Data set creator(s): Pieter Johnson
For data content questions, contact Niwot LTER data manager
For methodology questions, contact Kelly Loria
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Starting in 2012 zooplankton sampling at Green Lake 4 was included in the long term monitoring data set at Niwot Ridge.
Immediately after the ice has completely melted from the lakes, zooplankton samples are taken once a week for six consecutive weeks at the deepest portion of the lake from an inflatable raft. Zooplankton were sampled at the deepest location of each lake by pulling a conical net (Wisconsin net) vertically through the water column (i.e., vertical tow sample).
Green Lake 4:
Elevation 3584 m
2012-7-3 to ongoing
weekly during ice-free season
depth, net mesh size, amount sampled, taxonomic identification, number of counted taxon, taxon density, average length, total counted for length, total density
Green Lake 4
Elevation: 3550 m
Green Lakes Valley (City of Boulder Watershed)
Located in: City of Boulder Watershed
(Click to learn more about these locations)
More data from: Green Lake 4
Core Data Set: yes Core Area: Populations
Discipline: Animal ecology, Limnology
Award Or Grant: DEB1637686
The Wisconsin net used for zooplankton sampling is 0.9m long with an opening of an inner diameter of 0.2m and a mesh size of 80um.
The vertical tow samples are taken from approximately 0.5 m off the lake bottom. After the net is raised and the sides rinsed, the sample is transferred to a 250 mL jar and preserved in a solution of 80% Ethanol.
Jars are labeled with date (mm/dd/yyy), time hh:mm (MST), lake, depth and net details and stored at room temperature until analysis.
For each zooplankton sample obtained, organisms were identified to species, or lowest taxonomic level (Chydoridae sp. and Bosminidae sp.) and enumerated in separate 10-mL subsamples obtained by a Hensen-Stempel pipette.
Subsamples were taken directly from the sample jar after inverting the sample several times to homogenize its contents (sample volume 250 mL), transferred to a gridded dissection tray and counted using a stereomicroscope (Olympus SZX10).
Individual body lengths of the first 50 -100 (when possible) individuals of each taxon were recorded using a calibrated eyepiece micrometer.
Calanoid and cyclopoid copepodites were counted together as nauplii.
Data entered are based on the data recorded during sample analysis.
This method assumes 100% efficiency of our net:
r = radius of opening of zooplankton net
l = length of combined tow
p= percent of sample analyzed
zooplankton, community composition, length, size, abundance, density, net, Daphnia pulicaria, neonate, Hesperodiaptomus shoshone, nauplii, Bosminidae, Chydoridae, cladoceran, copepod, Green Lake 4, Niwot Ridge LTER, NWT, long term
COL1. label=LTER_site, type=string, units=none, missing value indicator=none, minimum=NWT, maximum=NWT, precision=, definition=Niwot Ridge LTER site
COL2. label=local_site, type=string, units=none, missing value indicator=none, minimum=GL4, maximum=GL4, precision=, definition=Green Lake 4
COL3. label=year, type=integer, units=none, missing value indicator=NaN, minimum=2012, maximum=, precision=1, definition=year (yyyy) sampled was collected
COL4. label=date, type=string, units=none, missing value indicator=none, minimum=2012-07-03, maximum=, precision=, definition=date (yyyy-mm-dd) sample was collected
COL5. label=depth, type=real, units=meter, missing value indicator=NaN, minimum=6, maximum=13.5, precision=, definition=tow length - depth to which Wisconsin net was deployed
COL6. label=net_um, type=real, units=micrometer, missing value indicator=NaN, minimum=80, maximum=80, precision=, definition=Wisconsin net mesh size
COL7. label=water_sampled, type=real, units=liter, missing value indicator=NaN, minimum=, maximum=, precision=, definition=amount of water sampled
COL8. label=taxon_name, type=string, units=none, missing value indicator=NaN, minimum=, maximum=, precision=, definition=species name/other taxonomic identification for group measured
COL9. label=num_of_taxon, type=integer, units=none, missing value indicator=NaN, minimum=, maximum=, precision=, definition=number of individuals counted for taxon group measured
COL10. label=taxon_dens , type=real, units=numberPerLiter, missing value indicator=NaN, minimum=, maximum=, precision=, definition=density of taxon group measured
COL11. label=avg_taxon_length, type=real, units=millimeter, missing value indicator=NaN, minimum=, maximum=, precision=, definition=average length (size) of taxon group measured
COL12. label=tot_indiv_meas, type=integer, units=none, missing value indicator=NaN, minimum=, maximum=, precision=, definition=number of counted individuals used to calculate average taxon length
COL13. label=tot_density, type=real, units=none, missing value indicator=NaN, minimum=, maximum=, precision=, definition=density of all individual plankton measured in sample
*Note: To ask a question about data content, please contact the data manager HERE
To ask a question about methodology, please contact Kelly Loria,
The documentation for this data set was developed from information provided by Kelly Loria.[HCH 24 November 2017]
Johnson, Pieter. 2018. Zooplankton community composition data for Green Lake 4 from 2012-7-3 to ongoing, weekly during ice-free season. http://niwot.colorado.edu
This material is based upon work supported by the National Science Foundation under Cooperative Agreement #DEB-1637686. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necesarily reflect the views of the National Science Foundation.
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