|
|
| |
| Articles
by
Ashok K. Pandit |
Total Records (
2 ) for
Ashok K. Pandit |
|
 |
| |
|
| |
Javaid Ahmad Shah
and
Ashok K. Pandit
|
| |
The present study scrutinizes the seasonal variation in the
distribution of crustacean zooplankton in relation to physico-chemical liminology
of Wular lake. Water samples were collected from five study sites during September
2010-August 2011. Remarkable spatial and temporal variations were observed among
the different study sites. Among the parameters recorded water temperature showed
positive correlation with pH (p<0.01) and orthophosphate (p<0.05).Transparency
showed a significant negative correlation with total alkalinity (p<0.01),
free carbon dioxide (p<0.01) and ammonical nitrogen (p<0.01). Crustacean
zooplankton were collected by filtering 100 L lake water through a 30 μm
nytal mesh and preserved in 4% formalin. A total of 42 taxa of crustacean were
recorded, among them 23 species belonged to Cladocera, 16 to Copepoda and only
3 to Ostracoda. Species diversity and density depicted an abrupt up surge on
the advent of warmer period (extending from March). Among the various sites
a maximum of 40 species were recorded from a single biotope (site III) against
the minimum of only 17 species being recorded from site I. Bray-Curtis cluster
analysis showed close similarity (0.928-0.944%) between summer and autumn in
terms of species diversity. Pearson correlation coefficient of the various physico-chemical
parameters of water with crustacean zooplankton depicted that not only a single
but multiple factors govern over the distribution and diversity of crustacean
in the lake. |
|
|
| |
|
| |
Sami Ullah Bhat
,
Gowhar Ahmad Dar
,
Aadil Hamid Sofi
,
Naseer Ahmad Dar
and
Ashok K. Pandit
|
| |
Three macrophytic species namely Ceratophyllum demersum, Hydrilla verticillata and Potamogeton lucens were investigated for the macroinvertebrate association in Manasbal Lake. A total of 15 macroinvertebrate taxa were reported from these macrophytic species belonging to three phyla including Annelida, Mollusca and Arthropoda. Arthropoda was the dominant phyla comprising of class Insecta, Crustacea and Arachinida. Annelida was the second dominant phyla represented by two classes Hirudinea and Oligochaeta. Mollusca were only represented by families, Lymnaeidae and Planorbidae. All the three phyla showed dominance pattern with respect to macrophytic species in the order of Ceratophyllum demersum followed by Hydrilla verticillata and then Potamogeton lucens. The results of study also showed that, the Ceratophyllum demersum comparatively harboured large density of macroinvertebrates than the other two macrophytic species, despite the fact that the total number of macroinvertebrate taxa remained the same on all the three macrophytic species thereby reflecting homogeneity of habitats. Among the insects, Chironomidae was dominant taxa on Ceratophyllum demersum followed by Hydrilla verticillata and then Potamogeton lucens. |
|
|
|
|
| |
|
