Production of labile and refractory dissolved organic carbon by zooplankton excretion: an experimental study using large outdoor continuous flow-through ponds

1997 ◽  
Vol 54 (2) ◽  
pp. 434-443 ◽  
Author(s):  
J C Park ◽  
M Aizaki ◽  
T Fukushima ◽  
A Otsuki
Keyword(s):  
Experimental Study ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Continuous Flow ◽  
Flow Through ◽  
Zooplankton Excretion

scholarly journals Influence of Fish on Dominance of Blue-green Algae: an Experimental Study Using Large Outdoor Continuous Flow-through Ponds.

1998 ◽  
Vol 21 (8) ◽  
pp. 520-529
Author(s):  
Takehiko FUKUSHIMA ◽  
Morihiro AIZAKI ◽  
Kazuo MATSUSHIGE ◽  
Chie MATSUNAGA ◽  
Masaaki HOSOMI ◽  
...  
Keyword(s):  
Experimental Study ◽  
Green Algae ◽  
Continuous Flow ◽  
Blue Green Algae ◽  
Flow Through

scholarly journals Available Dissolved Organic Carbon Alters Uptake and Recycling of Phosphorus and Nitrogen from River Sediments

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3321
Author(s):  
Marc Stutter ◽  
Daniel Graeber ◽  
Gabriele Weigelhofer
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Nutrient Uptake ◽  
Inorganic Nitrogen ◽  
River Sediments ◽  
Carbon Sources ◽  
P Uptake ◽  
Stream Sediments ◽  
Organic C ◽  
Flow Through

Concurrent with nutrient pollution, agriculture has significantly impacted the quantity, composition, and bioavailability of catchment-derived dissolved organic carbon (DOC) in stream ecosystems. Based on the stoichiometric theory, we tested the hypothesis that bioavailable DOC will stimulate the heterotrophic uptake of soluble reactive P (SRP) and inorganic nitrogen in stream sediments. In a simplified laboratory column flow-through study, we exposed stream sediments to additions of glucose, nitrate, and phosphate alone and in combination (+C, +NP, +CNP), and calculated gross and net changes in DOC and nutrients via a mass balance approach. Our results show that glucose-C increased nutrient uptake, but also that NP additions resulted in the enhanced consumption of both native and added organic C. The effects of C addition were stronger on N than P uptake, presumably because labile C stimulated both assimilation and denitrification, while part of the P uptake was due to adsorption. Internal cycling affected net nutrient uptake due to losses of dissolved organically-complexed P and N (DOP and DON). Overall, our study shows that increases in the stoichiometric availability of organic carbon can stimulate N and P sequestration in nutrient-polluted stream sediments. Future studies are required to assess the effects of complex organic carbon sources on nutrient uptake in stream sediments under different environmental conditions, and whether these stoichiometric relations are relevant for ecosystem management.

Effect of omnivorous fish on the production of labile and refractory dissolved organic carbon by zooplankton excretion in a simulated eutrophic lake

2000 ◽  
Vol 34 (1) ◽  
pp. 230-238 ◽  
Author(s):  
Akira Otsuki ◽  
Je-Chul Park ◽  
Takehiko Fukushima ◽  
Morihiro Aizaki ◽  
Dog-Soo Kong
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Eutrophic Lake ◽  
Omnivorous Fish ◽  
Zooplankton Excretion
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