FRESH-WATER STREAM ECOSYSTEMS OF JAMES-ROSS ISLAND, ANTARCTICA

被引：40

作者：

HAWES, I

BRAZIER, P

机构：

[1] DSIR, Taupo Research Laboratory, Taupo, Tuwharetoa Street

[2] Natural Environment Research Council, Cambridge, CB3 OET, High Cross, Mading ley Road

来源：

ANTARCTIC SCIENCE | 1991年 / 3卷 / 03期

关键词：

ALGAL ASSEMBLAGES; CYANOBACTERIA; DIEL VARIATION; PHOTOSYNTHESIS;

D O I：

10.1017/S0954102091000329

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The freshwater streams of James Ross Island share many of the features common to other Antarctic streams. There is a diel variation in temperature and discharge, which follows the daily insolation cycle; catchments are barren; stream vegetation is predominantly algal, comprising mat-forming cyanobacteria and filamentous chlorophytes; and physical factors, particularly turbidity and bed stability are important in determining biomass and composition of algal assemblages. Nutrient concentrations vary from stream to stream and over a diel cycle, with minimum dissolved N in the late afternoon. Biomass attained and photosynthetic and respiratory rates are also comparable to those recorded in other Antarctic streams, with low productivity/biomass ratios in perennial assemblages.

引用

页码：265 / 271

页数：7

共 14 条

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