16.06.2013 Views

06-bioresourcesstatu.. - M. S. Swaminathan Research Foundation

06-bioresourcesstatu.. - M. S. Swaminathan Research Foundation

06-bioresourcesstatu.. - M. S. Swaminathan Research Foundation

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

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,

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!