Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

2021 ◽  
Vol 26 (4) ◽  
Author(s):  
Pâmela R. Gayer ◽  
Pablo S. Guimarães ◽  
Edélti F. Albertoni ◽  
Luiz U. Hepp
Keyword(s):  
Organic Matter ◽  
Allochthonous Organic Matter ◽  
Subtropical Lakes ◽  
Bacterial Decomposition

Sources and distribution of allochthonous organic matter in surface sediment from the Seomjin River to the southern inner shelf of Korea

2017 ◽  
Vol 52 (4) ◽  
pp. 489-499
Author(s):  
Adegoke Olugboyega Badejo ◽  
Sangmin Hyun ◽  
Wonnyon Kim ◽  
Se-Jong Ju ◽  
Bareum Song
Keyword(s):  
Organic Matter ◽  
Surface Sediment ◽  
Allochthonous Organic Matter ◽  
Inner Shelf ◽  
Seomjin River

scholarly journals Optically determined sources of allochthonous organic matter and metabolic characterizations in a tropical oligotrophic river and associated lagoon

2006 ◽  
Vol 25 (1) ◽  
pp. 185-197 ◽  
Author(s):  
Daniel L. Roelke ◽  
James B. Cotner ◽  
José V. Montoya ◽  
Carlos E. Del Castillo ◽  
Stephen E. Davis ◽  
...  
Keyword(s):  
Organic Matter ◽  
Allochthonous Organic Matter

scholarly journals Changes in the hydrochemical regime of Onegо Lake since the early 1990s

2019 ◽  
pp. 62-72 ◽  
Author(s):  
N. M. Kalinkina ◽  
E. V. Tekanova ◽  
A. V. Sabylina ◽  
A. V. Ryzhakov
Keyword(s):  
Organic Matter ◽  
River Water ◽  
Ph Value ◽  
Correlation Coefficients ◽  
Climatic Conditions ◽  
Allochthonous Organic Matter ◽  
Hydrochemical Regime ◽  
First Time ◽  
Liquid Precipitation

The supply of allochthonous organic matter with river water to the lakes rises in the new climatic conditions of Karelia (mild winters, an increase in the amount of liquid precipitation, less freezing of the soil). In connection with the geochemical peculiarities of Fennoscandia, more quantity of humic substances in a complex with iron and phosphorus enter the water bodies. These processes can lead to a change in the hydrochemical regime, water quality and habitat of the biota. For the first time for lakes of Karelia, long-term changes (1963–2017) of parameters, which are markers of allochthonous organic matter, were estimated on the example of Petrozavodsk Bay of Onego Lake. It was found that since the 1990s, the following characteristics significantly increase in Petrozavodsk Bay water: the color of water (from 56 to 73 degrees), the content of suspended matter (from 1.6 to 3 mg/l), iron (from 0.12 to 0.42 mg/l), phosphorus (from 12 to 22 μg/l). This leads to changes in the carbonate system of the bay water. The concentration of carbon dioxide increases significantly (from 1.2 to 3.0 mg/l), the pH value drops (from 7.22 to 7.12) and the oxygen content diminishes (from 101 to 92% of saturation). The Spearman correlation coefficients between the chemical characteristics and the year of study were the highest for the spring period, when the bay is separated from the open part of the lake by thermal bar and is strongly influenced by river water. Simultaneously with the change in the hydrochemical regime, there is an increase in the amount of iron in the upper layer of silts (from 0.65 to 4.8% of the air-dry sample). This led to a decrease in the number of macrozoobenthos 6–7 times.

IRON METABOLISM IN TWO BASINS OF A LAKE NEAR OSLO, NORWAY

1970 ◽  
Vol 1 (3) ◽  
pp. 158-180 ◽  
Author(s):  
ANDERS BØYUM
Keyword(s):  
Organic Matter ◽  
Iron Metabolism ◽  
Deep Water ◽  
Lake Water ◽  
Critical Concentration ◽  
Coniferous Forest ◽  
Eutrophic Lake ◽  
Allochthonous Organic Matter ◽  
Dystrophic Lake ◽  
Eutrophic Lake Water

Langlivann and Himtjern are two basins in a lake situated on rocks poor in lime and with coniferous forest and bogs in the surroundings. The lake is fundamentally oligotrophic. The influence of allochthonous organic matter is shown by lake colours which are different shades of brown, and by water colours which at the surface are from 15 to 25 on the mg Pt/1 scale. Some differences in hydrology and morphology make the thermal and oxygen stratifications different in the two basins. At certain periods iron is accumulated in great quantities in the deep water. The differences, both in time and depth, in oxygen concentration make it possible to study the influence of this element on the reduction/oxidation of iron. An attempt has been made to find the critical concentration of oxygen. The value found by Einsele (1940) in eutrophic lake water seems also to be valid in this dystrophic lake. The development of dichotomous pH stratifications is shown. They seem to confirm the above statement.

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