Acidification of Lake Annie, Highlands Co., FL

1992 ◽  
Vol 65 (1-2) ◽  
pp. 69-80 ◽  
Author(s):  
L. E. Battoe ◽  
E. F. Lowe
Keyword(s):  
Acidification Of Lake

Decline of Mysis relicta During the Acidification of Lake 223

1983 ◽  
Vol 40 (11) ◽  
pp. 1905-1911 ◽  
Author(s):  
R. W. Nero ◽  
D. W. Schindler
Keyword(s):  
Confidence Limits ◽  
Experimental Lakes Area ◽  
Mysis Relicta ◽  
Ph Values ◽  
Northwestern Ontario ◽  
Population Comparisons ◽  
Acidification Of Lake ◽  
Ph Range ◽  
Shield Lakes ◽  
Direct Toxicity

The population size of Mysis relicta in Lake 223 of the Experimental Lakes Area, northwestern Ontario, decreased from 6 700 000 ± 1 330 000 (± 95% confidence limits) during August of 1978, to 270 000 ± 75 000 during August of 1979, a 96% decrease. Because Mysis, a cold stenotherm, is restricted to the metalimnion and hypolimnion of lakes during summer, the pH range encountered by the population was 5.51 to 6.32 in 1978 and 5.23 to 6.10 in 1979, even though mean pH values in epilimnion waters for the 2 yr were 5.84 and 5.60. A decrease in pH of its habitat from 6.2 to 5.6 during fall overturn in 1979 caused the elimination of the remaining 4% of the population. Comparisons with four control lakes suggested that the decline and disappearance were not normal occurrences in unstressed lakes. Concentrations of Zn, Al, Mn, Fe, Cd, Cu, Ni, and Hg in Lake 223 water were low, and concentrations in Mysis were less than or equal to those in animals from five control lakes, suggesting that the decline in this species was not due to the toxic effects of metals. All size classes were affected, so that direct toxicity of hydrogen ion may be responsible for this abrupt population collapse. These results suggest that Mysis may be a useful early indicator of acidification damage to Precambrian Shield lakes.

Controlled experimental acidification of lake sediments and resulting trace metal behavior

1993 ◽  
Vol 69 (3-4) ◽  
pp. 393-403 ◽  
Author(s):  
J�rg Matschullat ◽  
Martina Wyrobek
Keyword(s):  
Trace Metal ◽  
Lake Sediments ◽  
Experimental Acidification ◽  
Acidification Of Lake

Reproductive Impairment of the Crayfish Orconectes virilis in Response to Acidification of Lake 223

1987 ◽  
Vol 44 (S1) ◽  
pp. s97-s106 ◽  
Author(s):  
Robert L. France
Keyword(s):  
Egg Production ◽  
Lake Acidification ◽  
Orconectes Virilis ◽  
Experimental Lakes Area ◽  
Rate Of Development ◽  
Northwestern Ontario ◽  
Reproductive Impairment ◽  
Cement Compound ◽  
Acidification Of Lake ◽  
Egg Capsule

Reproductive characteristics of crayfish (Orconectes virilis) were examined during 1979–81 in four small Canadian Shield basins in the Experimental Lakes Area, northwestern Ontario. One of these lakes, Lake 223 (L223), has been experimentally acidified since 1976. Egg resorption, fertilization, and rate of development were not seriously affected by lake acidification to pH 5.1. Incomplete hardening of the glair–cement compound forming the egg capsule membrane and stalk resulted in a loss of eggs from the pleopods, causing the L223 population to suffer decreased reproduction. On an egg production basis, the reproductive impairment (defined as the % decrease in number of viable eggs prior to hatching) in reference populations averaged 3.2 ± 1.8 (95% C.I.) compared to levels of 18.7, 36.2, and 29.4% during 1979–81 in L223 at pH 5.2–5.6. Direct mortality of eggs accounted for little of the reduced natality in the L223 population and did not occur in reference lakes. Loss of crayfish populations exposed to lake acidification will probably result from reproductive failure before lake water becomes acid enough to be directly toxic to mature crayfish.

Decreased Survival and Calcium Uptake by the Crayfish Orconectes virilis in Low pH

1980 ◽  
Vol 37 (3) ◽  
pp. 364-372 ◽  
Author(s):  
D. F. Malley
Keyword(s):  
Acid Rain ◽  
Lake Water ◽  
Calcium Uptake ◽  
Physiological Responses ◽  
Low Ph ◽  
Lake Acidification ◽  
Orconectes Virilis ◽  
Molt Cycle ◽  
Experimental Lakes Area ◽  
Acidification Of Lake

As part of a study of the effects of the experimental whole-lake acidification of Lake 223 in the Experimental Lakes Area on the population of the crayfish Orconectes virilis physiological responses of adults from this population to low pH were examined in the laboratory. Crayfish survived pH 4.0 for 10 d when they were not moulting but suffered mortality when they were in postmolt stages. Postmolt crayfish held at pH 5.0 for 10 d survived but showed slower progression of molt cycle stages and of calcification of the exoskeleton than individuals held at pH 6.0 or in lake water at about pH 6.7. Uptake of Ca++ by postmolt crayfish measured by the use of 45Ca as a tracer was inhibited by pH below 5.75 and ceased altogether below pH 4.0 when these levels of acidity were applied acutely.Key words: Orconectes virilis, crayfish, molt cycle, mortality, pH, calcification, postmolt calcium uptake, acid rain, lake acidification

