Influence of rainfall, air temperature, physical and chemical water profiles on Cyanobacteria Biovolume in Slim River lake, Perak, Peninsular Malaysia
<p>This study aimed to identify the influence of rainfall, air temperature, physical and</p><p>chemical water profiles on cyanobacteria biovolume in Slim River Lake, Perak,</p><p>Peninsular Malaysia. Water samples were collected t...
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| Format: | thesis |
| Language: | eng |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://ir.upsi.edu.my/detailsg.php?det=9663 |
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| Summary: | <p>This study aimed to identify the influence of rainfall, air temperature, physical and</p><p>chemical water profiles on cyanobacteria biovolume in Slim River Lake, Perak,</p><p>Peninsular Malaysia. Water samples were collected twice per month for 12 months in five</p><p>sampling stations (S1-S5) to represent the lakes overall condition. Samplings were</p><p>consistently conducted at the same time in the morning to reduce the influence of</p><p>surrounding air temperature variations. The physical, chemical, and biological parameters</p><p>were analysed according to American Public Health Association (APHA) standard</p><p>methods. Rainfall and air temperature data were obtained from the Malaysian</p><p>Meteorological Department. Data were successfully collected and the results indicated</p><p>that Slim River Lake's physical, chemical, and biological water profiles were highly</p><p>variable on a temporal scale. Total phosphorus, total nitrogen, chemical oxygen demand,</p><p>chlorophyll-a and biovolumes of Microcystis spp. were recorded as 0.20-1.96 mg/L, 1.0-</p><p>4.2 mg/L, 9.50-82.0 mg/L, 2.08-132.05 g/L, 6.13106- 1.65108 m3 /mL, respectively.</p><p>These parameters were recorded at levels exceeding the recommended limit values by</p><p>National Lake Water Quality Criteria and Standards (NLWQS). Temporal fluctuations in</p><p>physical, chemical, and biological profiles cannot be generalized into similar patterns.</p><p>Rainfall and air temperature ranged as 36.3-642.5mm and 30.71-35.0oC, respectively.</p><p>Rainfall and air temperature explained up to 72.3% and 77.3% variation in lake water</p><p>quality. Multivariate Principal Component Analysis (PCA) suggested that 71.5% of</p><p>chlorophyll-a variation and 70.2% of Microcystis spp. biovolumes variation can be</p><p>explained by changes in rainfall, air temperature, physical and chemical water parameters.</p><p>In conclusion, this study successfully showed that the physical, chemical and biological</p><p>profiles in the Slim River Lake are variable and influenced by the variability of local</p><p>rainfall and air temperature. Moreover, parameters included in the PCA analysis can</p><p>largely explain temporal changes of cyanobacteria biovolume. In implication, the study</p><p>outputs are useful for lake quality assessment and rehabilitation strategy formulation to</p><p>mitigate the impact of changes in physical, chemical and biological profiles.</p> |
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