uid=MCM,o=EDI,dc=edirepository,dc=org all public read strmppvs Stream Algae Photosynthesis/Light Measurements Diane McKnight diane.mcknight@colorado.edu https://orcid.org/0000-0002-4171-1533 McMurdo Dry Valleys LTER http://mcmlter.org/ 2015-01-20 English
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.
algae respiration stream Station Keywords
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https://mcm.lternet.edu/content/stream-algae-photosynthesislight-measurements 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 163.058395385742 163.059310913086 -77.623992919922 -77.624420166016 30 30 meter 1995-01-01 1995-01-31 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 McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER
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.
strmppvs strmppvs.csv 11927 1 0 \n column , " https://mcm.lternet.edu/sites/default/files/strmppvs.csv Dataset code Dataset code Code representing stream algae photosynthesis/light measurements dataset string Code representing stream algae photosynthesis/light measurements dataset Strmtrnsid Strmtrnsid Code representing stream transect string Code representing stream transect LOCATION Stream name Stream location / name of transect in which measurements were made string Stream location / name of transect in which measurements were made DATE_TIME Date Date of sample date mm/dd/yyyy Algae Type Algae Type Type of algae species is associated with (red, black, green or orange) string Type of algae species is associated with (red, black, green or orange) Replication # Replication # Replication number of sample string Replication number of sample INCUBATION TEMP (C) Incubation temp (celcius) Temperature at which incubation occurred celsius 0.1 real 5 8.8 Incubation time (hr) Incubation time (hr) Number of hours spent incubating hour 0.01 real 2.75 4 Required entry None given PAR (%Full Strength) PAR (%Full Sunlight) Percent of full sunlight under which incubation occurred dimensionless 0.1 real 0 100 Required entry None given PAR (uE/m2/s) PAR (microE/m2/s) Photosynthetically active radiation microE/m2/s 1 real 0 1110 NPP CH OVER TIME(ug C/cm2/hr) NPP Change over Time Change in net primary production over time microgC/cm2/hr 0.01 real -15 15 Required entry None given AFDM (mg/cm2) AFDM (mg/cm2) Ash-free dry mass mg/cm2 0.01 real 0 40 Required entry None given NPP CH/AFDM (ug C/g AFDM/hr) NPP Change per AFDM Change in net primary production per gram of ash-free dry mass over time microgC/gAFDM/hr real -1 1 Required entry None given File name File name Original file name in which this information was submitted string Original file name in which this information was submitted