06-bioresourcesstatu.. - M. S. Swaminathan Research Foundation
06-bioresourcesstatu.. - M. S. Swaminathan Research Foundation
06-bioresourcesstatu.. - M. S. Swaminathan Research Foundation
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Table3:Distributionofmajorvasrularhydrophytes at differentsectorsofChilikalagoon.<br />
Submerged Vegetation<br />
Potamogeton pectinatus (NGS)<br />
P. nodosus (N)<br />
Najas laveo/ata (NGS)<br />
Ruppia maritima (GS)<br />
Hydrilla verticillata (N)<br />
Vafiisneria spiralis (N)<br />
Ceratophyllum demersum (N)<br />
Myriophyllum oliganthum (N)<br />
Hafophifa ovalis(GS)<br />
H. beccarii (GS)<br />
Emergent Vegetation<br />
Schoenop/ectus /ittoralis (NGS)<br />
S. articu/atus (N)<br />
Phragmites karka (N)<br />
Cyperus compressus (N)<br />
Eleocharis dulce (N)<br />
Typha angustata iN)<br />
Fimbristylis cymosa (N)<br />
Pofygonum flaccidum (N)<br />
Myrostachya wightii (N)<br />
Panicum pa/udosum (N)<br />
P. repens (NG)<br />
P. wa/ense (N G)<br />
Najas raveo/ata make the highest contribution to<br />
the wet-weight biomass of submerged vegetation in<br />
the entire lake (Respond Project, 1998;Mohanty et<br />
al., 2001).<br />
Mlr-91 Ajx-95<br />
fuKxl<br />
Figure 5. Percentage of wet-weight biomass 01 major<br />
submerged macrophytes in northern sector of<br />
Chfllka Lagoon.<br />
In the weed infested northern sector the maximum<br />
biomass recorded for floating and emergent<br />
vegetation are 3400 and 7500 glm' respectively.<br />
Figure 5 depicts the inter annual variation in<br />
biomass percentage of the major submerged<br />
macrophytes. It is observed that Hydrilla<br />
verticillata and Vallisneria spiralis have large<br />
variability as compared to other species but<br />
having opposite trends. Observed salinity<br />
variations in the northwestern sector (area of<br />
luxuriant weed growth) between March 1994 (0.27-<br />
0.36 %0) and May 1998 (6.08 - 10.80 %0) may<br />
account for the difference in the lagoon (Respond<br />
Project 1998).<br />
Raman and Satyanarayana (2002) reported the<br />
occurrence of 42 species of phyotplankton<br />
Northern (N), Central (C) and Southern (S)<br />
209<br />
Floating Vegetation<br />
Eichhornia crassipes (N)<br />
Pistia stratiotes (N)<br />
Azolla pinnata (N)<br />
Lemna minor (N)<br />
$a/vinia natans (N)<br />
Nymphoides indica (N)<br />
N. hydrophylla (N)<br />
Nymphaea nouchali (N)<br />
Marsilea quadrilolia (N)<br />
Chilika Lake<br />
represented by cynophyceans, bacillariophyceans,<br />
dinopbyceans, chlorophyceans and<br />
euglenophyceans. Of theses the cyanophyceans,<br />
represented mostly by Oscilltoria, constituted the<br />
bulk (81%) of the total phytoplankton.<br />
ii. Fauna<br />
The faunal diversity of Chilika is very much rich.<br />
It has been studied rather extensively by the<br />
scientists during 1915-24 (Annandale, 1915, 1924)<br />
and later during 1985-87 (ZSI, 1995). Sporadic<br />
attempts were also made in between by few<br />
investigators (Jones and Sujansinghani, 1954; Roy<br />
and Sahoo, 1957; Menon, 1961; Rajan et al., 1968;<br />
Sharma and Satpathy, 1978; Sarma and Rao, 1980;<br />
Rao, 1987; Dandapani, 1992). Phytal fauna (Sarma<br />
and Satapathy, 1978) and meiofauna (Sarma and<br />
Rao, 1978) have also been studied, which included<br />
animal groups: foraminifera, nematoda,<br />
oligochaeta, polychaeta, copepoda, ostracoda,<br />
amphipoda, isopoda, tenaidea, insect larvae,<br />
halacaridae, cumacidaceae, kinorahyncha,<br />
gastropoda, plelecypoda, rotifera etc. There is a<br />
wtde variety of animal life forms representing<br />
various groups of animal kingdom, ranging from<br />
protozoa, porifera, polyzoa, brachiopoda,<br />
coelenterata, ctenophora, isopoda, echiura,<br />
sipuncnla, chaetoguatha, platyhelminthes,<br />
annelida, crnstacea, insecta, arachnida, molluska<br />
to pisces, amphibia, reptilia, aves and mammalia<br />
(Table 5). Chilika lagoon hosts over 729 species of<br />
wetland fauna including 217 species of fishes and<br />
156 species of birds, 7 toad and frogs and 30<br />
snakes and lizards (ZSI, 1995).<br />
Chilika and its islands harbour numerous insects<br />
fauna like coleopteran, odonata, butterflies,