Biology Reference
In-Depth Information
Table 1. Summary of Dolphin sightings in the River Ganges between Buxar and Manihari ghat during 2005 - 2007.
Sum of group size
estimates from Primary &
Secondary sightings
Percentage of
error
Sightings
by
Primary
observer
Sightings
by
Secondary
observer
in
Survey
distance
(km)
Boat's
speed
(km/hr.)
Date
(Survey direction)
sightings
missed
Sightings/
km.
Dolphi
n/ km.
No. of calves
(percentage)
by
Best
High
Low
Primary
observer
November, 05(US)
507.4
6.32
321
97
664
750
578
23.21
0.84
1.31
77 (11.60)
November, 05(DS)
494.8
11.19
262
81
517
576
465
23.62
0.71
1.04
62 (11.99)
March, 06 (US)
517.8
6.05
274
91
576
692
514
24.93
0.72
1.11
47 (8.16)
March, 06 (DS)
499.2
9.72
200
78
418
496
370
28.06
0.58
0.84
39 (9.33)
May - June,
06(US)
506
6.24
284
103
559
644
502
26.61
0.78
1.1
88 (15.74)
May - June,
06(DS)
499.5
10.38
223
75
439
507
392
25.17
0.61
0.93
68 (15.49)
December, 06
(US)
517.1
6.34
437
110
808
931
729
20.11
1.08
1.56
67 (8.29)
December, 06
(DS)
501
10.22
324
72
559
668
486
18.18
0.81
1.12
58 (9.68)
March, 07 (US)
513.1
6.46
398
79
706
813
635
16.56
0.94
1.38
50 (7.08)
March, 07 (DS)
506.9
10.63
257
63
482
584
411
19.69
0.64
0.95
37 (7.68)
May - June,
07(US)
514.8
6.05
372
89
631
755
517
19.31
0.91
1.23
72 (11.41)
May - June,
07(DS)
508.5
10.19
299
78
577
700
470
20.69
0.76
1.13
69 (11.96)
Mean
±
S.D. (US)
512.7
±
4.96
6.24
±
0.17
348
±
65.26
95
± 10.96
657
±
91.75
764
±
100.15
579
±
89.03
21.79
± 3.78
0.88
± 0.13
1.28
±
0.17
67 (10.38)
±
15.84 (3.21)
Mean
±
S.D. (DS)
501.7
±
5.15
10.39
±
0.49
261
±
46.03
75
± 6.41
499
±
63.96
589
±
82.62
432
±
47.61
22.57
± 3.72
0.69
± 0.09
1.00
±
0.11
56 (11.02)
±
14.15 (2.74)
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