Water quality of tropical reservoir based on spatio-temporal variation in phytoplankton composition and physico-chemical analysis

Abstract

This study assessed the water quality of Mengkuang Reservoir, Penang, Malaysia, by its trophic status according to a Carlson Modified Trophic Index (CMTSI) and by its biological parameters using Shannon-Wiener diversity index (H 0 ) and saprobic index. The study conducted from August 2005 to July 2006 showed that mean values of CMTSI (nutrients), CMTSI (chlorophyll a) and CMTSI (Secchi depth) were 27.18 ± 8.73, 40.63 ± 7.12 and 41.74 ± 6.38, respectively. The mean values of CMTSI indicated that the reservoir was oligotrophic. Mean value of H 0 was 2.15 bits/individual, showing that the water quality based on H 0 value was in class III (slightly polluted). Saprobic index value (2.24) also revealed that the reservoir was moderately polluted (class II). The occurrence of Anabaena, Microcystis, Oscillatoria, Nostoc, Dinobryon, Chroococcus, Staurastrum paradoxum and Mallomonas which are indicators of toxic and polluted waters was also recorded. This study therefore showed the importance of phytoplankton composition and community structure as a reliable and important tool to assess the degree of pollution in Mengkuang Reservoir. Long-term assessments of biological and chemical parameters in the reservoir are necessary, and phytoplankton community structure as bioindicator provides unique information about the ecosystem. This information is potentially useful as an early warning sign of deteriorating condition and thus gives insight into the overall ecology of lakes and will assist in the future conservation and management of this lentic ecosystem.

Temporal and Spatial Study of Water Quality and Trophic Evaluation of a Large Tropical Reservoir

“…Hence, the total phosphorus was the parameter that showed the least influence in trophic status calculation. These results were very similar to those reported by Mazhan and Makhlougl [22] and Vidović et al [2]. Similar results have also been published by Quevedo-Castro et al [48].…”

“…Several authors have introduced different criteria for the classification of freshwater trophic levels; most of them have been based on phosphorus (P), nitrogen (N) compounds, and chlorophyll-a concentrations [21][22][23][24]. In this study, the mean values of chlorophyll-a, total phosphorus, total nitrogen, and Secchi disk depth (SD) were used for calculating the Carlson Modified Trophic State Index (CMTSI) [22,[25][26][27]. Water quality classification based on the CMTSI was adapted from Begliutti et al [28] and Molisani et al [23].…”

“…The trophic status assesses water body changes by simplifying complex environmental variables. Maznah and Makhlough [22] suggested a trophic state index which also includes chlorophyll-a. This index has been found to be reliable for quantifying the trophic state in tropical water bodies [46,47].…”

Epipelic cyanobacterial diversity in Pinang River basin, Malaysia, revealed by 16S-based metagenomic approach

“…5). Це суперечить загальним припущенням, що кількість видів та різноманітність зменшуються відповідно до погіршення умов якості води (Offem et al, 2011;Wan Maznah, Makhlough, 2015). Використання видового різноманіття для оцінки якості води є складним (Podani, 1992;Wan Maznah, Mansor, 2002).…”

Study of phytoplankton flora and its use as a biomonitoring tool to determine the water quality of Krishnasayar Lake, Burdwan, West Bengal, India

“…(2011, phytoplankton composition; biovolume; flushing rate; ecological water quality), Ghosh et al. (2012; phytoplankton composition; diversity indices), Barinova and Krassilov (2012; River Pollution Index; Water Ecosystem State Index); Khatri and Tyagi (2015; effects of nature and manmade activities on aquatic systems), Wan Maznah and Makhlough (2015; trophic status by Shannon–Wiener diversity index and Saprobic index), Bhadrecha et al. (2016; biological indices calculated for benthic micro‐invertebrates), Khatri et al.…”