![Sample our Environment & Agriculture journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5934/TOC-Subject-Sample-2021-Environment-Agriculture.jpg"})
ABSTRACT
Data for transparency, total phosphorus, total inorganic nitrogen, and chlorophyll a were examined to describe the current trophic status of Tsengwen Reservoir using Carlson's trophic state index (TSI) and to analyze how that status has changed over the last 16 years. The TSI decreased after 1993 and had relatively higher values during the rainy season than during the dry season. In terms of species abundance and richness, Chorophyceae dominated the phytoplankton, while Cyanophyceae and Bacillariophyceae were also numerically important. Since 2002, cyanotoxin-producing species (Microcystis aeruginosa and Oscillatoria tenius) have occurred in abundance in Tsengwen Reservoir.