Location: Shimoga district,Kamataka
Area: 73.68 ha
Altitude: c.400 m
Description of site: Gudavi, a traditional nesting
habitat for a number of colonial waterbirds, appears to have been in existence
for well over a century. The sanctuary is a medium-sized tank with a raised
bond, bordered on its eastern and Southwestern sides by open, moist, deciduous
forest. The waterspread area itself has been demarcated into a smaller southern,
and a much larger northern, sector by raised bunds. The smaller sector comprises
heronries where 12 species of waterbird breed from July to November.
The northern sector is used by a variety of resident and migratory waterbirds.
On its northern side, the sanctuary has agricultural fields. The water from
the tank is used for irrigating rice-fields on the eastern side of the Varada
river which flows 0.5 km from the sanctuary. The tank gets impounded during
the monsoon, and becomes shallow and dry during summer. The average depth
of water in the heronry is 1.5 m, and the maximum depth is about 2 m. The
soil in the sanctuary area is mainly lateritic
Climatic conditions: Tropical monsoon climate with
an average rainfall of 1877 mm. The area is influenced by the northwest monsoon
from June to September. April is the hottest month, with the daily mean temperature
varying from 22° C to 32° C. In December, the maximum temperature is 23°C
and the minimum 15°C. The relative humidity throughout the year generally
exceeds 75 %. During the monsoon, the relative humidity is over 80 %. The
driest part of the year is January to March when the relative humidity in
the afternoon is less than 40 % Principal vegetation: Moist, evergreen deciduous
forest around the tank. The tank itself has floating lillies and azolla among
other water plants; and tree species on the periphery are dominated by Terminalia
tomentosa, Terminalia arjuna, Syzygium operculata, bamboo, acacia, Casuarina,
etc
Fauna: A very important area for both resident and
migratory waterfowl. The 1991 and 1992 waterfowl censuses recorded the following
species: Tachybaptus ruficollis (22), Anhinga melanogaster (5), Ardeola grayii
(12), Bubulcus ibis (18), Egretta garzetta (8), E.intermedia (4), Ardeola
purpurea (2), Sarkidiornis melanotos (8), Nettapus coromandelianus (35), Anas
strepera (6), A.crecca (28), A.poecilorhyncha (115), A.acuta (109), Amaurornis
phoenicurus (8), Gallicrex cinerea (6),Gallinula chloropus (16), Fulica atra
(321), Hydrophasianus chirurgis (35), Metopidius indicus (25), Himantopus
himantopus (4),Vanellus indicus (6),Totanus glareola (6), Actitis hypoleucos
(8), Gallinago gallinago (8), Calidris minuta (6), Alauda gulgula (25), and
Merops orientalis (10)
Special floral values: Trees in the area serve as good nesting
sites for waterfowl. Floating plants and weeds are also used for nesting.
The species Terminalia arjuna is becoming scarce in the Western Ghats. Azolla
and other floating species of the tank are ideal biomass for the production
of biogas and compost
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