Vertical and seasonal variations of inorganic carbon allocation into macromolecules by phytoplankton population in a brown-colored and a clear-water lake

1995 ◽  
pp. 57-70
Author(s):  
Nadine Maurin ◽  
Christian Amblard ◽  
Gilles Bourdier
Keyword(s):  
Seasonal Variations ◽  
Inorganic Carbon ◽  
Carbon Allocation ◽  
Clear Water ◽  
Phytoplankton Population ◽  
Water Lake

Contrasting Trophic Level Interactions in Lake St. George and Haynes Lake (Ontario, Canada)

1991 ◽  
Vol 48 (3) ◽  
pp. 356-363 ◽  
Author(s):  
Nathalie Lafontaine ◽  
Donald J. McQueen
Keyword(s):  
Chlorophyll A ◽  
Trophic Level ◽  
Fish Population ◽  
Pelagic Fish ◽  
Strongly Correlated ◽  
Total Zooplankton ◽  
Clear Water ◽  
Southern Ontario ◽  
Water Lake ◽  
Pelagic Communities

Two small, adjacent kettle lakes in southern Ontario were sampled during spring and summer 1987. The data comprised weekly samples of zooplankton and water chemistry, monthly diel assessments of the densities of pelagic fish and zooplankton found at 1-m depth intervals in the water column, and an annual mark and recapture assessment of the entire fish population. The two lakes had very different community structures. Haynes Lake was characterized by high piscivore numbers, few planktivores, a relatively large assemblage of large bodied zooplankton, low chlorophyll a concentrations, and clear water. Lake St. George had a lower piscivore to planktivore ratio, smaller zooplankton, more chlorophyll a, and murkier water. Comparisons of trophic level biomasses for the two lakes suggested that in both communities, the relationships between piscivores and planktivores and between planktivores and zooplankton were strongly correlated with predator abundances. In the more oligotrophy community (Haynes Lake) this influence extended weakly to the phytoplankton, but in the more eutrophic system, little of the variability in chlorophyll a with respect to total phosphorus could be explained by total zooplankton (or Daphnia) abundance. This suggests that for freshwater pelagic communities, top-down effects may be stronger in more oligotrophic systems.

Temporal analysis of net fluvial methylmercury loading in a dystrophic and a clear water lake

2009 ◽  
Vol 407 (16) ◽  
pp. 4696-4702 ◽  
Author(s):  
R. Brad Mills ◽  
Tamar Bodek ◽  
Andrew M. Paterson ◽  
Jules M. Blais ◽  
David R.S. Lean
Keyword(s):  
Temporal Analysis ◽  
Clear Water ◽  
Water Lake

Benthic algae support zooplankton growth during winter in a clear-water lake

Oikos ◽  
2009 ◽  
Vol 118 (4) ◽  
pp. 539-544 ◽  
Author(s):  
Jan Karlsson ◽  
Christin Säwström
Keyword(s):  
Benthic Algae ◽  
Clear Water ◽  
Water Lake ◽  
Zooplankton Growth

scholarly journals Impact of environmental conditions on photosynthesis, growth and carbon allocation strategies of hypersaline species of Dunaliella

2013 ◽  
Vol 11 (1) ◽  
pp. 79-85
Keyword(s):  
Resource Utilization ◽  
Environmental Conditions ◽  
Metabolic Pathways ◽  
Inorganic Carbon ◽  
High Salinity ◽  
Carbon Allocation ◽  
Inorganic Ions ◽  
High Light ◽  
Hypersaline Environments ◽  
Allocation Strategies

Hypersaline environments pose a number of ecological and metabolic challenges to the organisms that live in them. Primary producers, such as halotolerant species of the green microalgal genus Dunaliella, are no exception. In this paper we focus on the problems posed to the acquisition and metabolism of inorganic nutrients and on the consequences of exposure to high light and UV radiation. We show that not only does growth in high salinity environments have repercussions on the flow of carbon into osmolytes such as glycerol, it also affects speciation of inorganic carbon and the uptake of inorganic ions by the cells. The strategies that Dunaliella adopt to optimize resource utilization and the interactions among metabolic pathways are also discussed.

Paleolimnological reflections of fiber-plant retting in the sediment of a small clear-water lake

Hydrobiologia ◽  
1986 ◽  
Vol 143 (1) ◽  
pp. 425-431 ◽  
Author(s):  
Elisabeth Gr�nlund ◽  
Heikki Simola ◽  
Pertti Huttunen
Keyword(s):  
Clear Water ◽  
Water Lake ◽  
Fiber Plant

scholarly journals Mercury methylation in the hypolimnetic waters of lakes with and without connection to wetlands in northern Wisconsin

2005 ◽  
Vol 62 (2) ◽  
pp. 400-411 ◽  
Author(s):  
C S Eckley ◽  
C J Watras ◽  
H Hintelmann ◽  
K Morrison ◽  
A D Kent ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Rate Constants ◽  
Methyl Mercury ◽  
The Other ◽  
Mercury Methylation ◽  
Clear Water ◽  
Depth Stratum ◽  
Water Lake ◽  
Stable Isotopic ◽  
Seepage Lake

Rates of Hg methylation and demethylation were measured in anoxic hypolimnetic waters of two pristine Wisconsin lakes using stable isotopes of Hg as tracers. One of the lakes is a clear-water seepage lake situated in sandy terrain with minimal wetland influence. The other is a dark-water lake receiving channelized inputs from a relatively large terrestrial wetland. Methyl mercury (MeHg) accumulated in the anoxic hypolimnia of both lakes during summer stratification, reaching concentrations of 0.8 ng·L–1 in the clear-water lake and 5 ng·L–1 in the dark-water lake. The stable isotopic assays indicated that rate constants of Hg(II) methylation (Km) ranged from 0.01 to 0.04·day–1 in the clear-water lake and from 0.01 to 0.09·day–1 in the dark-water lake, depending on the depth stratum. On average, Km was threefold greater in the dark-water lake. Hypolimnetic demethylation rate constants (Kdm) averaged 0.03·day–1 in the clear-water lake and 0.05·day–1 in the dark-water lake. These methylation rates were sufficient to account for the observed accumulation of MeHg in hypolimnetic water during summer in both lakes. Despite substantial export of MeHg from the wetland to the dark-water lake, our study indicates that in-lake production and decomposition of MeHg dominated the MeHg cycle in both lakes.

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