Diane M. McKnight 2015-01-20 Stream Algae Photosynthesis/Light Measurements tabular digitial data McMurdo Dry Valleys LTER McMurdo Dry Valleys LTER 10.6073/pasta/ffa099b021b7285bab061c75973b478e https://mcm.lternet.edu/content/stream-algae-photosynthesislight-measurements 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. 1995-01-01 1995-01-31 ground condition 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 As needed 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 -77.623992919922 -77.624420166016 30m 30m meter [term:vocabulary] None <cntorg>McMurdo Dry Valleys LTER</cntorg> <onlink>http://mcmlter.org/</onlink> <span property="dc:title" content="McMurdo Dry Valleys LTER" class="rdf-meta element-hidden"></span> Not Applicable Not Applicable Field and/or Lab Methods 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. 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. unknown strmppvs Dataset code Code representing stream algae photosynthesis/light measurements dataset The data provider Code representing stream algae photosynthesis/light measurements dataset Strmtrnsid Code representing stream transect The data provider Code representing stream transect Stream name Stream location / name of transect in which measurements were made The data provider Stream location / name of transect in which measurements were made Date Date of sample The data provider calendar date/time mm/dd/yyyy gregorian calendar Algae Type Type of algae species is associated with (red, black, green or orange) The data provider Type of algae species is associated with (red, black, green or orange) Replication # Replication number of sample The data provider Replication number of sample Incubation temp (celcius) Temperature at which incubation occurred The data provider 5 8.8 celsius 0.1 Incubation time (hr) Number of hours spent incubating The data provider 2.75 4 hour 0.01 PAR (%Full Sunlight) Percent of full sunlight under which incubation occurred The data provider 0 100 dimensionless 0.1 PAR (microE/m2/s) Photosynthetically active radiation The data provider 0 1110 microE/m2/s 1 NPP Change over Time Change in net primary production over time The data provider -15 15 microgC/cm2/hr 0.01 AFDM (mg/cm2) Ash-free dry mass The data provider 0 40 mg/cm2 0.01 NPP Change per AFDM Change in net primary production per gram of ash-free dry mass over time The data provider -1 1 microgC/gAFDM/hr File name Original file name in which this information was submitted The data provider Original file name in which this information was submitted McMurdo Dry Valleys LTER The data distributor shall not be liable for innacuracies in the content http 1 0 \n 1 column , https://mcm.lternet.edu/sites/default/files/strmppvs.csv None 2015-01-20 2015-01-20 McMurdo Dry Valleys LTER http://mcmlter.org/ Biological Data Profile of the Content Standards for Digital Geospatial Metadata devised by the Federal Geographic Data Committee. 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