Alternation of diatoms and coccolithophores in the north-eastern Black Sea: a response to nutrient changes

Characterization of ultraphytoplankton pigments and functional community structure in Xiangxi Bay, China, using HPLC-CHEMTAX

“…The predominant biomarker pigments were Fuco, Allo, Zeax, and Chl b, which signified abundances of diatoms, cryptophytes, cyanobacteria, and chlorophytes, respectively. Earlier studies have shown that diatoms dominate under conditions of high nutrients (Mikaelyan et al 2015). In the present in situ investigation, a similar ultraphytoplankton succession was observed in XXB throughout the study period.…”

Coastal zones as important habitats of coccolithophores: A study of species diversity, succession, and life‐cycle phases

“…Looking at the whole phytoplankton community, we noted the dominance over the phytoplankton community of coccolithophores during winter and diatoms during summer. In the north‐eastern Black Sea, coccolithophores and diatoms successively dominated the phytoplankton community, and these two phytoplankton groups were controlled by different nutrients (Mikaelyan et al ). Mikaelyan et al () concluded that high biomass of diatoms corresponded to the increased ammonium, while high phosphorus determined the proliferation of coccolithophores.…”

“…In the north‐eastern Black Sea, coccolithophores and diatoms successively dominated the phytoplankton community, and these two phytoplankton groups were controlled by different nutrients (Mikaelyan et al ). Mikaelyan et al () concluded that high biomass of diatoms corresponded to the increased ammonium, while high phosphorus determined the proliferation of coccolithophores. In our study, we did not relate diatoms and coccolithophores to aforementioned conditions, although we must note that our concentrations of P were much lower than those reported by Mikaelyan et al ().…”

“…Mikaelyan et al () concluded that high biomass of diatoms corresponded to the increased ammonium, while high phosphorus determined the proliferation of coccolithophores. In our study, we did not relate diatoms and coccolithophores to aforementioned conditions, although we must note that our concentrations of P were much lower than those reported by Mikaelyan et al (). In our study coccolithophores were more abundant in waters of high salinity, while diatoms were more abundant in high temperature waters.…”

Importance of coccolithophore‐associated organic biopolymers for fractionating particle‐reactive radionuclides (234Th, 233Pa, 210Pb, 210Po, and 7Be) in the ocean

“…Therefore, the two most abundant eukaryotic phytoplankton taxa in the open ocean make different contributions to the fractionation extent of radionuclides between particles, colloids (e.g., EPS), and solution during their scavenging in the water column. This implies that diatoms‐ and coccolithophore‐dominated marine environments (e.g., high nitrogen environments favor the growth of diatoms, but coccolithophores prefer high‐phosphate conditions [ Mikaelyan et al ., ]) would potentially have different conditions for the scavenging and fractionation of radionuclides. For instance, no significant fractionation between Th and Pa (Figure ) would be expected to be observed in a coccolithophore‐dominated water column, while the frustules and intracellular biopolymers of diatom cells would be expected to concentrate more Pa relative to Th [ Chuang et al ., ].…”