| Data Tables, Images, and Other Entities: |
| Data Table: | Units_And_Column_Descriptions
View Table Metadata |
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Short Name: | limnprpr.dat |
| Online Distribution Info: |
| Download File: |
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| Data Set Owner(s): |
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Individual: | John Priscu |
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Address: |
| Department of Biology, |
| 309 Lewis Hall, |
| Montana State University , |
| Bozeman, MT 59717 USA |
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Phone:
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Email Address:
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| Metadata Provider(s): |
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Organization: | McMurdo Dry Valleys LTER |
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Address: |
| Byrd Polar Research Center , |
| 108 Scott Hall, |
| 1090 Carmack Rd, |
| Columbus, OH 43210-1002 USA |
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Phone:
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Phone:
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Email Address:
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| Abstract: |
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An important part of the McMurdo Long Term Ecological Research (LTER) is
monitoring of spatial and temporal patterns, and processes that control phytoplankton
production in perennial ice-covered lakes. This data set addresses this core area of research
and quantifies carbon production at specific depths in McMurdo Dry Valley
lakes.
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| Keywords: |
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- lake
(theme)
- limnology
(theme)
- primary production
(theme)
- carbon
(theme)
- chlorophyll
(theme)
- phytoplankton
(theme)
- Antarctica
(theme)
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| Additional Information: |
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| Comments |
If the dpm for the dark bottle was higher than the average dpm of the light
bottles then primary production was reported as zero. Incubation times are usually 0700 hours
local time to 0700 hours the following day.
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| Citations |
| Notes |
Data contained in these files has been subjected to quality control standards
imposed by the investigator. The user of this data should be aware that, while efforts have
been taken to ensure that these data are of the highest quality, there is no guarantee of
perfection for the data contained herein and the possibility of errors exists. If you
encounter questionable data, please contact the MCM LTER data manager corrected or qualified.
Thus, these data may be modified and future data will be appended.
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| License and Usage Rights: |
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| MCM LTER data may be used freely with the following restrictions: |
The Principal Investigator be sent a notice stating reasons for acquiring any
data and a description of the publication intentions.
The Principal Investigator of the data set be sent a copy of the report or
manuscript prior to submission and be adequately cited in any resultant
publications.
A copy of any resultant publications should be sent to the McMurdo data
manager and principal investigator.
The end-user follow the guidelines set forth in the LTER Network Data Access
Policy, Data Access Requirements, and General Data Use Agreement found at
http://www.mcmlter.org/data_guidelines.htm
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| Geographic Coverage: |
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Geographic Description: | Samples were collected from the East Lake Bonney, West Lake Bonney, Lake
Hoare, and Lake Fryxell limnological sampling stations, located in the McMurdo Dry Valleys of
Antarctica. |
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Bounding Coordinates:
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| West: | 162 degrees
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| East: | 163.6 degrees
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| North: | -77.2 degrees
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| South: | -77.8 degrees
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Mimimum Altitude: | 0 meter |
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Maximum Altitude: | 1000 meter |
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| Temporal Coverage: |
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Begin:
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End:
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| Maintenance: |
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Description:
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Data from this table was submitted to INSTAAR by John Priscu's team at Montana
State University. The raw data files listed under 'file name' are the names of the original
files submitted. The 1993/94 and 1994/95 datasets are Microsoft Excel version 6.0 files, and
the 1995/96, 1996/97 and 1997/98 datasets are ascii text files. Upon arrival at INSTAAR, the
data manager fine-tuned the location codes and limno runs to match those provided in the
"locations, dates, codes for lake chemistry, biology samples" file. The file was imported
into Microsoft Access on INSTAAR's Unix system, and can currently be found there. The file
was then exported in ascii, comma delimited text and MS-DOS text (table layout) on the MCM
LTER web site. Both of these files are linked to this web page above. Information for the
metadata was obtained from the Metappr9697.rtf file. The file was called up using Microsoft
Word version 6.0. Text from this file was used to create this page in html
format.
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Frequency:
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| Contact: |
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Organization: | McMurdo Dry Valleys LTER |
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Position: | Data Manager |
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Address: |
| Byrd Polar Research Center , |
| 108 Scott Hall, |
| 1090 Carmack Rd, |
| Columbus, OH 43210-1002 USA |
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Phone:
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Email Address:
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| Publisher: |
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Organization: | McMurdo Dry Valleys LTER |
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Address: |
| Byrd Polar Research Center , |
| 108 Scott Hall, |
| 1090 Carmack Rd, |
| Columbus, |
| Columbus, OH 43210-1002 USA |
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Phone:
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| Methods Info: |
| Step 1: |
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Description:
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Lake water samples were collected at specific depths with a five-liter Niskin
bottle during normal LTER limnological sampling. In a darkened environment, water was
decanted directly from the Niskin bottle into three-150 mL borosilicate glass bottles with
Teflon screw cap liners (2-light, 1-dark). Each sample was inoculated with an appropriate
volume of 14C bicarbonate (activity of working solution should be between 100-121 uCi
mL-1)
Sample bottles were attached to a depth-calibrated cable and incubated in situ for 24 hours.
At the end of the incubation period, the bottles were removed from the lake and placed in a
darkened box for transport to the field lab. Each sample bottle was filtered through a 25 mm
Whatman GF/F filter, and placed at the bottom of a 20 mL scintillation vial (organic matter up).
0.5 mL of 3 N HCl was pipetted into each vial and dry filtered slowly on a heating block (50C)
in a fume hood. Once the filters were dry, the scintillation vials were recapped and stored until
scintillation counting.
10 mL of Cytoscint cocktail was added to each vial and counted on a calibrated 14C liquid
scintillation counter. Primary production (ug C L-1 d-1) was calculated using the following equation:
PPR = (DPML - DPMD) a * b
alpha * t
where DPML is the average dpm of the light bottles, DPMD is the dpm of the dark bottle, a is the
concentration of dissolved inorganic carbon at the respective depth, b is a constant (1.06) to adjust
for isotopic discrimination of 14C radiolabeled carbon, alpha is the total dpm of 14C added to the
sample, and t is the incubation period.
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