Alterations in Physico-chemical Parameters of Water and Aquatic Diversity at Maneri-Bhali Phase I Dam Site on River Ganges in District Uttarkashi, Uttarakhand - Management of Natural Resources in a Changing Environment - page 103

Table 2 Macro invertebrate
fauna of river Ganges before
and after dam wall at Maneri
Bhali Phase I hydro-electric
power project

After dam Before dam

Presence/absence Presence/absence

Crustaceans + +

Cladocera ++ +

Bosmania + +

Daphnia + +

Copepod − +

Cyclops + +

Diptomus − +

Rotifera + +

Kertella − +

Rotaoria − +

Nolthoca − +

Species richness 6 11

Table 3 Physico-chemical parameters of river Ganges before and after dam wall at Maneri Bhali
Phase I hydro-electric power project
Maneri phase I - before
dam site I

Maneri phase I - after
dam site I

t -test-paired P
value

Sig. level 0.05,
95 % CI Mean SEM Mean SEM

Temp. Max (ﾰC) 14.46 0.99 17 1.16 S*

Temp. Min (ﾰC) 10.46 0.73 12 0.80 S*

pH 7.2 0.14 7.30 0.12 NS

CO 2 (mg/L) 2.71 0.27 3.09 0.32 NS

Alk (mg/L) 21.26 1.35 20.15 1.45 NS

DO (mg/L) 10.02 0.30 8.42 0.30 S*

Conductance (siman/
cm 2 )

116.53 3.66 111.46 9.22 NS

Ca ++ (mg/L) 52.65 3.21 51.46 3.27 NS

TH (mg/L) 77.76 6.42 72.69 7.03 NS

Cl − (mg/L) 19.90 2.77 22.11 2.12 NS

Mg ++ (mg/L) 5.54 1.45 6.08 1.46 NS

TDS 73.76 2.41 76.56 2.94 NS

TUR nNTU) 27.80 11.75 41.19 15.57 NS

Dr. RC Sharma ( 2003 ) but that too studied the effect of excessive road construction
on river eco-system.
Aquatic habitat includes all of the physical, chemical and biological features of
the environment needed to sustain life. Examples include suitable water quality and
habitat-migration routes, spawning grounds for fishes, feeding and resting sites and
shelter from predators and adverse environment conditions (Orth and White 1993 ),
phytoplankton's, zoo-plankton's and other biotic components. Therefore habitat
quality influences the numbers, sizes and species of aquatic eco-system that can be
sustained in a particular area (Milner et al. 1985 ), and changes to that habitat can