Multiple stresses from a single agent: diverse responses to the experimental acidification of Little Rock Lake, Wisconsin

Article Abstract:

Diverse responses to experimental acidification of Little Rock Lake, Wisconsin, show that multiple stresses can come from a single agent. The lake underwent a single stress, a sulfuric acid acidification for a whole-ecosystem manipulation. The responses were wide-ranging. Increases in the concentrations of various chemicals and shifts in microbial processes occurred. There was a major increase in water clarity to UV-B radiation. Each of the changes could be thought of as a separate ecosystem stress distinct from the intended manipulation. A number of substantial changes in occurrence of organisms took place and a series of careful investigations shows underlying mechanisms are varied, but usually not directly attributable to acidification.

Wisconsin, Lake ecology, Limnology, Water acidification, Acid water pollution

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Dissolved inorganic carbon sources for epipelic algal production: sensitivity of primary production estimates to spatial and temporal distribution of 14C

Article Abstract:

Final distribution of carbon-14 was affected by preinoculation time and photosynthetic uptake, but the effect of photosynthesis was greater, in a study of epipelic cores from a lake bottom. An experiment was performed to estimate the uptake of dissolved inorganic carbon from interstitial water compared to overlying water. The results should improve estimates of primary production from epipelic algae.

Algae, Environmental aspects, Primary productivity (Biology), Carbon cycle (Biogeochemistry), Carbon cycle

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