The experimental study of the interaction between Amphidinium carterae Hulburt and Krenia mikim otoi Hansen is carried in ecological conditions..The results showed tha in single culture system,A.carterae and K.mikimot...The experimental study of the interaction between Amphidinium carterae Hulburt and Krenia mikim otoi Hansen is carried in ecological conditions..The results showed tha in single culture system,A.carterae and K.mikimotoi growth curves Karen Logistic growth model,different initial density ratio could have a significant impact on the growth of two microalgae:With the initial density increases,the exponential phase and stationary phase is due to come earlier,and instantaneous population growth rate(r)and environmental carrying capacity(K)decreased.展开更多
Calcified coccolithophores, a diverse and widely distributed group of marine microalgae, produce biogenic calcite in the form ofcoccoliths located on the cell surface. Using batch incubations of the coccolithophorid P...Calcified coccolithophores, a diverse and widely distributed group of marine microalgae, produce biogenic calcite in the form ofcoccoliths located on the cell surface. Using batch incubations of the coccolithophorid Pleurochrysis carterae, we investigated the responses of this calcification process to iron concentrations by changing the iron supply in the initial culture media from a normal concentration to 1 ppm （parts per million）, 5 ppm, and 10 ppm. Time-dependent measurements of cell population, production of inorganic carbon （coccoliths）, and organic carbon （organic cellular components） showed that elevated iron supply in the growth medium of P. carterae stimulates carbon sequestration by increasing growth along enhanced photosynthetic activity and calcification. In addition, the acquired time-dependent UV-Vis and FT-IR spectra revealed that iron fertilization- enhanced coccolith calcification is accompanied by a crystalline phase transition from calcite to aragonite or amorphous phase. Our results suggest that iron concentration has a significant influence on the marine carbon cycle of coccolithophores.展开更多
文摘The experimental study of the interaction between Amphidinium carterae Hulburt and Krenia mikim otoi Hansen is carried in ecological conditions..The results showed tha in single culture system,A.carterae and K.mikimotoi growth curves Karen Logistic growth model,different initial density ratio could have a significant impact on the growth of two microalgae:With the initial density increases,the exponential phase and stationary phase is due to come earlier,and instantaneous population growth rate(r)and environmental carrying capacity(K)decreased.
文摘Calcified coccolithophores, a diverse and widely distributed group of marine microalgae, produce biogenic calcite in the form ofcoccoliths located on the cell surface. Using batch incubations of the coccolithophorid Pleurochrysis carterae, we investigated the responses of this calcification process to iron concentrations by changing the iron supply in the initial culture media from a normal concentration to 1 ppm （parts per million）, 5 ppm, and 10 ppm. Time-dependent measurements of cell population, production of inorganic carbon （coccoliths）, and organic carbon （organic cellular components） showed that elevated iron supply in the growth medium of P. carterae stimulates carbon sequestration by increasing growth along enhanced photosynthetic activity and calcification. In addition, the acquired time-dependent UV-Vis and FT-IR spectra revealed that iron fertilization- enhanced coccolith calcification is accompanied by a crystalline phase transition from calcite to aragonite or amorphous phase. Our results suggest that iron concentration has a significant influence on the marine carbon cycle of coccolithophores.
