BIOCHEMICAL-COMPOSITION AND PHOTOSYNTHATE DISTRIBUTION IN SEA ICE MICROALGAE OF MCMURDO-SOUND, ANTARCTICA - EVIDENCE FOR NUTRIENT STRESS DURING THE SPRING BLOOM

被引：48

作者：

LIZOTTE, MP

SULLIVAN, CW

机构：

[1] Biology Department, Montana State University, Bozeman

[2] Hancock Institute of Marine Studies, Department of Biological Sciences, University of Southern California, Los Angeles

来源：

ANTARCTIC SCIENCE | 1992年 / 4卷 / 01期

关键词：

BIOCHEMICAL COMPOSITION; DIATOMS; NUTRIENTS; PHOTOSYNTHESIS; SEA ICE; SEA ICE ALGAE;

D O I：

10.1017/S0954102092000063

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The nutrient status of microalgae inhabiting sea ice in McMurdo Sound, Antarctica was evaluated during the peak and decline of the spring bloom in November and December. Natural populations of microalgae were analysed for C, N, chlorophyll a, protein, lipid, polysaccharide, and low-molecular-weight carbohydrate content, and for the distribution of C-14-labelled photosynthate into macromolecular fractions. Ratios of N:C and protein to carbohydrate (PR:CHO) were similar to values reported for nutrient-limited phytoplankton. Biochemical ratios and C-14-photosynthate allocation patterns suggest that microalgae from congelation ice habitats may be more nutrient-stressed than those from underlying platelet ice habitats. This trend would be consistent with the presumed gradient of seawater nutrient influx through the platelet layer to the bottom congelation ice habitat. Microalgae from congelation ice subjected to an experimental depletion of nutrients (particularly nitrate) showed decreased N:C, PR:CHO, and allocation of C-14-photosynthate to proteins. This evidence suggests that sea ice microalgae are nutrient-stressed during the peak and decline of the spring bloom in McMurdo Sound, which presumably begins when microalgal biomass concentrations and demands for growth reach or exceed the rate of nutrient supply from underlying seawater.

引用

页码：23 / 30

页数：8

共 52 条

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