Variation of hepatic enzymes in three species of freshwater fish from precambrian shield lakes and the effect of cadmium exposure

1993 ◽  
Vol 104 (1) ◽  
pp. 147-154 ◽  
Author(s):  
V.P. Palace ◽  
J.F. Klaverkamp
Keyword(s):  
Freshwater Fish ◽  
Cadmium Exposure ◽  
Hepatic Enzymes ◽  
Precambrian Shield ◽  
Shield Lakes

Chemical and Biological Changes in Nelson Lake, Ontario Following Experimental Elevation of Lake pH

1977 ◽  
Vol 12 (1) ◽  
pp. 213-232 ◽  
Author(s):  
N.D. Yan ◽  
W.A. Scheider ◽  
P.J. Dillon
Keyword(s):  
Heavy Metal ◽  
Lake Ontario ◽  
Background Concentrations ◽  
Precambrian Shield ◽  
Metal Levels ◽  
Zooplankton Communities ◽  
Shield Lakes

Abstract Intensive studies of Nelson Lake, a Sudbury area lake of intermediate pH ~5.7), were begun in 1975. The chemistry of the lake was typical of that of most PreCambrian Shield lakes except that low alkalinities and high sulphate concentrations were observed along with elevated heavy metal levels. After raising the pH of Nelson Lake to 6.4 by addition of Ca(OH)2 and CaCO3, the metals were reduced to background concentrations. Phytoplankton and Zooplankton communities, which at pH of 5.7 were typical of PreCambrian lakes, were not affected by the experimental elevation of lake pH.

Assessment of benthic algal biomonitoring protocols to evaluate effects of shoreline development on the nearshore zone of Precambrian Shield lakes in Ontario

2011 ◽  
Vol 27 (4) ◽  
pp. 398-413 ◽  
Author(s):  
Kathryn E. Thomas ◽  
Amy Kluke ◽  
Roland I. Hall ◽  
Andrew M. Paterson ◽  
Jennifer G. Winter
Keyword(s):  
Nearshore Zone ◽  
Shoreline Development ◽  
Precambrian Shield ◽  
Shield Lakes

Comparative Survival and Growth of Planted Wild, Hybrid, and Domestic Strains of Brook Trout (Salvelinus fontinalis) in Ontario Lakes

1981 ◽  
Vol 38 (12) ◽  
pp. 1672-1684 ◽  
Author(s):  
J. M. Fraser
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Wild Strain ◽  
Catostomus Commersoni ◽  
Precambrian Shield ◽  
Wild Hybrid ◽  
Wild Strains ◽  
Competitive Species ◽  
Survival And Growth ◽  
Shield Lakes

Matched plantings of domestic strain and interstrain hybrid (or wild strain) brook trout (Salvelinus fontinalis) were made annually in nine small Precambrian Shield lakes during 1973–77. Recoveries of planted fish were made by gillnetting and/or angling during 1974–80. In six study lakes, hybrids (and wild strains) were recovered at rates two to four times greater than the domestic strain; in three lakes recoveries were similar. Most domestic strain trout were caught in the year following planting whereas recoveries of hybrids and wild strains were spread over 3–4 yr. Each kilogram of hybrid (or wild) planted yielded 5.6 kg (1.2–12.3); each kilogram of domestic strain planted yielded 0.8 kg (0.2–2.1). Lakes containing only minnows and sticklebacks yielded the highest returns of brook trout; lakes containing competitive species yielded low returns. Rapid growth of brook trout occurred in lakes containing only minnows and sticklebacks; slowest growth was noted in lakes supporting white suckers (Catostomus commersoni). Domestic strain brook trout and the matched hybrid grew at approximately the same rate within a lake and in seven of the nine lakes ate the same food. The performance of the Nipigon × domestic hybrid qualifies it for consideration as a replacement for the domestic brook trout presently planted in Ontario lakes.Key words: planting, brook trout, trout strain, hybrid, Precambrian Shield, survival, stock

Crustacean Zooplankton Communities and Lake Morphometry in Precambrian Shield Lakes

1994 ◽  
Vol 51 (11) ◽  
pp. 2424-2434 ◽  
Author(s):  
W. Keller ◽  
M. Conlon
Keyword(s):  
Species Richness ◽  
Maximum Depth ◽  
Crustacean Zooplankton ◽  
Small Fish ◽  
Lake Area ◽  
Lake Depth ◽  
Lake Morphometry ◽  
Precambrian Shield ◽  
Zooplankton Communities ◽  
Shield Lakes

To investigate relationships between crustacean zooplankton communities and lake morphometry we sampled 60 near-neutral Precambrian Shield lakes, including many small, shallow lakes. Morphometry-related patterns in the distributions of many zooplankton species were evident. Lake depth determined the occurrence of hypolimnetic species, and lake depth, lake area, and watershed area were positively related to the species richness of zooplankton communities. Among lakes with fish, deeper (maximum depth >8 m) lakes were characterized by greater species richness, higher abundances of a number of species including Daphnia pulex, Daphnia galeata mendotae, Daphnia dubia, and Diacyclops bicuspidatus thomasi, and lower abundances of Leptodiaptomus minutus, than shallower (maximum depth <8 m) lakes. Increased predation pressure by small fish species in smaller, shallower lakes probably influenced the observed species distributions. Lakes inferred to be fishless based on the presence of Chaoborus americanus typically had relatively high abundances of D. pulex, Diaphanosoma brachyurum, and Aglaodiaptomus leptopus, and absences of D. g. mendotae and D. birgei, patterns attributable to intense invertebrate predation on zooplankton.

Effects of Manipulations of Aluminum Concentrations and pH on Phosphate Uptake and Photosynthesis of Planktonic Communities in Two Precambrian Shield Lakes

1985 ◽  
Vol 42 (12) ◽  
pp. 1946-1953 ◽  
Author(s):  
C. Nalewajko ◽  
B. Paul
Keyword(s):  
Water Samples ◽  
Phosphate Uptake ◽  
Physiological Responses ◽  
Precambrian Shield ◽  
Shield Lakes ◽  
Plastic Lake ◽  
Direct Toxicity ◽  
Planktonic Communities

From June 1982 to October 1983 we studied the physiological responses of phytoplankton to aluminum perturbations in a circumneutral lake (St. Nora Lake) and an acid-stressed lake (Plastic Lake) on the Precambrian Shield in Ontario. In both lakes, addition of aluminum to water samples decreased microbial phosphate uptake and photosynthesis; significant decreases occurred at 50 μg Al∙L−1. Both processes were affected more at pH 5.2–6.9 than at pH 4.5, phosphate uptake was depressed relatively more than photosynthesis, and depression of both processes was larger in Plastic Lake than in St. Nora Lake. Precipitation of phosphate as particles > 0.45 μm upon addition of aluminum, as well as direct toxicity of aluminum, appear to be responsible for the observed detrimental effects of aluminum.

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