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International Journal of Recent Trends in Science and Technology, ISSN 2277-2812 E-ISSN: 2249-8109
Volume 11, Issue 3, July 2014 pp 325-330
Seasonal variation in the population of Cattle Egrets (Bubulcus ibis), Inhabiting the Arid Zone of Rajasthan
Madhu Sharma1, K. C. Soni2
1 Research Scholar Maharaja, Ganga Singh University, Bikaner, Rajasthan, INDIA.
2Lecturer in Zoology, Government College, Taranagar, Churu, Rajasthan, INDIA.
It is important to know the population size of a species for ecological studies. Counts of birds are used for many purposes in a variety of field studies. Simple presence or absence information suffices to study avian biogeography, but indices of abundance are needed to track the changing mix of species population associated with plant succession. Still other studies as of trophic dynamic require knowledge of population densities. Based on a pilot study of consecutive 5 days counts of the Egrets at the roosts sites selected it was henceforth assumed that the average number of Egrets at any one roosts remains more or less constant for a period of at least three week. Each census was carried out during first two weeks of the month. It was assumed no radical overlap of individuals among the different roosts in the study area. The flock size of the Cattle Egret varies significantly with seasons. Thus conclusion can be drawn that the dispersal of the egrets depends upon climatic conditions affecting food availability.