Journal of Mosquito Research 2015, Vol.5, No.13, 1-5
2
study to evaluate the degree of comparative
man-biting activities of
Ae. aegypti
and
Ae. albopictus
both at indoors and outdoors in different months
through the seasons and determine the intensity of
man/vector contact of the two species.
3 Results
Altogether 248
Ae. aegypti
mosquitoes were collected
off human baits, of which 77 (31.04%) and 171 (65.95%)
were off indoor and outdoor baits respectively. Though
Ae. aegypti
mosquitoes were found to be attracted to
human baits throughout the day, the biting peak was
noted during 8-9 a.m. (60 i.e. 24.2%) followed by
another peak during 5-6 p.m. (40 i.e. 16.1%), both at
indoor and outdoor locations (Table 1). In the first,
second, third and fourth quadrant of the day, 98
(39.52%), 42 (16.93%), 28 (11.29%) and 80 (37.26%)
Ae.
aegypti
mosquitoes were collected respectively. Peak
biting activity of
Ae. aegypti
was found in the month
of July [52 (20.96%)] followed by August [37
(14.91%)] (Table 2). In the winter (Nov – Feb), summer
(Mar – June) and rainy seasons (Jul – Oct) 38
(15.3 %), 62 (25 %) and 148 (59.7%)
Ae. aegypti
mosquitoes were caught off human baits indicating
that 60% of this species was collected off human baits
in the rainy months.
Altogether 867
Ae. albopictus
mosquitoes were
captured off human baits, of which 183 (21.10%) and
684 (78.89%) were off indoor and outdoor baits
respectively.
Ae. albopictus
mosquitoes were attracted
to human baits throughout the day both at indoor and
outdoor. The peak biting activity was observed during
5-6 p.m. [135 (15.57%)] followed by two other peaks
during 4-5 p.m. [125 (14.41%)] and 3-4 p.m. [108
(12.45%)] (Table 1). In the first, second, third and
fourth quadrant of the day 172 (19.89%), 146
(16.83%), 76 (20.29%) and 368 (42.44%)
Ae. albopictus
mosquitoes were collected.
About 52% [449 (51.78%)] of
Ae. albopictus
mosquitoes
were caught off human baits, collectively from indoor
and outdoor locations between 2 p.m. and 6 p.m. The
peak biting activity was found in July [264 (30.4%)]
followed by August [207 (23.8%)]. In this study no
man landing activity of
Ae. albopictus
was observed
in the months of January, February and April, both at
indoor and outdoor. Only 19 (2.2%) man-landing
Ae.
albopictus
mosquitoes were collected between
December and April (Table 2). In the winter, summer
and rainy months, 74 (8.5%), 85 (9.8%) and 708
(81.7%)
Ae. albopictus
mosquitoes were captured off
human baits.
Both the species also landed on human baits beyond 6
a.m. to 6 p.m. both at indoors and outdoors (Table 3).
3.1 Season wise catches:
The number of man-landing
Ae. aegypti
in rainy
season (148) was higher (p<0.05) than those of
summer (62) and winter (38) [Z = 5.7966; Z = 7.910].
Number of this mosquito species landed in summer
was also higher (p<0.05) than that of winter [Z=2.4].
The number of man-landing
Ae. albopictus
in rainy
season (708) was higher (p<0.05) than those of
Table 1 House wise man-landing collection of
Aedes aegypti
and
Aedes albopictus
in a garden in Kolkata from 6 a.m. to 6 p.m.
Aedes aegypti
Aedes albopictus
Hour
Indoor
Outdoor
Total
Indoor
Outdoor
Total
6 a.m – 7 a.m.
4 (5.19)
9 (5.26)
13 (5.24)
4 (2.18)
23 (3.36)
27 (3.11)
7 a.m – 8 a.m.
10 (11.99)
15 (8.77)
25 (10.08)
17 (9.28)
56 (8.18)
73 (8.41)
8 a.m – 9 a.m.
22 (28.52)
38 (22.22)
60 (24.19)
17 (9.28)
60 (8.77)
77 (8.88)
9 a.m – 10 a.m.
5 (6.49)
13 (7.60)
18 (7.25)
18 (9.83)
36 (5.26)
54 (6.22)
10 a.m – 11 a.m.
2 (2.19)
13 (7.60)
15 (6.04)
2 (1.09)
42 (6.14)
44 (5.07)
11 a.m. – 12 a.m.
2 (2.59)
7 (4.09)
9 (3.63)
8 (4.27)
40 (5.84)
48 (5.53)
12 a.m. – 1 p.m.
1 (1.29
7 (4.09)
8 (3.22)
11 (6.01)
45 (6.57)
56 (6.45)
1 p.m. – 2 p.m.
3 (3.89)
6 (3.51)
9 (3.63)
6 (3.27)
33 (4.82)
39 (4.49)
2 p.m. – 3 p.m.
3 (3.89)
8 (4.68)
11 (4.43)
16 (8.74)
65 (9.50)
81 (9.34)
3 p.m. – 4 p.m.
4 (5.19)
12 (7.01)
16 (6.45)
18 (9.83)
90 (13.15)
108 (12.45)
4 p.m. – 5 p.m.
7 (9.89)
17 (9.94)
24 (9.67)
30 (16.39)
95 (13.88)
125 (14.41)
5 p.m. – 6 p.m.
14 (18.18)
26 (15.20)
40 (16.13)
36 (19.67)
99 (14.47)
135 (15.57)
Total
77 (100%)
171 (100%)
248 (100%)
183 (100%)
684 (100%)
867 (100%)
31.04%
68.95%
100%
21.10%
78.89%
100%
