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All Journal Bioscientist : Jurnal Ilmiah Biologi
Bustamin
Universitas Tadulako
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology Social Sciences

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Community Structure of Fiddler Crabs (Uca) in the Mangrove Ecosystem of Lalombi Village, South Banawa District, Donggala Regency Berlinda Austin Paliwan; Bustamin; Abd. Rauf; Syech Zainal; Moh Sabran; Raya Agni
Bioscientist : Jurnal Ilmiah Biologi Vol. 14 No. 1 (2026): March
Publisher : Department of Biology Education, FSTT, Mandalika University of Education, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/bioscientist.v14i1.19867

Abstract

This study aimed to analyze the community structure of fiddler crabs (Uca) in the mangrove ecosystem of Lalombi Village, South Banawa District, Donggala Regency, and to utilize the research findings as instructional media in the form of a flipbook. This ecological study employed a quantitative descriptive approach based on community structure analysis, with samples collected using purposive sampling. The parameters analyzed included species composition, density, the Shannon–Wiener diversity index, the Simpson dominance index, and the evenness index, along with environmental variables such as temperature, salinity, pH, and substrate type. The results showed that the fiddler crab community in the mangrove ecosystem of Lalombi Village consisted of five species, namely Uca annulipes, Uca lactea, Uca forcipata, Uca tetragonon, and Uca dussumieri. Abundance varied across sampling stations, and the overall diversity level was classified as low to moderate. The occurrence frequency of these five fiddler crab species was very low. The recorded densities were 6 ind/m² for Uca annulipes, 3 ind/m² for Uca lactea, 5 ind/m² for Uca forcipata, 7 ind/m² for Uca tetragonon, and 3 ind/m² for Uca dussumieri, with a low dominance index. The environmental physicochemical conditions recorded for fiddler crab habitat were a temperature of 30°C, water pH of 8.25, salinity of 31, and a muddy substrate type. Overall, the fiddler crab community structure in the mangrove ecosystem of Lalombi Village was relatively stable, characterized by low to moderate diversity, low dominance, and a clumped distribution pattern influenced by substrate conditions and mangrove density.
Types and Abundance of Microplastics in African Catfish (Clarias gariepinus) from Sumber Agung Village, Parigi Moutong Mudrikah Tus Sa'diah; Fatmah Dhafir; Masrianih; Sutrisnawati; Bustamin; Rafiqa
Bioscientist : Jurnal Ilmiah Biologi Vol. 14 No. 2 (2026): June
Publisher : Department of Biology Education, FSTT, Mandalika University of Education, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/bioscientist.v14i2.20493

Abstract

This study aimed to determine the types and abundance of microplastics in African catfish (Clarias gariepinus) collected from aquaculture ponds and a river in Sumber Agung Village. A descriptive research design was employed using both qualitative and quantitative approaches. A total of 10 catfish aged approximately two months were used as samples, consisting of five individuals from aquaculture ponds and five individuals from the river. Digestive tract samples were digested using 10% KOH solution for 96 hours to separate microplastic particles, followed by filtration, identification, and particle counting. The results showed that microplastics were detected in all catfish samples. Three types of microplastics were identified: fibers, films, and fragments. The abundance of microplastics in catfish from aquaculture ponds was 103.6 particles/individual, which was higher than that observed in catfish from the river, at 57.6 particles/individual. Fragments were the dominant microplastic type in pond-derived catfish, whereas fibers predominated in river-derived catfish. Differences in microplastic abundance were influenced by the characteristics of the aquatic environment, with ponds having limited water circulation that may facilitate microplastic accumulation. These findings indicate that catfish have the potential to serve as bioindicators of microplastic pollution in both aquaculture systems and natural freshwater environments. However, microplastic identification in this study was based solely on microscopic observation; therefore, the polymer composition of the detected microplastics could not be confirmed.
Effect of the Think Talk Write Cooperative Learning Model Assisted by Poster Media on Students’ Learning Outcomes in Biology Among Grade VIII Students at SMP Negeri 19 Palu Nuraziza Z Al Hadar; Astija; Moh. Sabran; Bustamin; Isnainar; Mursito S. Bialangi
Bioscientist : Jurnal Ilmiah Biologi Vol. 14 No. 2 (2026): June
Publisher : Department of Biology Education, FSTT, Mandalika University of Education, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/bioscientist.v14i2.20718

Abstract

This study aimed to examine the effect of a poster-assisted Think Talk Write cooperative learning model on eighth-grade students’ learning outcomes in biology at SMP Negeri 19 Palu. A quasi-experimental method was employed using a nonequivalent control group design. The study involved two classes selected through purposive sampling: Class VIII A, consisting of 31 students, served as the control group, while Class VIII C, consisting of 28 students, served as the experimental group. Data were collected using a multiple-choice achievement test. The findings showed that the poster-assisted Think Talk Write cooperative learning model had a significant effect on students’ learning outcomes in the topic of the excretory system. The Mann–Whitney U test comparing the posttest scores of the experimental and control groups yielded an Asymp. Sig. (two-tailed) value of 0.001, which was lower than the significance level of 0.05. This result indicated a statistically significant difference between the two groups after the intervention. Furthermore, the experimental group achieved a mean normalized gain of 73% (g = 0.73), which was higher than that of the control group, which achieved 55% (g = 0.55). These findings demonstrate that the poster-assisted Think Talk Write learning model significantly improves students’ biology learning outcomes. Therefore, this model may be considered an effective alternative instructional strategy for enhancing student achievement.
Co-Authors Abd. Rauf Astija Berlinda Austin Paliwan Fatmah Dhafir Isnainar Masrianih Mudrikah Tus Sa'diah Mursito S. Bialangi Nuraziza Z Al Hadar Rafiqa Raya Agni Sutrisnawati Mardin Syech Zainal