‘Ghost fleas’ bring toxic mercury up from the depths of prairie lakes

Science ◽  
2020 ◽  
Author(s):  
Erik Stokstad
Keyword(s):  
Prairie Lakes

scholarly journals Effects of seasonal and interannual varibility in water isotopes (δ2H, δ18O) on estimates of water balance in a chain of seven prairie lakes

2021 ◽  
Vol 10 ◽  
pp. 100069
Author(s):  
H.A. Haig ◽  
N.M. Hayes ◽  
G.L. Simpson ◽  
Y. Yi ◽  
B. Wissel ◽  
...  
Keyword(s):  
Water Balance ◽  
Water Isotopes ◽  
Prairie Lakes ◽  
A Chain

Light, Nutrients, and Water Temperature as Determinants of Phytoplankton Production in Two Saline, Prairie Lakes with High Sulphate Concentrations

1992 ◽  
Vol 49 (11) ◽  
pp. 2281-2290 ◽  
Author(s):  
Richard D. Robarts ◽  
Marlene S. Evans ◽  
Michael T. Arts
Keyword(s):  
Water Temperature ◽  
Photosynthetic Capacity ◽  
Chlorophyll Concentration ◽  
Euphotic Zone ◽  
Dominant Factor ◽  
Phytoplankton Production ◽  
Dissolved Phosphorus ◽  
Prairie Lakes ◽  
The Mean ◽  
Algal Productivity

Our data support empirical models indicating that algal productivity is low relative to total phosphorus (TP) levels in prairie lakes with high sulphate concentrations. Mean chlorophyll accounted for 91.1% of the variance in euphotic zone primary production (ΣA) in Humboldt Lake (total dissolved solids (TDS) = 3.3 g∙L−1; Zmax = 6 m), while TP, total dissolved phosphorus, and water temperature accounted for 82.7% of ΣA variance in Redberry Lake (TDS = 20.9 g∙L−1; Zmax = 17 m). The relative importance of these variables to ΣA resulted from biological, chemical, and physical differences of these lakes. Light usually penetrated to the bottom of Redberry Lake due to a mean euphotic zone (Zeu) chlorophyll of 1.7 mg∙m−3, while Humboldt Lake's mean Zeu was 3.4 m with a mean chlorophyll concentration of 62.6 mg∙m−3. Chlorophyll was the dominant factor correlated with light penetration in Humboldt Lake (r2 = 0.65) but not in Redberry Lake. Photosynthetic capacity was correlated (r2 = 0.72) with water temperature only in Redberry Lake. The mean ΣA was 57.1 and 230.2 mg C∙m−2∙h−1 for Redberry and Humboldt lakes, respectively.

scholarly journals Resource‐use, body condition and parasite load metrics indicate contrasting health of stocked and native game fishes in Canadian prairie lakes

2020 ◽  
Vol 28 (1) ◽  
pp. 18-27
Author(s):  
Lushani Nanayakkara ◽  
Elizabeth R. Starks ◽  
Ryan N. Cooper ◽  
Sydney Chow ◽  
Peter R. Leavitt ◽  
...  
Keyword(s):  
Body Condition ◽  
Resource Use ◽  
Parasite Load ◽  
Canadian Prairie ◽  
Prairie Lakes

Relationship Between Thermal Stability and Summer Oxygen Depletion in a Prairie Pothole Lake

1980 ◽  
Vol 37 (9) ◽  
pp. 1433-1438 ◽  
Author(s):  
M. H. Papst ◽  
J. A. Mathias ◽  
J. Barica
Keyword(s):  
Thermal Stability ◽  
Air Temperature ◽  
Algal Biomass ◽  
Thermal Instability ◽  
Oxygen Depletion ◽  
Prairie Pothole ◽  
Night Time ◽  
Algae Blooms ◽  
Principal Factors ◽  
Prairie Lakes

Periods of summer oxygen depletion (summerkill), occurring in shallow prairie lakes, are dependent on the collapse of algae blooms but are not an obligatory result of the collapse. A period of thermal instability following this bloom collapse, or coincidental with it, is a necessary requirement. Wind stress and night-time air temperature are the principal factors determining the degree of thermal stability. These findings explain the speed with which oxygen depletion can occur, that the occurrence of algal biomass collapses without severe oxygen depletion (partial collapses), and the correlation between the occurrence of periods of lake oxygen depletion and changing weather conditions.Key words: lake, summerkill, anoxia, mixing, oxygen depletion, thermal stability, weather, Aphanizomenon

