Nitrogen isotopic fractionation of particulate organic matter production and remineralization in the Prydz Bay and its adjacent areas

2020 ◽  
Vol 39 (12) ◽  
pp. 42-53
Author(s):  
Chunyan Ren ◽  
Min Chen ◽  
Laodong Guo ◽  
Jian Zeng ◽  
Renming Jia ◽  
...  
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Isotopic Fractionation ◽  
Prydz Bay ◽  
Organic Matter Production ◽  
Matter Production

Indirect Effects of Detritus Manipulations in a Montane Stream

1991 ◽  
Vol 48 (5) ◽  
pp. 776-783 ◽  
Author(s):  
John S. Richardson ◽  
William E. Neill
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Trophic Group ◽  
Stream Channels ◽  
Organic Matter Production ◽  
Common Assumption ◽  
Matter Production ◽  
High Loading Rate ◽  
Ecosystem Theory ◽  
Larvae Density

To evaluate the common assumption in stream ecosystem theory that fine-particle feeders can indirectly benefit from coarse-particle detritus consumed by detritivores, we manipulated whole-leaf detritus in replicated experimental stream channels. Elevated input rates of detritus resulted in significantly higher densities of collectors and moderate but nonsignificantly higher densities of predators. When collectors were analyzed as filterers and gatherers separately, there were significantly higher densities of both groups at a high loading rate of leaves. The net rates of colonization for each trophic group did not differ significantly with respect to treatment, which suggests that the increased densities of collectors observed under high leaf input rates were due to increased survival of larvae. Density of no single taxon increased significantly in response to coarse particulate organic matter inputs; rather, most species showed moderate increases. Species richness showed no treatment effect. Increases in collector density may result indirectly from increased fine particulate organic matter production due to feeding by shredders. Predaceous species which responded were small taxa and were probably predators on collectors. These effects were observed over a period of less than 5 mo and demonstrate the potential strength of the interactions.

scholarly journals Dark Fixation of CO2 in the Lake with Special Reference to Organic Matter Production

1970 ◽  
Vol 83 (990) ◽  
pp. 397-410 ◽  
Author(s):  
Masayuki TAKAHASHI ◽  
Yukuya YAMAGUCHI ◽  
Shun-ei ICHIMURA
Keyword(s):  
Organic Matter ◽  
Special Reference ◽  
Organic Matter Production ◽  
Matter Production ◽  
Dark Fixation

Effect of light on particulate and dissolved organic matter production of native and exotic macrophyte species in Patagonia

Hydrobiologia ◽  
2015 ◽  
Vol 766 (1) ◽  
pp. 29-42 ◽  
Author(s):  
Florencia Cuassolo ◽  
Marcela Bastidas Navarro ◽  
Esteban Balseiro ◽  
Beatriz Modenutti
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Organic Matter Production ◽  
Matter Production ◽  
Macrophyte Species ◽  
Effect Of Light

scholarly journals Nonsinking Organic Matter Production in the California Current

2018 ◽  
Vol 32 (9) ◽  
pp. 1386-1405 ◽  
Author(s):  
B. M. Stephens ◽  
M. Porrachia ◽  
S. Dovel ◽  
M. Roadman ◽  
R. Goericke ◽  
...  
Keyword(s):  
Organic Matter ◽  
California Current ◽  
Organic Matter Production ◽  
Matter Production

scholarly journals Form III RubisCO-mediated transaldolase variant of the Calvin cycle in a chemolithoautotrophic bacterium

2019 ◽  
Vol 116 (37) ◽  
pp. 18638-18646 ◽  
Author(s):  
Evgenii N. Frolov ◽  
Ilya V. Kublanov ◽  
Stepan V. Toshchakov ◽  
Evgenii A. Lunev ◽  
Nikolay V. Pimenov ◽  
...  
Keyword(s):  
Organic Matter ◽  
De Novo ◽  
Calvin Cycle ◽  
Ribulose Bisphosphate Carboxylase ◽  
Bisphosphate Carboxylase ◽  
Organic Matter Production ◽  
Matter Production ◽  
Ribulose Bisphosphate Carboxylase Oxygenase ◽  
Key Enzyme ◽  
Nucleoside Metabolism

The Calvin–Benson–Bassham (CBB) cycle assimilates CO2for the primary production of organic matter in all plants and algae, as well as in some autotrophic bacteria. The key enzyme of the CBB cycle, ribulose-bisphosphate carboxylase/oxygenase (RubisCO), is a main determinant of de novo organic matter production on Earth. Of the three carboxylating forms of RubisCO, forms I and II participate in autotrophy, and form III so far has been associated only with nucleotide and nucleoside metabolism. Here, we report that form III RubisCO functions in the CBB cycle in the thermophilic chemolithoautotrophic bacteriumThermodesulfobium acidiphilum,a phylum-level lineage representative. We further show that autotrophic CO2fixation inT. acidiphilumis accomplished via the transaldolase variant of the CBB cycle, which has not been previously demonstrated experimentally and has been considered unlikely to occur. Thus, this work reveals a distinct form of the key pathway of CO2fixation.

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