Jammu and Kashmir Academy of Art, Culture and Languages
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Population Dynamics of Genus Keratella in Dal Lake, Kashmir
Get PDFRotifera as a groups as well as a particular rotifer species are able to
inhabit a variety of environments and are known to be mostly typically littoral
forms. Rotifers are sensitive to changes in water quality through eutrophication
process and play an important role in trophic dynamics of lake ecosystems. The
community structure of rotifers within shallow and macrophyte dominated
lakes is affected by a number of environmental factors. The valley of Kashmir
is endowed with a unique geographical position. The valley is famous for its
lakes, crystal clear tarns, mountains, snow and spring fed meadows and alpine
forests. Kashmir is unique in India in having numerous lakes which grade from
oligotrophic (Marsar, Vishensar, Sheshnag, Kishensar, Alpather, Kounsarnag
etc), mesotrophic (Mansbal, Nilnag etc) and eutrophic (Dal, Anchar etc).The
Dal lake is the second largest lake of Kashmir covering an area of about 11.56
sq km. The lake is surrounded by Zabarwan hills on three sides. It is a shallow
open drainage type water body divided into five basins- Hazratbal basin,
Gagribal basin, Nishat basin, Nigeen basin and Brarinambal basin. For the
present study five sites were selected in different basin of the lake and each site
represents ecologicaly different habitats in the lake. Site 1 was located near
Telbal Nallah, Site 2 in Hazratbal basin, Site 3 in Nigeen basin, Site 4 near
Centaur hotel in Nishat basin and Site 5 in Brarinambal basin. Water samples
were collected for different physical, chemical and biological parameters on
monthly basis form Jan. 2011 to Dec. 2011. Standard methods proposed by
Welch (1984), APHA (1995), Mackereth et al. (1978) were employed for
determination of physico-chemical parameters. Indentification of different
zooplankton species was done with the help of standard taxonomic works by
Edmondson (1959) and Pennak (1978).The Dal lake is in a state of stress and
as a result ecological conditions have undergone tremendous changes. The
present study was undertaken to study the population dynamics of rotifera with
special reference to genus Keratella, other zooplankton associations and physic-chemical environment. Keratella is an important genus of eurotatorian
rotifers. Different species of genus Keratella can be distinguished on the basis
of spination and sculpture of dorsal plate. In the present study only two species
of Keratella were recorded i.e. keratella cochlearis and Keratella quadrata.
Keratella cochlearis was the dominant one among two species.
Water temperature in the lake fluctuated from 3.5oC to 26oC and a close
relationship was recorded between water temperature and air temperature.
Transparency fluctuated form site to site and least transparency was found in
Brarinambal. The lake was alkaline throughout the year as pH always remained
above 7.0. Conductivity value ranged from 163μs/cm to 810μs/cm. Dissolved
oxygen ranged from 0.8mg/l to 9.8m/l. Lower values were recorded during
summer and higher during winter. Chloride concentration ranged from
11.9mg/l to 71.3mg/l. Total alkalinity ranged from 94.8mg/l to 360.9mg/l. No
definite trend was recorded in ammonical nitrogen concentration throughout
study period. The concentration of nitrate ranged from 72.1mg/l to 925.2mg/l.
Nitrite nitrogen was present in low concentration. Increase in total phosphorous
concentration indicates that lake is eutropic in nature and Brarinambal basin is
in its advanced hypereutrophic stage. During present study a total of 42 other
species of zooplankton were recorded of which 20 belonged to rotifera, 18 to
cladocera and 4 to copepoda. On the basis of physico-chemical and biological
features Brarinambal basin stands quite different from other basins in most of
its limnolgical features
Greetings, Modes of Address and Politeness Expressions in Kashmiri Language: A Cross-Gender Study
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Economic Potential Of Handicraft Sector In J&K With Special Reference To Shawl Industry In District Srinagar
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Get PDFEvaluation of fungitoxicants against Alternaria alternata causing umbel blight disease of kala zeera (Bunium persicum)
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