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JOURNAL OF MOSQUITO RESEARCH
85
The analysis of variance of different mosquito genera
collected in the month of March 2012, revealed
significant difference (F=11.97; df=2, 8; P<0.01). The
mean comparison test (LSD) for different mosquito
genera is presented in the Table 4 the results revealed
that
Aedes
(877.60) and
Culex
(781.80) genera were
the most prevalent, both were statistically at par,
followed by genus
Anopheles
(474.60). The analysis
of variance of different mosquito genera collected in
the month of April 2012 revealed significant
difference (F=66.32; df=2, 8; P<0.01). The mean
comparison test (LSD) for different mosquito genera
is presented in the (Table: 4) the results revealed that
Aedes
(1151.0) and
Culex
(858.25) genera were the
most prevalent; both were statistically at par, followed
by genus
Anopheles
. The analysis of variance of
different mosquito genera collected in the month of
May 2012 revealed significant difference (F=94.73;
df=2, 8; P<0.01). The mean comparison test (LSD) for
different mosquito genera is presented in the (Table 4).
The results revealed that
Aedes
(418.20) and
Culex
(343.70) genera were the most prevalent, both were
statistically at par, followed by genus
Anopheles
.
2 Discussion
Present study indicates that different species of
mosquitoes were present in LCWU campus including
3 genera of
Aedes
,
Culex
and
Anopheles
and species
captured were
Aedes aegypti
,
Culex quinquefasciatus
,
Anopheles stephensi
and
Anopheles subpictus
. These
species were related to the suitable breeding sites of
LCWU where the seeping, drainage and dampness
were present. Bamboo traps proved quite useful in
capturing the larvae of different mosquitoes. The
highest number of mosquitoes was found in the month
of May because of suitable temperature and breeding
environment. A highly significant difference was
noted in these three genera in the month of March,
April and May (P<0.05). So all these genera were
abundant in these months due to favourable
temperature.
The available data provides the seasonal fluctuations
of the population dynamics of different mosquitoes.
Statistical analysis reveals that the population of the
genera of
Aedes
and
Culex
increases with temperature
and of the population of
Anopheles
decreases. The
hieghest density of
Anopheles
was found in the month
of February. This study indicates the peak time of
rising of the mosquitoes so that the proper
precautionary measures can be taken before any
outbreak of epidemic like DF or DHF. It is very
important to know about the mosquito’s habit and
seasonal abundance to control it properly.
Studies on the seasonal fluctuation of
Aedes aegypti
were undertaken in different localities of Delhi, during
2000. The
Aedes aegypti
population was found to be
prevalent in all the localities in Delhi. Water coolers
and tires were found to be the preferred breeding
habitats of
Aedes mosquitos
in the city.
Aedes aegypti
,
being hygroscopic, showed a phenomenon of annual
pulsation. It tends to move to mother foci in the
central areas of the city, which are humid in the dry
season, and spread out during the wet season. Out of
103 778 houses surveyed, 20 513 houses and 3 547
containers were reported positive for
Aedes aegypti
.
The house container and larval indices were very high
during the post-monsoon season (Sharma et al., 2000).
According to our study the rich abundance of
Aedes
aegypti
was found in the months of March, April and
May in LCWU, Lahore Campus. It is probably due to
the suitable temperature for the breeding of
mosquitoes. A spray named as K-Othrine EC15 was
also applied in the Campus on 17th May, so no
mosquito larvae was found till the last week of May.
The study showed that the highest densities of
Ae.
aegypti
were recorded in the short dry season in
Yopougon and Cocody, and at the beginning of the
long rainy season in Adjamé and Treichville in the
Gulf of Guinea. The lowest densities were recorded
during the long dry season (from January to February)
in all the five study sites (Coulibaly et al., 2010). We
also record the lowest densities in the month of
January to February. Even we found some of the
population at the last week of February. Because the
temperature in these months was about (12~14)
℃
and it was not appropriate for the larval growth.
In an investigation, the highest density was observed
from the rural areas of east and west Godaveri
Districts of Andhra Pradesh, India. The highest
density of
Culex quinquefasciatus
was found in
September, October, December; the lowest were
Journal of Mosquito Research