Shift from Carbon Flow through the Microbial Loop to the Viral Shunt in Coastal Antarctic Waters during Austral Summer.
Shift from Carbon Flow through the Microbial Loop to the Viral Shunt in Coastal Antarctic Waters during Austral Summer.
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DOI：
10.3390/microorganisms9020460
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发表时间：
2021-02-23
期刊：
影响因子：
4.5
通讯作者：
Brussaard CPD
中科院分区：
文献类型：
--
作者：
Evans C;Brandsma J;Meredith MP;Thomas DN;Venables HJ;Pond DW;Brussaard CPD
通过病毒分流和微生物环的碳的相对流动是控制次级生产对食物网的贡献以及对营养再矿化和呼吸速率的关键因素。目前的研究审查了这些过程在南极沿海水域多产的南半球夏季月份中的意义。在整个研究过程中，观察到了浮游细菌和异养纳米鞭毛虫(HNF)丰度降低的总体趋势，而浮游病毒的浓度却增加了。相应地，HNF的放牧率下降，并转向病毒生产，这表明病毒感染。高氮肥放牧调节的碳流减少了一半以上，从12月和1月的平均5.7微克C L−1天−1下降到2月的2.4微克C L−1天−1。相反，通过病毒分流的碳流量在研究期间大幅增加，从12月份的平均0.9ug C L−1天−1增加到2月份的7.6ug C L−1天−1。这项研究表明，南极沿海微生物群落的功能在夏季的几个月里有很大的变化。在初夏，该系统有利于通过微生物循环将物质和能量转移到更高的营养水平，但在夏末，碳流被重新定向到病毒分流，导致转向更多的循环，从而增加呼吸和再生。
The relative flow of carbon through the viral shunt and the microbial loop is a pivotal factor controlling the contribution of secondary production to the food web and to rates of nutrient remineralization and respiration. The current study examines the significance of these processes in the coastal waters of the Antarctic during the productive austral summer months. Throughout the study a general trend towards lower bacterioplankton and heterotrophic nanoflagellate (HNF) abundances was observed, whereas virioplankton concentration increased. A corresponding decline of HNF grazing rates and shift towards viral production, indicative of viral infection, was measured. Carbon flow mediated by HNF grazing decreased by more than half from 5.7 µg C L−1 day−1 on average in December and January to 2.4 µg C L−1 day−1 in February. Conversely, carbon flow through the viral shunt increased substantially over the study from on average 0.9 µg C L−1 day−1 in December to 7.6 µg C L−1 day−1 in February. This study shows that functioning of the coastal Antarctic microbial community varied considerably over the productive summer months. In early summer, the system favors transfer of matter and energy to higher trophic levels via the microbial loop, however towards the end of summer carbon flow is redirected towards the viral shunt, causing a switch towards more recycling and therefore increased respiration and regeneration.
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影响因子：
5.1
作者：
Boras, Julia A.;Sala, M. Montserrat;Vaque, Dolors
通讯作者：
Vaque, Dolors
DOM 源、汇、反应性和预算
DOI：
10.1016/b978-0-12-405940-5.00003-0
发表时间：
2015-01-01
期刊：
BIOGEOCHEMISTRY OF MARINE DISSOLVED ORGANIC MATTER, 2ND EDITION
影响因子：
--
作者：
Carlson, Craig A.;Hansell, Dennis A.
通讯作者：
Hansell, Dennis A.
影响因子：
4.4
作者：
Evans, Claire;Brussaard, Corina P. D.
通讯作者：
Brussaard, Corina P. D.
影响因子：
2.8
作者：
Ducklow, Hugh W.;Schofield, Oscar;Erickson, Matthew
通讯作者：
Erickson, Matthew
DOI：
10.1016/j.dsr2.2008.04.035
发表时间：
2008-09-01
影响因子：
3
作者：
Clarke, Andrew;Meredith, Michael P.;Thomas, David N.
通讯作者：
Thomas, David N.