TROPHIC STATE CHARACTERISATION FOR MALAYSIAN LAKES (original) (raw)
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2018
Information on the relations between phytoplankton communities and the environment is limited for the man-made lakes in Malaysia. This paper presents the results of a study on the diversity and seasonal succession of phytoplankton in Seri Serdang Lake and Faculty of Engineering Lake conducted between November 2013 and February 2014. A total of 27 species from four phyla (Chlorophyta, Euglenophyta, Cyanobacteria, Bacillariophyta) and 33 species belonging to Cyanobacteria, Chlorophyta, Bacillariophyta, Euglenophyta and Dinophyta were identified from Seri Serdang Lake and the Faculty of Engineering Lake, respectively. Chlorophyta were most dominant in both lakes. Highest number of species recorded was Monoraphidium sp. in Seri Serdang Lake and Pediastrum tetras in Faculty of Engineering Lake. Seri Serdang Lake had lower phytoplankton density (20 cells ml–1 to 396 cells ml–1) as compared to the Faculty of Engineering Lake (250 cells ml–1 to 300 cells ml–1). Although the distance between...
Eutrophication Status of Lakes in Inner Hanoi and a Case Study of Cu Chinh Lake
Journal of The Faculty of Agriculture Kyushu University, 2021
Many lakes in inner Hanoi have been affected by eutrophication, which commonly leads to uncontrolled growth of algae, generation of cyanobacteria and toxic algae, increased water-treatment costs, and lake shallowing. This study presents an overview of the recent eutrophication status in Hanoi lakes and compares the lakes with Cu Chinh Lake based on a case study performed from April 2017 to March 2018. The eutrophication was mainly assessed by comparing the nutritional parameters (phosphorus and nitrogen) with values of poor nutrition and the concentration of algal biomass with concentrations found in hypereutrophic lakes. In addition, we investigated which nutrients contribute to limiting the growth of algae based on the total nitrogen/total phosphorus ratio, and we identified groups of algae that contained typical species in Cu Chinh Lake. The nutrient levels and algal biomass in many lakes were maintained between the eutrophic and hypereutrophic limits and underwent seasonal changes throughout the year. In Cu Chinh Lake, phosphorus is the predominant limiting nutrient for the development of algae. Thus, some typical algae genera, such as Microcystis, Anabaena of cyanobacteria, and Scenedesmus of green algae, are biological indicators of eutrophication in the lake.
Variation of water quality and phytoplankton along different zones of Aswan High Dam Reservoir
Egyptian Journal of Aquatic Biology and Fisheries
his study was carried out at Aswan High Dam Reservoir and focused on the spatial variation of water quality parameters and phytoplankton composition. Water samples were collected from eighteen sampling stations, where six stations for each of the different zones were selected to represent the lacustrine, transition and riverine zones of the reservoir during 2007 and 2008. The results of the environmental factors showed wide variations in their concentrations along the different zones of the reservoir. In this study, chlorophyll a concentration was lower in the lacustrine zone than in the riverine, although turbidity and secchi depth values were all optimal for light availability. This result was influenced by higher abundances in the reservoir phytoplankton assemblages where riverine conditions predominate, by species tolerant to turbulent conditions and typical high mineral turbidity. Calculation of the trophic state index showed that riverine and transition zones are classified as eutrophic, while lacustrine zone is mesotrophic. Phytoplankton composition recorded thirty nine species belonging to Chlorophyceae (19 species), Cyanophyceae (10 species), Bacillariophyceae (7 species), and rare groups including Dinophyceae (2 species) and Eugelnophceae (1 species). Cyanophyceae were the most encountered group in the lacustrine and transition zones, while Bacillariophyceae were most encountered group in the riverine zone. This is due to that Cyanophyceae prefer the steady, transparent and low nutrients water (lacustrine), while Bacillariophyceae prefer flowing, turbid and nutrient-rich water (riverine). Statistical analysis showed that certain environmental factors do affect the phytoplankton growth. The results of the one-way ANOVA revealed that the different environmental factors (DO, water temperature, secchi depth, water velocity, turbidity, nitrate, phosphorus, magnesium, total dissolved solids, and trophic state index) and biotic factors (such as chlorophyll a and phytoplankton groups) were significantly different at the three zones of Aswan High Dam Reservoir (p<0.05). This result supports the speculation of variation in water quality and phytoplankton along the different zones of the reservoir.
