globalchange  > 气候变化事实与影响
DOI: 10.1002/2013GB004589
Scopus记录号: 2-s2.0-84886733978
论文题名:
Structure and interactions within the pelagic microbial food web (from viruses to microplankton) across environmental gradients in the Mediterranean Sea
作者: Di Poi E; , Blason C; , Corinaldesi C; , Danovaro R; , Malisana E; , Fonda-Umani S
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期:4
起始页码: 1034
结束页码: 1045
语种: 英语
英文关键词: microbial food webs ; microplankton ; nanoplankton ; pelagic systems ; prokaryotes ; viruses
Scopus关键词: Eastern Mediterranean ; Environmental gradient ; Microbial food web ; Microplanktons ; nanoplankton ; Nutrient availability ; prokaryotes ; Western Mediterranean ; Biomass ; Carbon ; Computer viruses ; Energy transfer ; Plankton ; Viruses ; Ecology ; abundance ; biomass ; carbon flux ; energy flow ; environmental gradient ; food web ; microbial activity ; microplankton ; mortality ; pelagic ecosystem ; trophic level ; Mediterranean Sea ; Prokaryota
英文摘要: We have investigated here the structure of the pelagic microbial food web and quantified the carbon fluxes from viruses to microplankton along trophic gradients in the Mediterranean Sea. To explore the complex trophic pathways of the pelagic food web, we conducted independent and replicated experiments to measure (i) predation on prokaryotes by microzooplankton, (ii) predation on prokaryotes by heterotrophic nanoflagellates, (iii) virus-induced prokaryotic mortality, and (iv) microzooplankton grazing on nanoplankton and microphytoplankton. Our study covered more than 5000 km, from the Atlantic Ocean to the Levantine basin, and from conditions of high primary production and nutrient availability to ultraoligotrophic and phosphate-limited waters. Microphytoplankton abundance and biomass were typically scarce across the entire Mediterranean basin, with almost negligible levels in the eastern part. Also, nanoplankton biomass was typically low. Conversely, prokaryotes, and particularly the heterotrophic components, were abundant and represented the only significant food source for both nanoplankton and microplankton grazers. Viral infections were not the primary agents of prokaryotic mortality, but in some areas, such as the Ligurian Sea, they had a key role in prokaryotic dynamics. The scenario depicted in this study in summer reveals the pivotal role of microzooplankton in the pelagic food web of the Mediterranean Sea, with a key role in the potential transfer of biomass to higher trophic levels. We also show that converse to theoretical expectations, the microbial food web was relatively complex under the mesotrophic conditions (Atlantic and western Mediterranean) and was much more simplified in the ultraoligotrophic conditions of the eastern Mediterranean. Key Points Major Carbon fluxes through pelagic microbial food web over a trophic gradient Shift from classical to microbial food web following the trophic gradient Pivotal role of microzooplankton as transfer of energy to higher trophic levles ©2013. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77546
Appears in Collections:气候变化事实与影响

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作者单位: Department of Life Science, University of Trieste, via Giogieri 10, 34143 Trieste, Italy; Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy

Recommended Citation:
Di Poi E,, Blason C,, Corinaldesi C,et al. Structure and interactions within the pelagic microbial food web (from viruses to microplankton) across environmental gradients in the Mediterranean Sea[J]. Global Biogeochemical Cycles,2013-01-01,27(4)
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