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Differential feeding by marine flagellates on growing versus starving, and on motile versus nonmotile, bacterial prey Public Deposited

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  • Previous work has demonstrated selective feeding by bacterivorous protists on the of prey size. Other prey characteristics may also affect protist grazing rates. In this relative uptake rates of fluorescently labeled bacterial (FLB) cells made from starving bacteria (S-FLB), and of live-stained motile vs non-motile bacteria by marine We also determined relative growth rates and digestion times for flagellates fed starved bacteria. A natural assemblage of marine flagellates and a flagellate isolate, showed lower (p < 0.001) clearance rates on S-FLB than on G-FLB, which could be grazing by the flagellates. Moreover, flagellates showed longer (p < 0.001) prey times when feeding on S-FLB than on G-FLB. The carbon-based gross growth fed starved bacteria was nearly twice that of flagellates fed growing bacteria: 38.5% respectively. Uptake rates by flagellates of several live-stained bacteria (LSB) of strains were compared with uptake rates of heat-killed FLB made from the same cultures. Clearance rates were significantly higher for LSB compared to FLB only for differences in uptake rates were observed for non-motile bacteria. Although FLB for non-motile bacteria, use of FLB may lead to underestimation of actual grazing comprise a significant fraction of the total bacterial assemblage. Our results suggest starved bacteria results in a more efficient transfer of biomass to higher trophic on growing bacteria; (2) use of motile LSB in prey uptake experiments should yield of bacterivory compared to rates estimated using heat-killed or non-motile labeled factors affecting predator-prey dynamics may be important in regulating elemental microbial food webs.
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  • Gonzalez, J. M., Sherr, E. B., & Sherr, B. F. (1993). Differential feeding by marine flagellates on growing versus starving, and on motile versus nonmotile, bacterial prey. Marine Ecology Progress Series, 102, 257-267.
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  • 102
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  • NSF grants OCE-8823091 and OCE-8816428 to B.F.S. and E.B.S.Postdoctoral fellowship from the Spanish Ministry of Education and Science awarded to J.M.G.
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