Acceptance and utilization of LTER data requires that:
FILE NAME: PRINCIPAL INVESTIGATOR: OTHERS: KEYWORDS: lake, heterotrophic, protozoa, microzooplankton, Antarctica, limnology
ABSTRACT: In conjunction with the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of
Antarctica, lakes were monitored for microzooplankton by a team based out of the University of Nottingham (led by Johanna
Laybourn-Parry). This dataset shows microzooplankton species found in Lake Fryxell.
VARIABLES: location, date, type of organism, species, comments
RESEARCH LOCATION: Samples were drawn from Lake Fryxell, a perennial ice-covered lake in the Taylor
Valley, Southern Victoria Land, Antarctica (77°S, 162°E). The lake has a maximum depth of
20m and is a permanently stratified meromictic lake with a conductivity of 1.2 to 2.0 mS/cm in the upper
mixomolimnion and 4.1 to 8.4 mS/cm in the lower anoxic monomolimnion. Water temperatures during the summer
range between 0.01°C and 2.7°C, with temperature increasing with depth. The chemocline is situated at 9.5m.
METHODS: The water column in Lake Fryxell was sampled at the deepest point in the lake with a 2.21
Niskin bottle, through a hole drilled in thick ice cover (approximately 4m thick). Samples were collected at 1m
intervals down to 13m. Duplicate 60ml samples from each depth were fixed in buffered glutaraldehyde to a final
concentration of 2% and stored in the dark at 4°C prior to being analyzed for bacteria, heterotrophic
nanoflagellates (HNAN) and phototrophic nanoflagellates (PNAN). This dataset provides a list of the
microzooplankton species represented in the lake water samples drawn to analyze
Lake Fryxell ciliates,
bacteria and nanoflagellates.
TIMING: Samples were gathered in January 1994.
CITATIONS: Roberts, Emily C. and Johanna Laybourn-Parry. 1998. Mixotrophic cryptophytes and their
predators in the Dry Valley lakes of Antarctica. Freshwater Biology. In Press.
COMMENTS:
STATUS: Restricted Access (Type IV).
VARIABLE DESCRIPTION:
VARIABLE TYPE DESCRIPTION UNITS MISSING VALUE INDICATOR MINIMUM MAXIMUM PRECISION Location Text Name of lake where measurement was made none Required entry n/a n/a n/a Date Date Date on which sample was gathered mmm-yyyy Required entry Jan-1992 Jan-1999 mm Type of Organism Text Category describing species none Required entry n/a n/a n/a Species Text Species found in lake None Null n/a n/a n/a Comments Text Helpful hints about the sample Null n/a n/a n/a LOG: Data for this file was submitted by Johanna Laybourn-Parry to
the data manager at INSTAAR on October 21, 1998. Files were sent via e-mail as well
as a hard copy. The original version of the file is stored on the Unix system in
"/data1/data/lakes/plankton/laybourn-parry/Species". Upon arrival at INSTAAR, the
data manager reformatted the file to present it in a relational mode. This
was done using Microsoft Access. It was then exported in comma delimited ascii and
MS-DOS text format to present on the web. Links to these files are provided above.
NOTE: Data contained in these files has been subjected to quality
control standards imposed by the investigator. The user of this data
should be aware that, while efforts have been taken to ensure that these
data are of the highest quality, there is no guarantee of perfection
for the data contained herein and the possibility of errors exists. If
you encounter questionable data, please contact the MCM LTER data manager
(; (303)492-4639) so that the data can be
corrected or qualified. Thus, these data may be modified and future
data will be appended.
none