Biological Environment and Pollution

Identification of microalgae in peat swamp waters

Faridah Tsuraya, M Sadam Rahmansyah, Fauzan Fikri, Rizka Hasanah — Sat, 30 Dec 2023 00:00:00 +0700

Microalgae are a group of autotrophic microorganisms that can live in freshwater and marine ecosystems. Microalgae in peat swamp waters are important to investigate and identify because they are used as aquatic bioindicators and have various potency and applications. This study aims to identify microalgae in peat swamp water in the Universitas Palangka Raya area, Central Kalimantan. This research used a purposive sampling method with two stations. The abiotic factors observed were temperature, dissolved oxygen, water transparency, and pH. Microalgae found were 12 genera (Behind the FMIPA UPR Building) and 6 genera (Jalan B Koetin). Some of the microalgae included Closterium, Micrasterias, Chlorella, Botryococcus, Cosmarium, Euastrum, Pleurotaenium, Chroococcus, Chlorogonium, Euglena, Selenastrum, Zygnema, Anabaena, Thalassionema, Pinnularia, Staunrastrum, and Gonatozygon. Some of them have morphological characteristics and potential in various fields. The abiotic factors in this research showed the normal temperature (29.5 ⁰C and 27 ⁰C), quite low for DO (2.9 mg/L and 4.7 mg/L), low brightness (23.25 and 25 cm), and acidic pH (4). Abiotic factors indicate that the condition of peat swamp water is a reasonably extreme ecosystem but is still suitable for the life of several species of microalgae.

Morphological character analysis of Rasbora borneensis

Sat, 30 Dec 2023 00:00:00 +0700

Rasbora borneensis is a local fish of West Kalimantan that has the potential to be developed as farmed fish and biomedical research model animals. The utilization of fish potential as aquaculture animals and biomedical research model animals requires data on the biological aspects of these fish. Data from Fish Base (2023) shows that until now the biological information of Rasbora borneensis is still very limited, both morphological, anatomical, and reproductive data. This study aims to analyze the morphological characters of Rasbora borneensis. The results of this study show that there are morphological differences between male and female Rasbora borneensis fish. Female fish show a rounded flat body shape, while male fish show a flat body shape. The measurement results show that the morphometric ratio of male and female fish is different. However, when viewed based on variations in the size of the specimens used, there are several sizes that have the same value.

Biological indicators of aquatic health: Evaluating water quality in Krueng Baru River

Sat, 30 Dec 2023 00:00:00 +0700

The purpose of this study was to determine the quality of water contained in the Krueng Baru River area, South Aceh Regency, and to determine the effect of iron metal (Fe) pollution on the structure of snail shells found in the Krueng Baru River area, South Aceh Regency. This research was conducted on February 20/March 2021. Research sampling in the Krueng Baru River, South Aceh Regency. Ferrous heavy metals (Fe) were analyzed at the Chemistry Laboratory and Biological Laboratory of Syiah Kuala University. The research site contained research samples of suction snails (Cerithidea obtusa). The sampling technique uses a purposive sampling technique. The data processing method used in the research is the descriptive method. Based on the results of research that have been done, Fe heavy metal levels in water and biological indicators of Cerithidea obtusa at station I 1,264 ppm, station III 2,323 ppm, and most obtained at station II with an average amount of Fe levels reaching 2,592 ppm. Based on the results of the analysis, in terms of the biological indicators of the sucker Cerithidea obtusa, it shows that there are differences in water quality at Station I, Station II and Station III. Conclusions based on the results of research on water quality in the Krueng Baru River show the content of heavy metal compounds (Fe) in the river, which means the area is polluted with Fe.