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All Journal BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) Jurnal Biologi Tropis
Fudianto, Achmad
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Preferences of Javan Langurs (Trachypithecus auratus) for Food Trees as a Foraging Behavior Marker in the Coban Pelangi Area, Malang Regency Fudianto, Achmad; Rohman, Fatchur
Jurnal Biologi Tropis Vol. 25 No. 4b (2025): 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.v25i4b.10453

Abstract

The Javan lutung (Trachypitecus auratus) is known as one of the endemic primates of Java, Bali, and Lombok, whose existence is classified as vulnerable. Anthropogenic practices such as illegal wildlife trade, hunting, and habitat reduction stimulate changes in habitat use decisions, foraging strategies, and restrictions on daily activities. The objectives of the study include: (1) analyzing the vegetation that constitutes the Javan langur's diet, (2) identifying the Javan langur's preferences for food trees as indicators of foraging behavior, and (3) analyzing the daily feeding behavior of Javanese langurs in the Coban Pelangi area. The results of the research show that there are 15 plant species from 6 families with the highest INP found in Calliandra calothyrsus with a value of  87.22%, while there are 5 types of plants that serve as food sources, with Phyllantus reticulatus being the highest preference at 6,15 (w>1), Ficus sp. 3, Ficus kurzii, Calliandra calothyrsus, and Dendrocnide stimulans. The feeding behavior of the Javan langur as a daily activity is carried out by grabbing leaf stalks with their hands, stripping them, and then eating the young leaves for 2-5 minutes while sitting.
GILLS VISUALIZATION OF TILAPIA AND MORTALITY RATES USING THE LETHAL 50 METHOD TO DETECT SUBLETHAL OIL POLLUTION IN RIVER WATER BODIES Susanto, Alifah Mutiara; Fudianto, Achmad; Cornelius, Anastasya Nabila; Siwi Budi M, Zelbia Redina; Daniarsih, Ajeng
BIOLINK (Jurnal Biologi Lingkungan Industri Kesehatan) Vol. 12 No. 2 (2026): Biolink February
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/biolink.v12i2.16461

Abstract

Environmental issues in Indonesia are mostly caused from pollution resulting from industry and domestic waste. Oil and used cooking oil are examples of waste that are often produced from both. Water contaminated by these chemicals can affect organisms living in it, one of which is tilapia (Oreochromis niloticus). Hazardous chemicals can accumulate in tilapia through the food chain, absorption through the gills, or diffusion through the skin surface, potentially causing death. This study aims to determine the effect of used cooking oil and motor oil waste on gill morphology and mortality of tilapia. The study was conducted for 96 hours using an experimental method by testing the effect of used cooking oil and used oil with concentrations of 1%, 3%, 5% on tilapia (O. niloticus). The parameters observed in the study were gill morphology and calculating the number of fish mortalities. The results show that increased concentrations of used cooking oil and motor oil increased tilapia mortality, with the highest mortality at a concentration of 5%, indicating that exposure had exceeded the sublethal threshold and was lethal.
Co-Authors Ajeng Daniarsih Cornelius, Anastasya Nabila Fatchur Rohman Siwi Budi M, Zelbia Redina Susanto, Alifah Mutiara