Nitrogen fixation by blue-green algal communities in the intertidal zone of the lagoon of Aldabra Atoll

Oecologia ◽  
1977 ◽  
Vol 27 (4) ◽  
pp. 275-283 ◽  
Author(s):  
M. Potts ◽  
B. A. Whitton
Keyword(s):  
Nitrogen Fixation ◽  
Intertidal Zone ◽  
Algal Communities ◽  
Green Algal

Ecology of deepwater rice-fields in Bangladesh 4. Nitrogen fixation by blue-green algal communities

Hydrobiologia ◽  
1988 ◽  
Vol 169 (1) ◽  
pp. 43-56 ◽  
Author(s):  
J. A. Rother ◽  
Abdul Aziz ◽  
N. Hye Karim ◽  
B. A. Whitton
Keyword(s):  
Nitrogen Fixation ◽  
Rice Fields ◽  
Deepwater Rice ◽  
Algal Communities ◽  
Green Algal

Differences Among Coccoid Green Algal Communities in Minnesota and North Dakota Lakes

2002 ◽  
Vol 38 (s1) ◽  
pp. 8-8
Author(s):  
P. K. Fawley ◽  
M. W. Fawley
Keyword(s):  
North Dakota ◽  
Algal Communities ◽  
Green Algal

Green algae in tundra soils affected by coal mine pollutions

Biologia ◽  
2008 ◽  
Vol 63 (6) ◽  
Author(s):  
Elena Patova ◽  
Marina Dorokhova
Keyword(s):  
Coal Mining ◽  
Green Algae ◽  
Coal Mine ◽  
Industrial Complex ◽  
Total Abundance ◽  
Tundra Soils ◽  
Algal Communities ◽  
Mining Impacts ◽  
Green Algal ◽  
Open Cast

AbstractGreen algal communities were investigated in clean and pollution-impacted tundra soils around the large coal mine industrial complex of Vorkuta in the E. European Russian tundra. Samples were collected in three zones of open-cast coal mining with different degrees of pollution-impacted soil transformation. A total of 42 species of algae were found in all zones. The species richness decreased from 27 species in undisturbed zones to 19 species in polluted zones. Under open-cast coal mining impacts the community structure simplified, and the dominant algae complexes changed. Algae that are typical for clean soils disappeared from the communities. The total abundance of green algae (counted together with Xanthophyta) ranged between 100–120 × 103 (cells/g dry soils) in undisturbed zones and 0.5–50 × 103 in polluted zones. Soil algae appear to be better indicators of coal mine technogenic pollution than flowering plants and mosses.

Comparison of the Nitrogen-15 Uptake and Acetylene Reduction Methods for Estimating the Rates of Nitrogen Fixation by Freshwater Blue-Green Algae

1980 ◽  
Vol 37 (3) ◽  
pp. 488-493 ◽  
Author(s):  
B. M. Graham ◽  
R. D. Hamilton ◽  
N. E. R. Campbell
Keyword(s):  
Nitrogen Fixation ◽  
Acetylene Reduction ◽  
Experimental Lakes Area ◽  
Method Of Calculation ◽  
Blue Green Algae ◽  
Northwestern Ontario ◽  
Green Algal ◽  
Reduction Methods ◽  
Ratio Determination ◽  
Relationship Of

The relationship of acetylene reduction to nitrogen-15 uptake was investigated using blue-green algal populations in three lakes in the Experimental Lakes Area, northwestern Ontario. Nitrogen fixation rates, as estimated with both techniques, were compared and acetylene to nitrogen ratios determined. Lake ratios ranged from 6.3 to 9.1 moles of acetylene reduced per mole of nitrogen fixed varying from sample to sample and also with the method of calculation. Explanations of the discrepancies between theoretical and empirical ratios are discussed; these include hypotheses of excretion of assimilated nitrogen-15 labeled material and interference from nitrogenase-mediated hydrogen production.Key words: acetylene reduction, nitrogen-15 uptake, nitrogen fixation, C2H2/N2 ratio determination

Green algae in spruce forests in the north-east of European Russia

Biologia ◽  
2008 ◽  
Vol 63 (6) ◽  
Author(s):  
Irina Novakovskaya ◽  
Elena Patova
Keyword(s):  
Boreal Forests ◽  
Algal Species ◽  
Coniferous Forest ◽  
European Russia ◽  
Technogenic Pollution ◽  
Algal Communities ◽  
Spruce Forests ◽  
North East ◽  
The North ◽  
Green Algal

AbstractThe green algal communities in podzolic soils under coniferous forest in N.E. European Russia were studied in areas that were subjected to different technogenic pollution intensities. Sixty-five green algal species belonging to 4 classes, 12 orders, 20 families and 27 genera were recorded. The algal communities in the investigated soils of the different type spruce phytocoenoses included from 15 to 38 taxa on one site. Indicator species were identified for background spruce forests (Chalmydomonas gelatinosa, Tetracystis aggregata, T. dissociata, Pseudopleurococcus botryoides, Myrmecia bisecta) and for aerotechnogenically polluted spruce forests (Actinochloris sphaerica). The results may be used for the monitoring of the ecological state of biota in soils under boreal forests of protected areas and spruce forests exposed to intense aerial technogenic pollution.

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