Oxidation of Thallium by Freshwater Plankton Communities

2003 ◽  
Vol 37 (12) ◽  
pp. 2720-2726 ◽  
Author(s):  
Benjamin S. Twining ◽  
Michael R. Twiss ◽  
Nicholas S. Fisher
Keyword(s):  
Freshwater Plankton ◽  
Plankton Communities

scholarly journals Complex Analyses of Plankton Structure and Function

2001 ◽  
Vol 1 ◽  
pp. 119-132 ◽  
Author(s):  
Karl E. Havens
Keyword(s):  
Size Structure ◽  
Experimental Studies ◽  
Structure And Function ◽  
Size Spectrum ◽  
Phytoplankton Productivity ◽  
Resource Managers ◽  
Carbon Transfer ◽  
And Function ◽  
Freshwater Plankton ◽  
Plankton Communities

This paper critically evaluates some complex methods that have been used to characterize the structure and function of freshwater plankton communities. The focus is on methods related to plankton size structure and carbon transfer. The specific methods reviewed are 1) size spectrum analysis, 2) size-fractionated phytoplankton productivity, 3) size-fractionated zooplankton grazing, 4) plankton ecological transfer efficiency, and 5) grazer effects on phytoplankton community structure. Taken together, these methods can provide information on community ecological properties that are directly related to practical issues including water quality and fisheries productivity. However, caution is warranted since application without a complete understanding of assumptions and context of the manipulations could lead to erroneous conclusions. As an example, experimental studies involving the addition or removal of zooplankton, especially when coupled with nutrient addition treatments, could provide information on the degree of consumer vs. resource control of phytoplankton. Resource managers subsequently could use this information in developing effective measures for controlling nuisance algal biomass. However, the experiments must be done critically and with sufficient safeguards and other measurements to ensure that treatments (e.g., zooplankton exclosure by screening of water) actually are successful and do not introduce other changes in the community (e.g., removal of large algae). In all of the methods described here, the investigator must take care when generalizing results and, in particular, carry out a sufficient number of replications to encompass both the major seasonal and spatial variation that occurs in the ecosystem.

scholarly journals Biomass Distribution in Freshwater Plankton Communities

1995 ◽  
Vol 146 (1) ◽  
pp. 135-152 ◽  
Author(s):  
Paul A. del Giorgio ◽  
Josep M. Gasol
Keyword(s):  
Biomass Distribution ◽  
Freshwater Plankton ◽  
Plankton Communities

scholarly journals Dynamics of biodegradable DOC produced by freshwater plankton communities

2000 ◽  
Vol 23 ◽  
pp. 73-83 ◽  
Author(s):  
M Søndergaard ◽  
NH Borch ◽  
B Riemann
Keyword(s):  
Freshwater Plankton ◽  
Plankton Communities

scholarly journals Effects of chloride and nutrients on freshwater plankton communities

2021 ◽  
Author(s):  
Danielle A. Greco ◽  
Shelley E. Arnott ◽  
Isabelle B. Fournier ◽  
Brandon S. Schamp
Keyword(s):  
Freshwater Plankton ◽  
Plankton Communities

Artificial Eutrophication Decrease Compositional Dissimilarity in Freshwater Plankton Communities

2021 ◽  
Author(s):  
Yun Li ◽  
Mengdie Geng ◽  
Jinlei Yu ◽  
Yingxun Du ◽  
Min Xu ◽  
...  
Keyword(s):  
Freshwater Plankton ◽  
Plankton Communities

Uptake of [14C]methylammonium by plankton communities: a comparative assay for ammonium transport systems in natural waters

1979 ◽  
Vol 25 (12) ◽  
pp. 1401-1407 ◽  
Author(s):  
Warwick F. Vincent
Keyword(s):  
Natural Waters ◽  
Competitive Inhibition ◽  
Eutrophic Lake ◽  
Transport Systems ◽  
Ammonium Transport ◽  
Transport Capacity ◽  
Diverse Range ◽  
Freshwater Plankton ◽  
Plankton Communities ◽  
Comparative Measure

A diverse range of freshwater plankton communities were tested for their ability to take up [14C]methylammonium. Uptake occurred at low substrate levels by high-affinity, energy-requiring, transport systems which were competitively inhibited by ammonium but not by L-amino acids or nicotinamide. A simple competitive inhibition model was used to examine the effects of increasing ammonium levels on uptake in a eutrophic lake. Apparent Kt values for the labelled substrate markedly increased with increasing ammonium. The transport systems had an approximately five-fold greater affinity for ammonium than for methylammonium. The Vmax for methylammonium uptake was relatively insensitive to large changes in ambient ammonium levels. This kinetic parameter may be a useful comparative measure of ammonium transport capacity in natural waters, particularly where low ambient ammonium concentrations preclude the use of 15N.

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