Distribution of diatoms in the Northeast Water Polynya, Greenland

被引:81
作者
vonQuillfeldt, CH
机构
[1] Norwegian College of Fishery Science, University of Tromsø
基金
加拿大自然科学与工程研究理事会;
关键词
diatoms; species composition; water column; ice; melt pools;
D O I
10.1016/S0924-7963(96)00056-5
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
This study formed part of the Northeast Water project (NEW project) which dealt with physical, geophysical and biological processes in the Northeast Water Polynya off Northeast Greenland. This was part of the International Arctic Polynya Programme (IAPP). The diatom composition of the water masses, sea ice and melt ponds was analysed to show the relationship between ice and the water column near the ice with regard to the origin and fate of the cells in the ice and melt ponds. Fragilariopsis oceanica, Fragilaria sp. 1 and Chaetoceros socialis usually dominated the phytoplankton, while the ice and melt pond samples showed a wide range of assemblages, with different single-celled pennates and two undescribed species, Nauicula sp. 1 and Nitzschia sp. 1 often dominant. Planktonic algae in sea ice can be released into the water column during ice break-up and melt, thus contributing to the spring bloom in the water column, if the timing of the release and the species composition are correct. The number of different ice algal assemblages supports the theory that cells originated from the water column, the benthos and freshwater. In addition, differential growth in the sea ice or melt ponds often altered the relative abundance of species in comparison with what is usually found in their original habitat. However, many of the cells in the ice and melt ponds were dead (empty frustules), making it difficult to determine whether the cells had actually lived in these habitats.
引用
收藏
页码:211 / 240
页数:30
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