Effect of UV radiation on the bacterivory of a heterotrophic nanoflagellate

Article Abstract:

Bodo saltans, a heterotrophic nanoflagellate, is adversely affected by both artificial and natural UV-B radiation. The radiations decrease the bacterivory content of the species. UV radiation causes the appearance of a nonmotile spherical cell, in contrast to the ellipsoidal-oval shape of motile cells that are characteristic of B. saltans. Reduced motility affects the bacterial feeding capacity of B. saltans, influencing its bacterivory. This results in a positive feedback between UV radiation and bacterial growth.

Ultraviolet radiation, Microorganisms, Cell motility

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714082Quantifying substrate uptake by individual cells of marine bacterioplankton by catalyzed reporter deposition fluorescence in situ hybridization combined with microautoradiography

Article Abstract:

The potential of catalyzed reporter deposition fluorescence in situ hybridization combined with microautoradiography (MICRO-CARD-FISH) for obtaining not only qualitative information but also quantitative information concerning substrate uptake by specific prokaryotic populations is evaluated. Results reveal that the increase in the silver grain area over time around leucine-assimilating cells of coastal bacterial assemblages is linear during 4 to 6 h of incubation.

Genetic aspects, Prokaryotes, Marine bacteria

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Inhibitory effect of solar radiation on thymidine and leucine incorporation by freshwater and marine bacterioplankton

Article Abstract:

The effects of ultraviolet radiation, UV-A and UV-B, and photosynthetically active radiation (PAR) on bacterial incorporation of radio labeled thymidine and leucine are determined in freshwater and marine bacterioplankton. Results reveal that UV-A radiation and PAR reduces the incorporation of thymidine and leucine in these bacterioplankton. The implications of these findings on production in ecological systems are discussed.

Environmental aspects, Marine plankton, Plankton, Solar radiation

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