Lakes & Reservoirs: Research & Management, 2008
Periphytic algal assemblages, comprising bacillariophytes, cyanophytes and chlorophytes of standing dead trees in Lake Kenyir, a tropical drowned forest reservoir, were studied during 1995. A total of 317 algal taxa were identified in this study. The monthly floral mean species richness and cell count data demonstrated significant temporal differences between the months, in one-way ANOVA (P < 0.05). Both redundancy analysis and cluster analysis on monthly blue-green abundance and diatom assemblages exhibited conspicuous groupings among the months, with underpinning seasonal differences. The responses were not similar, however, between the upstream and downstream ends of the lake. The grouping or clustering of months can be generalized as: (i) November, December and January as the monsoonal months; (ii) February, March, April and May as the transitional months; and (iii) June to October as the dry months. Based on stepwise multiple regression with forward selection, alkalinity and dissolved oxygen concentration were significant environmental predictors at the downstream dam sampling site, and reactive silica, electrical conductivity, Secchi depth transparency and sunshine hours were significant predicators at the upstream riverine sampling site, based on Monte Carlo tests. Being a ploymictic, mesotrophic lake, the limnology and temporal changes for Lake Kenyir appears to be complex and driven by monsoons, as evidenced from the temporal changes in its periphytic algae communities, particularly the diatom assemblages. The downstream sampling site (site 1) at the dam, in the main basin and deeper zone of the lake, the seasonal amplitude was likely complex because of thermocline formation and stratification processes. In contrast, the upstream sampling site in the Petang River (site 2) exhibited a clearer distinction between the dry and monsoon months, based on its cyanophyte and diatom floral assemblages. These study results are pertinent for lake management, especially for developing biomonitoring programmes or lake productivity studies, as well as for climate change studies, within the context of tropical lake ecology.
Spatial and Temporal Variations of Water Quality and Trophic Status in Sembrong Reservoir, Johor
E3S web of conferences, 2018
A study of spatial and temporal variations on water quality and trophic status was conducted to determine the temporal (average reading by month) and spatial variations of water quality in Sembrong reservoir and to evaluate the trophic status of the reservoir. Water samples were collected once a month from November 2016 to June 2017 in seventeen (17) sampling stations at Sembrong Reservoir. Results obtained on the concentration of dissolved oxygen (DO), water temperature, pH and secchi depth had no significant differences compared to Total Phosphorus (TP) and chlorophyll-a. The water level has significantly decreased the value of the water temperature, pH and TP. The water quality of Sembrong reservoir is classified in Class II which is suitable for recreational uses and required conventional treatment while TSI indicates that sembrong reservoir was in lower boundary of classical eutrophic (TSI > 50).
Plankton community characteristics of natural and man-made tropical lakes
Journal of Environmental Biology
Plankton community assemblages in both natural and man-made lakes are greatly influenced by the environmental variations, which in turn are dependent on the lake morphometric characteristics, edaphic conditions, climatic changes and the surrounding anthropogenic activities. The main objective of the present study was to investigate the pattern of phytoplankton and zooplankton composition and density, and their relationship with the water chemistry in three different lakes of Malaysia. Water quality, p h y t o p l a n k t o n a n d zooplankton abundance were measured in a natural lake and two reservoirs in Malaysia. Multivariate and univariate analyses were performed to compare the differences in community assemblages between a natural lake and a reservoir of same depth, and a shallow and a deep reservoir.-Marked lake variations were observed in the phytoplankton density. Dominant phytoplankton groups were Cryptophyta and Bacillariophyta in the shallow Bera Lake, Chlorophyta in the s h a l l o w B u k i t M e r a h Reservoir and Euglenophyta and Chlorophyta in the deeper Durian Tunggal reservoir. Both man-made lakes had significantly higher (P < 0.05) plankton densities compared to the natural lake. The shallower Bukit Merah Reservoir had higher phytoplankton density compared to the deeper Durian Tunggal Reservoir. Dissolved oxygen and pH levels were correlated to the phytoplankton and zooplankton communities in the Bera floodplain, whilst nutrient and chlorophyll-a concentrations were important factors affecting the phytoplankton and zooplankton assemblages, respectively,in the Durian Tunggal and Bukit Merah reservoirs. Plankton community in shallow tropical lakes have different characteristics and composition compared to the deeper ones, and thus requiring different management measures.
