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Contrasting controls on microzooplankton grazing and viral infection of microbial prey

TitleContrasting controls on microzooplankton grazing and viral infection of microbial prey
Publication TypeJournal Article
Year of Publication2019
AuthorsTalmy D., Beckett S.J, Zhang A.B, Taniguch D.AA, Weitz J.S, Follows M.J
JournalFrontiers in Marine Science
Date Published2019/04
Type of ArticleArticle
Accession NumberWOS:000465447100001
Keywordsabundance; bacterial-viruses; body-size; encounter; Environmental Sciences & Ecology; Marine & Freshwater Biology; marine viruses; mechanisms; microscale patchiness; Microzooplankton; model; phytoplankton; prey capture; size; virus; Zooplankton

The encounter and capture of bacteria and phytoplankton by microbial predators and parasites is fundamental to marine ecosystem organization and activity. Here, we combined classic biophysical models with published laboratory measurements to infer functional traits, including encounter kernel and capture efficiency, for a wide range of marine viruses and microzooplankton grazers. Despite virus particles being orders of magnitude smaller than microzooplankton grazers, virus encounter kernels and adsorption rates were in many cases comparable in magnitude to grazer encounter kernel and clearance, pointing to Brownian motion as a highly effective method of transport for viruses. Inferred virus adsorption efficiency covered many orders of magnitude, but the median virus adsorption efficiency was between 5 and 25% depending on the assumed host swimming speed. Uncertainty on predator detection area and swimming speed prevented robust inference of grazer capture efficiency, but sensitivity analysis was used to identify bounds on unconstrained processes. These results provide a common functional trait framework for understanding marine host-virus and predator-prey interactions, and highlight the value of theory for interpreting measured life-history traits.

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