In 19 phytoplankton samples collected from 14 water bodies in the southeastern part of China and examined by electron microscopy, 27 taxa of silica-scaled chrysophytes (8 of them belonging to the Chrysophyceae and 19 ...In 19 phytoplankton samples collected from 14 water bodies in the southeastern part of China and examined by electron microscopy, 27 taxa of silica-scaled chrysophytes (8 of them belonging to the Chrysophyceae and 19 to the Synuriphyceae) were found. All these taxa are new to Fujian province;24 of them were previously found in China, but 3, viz. Chrysosphaerella septispina, Mallomonas rasilis and M. guttata var. simplex are new to China. M. guttata var. simplex has only been reported from the Ontario region, Canada. The silica-scaled chrysophyte flora and their geographical distribntion in thisregion are discussed.展开更多
A significant outbreak of fishy odor occurred in a reservoir located in Inner Mongolia, China, in the winter of 2011, and the odor rating, algal density and concentrations of some potential odorous compounds were moni...A significant outbreak of fishy odor occurred in a reservoir located in Inner Mongolia, China, in the winter of 2011, and the odor rating, algal density and concentrations of some potential odorous compounds were monitored over a period of two months. The peak odor rating of the fishy odor was 7 according to flavor profile analysis. Among the dominant algal species （two diatom and one chrysophyte species） observed during the survey, the chrysophyte Dinobryon sp. was the most abundant species, with the peak density recorded at 88,520 cells/mL. Seven potential algal metabolites including heptanal, 2,4-heptadienal, 2,4-decadienal, nonanal, 2-octenal, 2,6- nonadienal and hexanal were detected. The principal component analysis result showed that n-hexanal, n-heptanal and 2,4-decadienal, possibly the metabolites of diatoms, and 2,4-heptadienal, possibly the metabolite of Dinobryon sp., might have contributed to the fishy odor episode. This study demonstrated that the fishy odor episode in this reservoir might be caused by the abnormal growth of chrysophytes and diatoms under the ice-cover.展开更多
文摘In 19 phytoplankton samples collected from 14 water bodies in the southeastern part of China and examined by electron microscopy, 27 taxa of silica-scaled chrysophytes (8 of them belonging to the Chrysophyceae and 19 to the Synuriphyceae) were found. All these taxa are new to Fujian province;24 of them were previously found in China, but 3, viz. Chrysosphaerella septispina, Mallomonas rasilis and M. guttata var. simplex are new to China. M. guttata var. simplex has only been reported from the Ontario region, Canada. The silica-scaled chrysophyte flora and their geographical distribntion in thisregion are discussed.
基金supported by the National Natural Science Foundation of China(No.5093800721377144)+1 种基金Watershed Eutrophication Management in China through System Oriented Process Modelling of PressuresImpacts and Abatement Actions(No.GJHZ1203)
文摘A significant outbreak of fishy odor occurred in a reservoir located in Inner Mongolia, China, in the winter of 2011, and the odor rating, algal density and concentrations of some potential odorous compounds were monitored over a period of two months. The peak odor rating of the fishy odor was 7 according to flavor profile analysis. Among the dominant algal species （two diatom and one chrysophyte species） observed during the survey, the chrysophyte Dinobryon sp. was the most abundant species, with the peak density recorded at 88,520 cells/mL. Seven potential algal metabolites including heptanal, 2,4-heptadienal, 2,4-decadienal, nonanal, 2-octenal, 2,6- nonadienal and hexanal were detected. The principal component analysis result showed that n-hexanal, n-heptanal and 2,4-decadienal, possibly the metabolites of diatoms, and 2,4-heptadienal, possibly the metabolite of Dinobryon sp., might have contributed to the fishy odor episode. This study demonstrated that the fishy odor episode in this reservoir might be caused by the abnormal growth of chrysophytes and diatoms under the ice-cover.
