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S. Rajashekara
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Department of Studies in Zoology, Bangalore
University, Jnana Bharathi Campus, Bangalore - 560 056, India
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M.G. Venkatesha
(Corresponding author)
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Department of Studies in Zoology, Bangalore
University, Jnana Bharathi Campus, Bangalore - 560 056, India
e-mail: venkatmelally@gmail.com
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Publication Data
Paper received:
01 February 2009
Revised
received:
03 June 2010
Accepted:
15 July 2010
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Abstract
Observations were made on
the occurrence, abundance, richness, and diversity of waterbirds in 15 major
lakes in Bangalore
city during 2008 - 2009. During the study period 35 species of aquatic birds
were recorded. The number of aquatic bird species recorded at various lakes
ranged from 23 to 35. The percent abundance of waterbirds recorded in the
study lakes ranged from 2.46 to 21.49 and it was significantly different
(p<0.05). The diversity and species evenness of waterbirds in the lakes
ranged from 2.07 to 3.16 and 0.32 to 0.76, respectively. There was a
significant difference (p<0.05) in the diversity and species evenness of
waterbirds among different lakes.?
Species richness of the bird population ranged from 2.89 to 4.01 in
the different study lakes and it was not significantly different (p>0.05).
There was a variation in number of waterbird species recorded during summer,
monsoon and winter seasons. Of the 35 waterbird species, Bubulcus ibis
showed cent percent frequency, whereas less frequently (4.44%) observed
species was Anas platyrhynchos. Among various waterbird species, Bubulcus
ibis, Fulica atra, Tringa hypoleucos, Motacilla maderaspatensis,
Phalacrocorax niger,
Egretta garzetta, Charadrius dubius, Ardeola grayji, Halcyon smyrnensis and
Motacilla
alba were frequently
encountered in most of the study lakes.
Key
words
Abundance, Diversity,
Evenness, Seasonal occurrence, Waterbirds
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