abundnce
English
utf8
dataset
McMurdo Dry Valleys LTER
http://mcmlter.org/
2014-11-04
ISO 19115-2 Geographic Information - North American Profile Metadata - Data with Biological Extensions
ISO 19115-2:2009(E)
Microzooplankton : Cryptophyte, Ciliate, and Heterotrophic Nanoflagellate Abundances
2014-11-04
publication
Johanna Laybourn-Parry
University of Bristol
University Road, Clifton Bristol BS8 1SS
Bristol
- None -
BS8 1S
GB
jo.laybourn-parry@bristol.ac.uk
pointOfContact
documentDigital
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 the abundance of heterotrophic nanoflagellates, cryptophytes, and ciliates found at various depths in Lake Fryxell and Lake Hoare.
Name: Inigo San Gil Role: data manager
completed
McMurdo Dry Valleys LTER
http://mcmlter.org/
unknown
The metadata was updated in 2016, some of the locations of the provenance files described below are no longer relevant. 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/emily.xls" and "/data1/data/lakes/plankton/laybourn-parry/ciliate.xls". 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.
population dynamics
theme
LTER Core Areas
English
The Lake Fryxell basin is formed by a moraine depression in a wider portion of the Taylor Valley. It has a number of moraine islands and shallower areas, as well as several relatively well developed deltas. The lake is fed by at least 10 meltwater streams with a total drainage catchment of 230 km2. The lake is dammed to the southwest by the Canada Glacier and is topographically closed. It is perennially ice covered; during summer months, an ice-free moat generally forms around much of the lake margin. Lake levels have risen ~2 m between 1971 and 1996. There are no surface outflows; the only known water loss is through ice ablation (evaporation, sublimation and physical scouring). Valley: Taylor Distance to Sea : 9 Maximum Length (km): 5.8 Maximum Width (km): 2.1 Maximum Depth (m): 20 Surface Area (km^2): 7.08 Ice Thickness Average Surface (m): 3.3 - 4.5 Volume (m^3 * 10^6): 25.2
163.259582519531
163.048782348633
-77.622711181641
-77.597076416016
Lake Hoare occupies a narrower portion of the Taylor Valley, dammed by the Canada Glacier. It would drain almost completely without this dam. There are a number of islands which may be related to an old terminal of Canada Glacier. The lake is fed primarily from direct runoff from the glacier, as well as meltwater streams. (Lake level rose ~1.5 m between 1972 and 1996). There are no surface outflows; the only known water loss is through ice ablation (evaporation, sublimation and physical scouring). Valley: Taylor Distance to Sea : 15 Maximum Length (km): 4.2 Maximum Width (km): 1 Maximum Depth (m): 34 Surface Area (km^2): 1.94 Ice Thickness Average Surface (m): 3.1 - 5.5 Volume (m^3 * 10^6): 17.5
162.935836791992
162.784423828125
-77.639259338379
-77.623085021973
ground condition
1996-10-27
1998-01-26
https://mcm.lternet.edu/sites/default/files/abundnce.csv
abundnce
eng; US
McMurdo Dry Valleys LTER
abundnce
Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 0 Orientation : Column Quote Character :
"Field Delimiter : ,
false
Location name
Name of lake where measurement was made
DATE_TIME
Date on which sample was gathered
Date Time Format: mm/dd/yyyy
DEPTH
Depth at which sample was drawn from lake
HNAN Abundance (#/ml)
Number of heterotrophic nanoflagellates/milliliter of lake water
Cryptophyte Abundance (#/ml)
Number of cryptophytes/milliliter of lake water
Ciliate Abundance (#/L)
Number of ciliates/liter of lake water
File Name
Name of file in which data was stored
DBF
https://mcm.lternet.edu/sites/default/files/abundnce.csv
dataset
The water column was sampled at the deepest point in each lake with a 2.21 Niskin bottle, through a hole drilled in thick ice cover (approximately 4m thick). Duplicate 60ml samples from each depth were fixed in buffered glutaraldehyde to a final concentration of 2% and stored in the dark at 4 degrees C prior to being analyzed. For HNAN and cryptophyte counts, 30-50ml of the sample was stained with DAPI, filtered onto a 2.0 m polycarbonate membrane filter and viewed under epifluorescence. Twenty Whipple grids were counted on each filter to determine mean abundance. For ciliates, duplicate 500 ml water samples were fixed in Lugol's iodine and concentrated by settling, prior to counting in a Sedgewick-Rafter counting chamber under phase microscopy at x160.
Metadata Access Constraints: none Metadata Use Constraints: none
annually
McMurdo Dry Valleys LTER
http://mcmlter.org/
pointOfContact