Abstract
The study aimed to evaluate water quality at Bung Binh Thien Reservoir, in An Giang Province, Viet Nam using Shannon-Wiener species diversity index (H’) and associated average score per taxon (ASPT) calculated from composition of phytoplankton and zoobenthos. The water quality index (WQI) was used as the reference forthe quality of surface water. The samples of surface water quality, phytoplankton, and zoobenthos were simultaneously collected at 11 sites during the dry season. The results showed that WQI (57-88) classified waterquality from good to medium, H’ calculated using phytoplankton species (1.12-2.71) presented water quality from medium to bad where as, H’z calculated (0 to 2.07) and ASPT (2-4.21) calculated from zoobenthos species divided water quality from bad to very bad. The findings revealed that assessing water quality should not totally rely on diversity indices (H’, ASPT), but compositions of phytoplankton and zooplankton should also be taken into consideration.
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