Fraction of prokaryotes killed by virus lysis out of total prokaryotes in coastal, mesopelagic and deep ocean sediments

Range 16% coastal sediments: 64% mesopelagic sediments: 89% deep ocean sediments %
Organism Biosphere
Reference Danovaro R, Dell'Anno A, Corinaldesi C, Magagnini M, Noble R, Tamburini C, Weinbauer M. Major viral impact on the functioning of benthic deep-sea ecosystems. Nature. 2008 Aug 28 454(7208):1084-7. p.1086 left column top paragraphPubMed ID18756250
Method "[Researchers] collected a data set of 232 deep-sea sediment samples and measured the impact of viruses on deep-sea benthic prokaryotes and biogeochemical cycles. [Their] data cover latitudes from 79° N to 34° S, and all depths from 165 m to 5,571 m (sampling location and details on the data set is provided in Supplementary Table 1 and Fig. 1), and include deep-sea sites spanning a wide range of bottom-water temperatures and trophic conditions. Measurements of viral and prokaryotic abundance and production were carried out synoptically on the same samples and by using the same protocols for the entire data set, thus ensuring methodological consistency."
Comments "[Researchers] estimated the impact of viruses on benthic prokaryotic production, calculating the number of prokaryotes killed as the ratio between viral production and prokaryotic burst size. Using the mean burst size of the time course experiments (burst size of 45) [they] calculated that viruses are responsible for the abatement of 80% of the total prokaryotic heterotrophic production in global deep-sea sediments. Virus-induced prokaryotic mortality increases with water depth from 16%±3% (mean±s.e.m., n = 11) in coastal sediments to 64%±3% in mesopelagic sediments (>160–1,000-m depth, n = 41) to 89%±2% in sediments beneath 1,000-m depth (n = 67 Fig. 3)... The release of labile organic material from killed prokaryotic cells has important implications for carbon cycling and nutrient regeneration on a global scale."
Entered by Uri M
ID 104967