Drivers of the Ceratium hirundinella and Microcystis aeruginosa coexistence in a drinking water reservoir

Abstract

Drivers of the Ceratium hirundinella and Microcystis aeruginosa coexistence in a drinking water reservoirThe spatial and temporal patterns of phytoplankton in relation to physical and chemical properties were studied in a drinking water reservoir -the Lázbérc Reservoir -located in north-east Hungary. The main objectives were to determine the role of the hydrologic regime in structuring algal growth and the effects of physical and chemical variables on the coexistence of a dominant species: cyanobacteria, Microcystis aeruginosa (Kützing) Kützing and an eukaryotic dinoflagellates, Ceratium hirundinella (O.F. Müller) Dujardin. The results suggest that nutrients (TP, NH 4 -N and NO 3 -N), turbidity, and the hydrologic regime play an important role in regulating the occurrence of investigated species. The rainy summer period resulting in a mixing of the water column, and the low level of nitrogen coupled with the internal release of phosphorus from the lake sediment under brief periods of anoxia promote cyanobacterial bloom. During this period, the water column was characterised by high turbidity, which created favourable conditions for developing a huge C. hirundinella biomass and the simultaneous occurrence of M. aeruginosa. This study also demonstrated -that contrary to what was previously known, deep standing waters in the temperate zone are not only dimictic (mixing twice a year during the spring and the fall), but they can also be mixed during the summer period due to continued rainfall, which equalizes the temperature in the whole water column. This can promote the occurrence of cyanobacterial and eukaryote planktonic organisms.

Water Quality Assessment of a Hydro-Agricultural Reservoir in a Mediterranean Region (Case Study—Lage Reservoir in Southern Portugal)

“…During the period of study, the reservoir showed low levels of transparency, with values between 1.25 m (Jl_2018) to 5 m (Dc_2019). The lowest transparency occurred in the dry period, as observed in other areas of the Mediterranean region [6,37] and in other regions [38,39]. The transparency observed in the reservoir was always within the value stipulated by the APA guide [16] for good ecological potential.…”

A summer in the Greater Paris: trophic status of peri-urban lakes shapes prokaryotic community structure and functional potential

“…Here, the prokaryotic community structure correlates with the trophic status of nine lakes located in the Greater Paris, even when accounting for their intra-summer heterogeneity or the relatively short distances between lakes. Higher Chl a concentrations of hypereutrophic lakes (CSM and VSS) reflect the dominance of blooming taxa including cyanobacterial genera Dolichospermum and Aphanizomenon 7 or the eukaryotic genus Ceratium 72,73 . These phototrophs provide an autochthonous source of organic matter to those lakes.…”

Invasion strategies and establishment of Ceratium dinoflagellate in subtropical watersheds of Southern Brazil and its interaction with Microcystis cyanobacteria: I. Hydrographic Region of Uruguay

“…Microcystis is a genus that presents, with exception to mixotrophy, the same features as Ceratium (Crossetti et al, 2019) and is affected by the invasion of the dino agellate. The interaction between both genders is well known and reported (Van Ginkel et al, 2001;Reynolds et al 2002;Padisák et al, 2009;Grigorszky et al, 2019).…”