scholarly journals Effects of changes in reservoir operations on water quality and trophic state indicators in Voyageurs National Park, northern Minnesota, 2001-03

2004 ◽  
Author(s):  
Victoria G. Christensen ◽  
G.A. Payne ◽  
Larry W. Kallemeyn
Keyword(s):  
Water Quality ◽  
National Park ◽  
Trophic State ◽  
Reservoir Operations ◽  
Voyageurs National Park

scholarly journals Trophic State Evaluation of Jackson Lake in Grand Teton National Park

1997 ◽  
Vol 21 ◽  
pp. 39-41
Author(s):  
Woodruff Miller
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
National Park ◽  
Trophic State ◽  
Health Department ◽  
Nutrient Concentrations ◽  
Grand Teton National Park ◽  
State Evaluation ◽  
June July

This study is the continuation of an evaluation of the trophic state of lakes located in Grand Teton National Park, Wyoming. The original 1995 study was motivated by concern that the water quality of the lakes within the Park may be declining due to increased human usage over the past several years. A trophic state evaluation, featuring nutrient and chlorophyll-a analyses, was chosen because it is believed to be a sound indicator of the lakes' overall water quality. In this 1996 study, a thorough evaluation was made of Jackson Lake. This summary is taken from the complete 100 page report which is available from Woodruff Miller at Brigham Young University or Hank Harlow at the University of Wyoming. In most cases water samples were taken four times during the summer of 1996, in June, July, August, and October. Jackson Lake was sampled at eight different locations on thesurface and at depths near the bottom. The lake inlet and outlet were also sampled four times. Jackson Lake was sampled from a motor boat which also provided a means to measure the lake transparency and depth. The chlorophyll-a and nutrient concentrations were analyzed by the Utah State Health Department, Division of Laboratory Services. Jackson Lake was evaluated using the models of Carlson, Vollenweider, and Larsen­Mercier. The nature of the Larsen-Mercier and Vollenweider models, based on system inflow and outflow data, is such that they yield one trophic state assessment of the lake per inflow and outflow sample set. The Carlson Trophic State Indices (TSI), on the other hand, are based on in situ properties of the water at any point in the lake. Consequently, while there are four Vollenweider and four Larsen-Mercier evaluations for Jackson Lake, individual Carlson evaluations were made for the eight sample sites around the lake at the surface and at depth, and an evaluation for the lake as a whole was constructed using averages taken from the site evaluations. This allowed us to examine the relative water quality of different portions of the lake at different time periods.

scholarly journals Trophic State Evaluation of Jackson Lake in Grand Teton National Park

1996 ◽  
Vol 20 ◽  
pp. 63-67
Author(s):  
Woodruff Miller
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
National Park ◽  
Trophic State ◽  
Health Department ◽  
Nutrient Concentrations ◽  
Grand Teton National Park ◽  
State Evaluation ◽  
June July

This study is the continuation of an evaluation of the trophic state of lakes located in Grand Teton National Park, Wyoming. The original 1995 study was motivated by concern that the water quality of the lakes within the Park may be declining due to increased human usage over the past several years. A trophic state evaluation, featuring nutrient and chlorophyll-a analyses, was chosen because it is believed to be a sound indicator of the lakes' overall water quality. In this 1996 study, a thorough evaluation was made of Jackson Lake. This summary is taken from the complete 100 page report which is available from Woodruff Miller at Brigham Young University or Hank Harlow at the University of Wyoming. In most cases water samples were taken four times during the summer of 1996, in June, July, August, and October. Jackson Lake was sampled at eight different locations on the surface and at depths near the bottom. The lake inlet and outlet were also sampled four times. Jackson Lake was sampled from a motor boat which also provided a means to measure the lake transparency and depth. The chlorophyll-a and nutrient concentrations were analyzed by the Utah State Health Department, Division of Laboratory Services. Jackson Lake was evaluated using the models of Carlson, Vollenweider, and Larsen-Mercier. The nature of the Larsen-Mercier and Vollenweider models, based on system inflow and outflow data, is such that they yield one trophic state assessment of the lake per inflow and outflow sample set. The Carlson Trophic State Indices (TSI), on the other hand, are based on in situ properties of the water at any point in the lake. Consequently, while there are four Vollenweider and four Larsen-Mercier evaluations for Jackson Lake, individual Carlson evaluations were made for the eight sample sites around the lake at the surface and at depth, and an evaluation for the lake as a whole was constructed using averages taken from the site evaluations. This allowed us to examine the relative water quality of different portions of the lake at different time periods.

scholarly journals Lake levels and water quality in comparison to fish mercury body burdens, Voyageurs National Park, Minnesota, 2013–15

2017 ◽  
Author(s):  
Victoria G. Christensen ◽  
James H. Larson ◽  
Ryan P. Maki ◽  
Mark B. Sandheinrich ◽  
Mark E. Brigham ◽  
...  
Keyword(s):  
Water Quality ◽  
National Park ◽  
Lake Levels ◽  
Voyageurs National Park

scholarly journals Trophic State Evaluation for Selected Lakes in Yellowstone National Park

2003 ◽  
Vol 27 ◽  
pp. 53-68
Author(s):  
Woodruff Miller
Keyword(s):  
Water Quality ◽  
Yellowstone National Park ◽  
National Park ◽  
Trophic State ◽  
Monitoring Methods ◽  
Short Term ◽  
Annual Average ◽  
Yellowstone Lake ◽  
Natural Processes ◽  
State Evaluation

The purpose of this study was to tentatively classify the trophic level for selected lakes, except Yellowstone Lake, in Yellowstone National Park. This paper also documents the monitoring methods and perspectives used in this study as meeting current acceptable practice. For selected lakes in Yellowstone National Park, phosphorus, nitrogen, chlorophyll-a, and other lake characteristics were studied to identify short­term lake behavior and to classify the annual average trophic state of the lakes. By studying short-term lake behavior, there may be a greater understanding of how the trophic state of a lake can be averaged annually. Both the annual average trophic state and short-term lake behavior may help to understand the longer term trophic state of a lake. There is concern that natural processes and human activity on and around the lakes are causing the water quality to decline. We were unable to find any previous studies that defined the trophic state of the lakes. Therefore, an objective of this study is to evaluate the current trophic state of the lakes and develop a preliminary baseline to which future evaluations can be compared. This study has provided a benchmark trophic state survey not only for comparison to future evaluations, but to identify possible areas of concern. The greater the trophic state, the greater the level of eutrophication that has taken place. As lakes advance in the eutrophication process, water quality generally decreases.

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