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学科主题: Oceanography
题名: MICROBIAL BIOMASS AND PRODUCTIVITY IN THE WESTERN BRANSFIELD STRAIT, ANTARCTICA DURING THE 1986-87 AUSTRAL SUMMER
作者: KARL, DM ; HOLMHANSEN, O ; TAYLOR, GT ; TIEN, G ; BIRD, DF
刊名: DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS
发表日期: 1991-01-01
卷: 38, 期:8-9, 页:1029-1055
部门归属: UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,POLAR RES PROGRAM,LA JOLLA,CA 92093
英文摘要: Studies from December 1986 to March 1987 show that waters of Gerlache Strait and the southwestern Bransfield Strait support a rich seasonal bloom of micro-organisms, consisting primarily of phytoplankton. Chlorophyll a concentrations achieved maximum values (> 20 mg Chl a m-3) in December, began to decline in January and exhibited a rapid decrease in February and March to concentrations less-than-or-equal-to 0.3 mg Chl a m-3. The mean cell size of the planktonic assemblage did change, however, from a predominately microplankton (greater-than-or-equal-to 20-mu-m) crop in December to one dominated by nanoplankton (less-than-or-equal-to 20-mu-m) later in the season. Total microbial biomass as estimated by measurement of ATP, however, increased between December and January, followed by a rapid decline in February and March. However, the putative microheterotrophs, bacteria, showed no significant increases either during or immediately following the December to January bloom of phytoplankton, in apparent contrast to studies reported from temperate waters. Bacterial cell numbers did not vary systematically during the 4-month period of observation and thus appeared to be "uncoupled" from phytoplankton dynamics. Rates of assimilation of tritiated organic compounds (glutamate, thymidine, adenine) paralleled the total microbial biomass estimates. All available data (e.g. patterns and rates of organic matter assimilation, Chl/ATP ratios, Chl a concentrations and bacterial cell numbers) suggest that much of the measured heterotrophic activity may be due to the activity of phytoplankton cells. The nature of the microbial food web during the seasonal bloom in Antarctic coastal waters is believed to be a complex function of temperature, photobiological effects related to seasonal deepening of the upper mixed layer, grazing and nutrient regeneration/replenishment. Together these processes determine the composition and total biomass of the microbial assemblage that affects other ecological properties such as the magnitude of new production and the rate of particle flux to deeper waters.
语种: 英语
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/9342
Appears in Collections:海洋微食物网高被引文献_期刊论文

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KARL, DM; HOLMHANSEN, O; TAYLOR, GT; TIEN, G; BIRD, DF.MICROBIAL BIOMASS AND PRODUCTIVITY IN THE WESTERN BRANSFIELD STRAIT, ANTARCTICA DURING THE 1986-87 AUSTRAL SUMMER,DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS,1991,38(8-9):1029-1055
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