Concept information
Preferred term
EUVRAB
Definition
- The objective of this project is to analyze the effect that the incident UV radiation has on the Antarctic bacterial flora. Two different systems will be studied: a) Effect on coastal marine bacteria. We will continue with experimental assays using interferential filters in order to infer the effects of the different wavelength bands ... (PAR, UV-A y UV-B) on the viability of the predominant bacterial strains of the coastal marine ecosystem as well as on the bacterial community as a whole. Assays at different deeps using the water column as a natural UV filter will be performed. These studies will be made not only using fixed systems but using dynamic systems too, in order to simulate the natural vertical circulation of the water masses and the microorganisms living in such water masses. The field studies will be complemented and compared with laboratory assays where the bacterial isolates will be maintained under different irradiation regimes. In all cases, bacterial viability will be evaluated by viable counts. In addition, generation of oxygen-reactive species will be analyzed. b) Effect on the soil bacteria associated to Antarctic plants. It is well known that the UV radiation induces on the vegetation a number of responses including production of flavonoids and other UV-screen pigments. Since some authors have reported that these compounds have biocide activity, an excess of UV radiation could be affecting indirectly the Antarctic soils bacterial communities through their action on the scarce vegetation. The objective of this part of the project is to study the populations of Deschampsia antarctica and Colobanthus quitensis in the surrounding of Jubany Station, Antarctica and to analyze if their response to UV radiation are related to the dynamics of bacterial communities associated to their structures. (en)
Broader concept
- D - F (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/2b7a861e-8b52-4e95-9311-6339c7e3fc83
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