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Conditions of Use

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.
2 ) Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.
3 ) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier. For example:

Shaver, G. 1989. Above ground biomass in acidic tussock tundra experimental site, 1989, Arctic LTER, Toolik, Alaska. Arctic LTER, Marine Biological Lab, Woods Hole, Ma 02543. 1989gsttbm http://ecosystems.mbl.edu/arc/terrest/biomass/index.shtml 

4 ) Acknowledgement. The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example:

Data sets were provided by the Arctic LTER. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493.

5 ) Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.
6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.

Disclaimer

While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data, Dataset via LTER Data Poral
Dataset ID:1987-1988WaterTrack_Vegetation13C-15N.02
Dataset Title:Arctic LTER 1988: del 13C and del 15N ratios measurement for Eriophorum, Carex and lichen species in water tracks at Toolik and Imnavait Creek
Investigator 1: 
First Name:Donald
Last Name:Schell
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 2: 
First Name:Bruce
Last Name:Barnett
Associate Investigators:
Keywords:lakes, arctic lakes, Eriophorum, Carex, Imnaviat, lichens, delta 13C, delta 15N
Abstract:del 13C and del 15N ratios were measured for plant and lichen in watertracks in the Toolik Lake drainage and the east facing slope of the Imnavait Creek area. Sampling locations for each species for a specific date were chosen across an elevation gradient starting from the lakeside and leading to ridge crest. The vegetation was dried and analyzed for stable isotopes.
For questions about the Metadata and data contact the Investigators.
For information about this web site contact:
Arctic LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7496
Email: arc_im@mbl.edu
Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File URL http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10335&urlTail=terrest/delC-13/data/1987-1988WaterTrack_Vegetation13C-15N.csv
Data File Name 1987-1988WaterTrack_Vegetation13C-15N
Beginning Date 8/6/1987
End Date 8/15/1988
Number of Data Records 140
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: For Archival Use: DATE RECEIVED: DATA FILE ENTERED BY: DATA FILE VALIDATION: NAME: DATE:
Version 1: Old computer files were amalgamated into one single file; Missing data was entered from the original thesis (source below) and methods were updated and clarified from the original source.
Version 2: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 27Jan14
 
RESEARCH LOCATION:                  
Location Name Toolik Imnavait watertrack Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One  
Geographic Description Water track entering Toolik Lake Imnavait Creek, Alaska, U.S.A. 68o 37' N, 149o 17' W. Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description  
Location Bounding Box                  
West Bounding Coordinate                  
East Bounding Coordinate                  
North Bounding Coordinate                  
South Bounding Coordinate                  
OR if single point location                  
Latitude 68.629961 68.616 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Longitude -149.612633 -149.283 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Elevation 719 In Meters In Meters In Meters In Meters In Meters In Meters In Meters  
Link to Google Map View on Google Map View on Google Map              
                   
 
TAXONOMIC COVERAGE:
Organisms studied Betula nana; Carex bigelowii; Petasites hyperboreus; Salix pulchra; Vaccinium vitis-idaea; Polygonum bistorta; Salix phlebophylla; Salix reticulata; Eriophorum agustifolium; Cetraria cucullata; Cetraria nivalis; Cladonia amaurocraea; Dactylina arctica; Masonhalea richardsonii; Stereocaulon tomentocum
 
Methods:Plants were sampled at five different locations within a water track from Imnavait Creek and Toolik Lake. These locations were determined by dividing the water track into five segments beginning at the ridge crest and extending to the end fo the track in the stream floodplain. For each sampling date attempts were made to collect species representing several different plant growth forms along the entire water track. For each species, collection of branches, leaves and roots were made from at least five healthy green individuals and placed inside plastic bags. Samples were stored frozen until processed.

Vegetation was dried, ground to a fine powder and prepared for stable isotope analysis.

For isotopic analysis 30 mg of dried plant matter was ground with 1.1 to 1.5 g of CuO per 30 mg of sample in a Wig-L-Bug dental amalgam mixer. The CuO sample mixture was then placed in a 5 cm by 6 mm quartz tube and inserted into a 30 cm by 9 mm quartz tube. To obtain sufficient quantities of nitrogen gas for anlaysis, 2 to 3 such tubes were processed for each sample. Tubes with samples were then dried for an additional 12 hours at 70 degrees C, evacuated wot < 1mTorr on a vacuum manifold and sealed with an oxygen-gas torch. The evacuated tubes were combusted in a muffle furnace at 870 degrees C for one hour and allowed to cool slowly for at least 12 hours.
Gases liberated by combustrion were separated and collected by cryogenic distillation on a vacuum manifold using the procedures described by Handley et al (1991). Briefely the sample were introduced into an evacuated line with a stainless steel tube cracker (Des Marais and Hayes, 1976). Carbon dioxide and water vapour were isolated by a liquid nitrogen cooled distilation loop and the remaining nitrogen was cleansed of any trace CO2 and H2O vapours by passage through a second liquid nitrogen cooled loop. N2 gas was compressed into a 15 cm by 6 mm borosilicate glass tube and sealed off with an oxygen-gas torch. Temperature of the CO2 trap was raised to about -80 deg. C and the CO2 sublimed from the trap. the CO2 was collected in glass tubes cooled with liquid N2 and sealed with a torch. Isotopic ratios of collected gasses were measured on a VG Isogas Sira-9 or a VG Series II dual inlet mass spectrometer.

del 13C = [(13C/12C sample / 13C/12C standard) - 1] x 1000
del 15N = [(15N/14N sample / 15N/14N standard) - 1] x 1000

REFERENCE:
Barnett, Bruce Alan, 1994. Carbon and Nitrogen Isotope Ratios of Caribou tissues, vascular plants and Lichens from Northern Alaska. Masters Thesis, University of Alaska, Fairbanks, School of Fisheries and Ocean Sciences. Supervisor Don Schell, Aug 3, 1994.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Site Name Updated site name text        
Date Date datetime   dd-mmm-yyyy    
Elevation toposequence station text        
Species plant species sampled text        
DEL C-13 del 13C ratio number partPerThousand     .=Missing or Not Measured
DEL N-15 del 15N ratio number partPerThousand     .=Missing or Not Measured

Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.