New record of moss and thermophilic bacteria species and physico-chemical properties of geothermal soils on the northwest slope of Mt. Melbourne (Antarctica) in 2002
Entry ID: Thermophilic_bacteria_Melbourne

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Summary
Abstract: Four samples of surface soils, one with shoots of an unidentified moss species,
were collected from a geothermal site on the northwest slope of volcanic Mt.
Melbourne (northwest Victoria Land, continental Antarctica) to determine
physico-chemical properties, isolate existing strains of etherotrophic
microorganisms, and identify the moss species through molecular genetic
techniques. Surface soils features such as temperatures, grain-size, pH,
moisture content and isolated genera of bacteria, generally corresponded to
those previously reported for other geothermal site in Victoria Land. However,
when compared with chemical characteristics of warm substrata from these sites,
soils from the northwest slope of Mt. Melbourne showed lower contents of total
N and water-extractable PO43- and K+ and relatively high concentrations of Na,
Fe, Mn and of potentially toxic elements such as Cd and Pb. Preliminary results
indicate that a new species of thermophilic bacteria growing in Fe-enriched
medium was isolated. Although the study area lay only about 1.5 km from
Cryptogam Ridge, a geothermal site in the rim of the Mt. Melbourne summit
crater with a well-developed population of the moss Campylopus pyriformis,
molecular genetic analysis showed that the moss of the volcano slope is Pholia
nutans, a species closely related to some populations 110 km to the north in
the Mt. Rittmann fumaroles. It was concluded that physico-chemical features of
geothermal grounds may affects the colonization history and dispersal of
microorganisms and mosses.

Geographic Coverage
 N: -74.3499 S: -74.3499  E: 164.6632  W: 164.6632
 Min Altitude: 2498.0 M

Location Keywords
CONTINENT > ANTARCTICA > MOUNT MELBOURNE
CONTINENT > ANTARCTICA > VICTORIA LAND
GEOGRAPHIC REGION > POLAR


Science Keywords
AGRICULTURE >SOILS >SOIL MOISTURE/WATER CONTENT    [Definition]
AGRICULTURE >SOILS >SOIL PH    [Definition]
LAND SURFACE >SOILS >MICRONUTRIENTS/TRACE ELEMENTS    [Definition]
LAND SURFACE >SOILS >ORGANIC MATTER    [Definition]
LAND SURFACE >SOILS >SOIL TEMPERATURE    [Definition]
OCEANS >MARINE VOLCANISM >HYDROTHERMAL VENTS    [Definition]
SOLID EARTH >GEOTHERMAL DYNAMICS >GEOTHERMAL TEMPERATURE    [Definition]
CRYOSPHERE >FROZEN GROUND >SOIL TEMPERATURE    [Definition]
BIOLOGICAL CLASSIFICATION >BACTERIA/ARCHAEA    [Definition]
BIOLOGICAL CLASSIFICATION >PLANTS >MOSSES/HORNWORTS/LIVERWORTS    [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS >ECOSYSTEM FUNCTIONS >BIOGEOCHEMICAL CYCLES    [Definition]


ISO Topic Category
FARMING
BIOTA


Platform
FIELD INVESTIGATION    [Information]


Instrument
ION CHROMATOGRAPHS    [Information]
AA >Atomic Absorption Spectrometer    [Information]
AAS >Atomic Absorption Spectrophotometry    [Information]


Quality
Four surface soil sample (with and without mosses) were collected along a
thermal gradient and placed in sterile polyethylene bags. In Terra Nova Bay
station the water content and pH were determined in soil subsample. In Italy,
in soil samples was determined the total concentration of organic C and N.
Concentrations of major ions and trace elements were determined by ion
chromatography and atomic absorption spectrometry in water soil extracts.
Isolation, maintenance and characterization of bacteria, moss DNA isolation,
amplification and sequencing were carried out in Italian laboratories.


Use Constraints
none


Keywords
(Sector 1) mosses
(Sector 1) Terra Victoria
soil
moss


Data Set Progress
COMPLETE


Originating Center


Data Center
Dipartimento di Science Ambientali (G. Sarfatti), Universita Delgi Studi di Siena, Italy    [Information]
Data Center URL: http://www.unisi.it/ricerca/dip/dba/

Data Center Personnel
Name: ROBERTO BARGAGLI
Phone: +39 0577 232828
Fax: +39 0577 232806
Email: bargagli at unisi.it
Contact Address:
via P. A. Mattioli n.4
City: Siena
Province or State: Tuscany
Postal Code: 53100
Country: Italy



Distribution
Distribution_Media: Scientific Publications
Fees: none



Creation and Review Dates
DIF Creation Date: 2004-11-22
Last DIF Revision Date: 2005-06-28

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