evenness index (E) was 0.80, indicating high evenness, and the species dominance index (D) was 0.30, indicating low dominance. Rhizophora mucronata showed the highest Importance Value Index of 115.86, indicating its dominant ecological role in the mangrove community. These findings indicate that the mangrove vegetation in the Bagek Kembar area is in relatively good condition and highlight the ecological importance of the dominant species as a priority for conservation and sustainable mangrove ecosystem management.  
Co-Authors Afiatul Hafifah Agil Al Idrus Ahmad Raksun Annisa Mujriati Arif Safrillah Baiq Diana Safitri Baiq Dini Najia Dzurrahmi Baiq Maria Ulfa Baiq Sri Handayani Baiq Sri Handayani Dhuha Alief Khanda Saefudin Didik Santoso Dita Anggraini Safitri Sipayung Eni Suyantri Gito Hadi Prayitno Harsa Naunik Qudraty Hilman Ahyadi I Gde Mertha I Gede Mertha Imam Bachtiar Intan Mushlihah Jamaluddin Jamaluddin Karnan Karnan Khairatun Nafisah Khairuddin Khairuddin Khusnul Hayatunnisa Laila Nurul Safitri Lalu Hasan Nasirudin Zohri Lalu Zulkifli Maulida Suryatni Mega Safitri Muchlis Muhamad Hairil Anas Nadia Audina Ni Putu Maitri Vidya Cita Riesky Noar Muda Satyawan Nurseha Nurseha Prapti Sedijani Prapti Sedijani Rachmawati Noviana Rahayu Rizky Regina Kawirian Suripto Suripto Syamsul Bahri Tasya Nurul Aulia Vivi Maulida Cahyani Widia Apriani Yoszi Setiawan Yuni Safrian Hadi