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

1998 ◽  
Author(s):  
P.J. Mulholland ◽  
J.L. Tank ◽  
D.M. Sanzone ◽  
J.R. Webster ◽  
W. Wollheim ◽  
...  
Keyword(s):  
Nutrient Enrichment ◽  
Nitrate Uptake ◽  
Short Term ◽  
Forested Stream ◽  
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

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.

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.

Responses of Ulva prolifera to short-term nutrient enrichment under light and dark conditions

2015 ◽  
Vol 163 ◽  
pp. 56-62 ◽  
Author(s):  
Kai-Ming Sun ◽  
Ruixiang Li ◽  
Yan Li ◽  
Ming Xin ◽  
Jie Xiao ◽  
...  
Keyword(s):  
Nutrient Enrichment ◽  
Ulva Prolifera ◽  
Short Term ◽  
Dark Conditions

scholarly journals Biochemical quality of basal resources in a forested stream: effects of nutrient enrichment

2016 ◽  
Vol 79 (1) ◽  
pp. 99-112 ◽  
Author(s):  
Isis Sanpera-Calbet ◽  
Irene Ylla ◽  
Anna M. Romaní ◽  
Sergi Sabater ◽  
Isabel Muñoz
Keyword(s):  
Nutrient Enrichment ◽  
Basal Resources ◽  
Biochemical Quality ◽  
Forested Stream
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