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Regressions of the logistic model on K. mikimotoi population growth when exposed to seawater acidification conditions.
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Seawater acidification and nutrient alteration are two dominant environmental factors in coastal environments that influence the dynamics and succession of marine microalgae. However, the impacts of their combination have seldom been recorded. A simulated experimental system was set up to mimic the effects of elevated acidification on a bloom-formi...
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Context 1
... affected the growth of K. mikimotoi to a certain extent. We calculated the regressed parameters with a logistic model to quantify the growth dynamics in different treatments ( Table 2). Based on the calculated Logistic parameters, the carrying capacity (K, reflecting the growth potential of algae) as well as the maximum instantaneous growth rate (r) in the pH 7.6 group was higher than those in the pH 8.1 and pH 7.4 group. ...Citations
Karenia mikimotoi is a common harmful algal bloom (HAB)-forming dinoflagellate and has caused severe financial loss in aquaculture. There are limited metabolomic studies on dinoflagellate biology. Here, we examined alterations in metabolic profiles over the growth curve of K. mikimotoi under nitrogen or phosphorus deficiency and further explored a key criterion for the diagnosis of late stationary phase to identify when the dinoflagellate cells will enter bloom demise. The results demonstrate the differential expression of metabolites for coping with chronological aging or nutrient deprivation. Furthermore, an increase in the glucose to glycine ratio in the late stationary phase was indicative of dinoflagellate cells entering bloom demise; this was also detected in the cultured diatom, Chaetoceros tenuissimus, indicating that this may be the general criterion for phytoplankton species. Our findings provide insights regarding chronological aging and the criterion for the prediction of phytoplankton bloom demise.
