Eight Phyla of phytoplankton, which consisted of
16 Orders, 19 Families 23, Genera 28 Species, were
found in the King Rama IX Royal Park Reservoir.
These species are commonly found in still water
throughout Thailand. The seasonal distribution,
diversity index and trophic levels were all found
to be low in August (rainy season). In addition, the
some dominant species were indicative of highnutrient
content and toxin production. Therefore,
the distribution of phytoplankton and the nutrient
levels in the water should be assessed regularly for
effective Eutrophication monitoring.