Acidification of lake water due to drought

2014 ◽  
Vol 511 ◽  
pp. 484-493 ◽  
Author(s):  
L.M. Mosley ◽  
B. Zammit ◽  
A.M. Jolley ◽  
L. Barnett
Keyword(s):  
Lake Water ◽  
Acidification Of Lake

scholarly journals Factors influencing critical and target loads for the acidification of lake–watersheds in the Adirondack region of New York

2015 ◽  
Vol 124 (1-3) ◽  
pp. 353-369 ◽  
Author(s):  
Qingtao Zhou ◽  
Charles T. Driscoll ◽  
Timothy J. Sullivan ◽  
Afshin Pourmokhtarian
Keyword(s):  
New York ◽  
Factors Influencing ◽  
Acidification Of Lake

scholarly journals Identification of processes controlling chemical composition of pit lakes waters located in the eastern part of Muskau Arch (Polish-German borderland) / Identyfikacja procesów kształtujących skład chemiczny wód zbiorników zlokalizowanych na obszarach pogórniczych we wschodniej części Łuku Mużakowa (pogranicze polsko-niemieckie)

2015 ◽  
Vol 41 (3) ◽  
pp. 60-69 ◽  
Author(s):  
Sylwia Lutyńska ◽  
Krzysztof Labus
Keyword(s):  
Cluster Analysis ◽  
Chemical Composition ◽  
Water Regime ◽  
Mine Drainage ◽  
Speciation Analysis ◽  
Factor Analyses ◽  
Similar Chemical ◽  
Pit Lakes ◽  
Acidification Of Lake ◽  
Lake Waters

Abstract Exploitation of lignite within the area of Muskau Arch, carried out from the mid-nineteenth century, contributed to the transformation of the natural environment and changes in water regime. In the post-mining subsidences pit lakes were formed. The chemical composition of waters is a consequence of the intensive weathering of pyrite (FeS2), which is present in Miocene lignite-bearing rock forming the embankments of the lakes. This process leads to the formation of Acid Mine Drainage (AMD) and finally acidification of lake waters. This paper presents results of the identification of hydrogeochemical processes affecting the chemistry of waters from these reservoirs carried out using the speciation and statistical (cluster and factor) analyses. Cluster analysis allowed to separate from the analyzed group of anthropogenic reservoirs 7 subgroups characterized by a similar chemical composition of waters. The major processes affecting the chemistry of waters were identified and interpreted with help of factor and speciation analysis of two major parameters (iron and sulfur).

Experimental Acidification of Lake 223, Experimental Lakes Area: Background Data and the First Three Years of Acidification

1980 ◽  
Vol 37 (3) ◽  
pp. 342-354 ◽  
Author(s):  
D. W. Schindler ◽  
R. Wagemann ◽  
R. B. Cook ◽  
T. Ruszczynski ◽  
J. Prokopowich
Keyword(s):  
Sulfuric Acid ◽  
Sulfate Reduction ◽  
Dissolved Inorganic Carbon ◽  
Theoretical Calculations ◽  
Experimental Lakes Area ◽  
Manganese Zinc ◽  
Low Efficiency ◽  
Experimental Acidification ◽  
Acidification Of Lake ◽  
Iron Manganese

Sulfuric acid was used to add 1.60 eq∙m−2 of hydrogen ion ([H+]) to Lake 223 over a 3-yr period from 1976 to 1978, to simulate the effects of acid precipitation on chemical and biological characteristics of the lake. The pH of epilimnion water was lowered from 6.7 to 7.0 in 1976, to 6.0–6.2 in 1977, and to 5.7–5.9 in 1978. The effectiveness of acid addition at depleting alkalinity from the water column in the first 2 yr was 31–38%. As a result, the pH of the lake did not decrease as much as predicted from theoretical calculations. The low efficiency of acidification appeared to be due to generation of dissolved inorganic carbon (DIC) by sulfate reduction in anoxic regions of the hypolimnion. Sulfate reduction increased as addition of sulfuric acid caused the concentration of sulfate in the lake to increase. Mobilization of iron from hypolimnion sediments during anoxic periods caused DIC respired by decomposers to be accumulated as HCO3− to balance the Fe+2 charge, buffering against acidification of the lake. Most of the reduced sulfur was precipitated from the lake as FeS. As a result, H2S in the hypolimnion was usually undetectable. Concentrations of ammonia, iron, manganese, zinc, and aluminum were higher in 1977 than in 1976. The transparency of the lake increased, although there was no apparent change in chlorophyll, dissolved color, dissolved organic carbon, or primary production.Key words: lake acidification, acid rain, mass balance, water chemistry, sulfur cycling

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