Comparing the effects of resource enrichment and grazing on viral production in a meso-eutrophic reservoir

被引:80
作者
Weinbauer, MG
Christaki, U
Nedoma, A
Simek, K
机构
[1] Netherlands Inst Sea Res, Dept Biol Oceanog, NL-1790 AB Den Burg, Netherlands
[2] UPMC, LOV, UMR CNRS 7093, F-06234 Villefranche Sur Mer, France
[3] Natl Ctr Marine Res, Inst Oceanog, Athens 19013, Greece
[4] Acad Sci Czech Republ, Inst Hydrobiol, Ceske Budejovice 37005, Czech Republic
[5] Univ S Bohemia, Fac Biol Sci, Ceske Budejovice, Czech Republic
关键词
viral lysis; bacterial production; system productivity; dialysis bag incubation;
D O I
10.3354/ame031137
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
As viral production depends on bacteria, factors which influence bacterial production should also impact viral production. Likewise, viruses and heterotrophic nanoflagellates (HNF) both exploit bacterial prey, so HNF grazing could influence interactions between viruses and bacteria. To examine these relationships, we examined samples from experiments in which natural bacterial populations were subjected to relaxation of nutrient limitation and different levels of grazing pressure from HNF. We observed that stimulation of bacterial production and abundance with the relaxation of nutrient limitation resulted in a higher standing stock of viruses, higher viral production and also a higher virus-induced lysis rate of bacterioplankton. These relationships suggest that the relative effect of virus-induced mortality is higher in more productive environments. We found that viral abundance, viral production and virus-induced mortality of bacteria was highest in the treatments in which grazing rates on bacteria by HNF were highest, and lowest in the treatments where no eukaryotic predators were present. Thus, high grazing rates were associated with high virus production rates. The resource enrichment had a stronger effect on viral production and infection of bacteria than grazing. Averaged over time for single treatments, viruses lysed a significant portion (range, 18 to 66%) of the bacterial production per day.
引用
收藏
页码:137 / 144
页数:8
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