scholarly journals Light Penetration into Fresh Water

1934 ◽  
Vol 11 (1) ◽  
pp. 89-93
Author(s):  
W. H. PEARSALL ◽  
PHILIP ULLYOTT
Keyword(s):  
Light Intensity ◽  
Fresh Water ◽  
Green Algae ◽  
Aquatic Plants ◽  
Submerged Vegetation ◽  
Light Penetration ◽  
Blue Green Algae

1. The penetration of light into Windermere is dependent chiefly on the numbers of phytoplankton organisms in the epilimnion. 2. It appears that the greatest depth at which rooted aquatic plants can grow must therefore be affected by the abundance of phytoplankton. The rooted plants are most active during July and August. Observations show that at this time the presence of blue-green algae reduces the light intensity at the limit of submerged vegetation (4·3 metres) by more than 50 per cent.

Studies on the Fresh Water Poisonous Planktonic Cyanobacteria (Blue Green Algae) of Manchar Lake Dadu, Sindh, Pakistan

2000 ◽  
Vol 3 (11) ◽  
pp. 1973-1975 ◽  
Author(s):  
Mahar M.A. . ◽  
S.I.H. Jafri . ◽  
S.M. Leghari . ◽  
M.Y. Khuhawar . ◽  
A.A. Noor .
Keyword(s):  
Fresh Water ◽  
Green Algae ◽  
Blue Green Algae ◽  
Manchar Lake

Antimutagenic properties of fresh-water blue-green algae

1994 ◽  
Vol 39 (4) ◽  
pp. 301-303 ◽  
Author(s):  
N. Lahitová ◽  
M. Doupovcová ◽  
J. Zvonár ◽  
J. Chandoga ◽  
G. Hocman
Keyword(s):  
Fresh Water ◽  
Green Algae ◽  
Blue Green Algae

Special aspects of nitrogen fixation by blue-green algae

1969 ◽  
Vol 172 (1029) ◽  
pp. 357-366 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Nitrogen Fixation ◽  
Light Intensity ◽  
Green Algae ◽  
Limited Extent ◽  
Anabaena Cylindrica ◽  
Fixed Nitrogen ◽  
Normal Cells ◽  
Blue Green Algae ◽  
Reducing Potential

When carbon dioxide fixation was over 90 % inhibited by CMU , nitrogen fixation remained unaffected in nitrogen-starved cells of Anabaena cylindrica . In normal cells under the same conditions nitrogen fixation was about 50 % inhibited by CMU . These data suggest, first, that nitrogen fixation in this organism is independent of reducing potential generated by non-cyclic photo-electron transport and, secondly, that nitrogen fixation is stimulated by photosynthetically produced carbon skeletons to assimilate the fixed nitrogen. Although nitrogen fixation occurred to a limited extent in the dark, increasing light intensity stimulated nitrogen fixation both in the presence and absence of CMU . This suggests that light-generated ATP is required for nitrogen fixation in this alga. A ratio of pyruvate decarboxylation to nitrogen fixation of 3:1 has been established for A. cylindrica . This accords with the hypothesis that pyruvate acts as a hydrogen donor for nitrogen reduction and that provision of the required reductant is independent of photosynthesis in blue-green algae.

scholarly journals Cyanophycean Flora 0f Southern Himanchal Pradesh, India

2009 ◽  
Vol 15 ◽  
pp. 29-36
Author(s):  
R. K. Dwivedi ◽  
S. K. Shukla ◽  
C. P. Shukla ◽  
P. K. Misra ◽  
M. K. Seth
Keyword(s):  
Key Words ◽  
Fresh Water ◽  
Green Algae ◽  
First Report ◽  
Blue Green Algae

The present paper deals with 37 taxa, 18 genera, 32 species, 4 varieties and 1 forma explored from southern Himanchal Pradesh of India. These taxa are represented by Microcystis, Chroococcus, Aphanocapsa, Aphanothece, Merismopedia, Coelosphaerium, Gomphosphaeria, Stichosiphon, Oscillatoria, Lyngbya, Pseudanabaena, Cylindrospermum, Anabaena, Nostoc, Nodularia, Fortiea, Calothrix, Anabaenopsis. Out of 37 taxa, 27 are first report from the study area. Key words: Fresh-water, blue-green algae, systematics, southern Himanchal Pradesh, India.   doi: 10.3126/eco.v15i0.1939   ECOPRINT 15: 29-36, 2008

Sign in / Sign up

Export Citation Format

Share Document