Factors Controlling Oxygen Depletion in Ice-Covered Lakes

1980 ◽  
Vol 37 (2) ◽  
pp. 185-194 ◽  
Author(s):  
Jack A. Mathias ◽  
Jan Barica
Keyword(s):  
Volume Ratio ◽  
Lake Management ◽  
Eddy Diffusion ◽  
Oxygen Depletion ◽  
Eutrophic Lakes ◽  
Experimental Lakes Area ◽  
Lake Volume ◽  
Basin Morphometry ◽  
Depletion Rate ◽  
Prairie Lakes

Winter oxygen depletion rates from four sets of Canadian lakes (prairie, southeastern Ontario, Arctic, and Experimental Lakes Area) differing in morphometry and trophic state, were analyzed. An inverse relationship was found between oxygen depletion rate and mean depth. The effect of lake trophic status on oxygen depletion rate was demonstrable after the influence of basin morphometry was removed by regression of oxygen depletion rate against the sediment area: lake volume ratio. The sediments of eutrophic lakes consumed oxygen about 3 times faster (0.23 g∙m−2∙d−1) than those of oligotrophic lakes (0.08 g∙m−2∙d−1), but water column respiration was about the same (0.01 g∙m−3∙d−1) for both groups of lakes. Data from prairie lakes showed that the winter oxygen consumption was limited by oxygen supply below an average whole-lake oxygen concentration of 3.8 mg∙L−1. The rate of eddy diffusion near the sediments in ice-covered prairie lakes was 3.72 ± 1.41 × 10−3 cm2∙s−1. Implications for lake management during the winter are discussed.Key words: oxygen, depletion, respiration, lakes, ice-covered, winter, sediments, model, consumption

Secondary Production of Tiger Salamanders (Ambystoma tigrinum) in Three North Dakota Prairie Lakes

1988 ◽  
Vol 45 (4) ◽  
pp. 691-697 ◽  
Author(s):  
Mark R. Deutschman ◽  
John J. Peterka
Keyword(s):  
Secondary Production ◽  
Ambystoma Tigrinum ◽  
Invertebrate Predation ◽  
Overwinter Survival ◽  
Maximum Biomass ◽  
Tiger Salamanders ◽  
Prairie Lakes ◽  
Wet Weight ◽  
Young Of The Year ◽  
Salamander Larvae

In three prairie lakes studied in 1981–82, larval tiger salamander (Ambystoma tigrinum) densities reached highs of 5000∙ha−1, maximum biomass (wet weight) was 180 kg∙ha−1, and maximum annual production was 565 kg∙ha−1. Within a given lake, overwinter survival of larvae varied markedly from year to year. Overwinter survival of larvae was excellent in Lake II; in spring 1981, densities were 800–1000∙ha−1. In 1982, no larvae overwintered in Lake II, and none overwintered in Lake I in either 1981 or 1982. In May 1981, larvae were large (mean weight of 150 g) and their biomass of 150 kg∙ha−1 was nearly as large as the maximum biomass of 160 kg∙ha−1 in late July of larvae from the year's cohort. This was in contrast with 1982 in Lake II and with both 1981 and 1982 in Lake I when there was an extremely low biomass in the spring, composed of many small larvae. The large larvae that overwintered in Lake II in 1981 did not prey on young-of-the-year larvae; their high densities may have actually reduced invertebrate predation on salamander larvae; in July, larval salamander densities of 5000∙ha−1 were the highest measured.

Oxygen Depletion and Winterkill Risk in Small Prairie Lakes Under Extended Ice Cover

1979 ◽  
Vol 36 (8) ◽  
pp. 980-986 ◽  
Author(s):  
Jan Barica ◽  
John A. Mathias
Keyword(s):  
Dissolved Oxygen ◽  
Average Rate ◽  
Oxygen Depletion ◽  
Oxygen Storage ◽  
Lake Depth ◽  
Fish Kill ◽  
Initial Oxygen ◽  
Storage Rate ◽  
Prairie Lakes ◽  
The Mean

Mean rates of dissolved oxygen depletion in 10 shallow eutrophic prairie lakes (area 2.3–27.3 ha, mean depth 1.6–4.2 m), ranged from 0.22 to 0.34 g/m2∙d−1 for nonstratified lakes and 0.32–0.42 g/m2∙d−1 for stratified ones. An average rate for all lakes was 0.29 ± 0.06 g/m2∙d−1. The rates correlated with the lake depth. A method for estimating the winterkill risk on the basis of initial oxygen storage, rate of dissolved oxygen depletion and/or the mean or maximum lake depth is proposed. Key words: prairie lakes, oxygen depletion rates, winter fish kill, eutrophication, metabolism, oxygen storage

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