Biogeochemical cycling of PCBs in lakes of variable trophic status: a paired-lake experiment
Article Abstract:
Biogeochemical PCB cycling of PCB in lakes of different trophic status has been studied in a paired-lake experiment that used two remote, atmospherically driven lakes in the Experimental Lakes Area. The goal was to find out more about the stresses of trophic condition on air-water exchange and settling fluxes of PCBs. Hypothetically, eutrophic lakes would have access to the same PCB concentrations in the atmosphere as oligotrophic lakes and would gain more chemical mass through better air-water exchange. Net volatilization dominated in the ice-free period. Mass budgets indicate that the likely major PCB input was from the watershed. Results show intimate linkage of land, atmospheric and aquatic reservoirs of PCBs.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
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Resource competition in a discrete environment: why are plankton distributions paradoxical?
Article Abstract:
Plankton should be modeled as discrete particles rather than as continuous scalar fields. Principles of resource competition and competitive exclusion are not applicable under all natural conditions. In oligotrophic conditions, in which cell abundances are low and cells are small, nutrient competition is controlled by interactions of discrete individuals rather than populations. Discreteness in plankton populations also leads to a problem in ecological subgrid scale.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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