The present paper deals with the composition and distribution of nano-and microdiatoms in sands and grits covered by ice and snow in the intertidal zones of the Zhongshan Station in Larsemann Hills (69°21'～6...The present paper deals with the composition and distribution of nano-and microdiatoms in sands and grits covered by ice and snow in the intertidal zones of the Zhongshan Station in Larsemann Hills (69°21'～69°25'S, 76°00'～76°25'E ), East Antarctica. The samples were collected from seven sand-grit flat stations in January 1989 and February 1990. The highest cell density of nano-and microdiatoms occurred at Station B. The cell concentration was 0. 8×103～3651×103 cells per gram sand in January 1989 and 4. 5×103～2618×103 cells Per gram in February 1990 respectively.The nano-and microdiatoms in the intertidal zones were small in cell size and high in abundance. The dominant species was Navicula glaciei.展开更多
For the first time, nanodiatoms (<20μm) and microdiatoms (>20μm) in the coastal waters of Xiamen, Shandu, Fuqing, Haitan, Putian and Meizhou of Fujian Province along the western coast of the Taiwan Strait are ...For the first time, nanodiatoms (<20μm) and microdiatoms (>20μm) in the coastal waters of Xiamen, Shandu, Fuqing, Haitan, Putian and Meizhou of Fujian Province along the western coast of the Taiwan Strait are quantitatively counted by TEM in the paper. The results show that the number of nanodiatoms from all the station is more than that of microdiatoms, accounting for 92% of the species collected. This indicates that nanodiatoms constitute a large microcosm of the whole diatom group. Unfortunately, the lower resolution of light microscopes which have been used in the study of diatoms in the past makes this unneglectable microcosm unnoticed. Thanks to TEM, 47 species of nanodiatoms are identified and four of them are for the first time recorded in China. The new records are Hantzschia spectabilis, Navicula crucigera, Nav. spicula andNitzs. rosenstockii. The positive correlation between the contents of chlorophyll a and diatom cell number in the waters of Xiamen Harbour, which were determined simultaneously, shows that the variation of chlorophyll a content in the waters reflects, on the whole, the change of diatom number. In addition, the successful culture of nanodiatoms in the studies provides alternatives for the screening of high quality aquaculture feed.展开更多
文摘The present paper deals with the composition and distribution of nano-and microdiatoms in sands and grits covered by ice and snow in the intertidal zones of the Zhongshan Station in Larsemann Hills (69°21'～69°25'S, 76°00'～76°25'E ), East Antarctica. The samples were collected from seven sand-grit flat stations in January 1989 and February 1990. The highest cell density of nano-and microdiatoms occurred at Station B. The cell concentration was 0. 8×103～3651×103 cells per gram sand in January 1989 and 4. 5×103～2618×103 cells Per gram in February 1990 respectively.The nano-and microdiatoms in the intertidal zones were small in cell size and high in abundance. The dominant species was Navicula glaciei.
文摘For the first time, nanodiatoms (<20μm) and microdiatoms (>20μm) in the coastal waters of Xiamen, Shandu, Fuqing, Haitan, Putian and Meizhou of Fujian Province along the western coast of the Taiwan Strait are quantitatively counted by TEM in the paper. The results show that the number of nanodiatoms from all the station is more than that of microdiatoms, accounting for 92% of the species collected. This indicates that nanodiatoms constitute a large microcosm of the whole diatom group. Unfortunately, the lower resolution of light microscopes which have been used in the study of diatoms in the past makes this unneglectable microcosm unnoticed. Thanks to TEM, 47 species of nanodiatoms are identified and four of them are for the first time recorded in China. The new records are Hantzschia spectabilis, Navicula crucigera, Nav. spicula andNitzs. rosenstockii. The positive correlation between the contents of chlorophyll a and diatom cell number in the waters of Xiamen Harbour, which were determined simultaneously, shows that the variation of chlorophyll a content in the waters reflects, on the whole, the change of diatom number. In addition, the successful culture of nanodiatoms in the studies provides alternatives for the screening of high quality aquaculture feed.
