strmppvs
English
utf8
dataset
McMurdo Dry Valleys LTER
http://mcmlter.org/
2015-01-20
ISO 19115-2 Geographic Information - North American Profile Metadata - Data with Biological Extensions
ISO 19115-2:2009(E)
Stream Algae Photosynthesis/Light Measurements
2015-01-20
publication
Diane McKnight
University of Colorado Boulder
http://www.colorado.edu/
diane.mcknight@colorado.edu
pointOfContact
documentDigital
As part of the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, a systematic sampling program has been undertaken to monitor the abundance and species distribution of algal mats in glacial meltwater streams of the region. This data set includes results from light and dark incubations of algae to calculate net and gross primary productivity versus light curves of algal communities from Green Creek in Fryxell basin during January 1995. This data set constitutes the LTER algal primary productivity data for streams.
completed
McMurdo Dry Valleys LTER
http://mcmlter.org/
unknown
Data from this table was initially submitted in the ppvsli95.xls file (Microsoft Excel version 5.0). Once submitted to INSTAAR, the file was entered into Microsoft Access and exported in ascii comma delimited and MS-DOS text (table layout) formats. These files are represented in the "strmppvs.dat" and "strmppvs.txt" files used on the web page. In November, 1999, the data manager added a field for stream transect ID code. This assisted in preparing the data for use in Oracle and ArcInfo. In July, 2000, the dataset code field was added in order to simplify generating links between different data and metadata
English
Transect by green Creek above gage Moss Site M-09, F09Green-G Transect 9 Points T091 and T092 mark the start and end of the transect. Start : IDs: 9GREENT091, Ellipsoid: -22.66 ORTHOMETRIC HT (m) 32.58 End: ID: 9GREENT092 Ellipsoid: -26.5 ORTHOMETRIC HT (m) 28.72 File provenance: strm-clg.txt
163.059310913086
163.058395385742
-77.624420166016
-77.623992919922
ground condition
1995-01-01
1995-01-31
https://mcm.lternet.edu/sites/default/files/strmppvs.csv
strmppvs
eng; US
McMurdo Dry Valleys LTER
strmppvs
Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 0 Orientation : Column Quote Character :
"Field Delimiter : ,
false
Dataset code
Code representing stream algae photosynthesis/light measurements dataset
Strmtrnsid
Code representing stream transect
LOCATION
Stream location / name of transect in which measurements were made
DATE_TIME
Date of sample
Date Time Format: mm/dd/yyyy
Algae Type
Type of algae species is associated with (red, black, green or orange)
Replication #
Replication number of sample
INCUBATION TEMP (C)
Temperature at which incubation occurred
Incubation time (hr)
Number of hours spent incubating
PAR (%Full Strength)
Percent of full sunlight under which incubation occurred
PAR (uE/m2/s)
Photosynthetically active radiation
NPP CH OVER TIME(ug C/cm2/hr)
Change in net primary production over time
AFDM (mg/cm2)
Ash-free dry mass
NPP CH/AFDM (ug C/g AFDM/hr)
Change in net primary production per gram of ash-free dry mass over time
File name
Original file name in which this information was submitted
DBF
https://mcm.lternet.edu/sites/default/files/strmppvs.csv
dataset
Within each transect, algal mats were visually identified as either orange, red, black, or green. Not all types of algal mats were found within every transect. Algal samples were collected using a cork borer (1.04 cm2) and placed in vials (volume=21.3 mL). Vials of algae were placed in bags to screen sunlight to 0, 0.5, 1.4, 7.7, 16.4, 31.2, 60.7, 67.0, 100 percent of full sunlight for warm temperature incubations and 0, 1.4, 7.7, 31.2, 100 percent of full sunlight for cool temperature incubations. Algae were incubated in the stream for approximately 2.75-4.0 hours typically between 8:50 am and 5:00 pm. Primary productivity was measured as the change in oxygen concentration in the vial using an oxygen microelectrode. Upon completion of incubation, the algae in the vials were taken back to the lab for AFDM processing. Samples were taken in the area of the LTER monumented transect. Samples for ash-free dry mass measurements were filtered through GF/C glass fiber filters and frozen. The samples were dried (100 degrees C) for 24 hours, weighed, ashed (450 degrees C) for 4 hours, rehydrated with water, dried for 24 hours, and reweighed. Net primary productivity (NPP, light bottles) and community respiration (CR, dark bottles) were calculated as follows: NPP or CR (ug C/cm2/hr)=[(((change in mg O2/L x v) x 0.375 C/O2 x 1000 ug/mg)/area/hours incubated], where O2/L = change in oxygen concentration, v = volume of vial (0.0213 L), C/O2 = atom/atom conversion of oxygen to carbon, area = 1.04 cm2.
Metadata Access Constraints: none Metadata Use Constraints: none
annually
McMurdo Dry Valleys LTER
http://mcmlter.org/
pointOfContact