Spatial and temporal variations of two cyanobacteria in the mesotrophic Miyun reservoir, China

Abstract

a b s t r a c tSpatial variations in phytoplankton community within a large mesotrophic reservoir (Miyun reservoir, North China) were investigated in relation to variations in physico-chemical properties, nutrient concentrations, temperature and light conditions over a 5 month period in 2009. The dynamics of phytoplankton community was represented by the dominance of cyanobacteria through summer and fall, following with a short term dominance of chlorophyta in late fall, and a relatively high abundance of diatom in October; on the other hand, maximum phytoplankton biomass was recorded in the north shallow region of Miyun reservoir with a higher nutrients level. Particular attention was paid to the impacts of environmental conditions on the growth of two cyanobacteria genera, the toxin-producing Microcystis and the taste & odor-producing Oscillatoria. Microcystis biomass was in general greatly affected by water temperature and mixing depth/local water depth ratio in this reservoir, while the Oscillatoria biomass in the surface and middle layers was greatly affected by total dissolved phosphorus, and that in the bottom layer was related with the Secchi depth/local water depth ratio. Abundant Oscillatoria biomass was observed only in late September when Microcystis biomass decreased and allowed sufficient light go through.

Discordant Temporal Turnovers of Sediment Bacterial and Eukaryotic Communities in Response to Dredging: Nonresilience and Functional Changes

“…The results further proved that oxygen was a key driver of protist community structure (19), which creates an apparent phylogenetic dichotomy between oxic and anoxic assemblages (29)(30)(31). In addition, pH and seasonal temperature variation were important factors influencing sediment community structure (32). CCA results further indicated that the main controlling factors were DO, pH, E h , and the seasonal variations in temperature in this study (Fig.…”

Dynamics of Bacterial Community Diversity and Structure in the Terminal Reservoir of the South-To-North Water Diversion Project in China

“…The water security has received more attention in recent years. To date, only few studies have investigated the water quality and phytoplankton communities in Miyun Reservoir [8], but information about the bacterial community is still lacking. It is important to consider the diversity and structure of the microbial community within a drinking water reservoir when assessing ecosystem functions and human health [9].…”

MIB-producing cyanobacteria (Planktothrix sp.) in a drinking water reservoir: Distribution and odor producing potential

“…A hypothesis is that the blooming of the algae producing the MIB is due to a continuous decrease of water level since 1999 (Gao et al, 2013). A preceding study (Su et al, 2014) revealed that the MIB-producing Planktothrix (then named as Oscillatoria) bloomed when the density of Microcystis cells decreased significantly, allowing sufficient light to penetrate to the sediment surface. In this study, variations of algal densities and MIB concentrations in different regions of Miyun Reservoir have been continuously monitored along with other water quality and environmental parameters over four years from 2009 to 2012.…”