中国科学院南海海洋研究所机构知识库
Advanced  
SCSIO OpenIR  > 海洋微食物网高被引文献  > 期刊论文
学科主题: Environmental Sciences & Ecology; Marine & Freshwater Biology; Oceanography
题名: PHOSPHORUS CYCLING AND ALGAL-BACTERIAL COMPETITION IN SANDSFJORD, WESTERN NORWAY
作者: THINGSTAD, TF ; SKJOLDAL, EF ; BOHNE, RA
刊名: MARINE ECOLOGY-PROGRESS SERIES
发表日期: 1993-01-01
卷: 99, 期:3, 页:239-259
英文摘要: Microbial phosphorus-cycling, with particular emphasis on algal/bacterial competition, was studied in depth profiles through the halocline separating a brackish top layer, rich in nitrate and poor in phosphate, from the underlying coastal water, poor in both nitrate and phosphate, in the Sandsfjord area, western Norway. At 2 stations along the axis of natural freshwater outflow, physiological P-deficiency of algae and bacteria in the brackish layer was inferred from rapid luxury consumption of added PO43- by organisms in size fractions > 1 mum and 1-0.2 mum, respectively. In a branch of the fjord without natural freshwater outlets, luxury consumption in the brackish layer was less, and without a clear difference between the 2 water layers. High luxury consumption coincided with short (< 30 min) turnover times for PO43- and strong bacterial dominance of (PO43-)-P-32-uptake, suggesting bacterial superiority as competitors during P-limiting conditions. Estimation of P-specific maximum uptake rate and affinity for PO43--uptake from isotope dilution experiments indicated bacterial superiority at low and algal superiority at high concentrations. Although most of the P-32 hydrolyzed from added (gamma-ATP)-P-32 was initially liberated as free (PO4)-P-32 partitioning of incorporated P-32 between size fractions > 1 mum and 1-0.2 mum was found to depend on whether label was added as (gamma-AVP)-P-32 or as (PO43-)-P-32, indicating that coupling of uptake to hydrolysis by cell-bound enzymes could modify the outcome of algal-bacterial phosphorus competition. Disappearance rate of P-32 from the 1-0.2 mum size fraction following initial labeling and a subsequent cold chase with PO43- was used to estimate the flow-rate of phosphorus through the microbial food web. Combined with measured kinetic constants for PO43- uptake, alkaline phosphatases and 5'nucleotidases, a coherent flow-scheme could only be obtained assuming very low (< 1 nmol l-1) concentrations of PO43- and nucleotides. Chemically measured concentrations of dissolved organic phosphorus (DOP) more than 2 orders of magnitude above the estimated nucleotide level and with an estimated turnover time of ca 500 h, are consistent with the view that this large P-reservoir consists mainly of slowly hydrolyzable polymers.
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/344004/9296
Appears in Collections:海洋微食物网高被引文献_期刊论文

Files in This Item: Download All
File Name/ File Size Content Type Version Access License
PHOSPHORUS CYCLING AND ALGAL-BACTERIAL COMPETITION IN SANDSFJORD, WESTERN NORWAY.pdf(1784KB)----开放获取--View Download

Recommended Citation:
THINGSTAD, TF; SKJOLDAL, EF; BOHNE, RA.PHOSPHORUS CYCLING AND ALGAL-BACTERIAL COMPETITION IN SANDSFJORD, WESTERN NORWAY,MARINE ECOLOGY-PROGRESS SERIES,1993,99(3):239-259
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[THINGSTAD, TF]'s Articles
[SKJOLDAL, EF]'s Articles
[BOHNE, RA]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[THINGSTAD, TF]‘s Articles
[SKJOLDAL, EF]‘s Articles
[BOHNE, RA]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: PHOSPHORUS CYCLING AND ALGAL-BACTERIAL COMPETITION IN SANDSFJORD, WESTERN NORWAY.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2017  中国科学院南海海洋研究所 - Feedback
Powered by CSpace