uid=MCM,o=EDI,dc=edirepository,dc=org all public read Algal Species, Morphotype Descriptions Diane McKnight diane.mcknight@colorado.edu https://orcid.org/0000-0002-4171-1533 McMurdo Dry Valleys LTER http://mcmlter.org/ 2015-01-22 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 table contains descriptions of the morphotypes found for algal species belonging to the family Oscillatoriaceae. Morphotypes were based on physical characteristics.
algae morphotype phylum stream Station Keywords population dynamics LTER Core Areas
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https://mcm.lternet.edu/content/algal-species-morphotype-descriptions Descriptions for each morphotype were submitted on paper copies to the data manager at INSTAAR in August, 1997. These were entered into Microsoft Excel and transferred to the McMurdo LTER database. The ascii text, comma delimited file which was exported from Access generated the 'mrphtype.dat' file used on the web page. In July, 2000, a field for dataset code was added. This would simplify generating links between different data and metadata fields and assist in making the data more relational / useful in Oracle. McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER
In all, over thirty taxa of algae were identified in Taylor Valley streams. To allow for finer distinctions to be made concerning physical characteristics, species belonging to the family Oscillatoriaceae were divided into thirteen distinct morphotypes. These morphotypes were defined based on the following characteristics: trichome width, cell length, presence or absence of a calyptra (thickened membrane on the terminal cell, occurrence or otherwise of numerous trichomes within a common sheath, and shape of the apical cell. Each morphotype was then assigned to the species that most closely matched its description. In many cases, more than one morphotype was assigned to a single species. Morphotype L consisted of trichomes less than 2.5 micrometers in width, making them very difficult to distinguish at x400 magnification. As a result, two species of Oscillatoriales (Phormidium frigidum and Oscillatoria deflexa) were assigned to this particular morphotype.
mrphtype mrphtype.csv 8758 1 0 \n column , " https://mcm.lternet.edu/sites/default/files/mrphtype.csv Dataset code Dataset code Code representing algal species, morphotype description dataset string Code representing algal species, morphotype description dataset Family Family Algae Phylum string Algae Phylum Species Species genus, species string genus, species Morphotype Morphotype Letter assigned for species with characteristics summarized in description string Letter assigned for species with characteristics summarized in description Description Description Physical characteristics of species, morphotype string Physical characteristics of species, morphotype File name File name Original file name in which this information was submitted string Original file name in which this information was submitted