Science Keywords>ATMOSPHERE>ATMOSPHERIC RADIATION>ABSORPTION
EFFECTS OF UV-RADIATION ON ANTARCTIC BACTERIA
 Entry ID: CDA_AR_BIO_EFFECTS_UV_RADIATION

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Summary
Abstract: ENGLISH

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 ESPANOL

Este proyecto tiene por objetivo general analizar el efecto que la radiacion UV
incidente en Antartica tiene sobre la flora bacteriana. Se analizaran dos
sistemas diferentes:

a) Efecto sobre bacterias marinas costeras. Se continuaran ensayos ya
iniciados, utilizando filtros diferenciales que permitan inferir los efectos de
las diferentes bandas de radiacion (PAR, UV-A y UV-B) sobre la viabilidad de
las cepas predominantes en el ecosistema marino costero como asi tambien sobre
la comunidad completa. Se realizaran tambien ensayos de exposicion a diferentes
profundidades, utilizando a la columna de agua como filtro natural. Estos
estudios se realizaran no solo con sistemas estaticos, sino tambien dinamicos,
simulando el regimen natural de circulacion al que estan sometidos los
microorganismos. Los ensayos a campo se complementaran y compararan con ensayos
en laboratorio sometiendo a las cepas a diferentes regimenes de irradiacion. En
todos los casos se evaluara la viabilidad por recuento de viables y se
analizara la formacion de especies reactivas del oxigeno.

b) Efecto sobre las bacterias del ecosistema terrestre antartico asociadas a la
vegetacion. Se sabe que el exceso de radiacion UV produce en la vegetacion
variadas respuestas de defensa que incluyen la produccion de flavonoides y
otros pigmentos protectores. Dado que estos compuestos tienen una conocida
accion antibiotica, el exceso de radiacion UV podria estar modificando cuali y
cuantitativamente la comunidad bacteriana de los suelos antarticos en forma
indirecta, a traves de su accion sobre la escasamente variada vegetacion. Esta
parte del proyecto tiene por objetivo estudiar las poblaciones de Deschampsia
antarctica y Colobanthus quitensis en el area de Base Jubany, Antartica y
analizar si su respuesta a la radiacion UV puede relacionarse con la dinamica
de las comunidades bacterianas asociadas a ellas.

This data set description is a member of a collection. Click to see members of this collection.

Geographic Coverage
 N: -52.0 S: -65.0  E: -50.0  W: -64.0

Data Set Citation
Dataset Originator/Creator: Mac Cormack, Walter Patricio
Dataset Title: Evaluacion de los efectos directos e indirectos de la radiacion UV sobre las comunidades bacterianas antarticas.
Other Citation Details: Project_40, 2002-2004


Temporal Coverage
Start Date: 2002-01-01


Location Keywords
OCEAN > ATLANTIC OCEAN > SOUTH ATLANTIC OCEAN
CONTINENT > ANTARCTICA > CALETA POTTER
CONTINENT > ANTARCTICA > JUBANY STATION
GEOGRAPHIC REGION > POLAR
VERTICAL LOCATION > LAND SURFACE
VERTICAL LOCATION > SEA SURFACE


Science Keywords
ATMOSPHERE >ATMOSPHERIC RADIATION >ABSORPTION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >INCOMING SOLAR RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >LONGWAVE RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >NET RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >SHORTWAVE RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >SOLAR RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >ULTRAVIOLET RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION    [Definition]
BIOSPHERE >VEGETATION >PIGMENTS    [Definition]
AGRICULTURE >SOILS >MICROFLORA    [Definition]
BIOLOGICAL CLASSIFICATION >BACTERIA/ARCHAEA    [Definition]
BIOLOGICAL CLASSIFICATION >PLANTS    [Definition]


ISO Topic Category
FARMING
BIOTA


Project
EUVRAB >Effects of UV radiation on Antarctic bacteria    [Information]


Keywords
UV radiation
bacterial flora
coastal marine bacteria
PAR
UV-A
UV-B
bacterial community
water column
UV filter
flavonoids
UV-screen pigments
Deschampsia antarctica
Colobanthus quitensis
Jubany Station
Antarctica


Data Set Progress
COMPLETE


Originating Center
AR/CDA > Centro de Datos Antarticos, Argentina


Data Center
Centro de Datos Antarticos, Argentina    [Information]
Data Center URL: http://www.dna.gov.ar/
Dataset ID: CDA_AR_BIO_EFFECTS_UV_RADIATION

Data Center Personnel
Name: CELIA ELBA IZQUIERDO
 Phone: 54-11-4812-2086
Fax: 54-11-4812-2086
Email: celeiz_antar at hotmail.com
Email: celeiz at dna.gov.ar
Email: cda at dna.gov.ar
Contact Address:
Centro de Datos Antarticos
Direccion Nacional del Antartico
Instituto Antartico Argentino
Cerrito 1248
 City: Capital Federal
Postal Code: C1010AAZ
Country: ARGENTINA


Personnel
CELIA ELBA IZQUIERDO
Role: DIF AUTHOR
Phone: 54-11-4812-2086
Fax: 54-11-4812-2086
Email: celeiz_antar at hotmail.com
Email: celeiz at dna.gov.ar
Email: cda at dna.gov.ar
Contact Address:
Centro de Datos Antarticos
Direccion Nacional del Antartico
Instituto Antartico Argentino
Cerrito 1248
City: Capital Federal
Postal Code: C1010AAZ
Country: ARGENTINA


WALTER PATRICIO MACCORMACK
Role: TECHNICAL CONTACT
Role: INVESTIGATOR
Phone: 54-11-4816-5734
Fax: 54-11-4812-2039
Email: wmac at huemul.ffyb.uba.ar
Contact Address:
Departamento Ciencias Biologicas
Direccion Nacional del Antartico
Instituto Antartico Argentino
Cerrito 1248
City: Capital Federal
Postal Code: C1010AAZ
Country: Argentina



Creation and Review Dates
DIF Creation Date: 2003-10-14
Last DIF Revision Date: 2005-06-15

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