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Ice drills, tent, snowmobile, and a toboggan for gear facilitated sampling by the winter base crew
Site: Trout Lake
Date: January 1982
Photographer: P. Barbian
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Crayfish traps were modified minnow traps with the openings at each end increased in size to 7.6 cm. They were baited with chunks of thawed beef liver.
Site: Sparkling Lake
Date: 2001
Photographer: Brian Roth
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Installation of groundwater observation wells (piezometers). Galen J. Kenoyer on the left is aided by Carol Ptacek and Barbara Bickford on the right. Auger flights being added to the well string during drilling. Drilling rig was owned and operated by the Department of Geology and Geophysics. Well depths varied from a few to over 20 m in length.
Site: Near Crystal Lake
Date: Summer 1981
Photographer: Carl Bowser |
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A Dendy sampler that served as a colonization sampler for benthic insects, snails, and other invertebrates.
Date: 2004
Photographer: Tim Kratz |
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Set of seven vertical gill nets each with a different mesh size. Nets hang from the rollers to the lake bottom. They are held in place by anchors at each end of the set.
Date: Summer 1982
Photographer: John Magnuson |
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Fyke net was lifted and emptied of fish. Paisarn Sithigorngul is lifting the net showing the hoop areas where the fish are trapped. The hoops are connected to a net lead set perpendicularly from the shore. Weerawan Chulukasem is in the middle to measure the fish and John J. Magnuson is adjusting the boats position.
Site: Trout Lake
Date: 1982
Photographer: John Magnuson |
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Lake sediments being cored to obtain information on sponge spicules and the past biogeochemistry of the lake. Timothy K. Kratz is on the left; Tim Meinke is setting the drive rod of the piston corer; John Morrice on the right.
Site: Trout Lake area
Date: Winter 1989
Photographer: D. Schneider |
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Base limnological sampling with vertical plankton tow just completed by Ted Bier and Vicki Schwantes filtering water for chlorophyll analyses.
Site: Lake Mendota
Date: Summer 2003
Photographer: Jeff Miller, University of Wisconsin-Madison University Communications |
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Incubation tank for C14 primary production. Tim Meinke is placing light and dark bottles into the three channels that are at the temperature of the epilimnion, the metalimnion, and the hypolimnion. Each bottle contains lake water from one of those layers and is spiked with C14. Differences in uptake between the light and dark bottles at different temperatures and light levels are used to calculate primary production for the entire lake water column.
Site: Trout Lake Station
Date: 2004
Photographer: Tim Kratz |
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A beach seine is used by Karen Wilson and David Lewis to collect fishes for the College for Kids class.
Site: Lake Mendota
Date: Summer 2003
Photographer: Jeff Miller, University of Wisconsin-Madison University Communications |
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LTER base crews measuring physical, chemical, and plankton variables. Debi Fisk is measuring the volume pumped through a filter used to measure total particulate matter in the water column, and Joe Gressens is holding the Wisconsin net after taking a vertical tow for zooplankton. The elongated box to his left contains a 2 m long Schindler-Patalas style plankton trap that NTL-LTER designed and built.
Site: Allequash Lake
Date: July 2000
Photographer: Jeff Miller, University of Wisconsin-Madison University Communications |
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Base measurements of physical, chemical, and biological limnology being made by Pam Montz. A peristaltic pump on her right was used to collect the water for chemistry samples and was powered by the battery at her feet. Tubing coiled on top of the pump goes down into the lake to the sampling depths. The insulated box contained the Yellow Springs temperature/oxygen meter.
Site: Northern LTER lake
Date: Late winter about 1992
Photographer: Carl Bowser
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Opaque tubes were used to sample phytoplankton for measurements of C14 primary production. Tubes were assembled to the correct length to remove water from the epilimnion, the metalimnion, or the hypolimnion. Tim Meinke and Andy Juele are draining the water from the tube into a thermal cooler that excluded light and air.
Site: Crystal Lake
Date: Summer 1987
Photographer: University of Wisconsin Archives |
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Assessing the presence and abundance of aquatic species using a long-handled, double-headed rake. Susan Knight collects the sample while the driver, Dave Dreikosen (unseen), steers the boat to predetermined sampling sites using a GPS unit.
Site: Boot Lake, Vilas County, WI
Date: June 2007
Photographer: Dave Dreikosen |