has a pride of place in Odisha's literature and culture, and has
influenced the poets and philosophers. It has held great significance
for planners, scientists, international organizations like 'The
Wetlands International' and 'Asian Wetland Bureau'. Chilika lagoon
has been designated as a Ramsar site (Wetland of International importance)
from the 1st October, l981.
The water spread of the lagoon
varies between 1165 Sq.km in monsoon to 906 Sq.km during summer,
and extends over Puri, Khurda and Ganjam districts. The lagoon itself
can be broadly divided in to four natural sectors based on salinity
and depth: the southern zone, central zone, northern zone,
and the outer channel.
Numerous islands are present in the lagoon, prominent among which
are Kalijai, Honeymoon, Barakuda, Breakfast, Birds Island, etc.
One of the submerged (potential)
islands covering, an area of 15.53 Sq.km has been notified as Chilika
(Nalaban) Wildlife Sanctuary on 17th December l987. The whole area
of the Chilika Lake, excluding the area notified as Sanctuary has
been declared as a 'Closed Area' for a period of five years with
effect from 16th December 2002.
ecosystem features of Chilika comprising of tidal ingress from the
sea, which mixes with the fresh water brought by rivers like Daya,
Bhargabi, Luna, and large number of rivulets.
Several islands are
situated in this lagoon, inhabited by large human population (1.3
lakh approx.) variously dependent on this wetland for sustenance.
A number of villages and towns around the lagoon are closely associated
with the wetland, in one way or the other for economic activities.
About 70% of this population depends on fishing as the means of
The Chilika Lagoon is hot spot of rich Biodiversity.
There are 546 species of angiospermic plants belonging to 379 genera
and 107 families, above 100 phytoplankton genera, 20 species of
weed and 7 pteridophytic species documented so far in the Lagoon
and the islands.
Chilika is very rich in both invertebrate and vertebrate fauna. This
Ramsar site is the habitat for the largest congregation of waterfowls
Over a million birds
congregate in this water body for feeding and roosting. Migration
commences in late September and the birds remain up to April, but
the peak congregation period is mid-December to middle of January.
Birds belonging to over 230 species including 14 birds of prey (32%
aquatic, 22%waders, and 46% terrestrial birds) are seen in this
lake, of which 95 species are intercontinental and local migrants.
Flocks of migratory waterfowl arrive from as far as the Caspian
Sea, Lake Baikal, remote parts of Russia, central and south East
Asia, Ladakh and the Himalayas for feeding and roosting. 15 species
of ducks and two species of geese (Order: Anseriformes), cover over
70% of the migratory birds which visit this lagoon annually. The
ducks and geese are followed by coots, rails and cranes (Gruiformes)
15%; waders/shore birds (Charadriformes) 12%; pelicans (Pelecaniformes)
1.5%; grebes (Podicipediformes) 1%; kites, eagles etc. (Falconiformes)
and kingfishers (Coraciformes) 0.5%.
Chilika holds the
highest concentration of waterfowl. The 2004 survey estimates total
of 8, 66,477 birds representing 137 species of which 85 are migrant
species. Waterfowl visitation to Chilika in 2004 was 1.9 times the
number in comparison to the year 2003. Population status of waterfowl
in the entire Chilika lagoon vis-à-vis the population in
Nalaban Sanctuary in the different years as under:
Number of birds as per survey estimate
In Chilika during
the current bird migration season, maximum congregation of waterfowl
(migratory and local) was observed in peripheral marshy areas of
the Chilika lagoon such as: Kalupada ghatt, Manglajodi, Sorana,
The other vertebrate fauna includes:
· 321 species of fish and crab (fresh water, estuarine and
· 7 species of amphibians,
· 30 species of reptiles (12 species of lizards and 18 species
of snakes) and
· 18 species of mammals.
Two major crabs species (Scylla serreta and Neptunus pelagicus),
available in Chilika are of commercial importance.
and endangered species also included in the Schedule-1 of the Wildlife
Protection)Act ) available in the lagoon are:
· Barkudia insularis, a limbless lizard/skink (this skink
is named after the "Barukuda" island of the lake);
· an aquatic mammal i.e., Irrawaddy dolphin, Orcaella brevirostris
· Fishing cat( Felis viverrina),
· White bellied sea eagle (Haliaeetus leucogaster), White
spoon bill (Platalea leucorodia), Osprey (Pandion haliaetus), and
· Spoon billed sandpiper (Eurynorhynchus pygmeus).
