“However, mesocosm studies on the effect of high initial ambient CO2 (750 μatm) on coccolithophore assemblages have shown an increase in POC production .”
“Effect of CO2 concentration on the PIC/POC ratio in the coccolithophore Emiliania huxleyi grown under light-limiting conditions and different day lengths.”
“Understanding the ecology and production of coccolithophores under both bloom and non-bloom conditions is crucial for assessing how climate change and ocean acidification will affect coccolithophore communities and the important biogeochemical cycles that they contribute to," said Poulton.”
“Instead, the researchers suspect that micronutrients such as iron play an important role in controlling coccolithophore growth and calcification.”
“Their results, which were published in 2009, indicate that iron availability may exert a strong control on coccolithophore growth and calcification.”
“Furthermore, Poulton is joining a research cruise this summer (led by Prof. Eric Acterberg of SOES with colleagues from NOC and Portsmouth University) to the North Atlantic, again to examine in greater detail the conclusions of the first two studies - specifically the role of iron in calcification, and the role of zooplankton grazing in controlling coccolithophore numbers.”
“Comparison of cellular calcification rates with the environmental factors currently associated with coccolithophore blooms gave no clear pattern, including sunlight, mixed layer depth, and the availability of nutrients such as nitrate and phosphate.”
“Emiliania huxleyi is a species of coccolithophore found in oceans all around the world, from the tropics to the Arctic Ocean.”
“Measurements of phytoplankton growth, calcification (calcite plate formation), and coccolithophore abundance were made during the trip.”
“Our study had two main aims - firstly to measure cell calcification and its variability, and secondly to make comparison between these and environmental conditions so as to help identify those factors that control coccolithophore growth and calcite production during non-bloom conditions," said Dr Alex Poulton of NOC.”
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