North Temperate Lakes
US Long-Term Ecological Research Network

Lake Mendota Microbial Observatory Secchi Disk Measurements 2012-present

Abstract
The Lake Mendota Microbial Observatory collects routine water clarity measurements
alongside their microbial samples. This dataset includes measurements of water clarity
collected at the central Deep Hole, collocated with a weather buoy (43°05'58.2"N
89°24'16.2"W). All measurements were collected with handheld Secchi discs. When multiple
personnel performed the Secchi disc measurements, the average and standard deviation are
reported. To take the Secchi depth, sunglasses are removed and the disc is lowered on the
shaded side of the boat. The Secchi depth is the average between where the Secchi disc
disappears while lowering it and where it reappears while raising it. Routine microbial
observatory sampling continues into the present.<br/>
Dataset ID
416
Date Range
-
LTER Keywords
Methods
Measurements are taken at the central deep hole of Lake Mendota (43.099500,
-89.404500). All measurements were collected with handheld black and white Secchi discs.
When multiple personnel performed the Secchi disc measurements, the average and standard
deviation are reported. To take the Secchi depth, sunglasses are removed and the disc is
lowered on the shaded side of the boat. The Secchi depth is the average between where the
Secchi disc disappears while lowering it and where it reappears while raising
it.<br/>
Related Sites
Version Number
1

Cascade project at Norther Temperate Lake LTER – Daily Respiration Data for Whole Lake Nutrient Additions 2013-2015

Abstract
Daily estimates of ecosystem respiration and values of covariates from surface waters of Paul, Peter, and Tuesday lakes from mid-May to early September for the years 2013, 2014, and 2015. Inorganic nitrogen and phosphorus were added to Peter and Tuesday lakes each year while Paul Lake was an unfertilized reference.<br/>
Core Areas
Dataset ID
399
Date Range
-
Methods
Nutrients were added to Peter and Tuesday lakes to cause algal blooms. Details on nutrient additions (start/end dates, loading rates, N:P ratios) are described in Wilkinson et al. 2018. (Ecological Monographs 88:188-203). Methods are described in Pace et al. 2021 (Limnology and Oceanography linked below), Wilkinson et al. 2018 (Ecological Monographs 88:188-203), and Pace et al. 2017 (Proceedings of the National Academy of Sciences USA 114: 352-357). These publications including supplements should be consulted for details.<br/>Nutrients were added to Peter and Tuesday lakes to cause algal blooms. Details on nutrient additions (start/end dates, loading rates, N:P ratios) are described in Wilkinson et al. 2018. (Ecological Monographs 88:188-203). Methods are described in Pace et al. 2021 (Limnology and Oceanography linked below), Wilkinson et al. 2018 (Ecological Monographs 88:188-203), and Pace et al. 2017 (Proceedings of the National Academy of Sciences USA 114: 352-357). These publications including supplements should be consulted for details.<br/>Nutrients were added to Peter and Tuesday lakes to cause algal blooms. Details on nutrient additions (start/end dates, loading rates, N:P ratios) are described in Wilkinson et al. 2018. (Ecological Monographs 88:188-203). Methods are described in Pace et al. 2021 (Limnology and Oceanography linked below), Wilkinson et al. 2018 (Ecological Monographs 88:188-203), and Pace et al. 2017 (Proceedings of the National Academy of Sciences USA 114: 352-357). These publications including supplements should be consulted for details.<br/>Nutrients were added to Peter and Tuesday lakes to cause algal blooms. Details on nutrient additions (start/end dates, loading rates, N:P ratios) are described in Wilkinson et al. 2018. (Ecological Monographs 88:188-203). Methods are described in Pace et al. 2021 (Limnology and Oceanography linked below), Wilkinson et al. 2018 (Ecological Monographs 88:188-203), and Pace et al. 2017 (Proceedings of the National Academy of Sciences USA 114: 352-357). These publications including supplements should be consulted for details.<br/>
Version Number
1
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National Science Foundation | LTER Network | Center for Limnology        

This material is based upon work supported by the National Science Foundation under Cooperative Agreement #DEB-2025982, NTL LTER (ROR: 04gq8q482). Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.