Studies on ecological non-heterocrystous nitrogen fixing filamentous Cyanoprocaryota of specific Gangetic zone in West Bengal

Nikhil Chandra Halder

Nikhil Chandra Halder Department of Botany, Uluberia College (University of Calcutta), Uluberia, Howrah-711315, West Bengal, India

Keywords: Cyanoprocaryorota, ecology, filamentous, non-heterocystous

Abstract

In the present communication, the studies on ecological diversity of non heterocystous nitrogen fixing filamentous Cyanoprocaryorota (BGA) in different rice growing and other fields of specific Gangetic zone in West Bengal has been under taken. Several perennial lentic and lotic water bodies are found in relation to seasonal variation in the area however, the algal species occurring there has not yet been surveyed in this manner. A total of 226 algal taxa belonging to Cyanoprocaryorota under the order Nostocales, in which 69 species and 33 variety and forma are in rice fields areas and out of 124 taxa in which 90 species and 34 variety and forma are in all habitats. The increasing range of soil pH was the important factor for the development of BGA more up to certain limits. Comparatively very common and maximum number of non heterocystous nitrogen fixing filamentous genera is Oscillatoria Vaucher, Phormidium Kuetzing, Lyngbya Agardh, Arthospira Stizenberger and minimum forms are Schizothrix Kuetzing and Spirulina Turpin em. Gardner developed in August to September in different rice growing areas and September to October in all habitats. When water level was minimum and normal i.e. 9 cm or more, starting the crop season the rice growing fields developed mainly filamentous forms and colonial forms developed after 10 to 15 days.

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