STRUKTUR KOMUNITAS DAN KELIMPAHAN MIKROALGA SEBAGAI BIOINDIKATOR KUALITAS PERAIRAN DI PELABUHAN SUNGAI DUKU PEKANBARU
DOI:
https://doi.org/10.26418/edunaturalia.v6i2.97993Abstract
Port waters often face ecological pressures from shipping, industry, and settlements that can affect environmental quality. This study aims to analyze the community structure, abundance, and role of microalgae as bioindicators of water quality in the Duku River Port, Pekanbaru. This location was chosen because of its potential for quality decline due to anthropogenic activities. Sampling was conducted at three stations using survey methods and purposive sampling techniques. The results showed that microalgae abundance ranged from 1,020 to 2,150 ind/L, which is classified as moderate. The low dominance index (<0.5) indicates that no species dominates, resulting in a balanced community structure. The diversity index ranged from 2.59 to 2.76, indicating moderate ecological pressure. Thirty-three species from seven divisions were found, with Bacillariophyta as the most dominant division. The species Melosira sp. and Closterium praelongum were identified as bioindicators due to their high abundance. Measurements of physical and chemical parameters showed acidic pH conditions (pH 6) and varying BOD values, indicating pollution. Overall, the water is still capable of supporting microalgae life, but further monitoring is needed to address the decline in water quality.References
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