Ecological and anthropogenic covariates ... - GANGAPEDIA
Ecological and anthropogenic covariates ... - GANGAPEDIA
Ecological and anthropogenic covariates ... - GANGAPEDIA
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Variable<br />
(type)<br />
Stage Height<br />
(S)<br />
Discharge (S)<br />
Water depth<br />
(S)<br />
Equipment used<br />
Measurement<br />
Details<br />
Staff Gauge Daily (in)<br />
LYNX cup type<br />
water current<br />
meter; Float<br />
method<br />
Hondex Digital<br />
Depth Sounder<br />
3394<br />
Nikon Monarch<br />
Channel width<br />
Laser 800 6x<br />
(S)<br />
Range finder<br />
Temperature<br />
(S)<br />
Shoreline<br />
substrate type<br />
(C, D)<br />
Basking Site<br />
(S)<br />
HOBO Pendant<br />
Temp. Data<br />
Loggers (Part #<br />
UA-001-XX)<br />
Six<br />
measurements<br />
bet. Jan-May<br />
2010; m 3 /sec<br />
Measured every<br />
0.5 km;<br />
continuous (ft)<br />
Measured every<br />
0.5 km;<br />
continuous (m)<br />
Logged at 30<br />
min intervals<br />
Soil texture tests Observation<br />
Observation<br />
15<br />
Covariates<br />
Change in river<br />
level<br />
Depth at 10m<br />
intervals across<br />
channel width<br />
Mean channel<br />
width (m)<br />
Expected effects on<br />
gharial distribution/<br />
activity<br />
Increased clustering of<br />
individuals within<br />
deeper sections with<br />
decrease in water level<br />
Correlated with stage<br />
height<br />
Size-related preference<br />
for depth; larger<br />
individuals (deep<br />
segments); smaller<br />
individuals (less deep<br />
segments)<br />
Correlated with depth<br />
(1) Air <strong>and</strong> water<br />
temperatures (2)<br />
Mean, maximum<br />
<strong>and</strong> minimum ( o Basking activity<br />
C)<br />
Types - Clayloam,<br />
S<strong>and</strong>,<br />
Gravel,<br />
S<strong>and</strong>stone-rock.<br />
Extent per<br />
segment<br />
Substrate; slope at<br />
0, 1, 2 m; depth at<br />
5m intervals<br />
inversely proportional<br />
to temp; reduced<br />
proportion of basking<br />
animals<br />
Preference for areas<br />
with greater s<strong>and</strong><br />
extent<br />
Preference for areas<br />
with suitable basking<br />
sites.<br />
Table 1: Details of habitat <strong>covariates</strong> measured, Variable types: S - scalar,<br />
Categorical, D - Discrete