uid=MCM,o=EDI,dc=edirepository,dc=org all public read algaerlc.dat Diane McKnight diane.mcknight@colorado.edu https://orcid.org/0000-0002-4171-1533 McMurdo Dry Valleys LTER http://mcmlter.org/ 2014-01-01 English

As part of the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, water was diverted to a relict stream channel in order to reactivate the streamflow. The purpose of this experiment was to quantify the time scales of response to the arrival of water after many years of dessication. This table contains data showing the percent of total biomass (abundance) represented by algal type (brown, red, orange or green), phylum, species and morphotype for the Relict Channel in the Fryxell basin.

abundance algae morphotype phylum stream Station Keywords population dynamics LTER Core Areas Further descriptions of the morphotypes in this file can be found in the 'Algal Species, Morphotype Descriptions' table

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-2224760). 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/algal-abundances-reactivated-channel Relict Channel at Site_2 163.249588012695 163.249588012695 -77.622131347656 -77.622131347656 1996-01-01 2000-12-31 Data from this table was initially included in the raw data files specified under the variable for 'file name'. These are Microsoft Excel version 6.0 files and can be found in the McMurdo LTER data manager's home directory on INSTAAR's Unix system. Once submitted to INSTAAR, the data manager combined all of the Relict Channel files that included variables for "abundance", and removed any variables that had no direct influence on the total biomass (abundance) of a given algal type, phylum, species, and morphotype. The resulting file is represented in the "algaerlc.dat" file used on the web page. In 2014, metadata was enhance during the adoption of the Drupal Ecological Information Management System (Inigo San Gil) 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. A maximum of five algal samples of each color were collected from each transect using a #13 cork borer (diameter = 17 mm, area = 227 square mm). Algal samples were preserved in 10% formalin forlaboratory identifications. Preserved algal samples were examined in the laboratory to determine species composition and relative abundance using a Nikon Diaphot phase contrast microscope. Samples were well mixed to attain an even (random) sampling of mat (some small "clumps" of algae were still present, but these did not affect the objectives of the study), and then subsamples of 2 ml were withdrawn. Each subsample was placed in a 2-ml settling chamber with a 26 mm diameter and examined at x400 magnification. To get a representative count of relative species abundance, seven random fields (a total of 0.44 square mm) needed to be examined per subsample. Within each field, algae were identified to genus and species where possible (excluding diatoms, which were counted but not identified.) Percent cover was determined in each field by measuring the length and width of all specimens using an ocular micrometer. Cell "depth" was also measured in order to estimate biovolume. All seven fields were then tallied, and the percentage of the total algal biomass was determined for each taxa. Taxonomic identifications were primarily based on the classical Antarctic literature.

algaerlc algaerlc.csv 17248 1 0 \n column , " https://mcm.lternet.edu/sites/default/files/algaerlc.csv Dataset code Dataset code Code representing Relict Channel experiment locations dataset string Code representing Relict Channel experiment locations dataset LOCATION_CODE Location Code Location code / name string Location code / name DATE_TIME Date Date of sample date mm/dd/yyyy ALGAE_TYPE Algal Type Type of algae speciesis associated with (red, brown, green or orange) string Type of algae speciesis associated with (red, brown, green or orange) Replicate Replicate# Replication number of sample string Replication number of sample Phylum Phylum Algal phylum string Algal phylum Species Species Algal species string Algal species Morphotype Morphotype Morphotype of species string Morphotype of species Abundance Abundance Percent of total biomass represented by algae type, phylum,species, morphotype dimensionless real File name File name Original file name in which this information was submitted string Original file name in which this information was submitted