The population of Irrawaddy or Snubfin dolphins, Orcaella brevirostris
(locally known as "Bhuasuni Magar") is threatened due
to intensive fishing and plying of mechanised boats in the lake.
At present there are about 80-90 Irrawaddy dolphins in the entire
lake. A small population of Bottle nosed dolphin, Sousa chinensis
also migrate in to the lagoon from the sea.
OF OLIVE RIDLEY SEA TURTLES
The mass nesting beach (rookery) along the Chilika coast is at Rushikulya
which is located at the southern Odisha coast. It spreads over six
km. stretching from the coastline in front of village Purunabandh
(one Km north of Rushikulya river mouth) to the beach in front of
Kantiagada village of Ganjam District. The nesting beach is much
wide, more or less flat with scattered sand dunes of 1 - 2 m high.
The average beach width is about 100 m from near the high tide line,
though at some places the width of the beach is more than 100 m.
About 2,00,000 turtles estimated to have nested in this rookery
in the arribada of March, 1994. In subsequent years there was a
decline in the number of turtles nesting at this rookery (1994-95:
0.60lakhs; 1995-96: 1.18 lakhs; 1996-97: 0.25 lakhs; 1997-98: 0.085
lakhs). There was no mass nesting in this rookery during 1998-99,
1999-2000 and 2002. However, a total of 1.59 lakh turtles came to
the Rushikulya rookery during the first mass nesting period of 2000-01.
The first mass nesting at this rookery continued over a 7 days period
starting from 26th February to 4th March 2001. The mass nesting
figures for the last three years are as follows (2001-02:0.35 lakhs;
2002-03:2.8 lakhs; 2003-04: 2.01 lakhs).
Chilika Lake is
threatened by siltation, eutrophication, change in salinity regime,
proliferation of freshwater weed, increased aquaculture activities,
changes in species composition, depletion of bio- resources, and
decrease in fish population etc.
People have been
using migratory birds arriving in Chilika for wintering as a source
of protein supplement for quite some time. With the passage of time,
this source of protein supplement has also become a source of livelihood
for them. The inaccessibility of certain pockets due to weed infestation
has boosted their activity as they find easy escape routes in these
In a major intervention
to manipulate the lake hydrology, a new mouth was opened near Ramabhartia
in the year 2000 by the Chilika Development Authority (CDA), Bhubaneswar
to let fresh ingress of seawater into the lake. The results of this
intervention indicate that the salinity levels inside the lagoon
have increased to certain extent in comparison to previous years,
which apparently has led to decrease in the weed growth area and
increase in fish catch. Impact of this manipulation (increased salinity
level in the lake) on the ecosystem of the lake as a whole and Nalaban
Sanctuary in particular and on the population of migratory birds
/ waterfowl in the lake needs closer assessment.
In an innovative
experiment to wean the poachers away from poaching, a massive awareness
programme has been undertaken and bird protection committees have
been formed. These committees assist the Forest Department in their
protection efforts during the migratory season. In some areas, like
Mangalajodi and Bhusandpur, the response from the villagers has
been encouraging. These efforts are supplemented with the establishment
of anti-poaching camps at strategic points along the coast line.
To encourage eco-tourism, training camps for eco-guides and boat-man
associations at Balugaon and Satpada are being organised.
Habitat development inside the sanctuary is being done with funds
received from Govt. of India and Chilika Development Authority.
These measures include raising up of plantations, digging and renovation
of creeks and digging of pon
CONSERVATION AND MANAGEMENT STRATEGY
The State Environment
Department and the Chilika Development Authority have taken several
measures for conservation and management of this unique wetland
and its rich biodiversity, with the support of the Ministry of E
&F, Govt. of India. These measures include:
· Protection of migratory waterfowl and other species prone
to poaching for meat.
· Catchments area treatment
· Weed control
· Restoration of the feeding and roosting habitat of water
· Pollution control
· Creation of awareness about the values and functions of
· Research and development activities
· Community participation
· Capacity building
· Building of Data base of the lagoon
· Promotion of eco-tourism
The changing profile
of the lake has led to new challenges. The bird congregation, which
was largely confined to Nalaban and other four to five areas, has
now dispersed to peripheral areas such as Kalupada, Mangalajodi,
and Bhusandpur, etc. This has posed a problem of protection of birds
due to difficulty in accessibility of the area and constraint of
resources. Increase in tourism inside Chilika has given rise to
death of Irrawaddy dolphins, which may at a later stage be detrimental
to the overall population of these endangered dolphins. This, however,
has also offered opportunities to work hand in hand with other stakeholders
working in the area for overall conservation of the lagoon.