scholarly journals Localization of the organic matter production and degradation in two different estuaries

2021 ◽  
Vol 244 ◽  
pp. 01010
Author(s):  
Anna Vazhova ◽  
Yury Zuenko
Keyword(s):  
Organic Matter ◽  
River Water ◽  
Inorganic Phosphorus ◽  
Phosphorus Concentration ◽  
Potential Productivity ◽  
Organic Matter Production ◽  
Internal Part ◽  
Matter Production ◽  
Physical And Chemical ◽  
Water Dilution

Physical and chemical processes related to primary production of the estuaries of two rivers with different water regime are considered with special attention to their spatial and seasonal variability. Both production and degradation of the organic matter are quantitatively evaluated on the data of non-conservative variation of dissolved inorganic phosphorus concentration in the process of the river water dilution. Contribution of recycling to the phosphorus balance and the estuarine waters productivity is estimated. The organic matter degradation prevailed in the internal part of both estuaries, but its production dominated in their external parts, with a tendency of production lowering and degradation strengthening from spring to autumn. Utilization of the re-mineralized phosphorus in the external estuaries increased their potential productivity by 20-50%, provided by the terrigenous flux with the river water.

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.

Ecological role of grapsid crabs in mangrove ecosystems: a review

1998 ◽  
Vol 49 (4) ◽  
pp. 335 ◽  
Author(s):  
S. Y. Lee
Keyword(s):  
Organic Matter ◽  
Structure And Function ◽  
Mangrove Species ◽  
Organic Matter Production ◽  
Mangrove Ecosystems ◽  
Matter Production ◽  
Feeding Activities ◽  
And Function ◽  
Growth And Reproduction

Recent research on Indo–Pacific mangroves has confirmed the significant role played by grapsid crabs in the structure and function of these ecosystems. Through the feeding activities of the crabs, large proportions of organic matter production, i.e. mangrove leaves, are recycled within the forest. This initial retention of production in the forest refines earlier estimates of tidal export from the mangroves. Crab-processed organic matter could also form the basis of a coprophagous food chain involving small invertebrates, or be re-exported as micro-particulates. Differential consumption by crabs of mangrove propagules also affects mangrove community structure by diminishing the relative abundance of species whose propagules are preferred foods. Bioturbation by the crabs also results in changes in surface topography, particle size distribution and degree of aeration and, thus, the concentration of phytotoxins in the substratum. Such changes could affect growth and production of the mangroves. Growth and reproduction of the crabs may in turn be influenced by the associated mangrove species, mainly through the provision of food. The semi-terrestrial and air-breathing habit of the grapsid crabs probably makes them tolerant of deoxygenation caused by organic enrichment, but development of the landward mangroves will strongly affect survival of the crabs.

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