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Effect of concentrating the virus-rich 2-200-nm size fraction of seawater on the formation of algal flocs (marine snow)
Peduzzi, P.; Weinbauer, M.G. (1993). Effect of concentrating the virus-rich 2-200-nm size fraction of seawater on the formation of algal flocs (marine snow). Limnol. Oceanogr. 38(7): 1562-1265
In: Limnology and Oceanography. American Society of Limnology and Oceanography: Waco, Tex., etc.. ISSN 0024-3590, more
Peer reviewed article  

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Keywords
    Aggregation; Algae; Bacteria; Biomass; Biotic factors; Community composition; Food webs; Marine environment; Particle concentration; Particle size; Viruses; MED, Trieste Gulf [Marine Regions]; Marine

Authors  Top 
  • Peduzzi, P.
  • Weinbauer, M.G.

Abstract
    Particle aggregates >0.5 mm in diameter (marine snow) are an important component of marine environments. Viruses are now recognized as active members of the marine microbial food web, infecting both planktonic primary producers and bacteria. The effect of adding material from the 2-200-nm size fraction, concentrated from seawater with ultrafiltration, on the development of phytoplankton biomass and formation of algal flocs was examined. At higher concentrations of material in this size fraction (2.3 times enrichment with virus-like particles), the buildup of phytoplankton biomass was initially delayed. After 8 d, these enrichments resulted in the formation and persistence of up to 5 times higher numbers of larger aggregates ( greater than or equal to 1-mm equivalent spherical diameter) concomitant with even higher phytoplankton biomass. Both the size distribution of algal aggregates and primary production can be affected by material in the size range of 2-200 nm containing large numbers of viruses.

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