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All Journal Jurnal Riset Teknologi Pencegahan Pencemaran Industri JURNAL BIOLOGI PAPUA
Daawia Daawia
Cenderawasih University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Materials Science & Nanotechnology

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Biology and life cycle of Euploea netscheri Snellen, 1889 (Lepidoptera: Danainae) on Hoya host plants (Apocynaceae) Daawia Daawia; I Made Budi; Bambang Suhartawan
Jurnal Biologi Papua Vol 18 No 1 (2026)
Publisher : Jurusan Biologi FMIPA Universitas Cenderawasih

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31957/jbp.4238

Abstract

Biological observations and life cycle studies of Euploea netscheri Snellen, 1899 on Hoya species were conducted at Yadikap Garden, Arso 2, Keerom, Papua, Indonesia, from June to August 2024.  Eggs laid by female butterflies on Hoya leaves were observed to record hatching time and the duration of the egg stage. Additionally, the total number of larval instars, the duration of each instar, and the duration of the pupal stage until emergence of the imago were documented. Measurements of the length of eggs, larvae, pupae, and adult butterflies were carried out using a caliper. The behavior and morphological characteristics of each larval instar, as well as those of the pupae and adults, were observed and recorded. Female E. netscheri butterflies were found to lay eggs on the leaves of Hoya globulifera and H. pachiphylla. The species completed its life cycle in approximately 22–25 days, consisting of an egg stage of about 3 days, a larval stage of 12–14 days, a pre-pupal stage of 1 day, and a pupal stage lasting 6–7 days. The results of this study provide the first record of the distribution, biology, and life cycle of E. netscheri in Keerom, Papua. New information is also presented regarding its larval host plants, namely H. globulifera and H. pachiphylla.
Development and Validation of the Rational Water Quality Index (RWQI): A Health Risk-Based Dynamic Weighting Framework for Water Quality Evaluation of Lake Sentani, Papua Bambang Suhartawan; Daawia Daawia
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 17 No. 1 (2026): May
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2026.v17.no1.p175-183

Abstract

Lake Sentani is the largest lake in Papua and an important raw water source facing pressure from residential expansion, agricultural runoff, domestic wastewater, and small-scale mining. This study developed and internally evaluated the Rational Water Quality Index (RWQI), integrating the Regulatory Violation Index (RVI), Toxicological Severity Score (TSS), and Limnochemical Similarity Coefficient (LSC). Data were collected from 45 sampling points across four limnological zones over three seasonal periods. The first-season dataset (n = 45) was used to develop the PCA-based LSC structure, while the subsequent two seasons (n = 90) assessed its temporal stability without recalibration. Overall performance was evaluated using classification accuracy, ROC/AUC, structural coherence, and consistency with trophic conditions. RWQI achieved 91.56% classification accuracy, AUC = 0.980, and R² = 0.989, outperforming SWQI, OWQI, and the Pollution Index. Spatial analysis identified the Harapan and Flafow River littoral zones as priority areas (RWQI 38.2–43.7, Poor), while the pelagic center maintained Good quality (RWQI 84.2). RWQI shows potential as an adaptive framework for tropical lake assessment, but independent external validation remains necessary before broader standardization.
Co-Authors Bambang Suhartawan Bambang Suhartawan I Made Budi