Hypolimnetic methylmercury and its uptake by plankton during fall destratification: a key entry point of mercury into lake food chains?

Article Abstract:

Fall destratification appears to be a significant period for entry into the food chain of monomethylmercury (MMHg) in lakes with a hypolimnetic buildup of MMHg. Devil's Lake, WI, was the site of a study of mercury dynamics, with maximum concentrations of MMHg appearing close to the occurrence of complete mixis. Topics discussed include Hg concentration, Hg seasonal dynamics in biota fractions, Daphnia, planktivorous fish, and multiyear dynamics.

Wisconsin, Food chains (Ecology), Food chains, Methylmercury, Methylmercury compounds, Lakes, Mercury, Mercury (Metal), Plankton

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Summer water clarity responses to phosphorus, Daphnia grazing, and internal mixing in Lake Mendota

Article Abstract:

Water clarity in eutrophic Lake Mendota, Wisconsin, during the summer is affected by factors such as food web dynamics, phosphorus concentrations, and lake mixing. The research suggests that land use activities, food web dynamics and climate interact to determine summer water clarity. Food web dynamics affect grazing by Daphnia, whether the smaller-bodied Daphnia galeata mendotae or the larger-bodied pulicaria is dominant.

Summer, Freshwater zooplankton

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Predicting responses of chlorophyll and primary production to changes in phosphorus, grazing, and dissolved organic carbon

Article Abstract:

Chlorophyll and primary production responses to changes in phosphorus (P), grazing, and dissolved organic carbon and the prediction of those responses are discussed. Objections to extrapolation of results from experimental lakes to others, use of areal chlorophyll and use of P input rate vs use of surface-water concentrations, are disputed.

United States, Methods, Water, Water chemistry, Chlorophyll, Experimental design, Research design, Phytoplankton, Limnology, Dissolved oxygen

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