Annual changes of bacterial mortality due to viruses and protists in an oligotrophic coastal environment (NW Mediterranean)
Annual changes of bacterial mortality due to viruses and protists in an oligotrophic coastal environment (NW Mediterranean)
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DOI：
10.1111/j.1462-2920.2008.01849.x
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发表时间：
2009-05-01
影响因子：
5.1
通讯作者：
Vaque, Dolors
中科院分区：
文献类型：
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作者：
Boras, Julia A.;Sala, M. Montserrat;Vaque, Dolors
在贫养沿海环境(地中海西北部)的两年中(2005年5月至2007年4月)，每月审查病毒和原生生物对浮游细菌死亡率的影响。我们预计，在这种类型的系统中，(I)细菌损失将主要由原生生物引起，(Ii)溶原性将是病毒-宿主相互作用的重要类型。在研究期间，病毒和食草动物共同造成了50.6+/-40.1%的细菌蓄积量损失(BSS)和59.7+/-44.0%的细菌产量损失(BP)。在第一年(2005年5月至2006年4月)，原生生物是细菌死亡的主要原因，去除了29.9+/-20.4%的BSS(-1)和33.9+/-24.3%的BP(-1)，而病毒裂解去除了13.5+/-17.0%的BSS(-1)和12.3+/-12.3%的BP(-1)。在第二年(2006年5月至2007年4月)，病毒对原生生物造成了类似的细菌损失(BSS 29.2+/-14.8%天(-1)和BP 40.9+/-20.7%天(-1))(BSS 28.6+/-25.5%天(-1)和BP 32.4+/-20.0%天(-1))。在37%的病例中，病毒导致的BP损失高于原生生物造成的BP损失。在24份样本中有11份检测到溶源性感染。与我们的预期相反，溶血性感染在这两年中占主导地位，病毒导致了这个寡营养部位细菌死亡的一个重要来源。
The impact of viruses and protists on bacterioplankton mortality was examined monthly during 2 years (May 2005-April 2007) in an oligotrophic coastal environment (NW Mediterranean Sea). We expected that in such type of system, (i) bacterial losses would be caused mainly by protists, and (ii) lysogeny would be an important type of virus-host interaction. During the study period, viruses and grazers together were responsible for 50.6 +/- 40.1% day(-1) of bacterial standing stock losses (BSS) and 59.7 +/- 44.0% day(-1) of bacterial production losses (BP). Over the first year (May 2005-April 2006), protists were the principal cause of bacterial mortality, removing 29.9 +/- 20.4% day(-1) of BSS and 33.9 +/- 24.3% day(-1) of BP, whereas viral lysis removed 13.5 +/- 17.0% day(-1) of BSS and 12.3 +/- 12.3% day(-1) of BP. During the second year (May 2006-April 2007), viruses caused comparable bacterial losses (29.2 +/- 14.8% day(-1) of BSS and 40.9 +/- 20.7% day(-1) of BP) to protists (28.6 +/- 25.5% day(-1) of BSS and 32.4 +/- 20.0% day(-1) of BP). In 37% of cases higher losses of BP due to viruses than due to protists were found. Lysogenic infection was detected in 11 of 24 samplings. Contrary to our expectations, lytic infections dominated over the two years, and viruses resulted to be a significant source of bacterial mortality in this oligotrophic site.