Effect of seawater-freshwater cross-transplantations on viral dynamics and bacterial diversity and productionReportar como inadecuado




Effect of seawater-freshwater cross-transplantations on viral dynamics and bacterial diversity and production - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 LOV - Laboratoire d-océanographie de Villefranche 2 Bioemco - Biogéochimie et écologie des milieux continentaux 3 CAMELIA - Caractérisation et modélisation des échanges dans des lagons soumis aux influences terrigènes et anthropiques

Abstract : Dilution experiments were carried out to investigate the community composition and the metabolic response of seawater and freshwater bacteria to cross-transplantation, and the effects of nor.-indigenous bacterial hosts on viral dynamics. Changes in viral and bacterial abundance and production, as Well as bacterial respiration, carbon demand and diversity were regularly monitored over a 6 d period. Bacterial production in the transplanted seawater SB-t and freshwater FB-t bacteria treatments was stimulated up to 256 and 221 %, respectively, compared to controls. The stimulation of bacterial production and carbon demand was accompanied by a decrease in bacterial richness. Net viral production was stimulated by 81% in SB-t and repressed by 75% in FB-t. Transplantation increased the virus-induced mortality of marine bacteria, but decreased it for freshwater bacteria. These results suggest that 1 marine bacteria can readily oxidize freshwater dissolved organic matter, and 2 freshwater viruses might be able to infect marine hosts, thus highlighting their potential role in fueling bacterial growth under resource stress or nutrient-depleted conditions.

Keywords : Transplantation Bacterial production Bacterial richness Virus





Autor: O. Bonilla-Findji - Emma Rochelle Newall - M.G. Weinbauer - M.D. Pizay - M.E. Kerros - J.P. Gattuso -

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



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