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