Baseline concentrations of elements in the Antarctic macrolichen Umbilicaria decussata

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Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: Baseline concentrations of elements in the Antarctic macrolichen Umbilicaria decussata
Description:
Abstract:
Total concentrations of major and trace elements were determined in samples of the epilithic lichen Umbilicaria decussata from 24 ice-free areas in coastal Victoria Land (Antarctica) during 1991 - 2001. Overall average concentrations of trace elements except Cd were the lowest ever reported for lichens of the genus Umbilicaria. Specifically, the mean level of Pb in lichen from granitic rock (0.46 +/- 0.18 mg/g-1 dry wt) was more than four times lower than the lowest record in Arctic lichens. No impact of local human activities was detected, but the elemental composition of U. decussata was affected by entrapment of soil of rock dust particles and probably by uptake of soluble elements from substrate. Relationship between elements and their distributions patterns in the study area indicated that the marine environment is the main source of major ions and perhaps of Cd in lichens. Accumulation of P was detected in samples from coastal sites frequented by seabirds. Although the present results can be taken as baseline levels of major and trace elements in Antarctic U. decussata from substrates with very different geochemical features, further research is necessary to evaluate the relative element contribution from each substrate with respect to those from snow, marine aerosol, salt encrustation and guano.
Purpose:
Not Available
Supplemental_Information:
Not Available
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 170.1666
East_Bounding_Coordinate: 162.4166
North_Bounding_Coordinate: -72.0333
South_Bounding_Coordinate: -77.0333
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > SOILS > MICRONUTRIENTS/TRACE ELEMENTS
Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > FUNGI > LICHENS
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOGEOCHEMICAL CYCLES
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOTOXICOLOGY > SPECIES BIOACCUMULATION
Theme_Keyword: FIELD INVESTIGATION
Theme_Keyword: SOIL SAMPLER
Theme_Keyword: SPECTROMETERS
Theme_Keyword: (sector 1) Major And Trace Elements
Theme_Keyword: (sector 1) Heavy Metals
Theme_Keyword: (sector 1) Lichens
Theme_Keyword: (sector 1) Terra Victoria
Theme_Keyword: (sector 1) Terra Nova Bay
Theme_Keyword: Lichen U. Decussata And Surface Soil From Victoria Land (antarctica)
Theme_Keyword: BIOTA
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: ENGLISH (WESTERN - ISO 8859-1 CHAR SET)
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > ANTARCTICA > TERRA NOVA BAY
Place_Keyword: CONTINENT > ANTARCTICA > VICTORIA LAND
Place_Keyword: GEOGRAPHIC REGION > ARCTIC
Place_Keyword: GEOGRAPHIC REGION > POLAR
Access_Constraints: Not Available
Use_Constraints:
none
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
A composite sample of U. decussata thalli was collected from boulders and rock outcrops in 24 hours. In each site, a sample of surface soil was collected. In the laboratory of Baia Terra Nova station, the lichen and soil samples were dried at 40 degrees C for 36 hrs. The lichens were then sorted to remove extraneous materials and dead or senescent tissue. Soil samples were sorted to remove gravel and larger organic debris and then sieved through a 0.20 mm screen. Once in Italy samples were mineralized in clean Teflon vessels under pressure with 2.5 ml conc. HNO3 at 120 degrees C for 8 hrs. A total of 13 elements were analyzed in the mineralized samples. Al, Fe, Na, K, Ca, Mg, Mn, Cu, P and Zn concentrations were determined by air/acetylene Flame Atomic Absorption spectrometry (FAAS) and by Inductively coupled Plasma Atomic Emission Spectrometry (ICP-AES). Those of Cd, Cr and Pb determined by Electrothermal Atomic Absorption Spectrometry with Zeeman correction (ZETAAS).
Logical_Consistency_Report:
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Completeness_Report:
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Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: UNISI/DSA > Dipartimento di Science Ambientali (G. Sarfatti), Universita Delgi Studi di Siena, Italy
Contact_Person: ROBERTO BARGAGLI
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: via P. A. Mattioli n.4
City: Siena
State_or_Province: Tuscany
Postal_Code: 53100
Country: Italy
Contact_Voice_Telephone: +39 0577 232828
Contact_Facsimile_Telephone: +39 0577 232806
Contact_Electronic_Mail_Address: bargagli@unisi.it
Resource_Description: Antar_Macrolichen_Umbilicaria
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: none
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.unisi.it/ricerca/dip/dba/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: None
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Metadata_Reference_Information:
Metadata_Date: 20040920
Metadata_Review_Date: 20090121
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GCMD User Support Office
Contact_Organization: NASA Global Change Master Directory
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Not Available
City: Lanham
State_or_Province: MD
Postal_Code: 20706
Country: USA
Contact_Voice_Telephone: Not Available
Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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