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

scholarly journals Response of Growth and Grazing Rate of Nanoflagellates on Synechococcus spp. to Experimental Nutrient Enrichment

Water ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 2686
Author(s):  
An-Yi Tsai ◽  
Vladimir Mukhanov
Keyword(s):  
Nutrient Enrichment ◽  
Grazing Rate ◽  
Grazing Impact ◽  
Nutrient Additions ◽  
Planktonic Food ◽  
Incubation Experiments ◽  
In Situ Conditions ◽  
Marked Decline ◽  
Enrichment Experiments

As important bacterivores in planktonic food webs, mixotrophic nanoflagellates cancause mortality in marine Synechococcus spp. Our previous study found that the pigmented nanoflagellate (PNF) has a significant grazing impact on Synechococcus spp. In the current study, we applied the dilution approach to test the growth and grazing rates of nanoflagellates on Synechococcus spp. We then compared the differences between experimental nutrient additions and in situ conditions in the coastal waters of the East China Sea during the summer season from July to September. The growth rates of Synechococcus spp. in the ambient environment were between 0.54 and 0.62 day−1, which were slightly higher than the 0.56 and 0.66 day−1 with nutrient enrichment in summer. In contrast, our nutrient enrichment experiments produced a marked decline approximately from 21% to 58%in the nanoflagellate grazing rate on Synechococcus spp. The reason was that the mixotrophic PNFs directly used the added nutrients and reduced their supply of nutrients from prey during the incubation experiments.

Nutrient enrichment and in-situ waste removal through electrical means for hybridoma cultures

1995 ◽  
Vol 47 (3) ◽  
pp. 319-326 ◽  
Author(s):  
Yu-Hsiang David Chang ◽  
Alan J. Grodzinsky ◽  
Daniel I. C. Wang
Keyword(s):  
Nutrient Enrichment ◽  
Waste Removal

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.

scholarly journals In situ soft sediment nutrient enrichment: A unified approach to eutrophication field experiments

2016 ◽  
Vol 111 (1-2) ◽  
pp. 287-294 ◽  
Author(s):  
Emily J. Douglas ◽  
Conrad A. Pilditch ◽  
Laura V. Hines ◽  
Casper Kraan ◽  
Simon F. Thrush
Keyword(s):  
Nutrient Enrichment ◽  
Field Experiments ◽  
Soft Sediment ◽  
Unified Approach

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
Sign in / Sign up

Export Citation Format

Share Document