6th International Conference on Advances in Engineering Sciences and Applied Mathematics (ICAESAM-2016) Dec. 21-22, 2016 Kuala Lumpur (Malaysia), 2016
Lakes has potential as a carbon sink in the waters. Primary productivity is the rate of formation of organism compound from the energy rich inorganic compounds. This study is about the level of carbon uptake and chlorophyll content on phytoplankton, is aims to analyze the level of carbon uptake study was conducted in six lakes Campus University of Indonesia Depok, namely Kenanga, Agathis, Mahoni, Puspa, Ulin and Salam. Sampling was conducted in September-October 2015. The dark-light bottle method used to measure the primary productivity in the waters. Bottle of darks and light was placed at a dept of 0 cm, 10 cm, 30 cm, 50 cm and 70 cm. Sampling of phytoplankton was conducted using a plankton net. Measurement of chlorophyll-a, chlorophyll-b and chlorophyll-c using a spectrophotometer with a wavelength of 750, 664, 647 and 630 nm. The rate of carbon uptake in six lakes Campus University of Indonesia Depok it has potential to absorb carbon average between 0.442-0.879 mgC/m 3 /hour. The content of chlorophyll-a, chlorophyll-b and chlorophyll-c, largest average in a row is obtained in Agathis Lake is 0.135 mg/l, Kenanga Lake is 0.095 mg/l and Kenanga Lake is 0.116 mg/l. The smallest average in a row is Kenanga lake is 0.012 mg/l, Puspa 0.016 lake is mg/l and Agathis lake 0.003 mg/l. The results of the identification of phytoplankton samples obtained in class Chlorophyta, Cyanobacteria and Bacillariophyta (Diatom)
Water Quality Assessment and Eutrophic Classification of Hanoi Lakes Using Different Indices
Vietnam Journal of Agricultural Sciences, 2021
The trophic levels in urban lakes are typically based on the forms of nutrition and phytoplankton communities in the lakes. In this study, comparisons between eutrophication indices and the water quality index (VN-WQI) were used to classify the water quality of 20 lakes in Hanoi, Vietnam. The results showed that the water quality ranged from very bad to poor. High levels of the eutrophication phenomenon in terms of total N and P were observed in all sampling sites. Cyanobacteria was the dominate algae phylum making up 65.78% of the total population, whereas Chlorophyta (including 19 genera) was the most diverse phylum. The density of the algae was 5,000-14,000 cells mL-1 and the chlorophyll-a level was 10-40 µg L-1. Based on this information, the water quality levels in the lakes were classified from eutrophic to polytrophic. The Trophic Status Index (TSI) and Trophic Level Index (TLI) values were 66.9-86.0 and 54.4-76.0 points, respectively, corresponding from eutrophic to extrem...
Seasonal variation of phytoplankton in Tuyen Lam reservoir in Da Lat, Vietnam
TAP CHI SINH HOC, 2016
Seasonal variation and phytoplankton dynamics in Tuyen Lam reservoir in Da Lat city, Viet Nam were studied in the rainy and dry seasons (during January through December, 2014). Samples were taken monthly from 3 stations of Tuyen Lam reservoir. The aim of this study was to analyze the structure of the phytoplankton community on seasonal scales and to identify the environmental factors, such as temperature, conductivity, pH, dissolved oxygen, light intensity, transparency, ammonium, nitrate and phosphate controlling the phytoplankton density and composition of phytoplankton communities. The results showed that phytoplankton comprised 43 taxa, mainly Chlorophyta (58%), Bacillariophyta (14%), Cyanobacteria (14%), Dinophyta (7%), Chrysophyta (5%) and Euglenophyta (2%). There was significant difference in phytoplankton abundance but not species richness between two seasons. Multiple regression analysis between chlorophyll a contents, phytoplankton density with environmental independent variables indicated that ammonium, nitrate concentrations and water temperature were significantly impact to the abundance of phytoplankton, while almost no independent variables were found to correlate to chlorophyll a. CCA analysis phytoplankton and abiotic parameters revealed several species groups with their favorable environmental conditions.