scholarly journals Ecology and Diversity of Diatoms in Kuttanadu Paddy Fields in Relation to Soil Regions, Seasons and Paddy-Growth-Stages

2016 ◽  
Vol 5 (2) ◽  
pp. 7 ◽  
Author(s):  
Dhanya Vijayan ◽  
Joseph George Ray
Keyword(s):  
Green Algae ◽  
Present Report ◽  
Soil Phosphorus ◽  
Green Revolution ◽  
Ecological Status ◽  
Soil Samples ◽  
Seedling Stage ◽  
Population Characteristics ◽  
Growth Stages ◽  
Blue Green Algae

This assessment of ecology and diversity of Diatoms in<em> Kuttanadu</em>, is continuation of the previous publications of Green-algae and Blue-green-algae of the same region; all the three investigations were carried out simultaneously. The unique <em>Kuttanadu </em>wetlands (90°17'N to 90°40'N; 760°19'E to 760°33'E), a well known ‘Rice bowl’ of Kerala, spread over 53,639 hectares, is located in Alapuzha District of Kerala, India. This wetland was once known for its high biodiversity, but currently severely affected by intensive green-revolution activities of past few decades. Main objective of the present report is to explain the diversity and ecological status of Diatoms in relation to the environment conditions currently existing in the region. Duration of the study was from December 2009 to October 2010. Soil samples of three different soil-types in two different crop-seasons, at two diverse crop-growth-stages are analyzed and compared. Altogether 120 composite soil samples randomly collected from the broad wetlands are analyzed. A rich community of Diatoms, of 40 species is found out. The order Naviculales is observed as the dominant Diatom (40%) in these paddy wetlands. Ecological parameters of Diatoms were found highest in the Lower<em> Kuttanadu</em> soil region, during <em>Virippu</em> season, at the seedling- stage of the crop, whereas the lowest value for most of the parameters were observed in <em>Kayal </em>soils during<em> Puncha</em> season at the seedling-stage. Apart from the specific soil factors influencing Diatom population characteristics in the region, crop seasons and soil phosphorus are found to have significant influence on Diatoms in this wetland paddy soils.

Blue-green algae in southern Australian rangeland soils.

1989 ◽  
Vol 11 (2) ◽  
pp. 67 ◽  
Author(s):  
RW Rogers
Keyword(s):  
Nitrogen Fixation ◽  
Climatic Change ◽  
Green Algae ◽  
Soil Conservation ◽  
Soil Surface ◽  
Soil Samples ◽  
Blue Green Algae ◽  
Range Condition ◽  
The Subject ◽  
Arid Rangelands

Blue-green algae (Cyanobacteria) are imponant to the ecology of arid rangelands as sources of nitrogen and as soil stabilizers, yet have been the subject of little comment or investigation in Australia. To provide information on their distribution soil samples were collected from 136 locations in rangeland areas of southem Australia and cultured to permit the identification of the blue-green algae present. Blue-green algae were found in 134 of the samples. The species represented include several apparently capable of nitrogen fixation, and all produce a gelatinous sheath which can bind soil panicles to produce soil-surface crusts. It is likely that lichens and blue-green algae are important for the ecology of arid rangelands now, and if climatic change destroys the lichens which are very heat sensitive when wet, blue- greens may become even more significant in soil conservation and the maintenance of pasture productivity. Both lichens and blue-green algae merit inclusion in assessments of range condition.

Blue-green algae of a developing salt marsh

1963 ◽  
Vol 43 (2) ◽  
pp. 309-317 ◽  
Author(s):  
W. D. P. Stewart ◽  
G. J. F. Pugh
Keyword(s):  
Salt Marsh ◽  
Green Algae ◽  
Salt Marshes ◽  
Personal Communication ◽  
Soil Samples ◽  
Algal Flora ◽  
Present Communication ◽  
Blue Green Algae ◽  
The Past ◽  
Green Algal

In the past few years considerable attention has been paid to the distribution of the microflora of the salt marshes at Gibraltar Point, Lincolnshire (National Grid reference TF 555576). During these studies it was observed (Turner, personal communication) that blue-green algae (Myxophyceae) were of frequent occurrence in soil samples from the region, but no analyses of the algal flora were carried out. It is well established, however, that blue-green algae are generally present in salt marsh regions (Chapman, 1960 a). Previous studies on the blue-green algae of British salt marshes are few, although detailed investigations have been carried out at Canvey and Ynyslas (Carter, 1932, 1933 a, b) and Scolt Head Island (Chapman, 1939). Some difficulty is experienced, however, in attempting to correlate these results with present day studies, mainly because of the widespread colonization of salt marsh regions within recent years by Spartina townsendii H. & J. Groves, and by the fact that few quantitative data are available. It is hoped that the present communication which is concerned with the blue-green algal flora of the New Marsh at Gibraltar Point, a region dominated by Spartina townsendii, will allow an assessment to be made of the flora prevailing in a developing salt marsh under present-day conditions.

