Alteration of phytoplankton phosphorus status during enrichment experiments: implications for interpreting nutrient enrichment bioassay results

Hydrobiologia ◽  
1986 ◽  
Vol 133 (3) ◽  
pp. 217-222 ◽  
Author(s):  
James J. Elser ◽  
Bruce L. Kimmel
Keyword(s):  
Nutrient Enrichment ◽  
Phosphorus Status ◽  
Enrichment Experiments

Phytoplankton responses to nutrient and grazer manipulations among northeastern lakes of varying pH

1998 ◽  
Vol 55 (4) ◽  
pp. 958-966 ◽  
Author(s):  
Paul Bukaveckas ◽  
William Shaw
Keyword(s):  
Phosphatase Activity ◽  
Nonlinear Model ◽  
Nutrient Enrichment ◽  
Grazing Intensity ◽  
Short Term ◽  
Good Correspondence ◽  
Acidic Lakes ◽  
P Limitation ◽  
Community Grazing ◽  
Enrichment Experiments

Short-term nutrient enrichment and zooplankton exclosure experiments were conducted at 14 lakes representing various stages of acidification (pH 4.6-6.8). We measured changes in chlorophyll as an indicator of the severity of nutrient limitation and grazing intensity and compared these with independent measures of P limitation (cell P quotas and phosphatase activity) and grazing (zooplankton densities and inferred community grazing rates). Results from nutrient enrichment experiments showed good correspondence to measured phosphatase activity but not cell P quotas. Phytoplankton in acidic lakes (pH < 5.0) responded more strongly to nutrient enrichment and exhibited fourfold higher biomass-specific phosphatase activity compared with nonacidic lakes. Phytoplankton responses to the removal of macrozooplankton did not exhibit any consistent pattern among lakes of varying acidity. Although the largest herbivores (Daphnia) were more abundant in nonacidic lakes, their absence in acidic lakes was compensated for by increased abundance of smaller species (principally Diaptomus minutus and Bosmina longirostris). The magnitude of the response to grazer removal was positively correlated with lake zooplankton densities at the time of the experiment, and the use of a nonlinear model enabled us to explain 84% of the variation in this response among the 14 sites.

Nutrient Enrichment Experiments in Tropical Great Lakes Malawi/Nyasa and Victoria

2003 ◽  
Vol 29 ◽  
pp. 89-106 ◽  
Author(s):  
Stephanie J. Guildford ◽  
Robert E. Hecky ◽  
William D. Taylor ◽  
Rose Mugidde ◽  
Harvey A. Bootsma
Keyword(s):  
Great Lakes ◽  
Nutrient Enrichment ◽  
Enrichment Experiments

scholarly journals NEECF: a project of nutrient enrichment experiments in China's forests

2013 ◽  
Vol 6 (5) ◽  
pp. 428-435 ◽  
Author(s):  
E. Du ◽  
Z. Zhou ◽  
P. Li ◽  
X. Hu ◽  
Y. Ma ◽  
...  
Keyword(s):  
Nutrient Enrichment ◽  
Enrichment Experiments

In situ nutrient enrichment experiments with periphyton in agricultural streams

Hydrobiologia ◽  
1989 ◽  
Vol 178 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Steven J. Bushong ◽  
Roger W. Bachmann
Keyword(s):  
Nutrient Enrichment ◽  
Agricultural Streams ◽  
Enrichment Experiments

Silicon Contamination in Diatom Nutrient Enrichment Experiments

1983 ◽  
Vol 40 (5) ◽  
pp. 657-664 ◽  
Author(s):  
Stephen J. Tarapchak ◽  
David R. Slavens ◽  
Michael A. Quigley ◽  
Judith S. Tarapchak
Keyword(s):  
Growth Rates ◽  
Nutrient Enrichment ◽  
Lake Michigan ◽  
Pyrex Glass ◽  
Short Term ◽  
Photosynthetic Rates ◽  
Nutrient Bioassay ◽  
Enrichment Experiments ◽  
Silicon Contamination

Large amounts of biologically available silicon (Si) were released into solution from the walls of Pyrex glass reagent bottles and Erlenmeyer flasks during nutrient bioassay experiments using Lake Michigan water. Photosynthetic rates in short-term (4–7 h) incubations and diatom growth rates and maximum yields in long-term incubations (~7 d) were affected by these extraneous Si supplies. The results of conventional nutrient enrichment bioassays performed in low-Si environments can be seriously biased unless Si contamination from glass incubation containers is avoided.

scholarly journals Nitrogen and phosphorus colimitation of phytoplankton in Lake Baikal: Insights from a spatial survey and nutrient enrichment experiments

2017 ◽  
Vol 62 (4) ◽  
pp. 1383-1392 ◽  
Author(s):  
Daniel R. O'Donnell ◽  
Paul Wilburn ◽  
Eugene A. Silow ◽  
Lev Y. Yampolsky ◽  
Elena Litchman
Keyword(s):  
Lake Baikal ◽  
Nutrient Enrichment ◽  
Nitrogen And Phosphorus ◽  
Enrichment Experiments

Ammonium and nitrate uptake lengths in a small forested stream determined by 15N tracer and short-term nutrient enrichment experiments

2000 ◽  
Vol 27 (3) ◽  
pp. 1320-1325
Author(s):  
Patrick J. Mulholland ◽  
Jennifer L. Tank ◽  
Diane M. Sanzone ◽  
Jackson R. Webster ◽  
Wilfred M. Wollheim ◽  
...  
Keyword(s):  
Nutrient Enrichment ◽  
Nitrate Uptake ◽  
15N Tracer ◽  
Short Term ◽  
Forested Stream ◽  
Enrichment Experiments
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