SCSIO OpenIR  > 海洋微食物网高被引文献
Community structure, picoplankton grazing and zooplankton control of heterotrophic nanoflagellates in a eutrophic reservoir during the summer phytoplankton maximum
Simek, K; Hartman, P; Nedoma, J; Pernthaler, J; Springmann, D; Vrba, J; Psenner, R
1997
发表期刊AQUATIC MICROBIAL ECOLOGY
ISSN0948-3055
卷号12期号:1页码:49-63
摘要An intensive 5 wk study was conducted to investigate the role of protists, especially heterotrophic nanoflagellates (HNF), in microbial food webs during the summer phytoplankton bloom in the epilimnion and metalimnion of the eutrophic Rimov reservoir (South Bohemia, Czech Republic). On average, protists consumed similar to 90% of bacterial production in both layers. The community composition of HNF and the relative importance of different HNF groups as picoplankton consumers were determined. Small HNF (<8 mu m), as chrysomonads, bodonids and choanoflagellates, usually accounted for <30% of total HNF biomass but numerically dominated the community in both layers. They consumed most of (similar to 70 to 85 %) the bacterioplankton as well as autotrophic picoplankton (APP, exclusively cyanobacteria) production in the reservoir, with the rest consumed by ciliates. Both ciliates and HNF had higher clearance rates on APP than on bacteria and their grazing was likely responsible for a sharp decrease in APP abundance (from 3-4 x 10(5) to <2 x 10(3) ml(-1)) and a very constant size structure of bacterioplankton in which short rods in the size class of 0.4 to 0.8 mu m constituted 55 to 80 % of the total bacterial biomass in both layers. The proportion of HNF to total picoplankton biomass in the epilimnion indicated that the picoplankton biomass was sufficiently high to support HNF growth for most of the study. Uptake of picoplankton by less numerous, but larger, HNF (kathablepharids, Goniomonas sp., and Streptomonas sp.) was negligible, while their biomass, especially in the metalimnion, exceeded that of small HNF and the total biomass of picoplankton. This suggested that food items other than picoplankton were consumed to meet their carbon requirements. Analyzing potential bottom-up and top-down factors controlling HNF numbers and biomass, we did not find a tight relationship between HNF and the concentration of bacteria and chlorophyll. Variability of HNF abundance and biomass in the epilimnion could largely be explained by cladocerans or by pooled abundances of all potential crustacean consumers of HNF. In the metalimnion, the mean cell volume of HNF was positively linked to chlorophyll but negatively to the abundance of Cyclopidae and to the pooled abundances of Ceriodaphnia quadrangula and Diaphanosoma brachyurum.
部门归属INNSBRUCK UNIV, INST ZOOL & LIMNOL, A-6020 INNSBRUCK, AUSTRIA; UNIV KONSTANZ, INST LIMNOL, D-78434 CONSTANCE, GERMANY
关键词Nanoflagellates Community Structure Picoplanktivory Bacterial Production Food Webs
学科领域Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Microbiology
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语种英语
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/9370
专题海洋微食物网高被引文献
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Simek, K,Hartman, P,Nedoma, J,et al. Community structure, picoplankton grazing and zooplankton control of heterotrophic nanoflagellates in a eutrophic reservoir during the summer phytoplankton maximum[J]. AQUATIC MICROBIAL ECOLOGY,1997,12(1):49-63.
APA Simek, K.,Hartman, P.,Nedoma, J.,Pernthaler, J.,Springmann, D.,...&Psenner, R.(1997).Community structure, picoplankton grazing and zooplankton control of heterotrophic nanoflagellates in a eutrophic reservoir during the summer phytoplankton maximum.AQUATIC MICROBIAL ECOLOGY,12(1),49-63.
MLA Simek, K,et al."Community structure, picoplankton grazing and zooplankton control of heterotrophic nanoflagellates in a eutrophic reservoir during the summer phytoplankton maximum".AQUATIC MICROBIAL ECOLOGY 12.1(1997):49-63.
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