Species Composition, Seasonal Dynamics and Distribution of Phytoplankton of the Zaporizke Reservoir

2017 ◽  
Vol 62 ◽  
pp. 1-10 ◽  
Author(s):  
Vladimir Yakovenko ◽  
Svetlana Melnik ◽  
Elena Fedonenko
Keyword(s):  
Surface Layer ◽  
Species Composition ◽  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Seasonal Dynamics ◽  
Temporal Dynamics ◽  
Ecological Status ◽  
Ecological State ◽  
Algae Biomass ◽  
Blue Green Algae

Species composition, seasonal dynamics and distribution of phytoplankton were researched to characterize temporal dynamics and horizontal distribution of phytoplankton and to indicate the ecological status of the sites in the Zaporizke reservoir. During 2015 - 2016 a seasonal dynamics of species composition and quantitative characteristics of phytoplankton have been studied near Monastyrsky island in upper part of the reservoir both in surface and bottom layers in conjunction with water temperature measurement. At early September 2016 phytoplankton sampling was performed at different sites of the Zaporizke reservoir including the sites undergone to sewage impact. During phytoplankton seasonal dynamics diatom bloom was reported in March and early April and algae biomass was higher in the bottom layer with a gradual decrease in the direction of the surface layer. From July to October the apparent dominance of blue-green algae took place with a clear concentration in the surface layer. Domination of the speciesMicrocystis aeruginosadetermined phytoplankton distribution along the reservoir at the beginning of September. Despite the high resistance to the effects of toxic substances the level ofMicrocystis aeruginosa (Kützing) Kützing 1846development decreased at the sites of direct sewage impact. At 100m below the sewages sites degree of phytoplankton development increased mainly due to increase of blue-green algae abundance. Indexes of phytoplankton showed the best ecological state at the site «near Kodaki water draw-off» and the worst ecological state at the sites of direct sewage impact. The results obtained are important to indicate ecological state of the sites in the Zaporizke reservoir.

scholarly journals The distribution of blue-green algae (Cyanobacteria) from the paddy fields of Patan and Karad tehsils of Satara District, Maharashtra, India

2019 ◽  
Vol 11 (14) ◽  
pp. 14862-14869 ◽  
Author(s):  
Sharada Jagannath Ghadage ◽  
Vaneeta Chandrashekhar Karande
Keyword(s):  
Distribution Pattern ◽  
Green Algae ◽  
Paddy Field ◽  
Chemical Properties ◽  
Soil Samples ◽  
Paddy Fields ◽  
Available N ◽  
Blue Green Algae ◽  
Green Algal ◽  
Physico Chemical

The distribution pattern of blue-green algae was studied from paddy fields of Patan and Karad tehsils in relation to physico-chemical properties of soil, viz., pH, electrical conductivity, organic carbon %, available N, P, and K.  Paddy field soil samples of 38 localities from Patan and 28 localities from Karad were analysed.  One-hundred-and-thirty-seven species belonging to 35 genera of 10 families from three orders were encountered from paddy field soils of both the tehsils.  Out of 66 soil samples 93.65% samples showed occurrence of unicellular, heterocystous and non heterocystous forms while 6.34% soil samples showed only non heterocystous forms.  Anabaena and Oscillatoria were found to be of common occurrence.  Significant variation was not observed in distribution pattern of blue-green algal forms in relation to physico-chemical properties during successive surveys.

Freeze-Fracture Replication in the Ultrastructure of Blue-Green Algae

1967 ◽  
Vol 25 ◽  
pp. 74-75
Author(s):  
L. V. Leak
Keyword(s):  
Cell Wall ◽  
Electron Microscope ◽  
Green Algae ◽  
Three Dimensional ◽  
Freeze Fracture ◽  
Electron Microscopic ◽  
Photosynthetic Membranes ◽  
Blue Green Algae ◽  
Cell Biol ◽  
Cellular Components

Electron microscopic observations of freeze-fracture replicas of Anabaena cells obtained by the procedures described by Bullivant and Ames (J. Cell Biol., 1966) indicate that the frozen cells are fractured in many different planes. This fracturing or cleaving along various planes allows one to gain a three dimensional relation of the cellular components as a result of such a manipulation. When replicas that are obtained by the freeze-fracture method are observed in the electron microscope, cross fractures of the cell wall and membranes that comprise the photosynthetic lamellae are apparent as demonstrated in Figures 1 & 2.A large portion of the Anabaena cell is composed of undulating layers of cytoplasm that are bounded by unit membranes that comprise the photosynthetic membranes. The adjoining layers of cytoplasm are closely apposed to each other to form the photosynthetic lamellae. Occassionally the adjacent layers of cytoplasm are separated by an interspace that may vary in widths of up to several 100 mu to form intralamellar vesicles.

New constituents from Oryza sativa L. straw and their algicidal activities against blue-green algae

2017 ◽  
Vol 40 (1) ◽  
pp. 47-62 ◽  
Author(s):  
I. M. Chung ◽  
S. H. Kim ◽  
Y.T. Oh ◽  
M. Ali ◽  
A. Ahmad
Keyword(s):  
Oryza Sativa ◽  
Green Algae ◽  
Oryza Sativa L ◽  
Blue Green Algae
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