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* Corresponding author 1 Biology - Department of Biology 2 DIPO - Diversité et Interactions au sein du Plancton Océanique ADMM - Adaptation et diversité en milieu marin

Abstract : Viruses have recurrently been hypothesized as instrumental in driving microbial population diversity. Nonetheless, viral mediated coexistence of r-k-strategists, predicted in the Killing-the-Winner KtW hypothesis, remains controversial and demands empirical evidence. Therefore, we measured the life strategy parameters that characterize the relevant system Micromonas-Micromonas Virus MicV. A large number of host and viral strains 37 and 17, respectively were used in a total of 629 cross-infectivity tests. Algal and viral abundances were monitored by flow cytometry and used to calculate values of growth rate, resistance capacity, and viral production. Two main assumptions of the KtW model , namely 1 a resistance-associated cost on growth and 2 a negative correlation between resistance and viral production capacity, were mildly observed and lacked statistical significance. Micro-monas strains infected by more MicV strains presented higher lysis and viral production rates as the number of infectious virus strains increased, suggesting a -one-gate- regulation of infection in this system. MicV strains demonstrated a vast range of virion production capacity, which unexpectedly grew with increasing host-range. Overall, the significant trends observed in here demonstrate strong co-interactions at different levels between Micromonas and MicV populations, however, the role of viruses as major driving force in phytoplankton fitness wasn-t explicitly observed.

Autor: Eliana Ruiz - Anne-Claire Baudoux - Nathalie Simon - Ruth-Anne Sandaa - T. Frede Thingstad - António Pagarete -

Fuente: https://hal.archives-ouvertes.fr/


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