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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
Data Policies
This data package is released under the Creative Commons Attribution 4.0 International License (CC BY 4.0; http://creativecommons.org/licenses/by/4.0/), which allows consumers (hereinafter referred to as “Data Users”) to freely reuse, redistribute, transform, or build on this work (even commercially) so long as appropriate credit is provided. Accordingly, Data Users are required to properly cite this data package in any publications or in the metadata of any derived products that result from its use (in whole or in part). A recommended citation is provided on the summary metadata page associated with this data package in the McMurdo Dry Valleys LTER Data Catalog (https://mcmlter.org/data), and a generic citation may be found on the summary metadata page in the repository where this data package was obtained. When these data contribute significantly to the contents of a publication, Data Users must also acknowledge that data were provided by the NSF-supported McMurdo Dry Valleys Long Term Ecological Research program (OPP-1637708). This data package has been released in the spirit of open scientific collaboration. Hence, Data Users are strongly encouraged to consider consultation, collaboration, and/or co-authorship (as appropriate) with the data package creator(s). Data Users should be aware these data may be actively used by others for ongoing research; thus, coordination may be necessary to prevent duplicate publication. Data Users should also recognize that misinterpretation of data may occur if they are used outside the context of the original study. Hence, Data Users are urged to contact the data package creator(s) if they have any questions regarding methodology or results. While substantial efforts are made to ensure the accuracy of this data package (with all its components), complete accuracy cannot be guaranteed. Periodic updates to this data package may occur, and it is the responsibility of Data Users to check for new versions. This data package is made available “as is” and comes with no warranty of accuracy or fitness for use. The creator(s) of this data package and the repository where these data were obtained shall not be liable for any damages resulting from misinterpretation, use, or misuse of these data. Finally, as a professional courtesy, we kindly request Data Users notify the primary contact referenced in the metadata when these data are used in the production of any derivative work or publication. Notification should include an explanation of how the data were used, along with a digital copy of the derived product(s). Thank you.
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
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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