Abstract:The viability of Aedes aegypti eggs was assessed in the Amazon region. The eggs were maintained under different conditions: indoors (insectarium) and outdoors (natural environment), as well as in different storage types (plastic cup, paper envelope, plastic bag) for different days. Egg viability was measured as the mean of hatchings observed from egg-bearing sheets of filter paper immersed in water, using three sheets randomly selected from each storage type and at both sites. There were significant difference… Show more
“…However, important parameters for population dynamics and vectorial capacities such as fecundity, fertility, and mosquito size were not affected by quiescence. In agreement with previous studies on egg quiescence in A. aegypti indicating differential egg viability [ 12 , 17 , 21 , 22 , 45 , 46 , 47 ], in our study, the A. aegypti population from Recife proved to be more resistant to desiccation (130 days, with high egg viability until three months of quiescence), than mosquitoes from the Aracaju population (100 days, with a high hatching rate up to 40 days of quiescence). Even so, the overall quiescence was shorter compared with other similar studies in which maximum larvae hatching was recorded from 150 days up to more than a year [ 12 , 22 , 46 , 47 , 48 ].…”
The strategy of Aedes aegypti to prolong embryonic viability by quiescence has severe implications for geographic expansion and maintenance of mosquito populations in areas under control measures. We evaluated the effects of quiescence on biological parameters directly or indirectly associated with population dynamics and vectorial capacity in populations of this mosquito species from two Brazilian municipalities characterized as dengue, chikungunya, and Zika transmission areas. Egg viability, initial hatching time, post-embryonic development time, adult emergence rate, sexual proportion, adult size, fecundity, and fertility were analyzed using eggs stored for 10, 40, 70, 100, 130, and 160 d. Quiescence time reduced overall egg viability and post-embryonic development time in both municipalities but was more costly in Aracaju (100 d, 8 d) than in Recife (130 d, 7.5 d). Emergence rates increased in Recife when the eggs were older, but not in Aracaju. Significant deviations in sexual proportion, with male predominance, were observed in both populations. Initial hatch, fecundity, fertility, and adult size did not significantly influence egg quiescence time. These results indicate intrinsic and differential characteristics for each A. aegypti population, suggesting a differential cost of quiescence for population dynamics parameters that can indirectly affect vectorial capacity and control measures.
“…However, important parameters for population dynamics and vectorial capacities such as fecundity, fertility, and mosquito size were not affected by quiescence. In agreement with previous studies on egg quiescence in A. aegypti indicating differential egg viability [ 12 , 17 , 21 , 22 , 45 , 46 , 47 ], in our study, the A. aegypti population from Recife proved to be more resistant to desiccation (130 days, with high egg viability until three months of quiescence), than mosquitoes from the Aracaju population (100 days, with a high hatching rate up to 40 days of quiescence). Even so, the overall quiescence was shorter compared with other similar studies in which maximum larvae hatching was recorded from 150 days up to more than a year [ 12 , 22 , 46 , 47 , 48 ].…”
The strategy of Aedes aegypti to prolong embryonic viability by quiescence has severe implications for geographic expansion and maintenance of mosquito populations in areas under control measures. We evaluated the effects of quiescence on biological parameters directly or indirectly associated with population dynamics and vectorial capacity in populations of this mosquito species from two Brazilian municipalities characterized as dengue, chikungunya, and Zika transmission areas. Egg viability, initial hatching time, post-embryonic development time, adult emergence rate, sexual proportion, adult size, fecundity, and fertility were analyzed using eggs stored for 10, 40, 70, 100, 130, and 160 d. Quiescence time reduced overall egg viability and post-embryonic development time in both municipalities but was more costly in Aracaju (100 d, 8 d) than in Recife (130 d, 7.5 d). Emergence rates increased in Recife when the eggs were older, but not in Aracaju. Significant deviations in sexual proportion, with male predominance, were observed in both populations. Initial hatch, fecundity, fertility, and adult size did not significantly influence egg quiescence time. These results indicate intrinsic and differential characteristics for each A. aegypti population, suggesting a differential cost of quiescence for population dynamics parameters that can indirectly affect vectorial capacity and control measures.
“…aegypti eggs to enter diapause allowed their reproductive success. The diapause may extend for six months or more, until the eggs get in contact with water in the container again, and then hatching occurs 32 . In the cemeteries, it is not possible to control the rain factor, therefore, it is important to have a method to control the presence of larvae and pupae in the vases.…”
Aedes aegypti is the vector of the arboviruses causing dengue,
chikungunya and zika infections in Mexico. However, its presence in public
places has not been fully evaluated. In a cemetery from Merida, Yucatan, Mexico,
the productivity of Ae. aegypti, the gonotrophic cycle, and the
presence of Ae. aegypti females infected with arboviruses were
evaluated. Immature and adult mosquitoes were inspected every two months between
April 2016 to June 2017. For the gonotrophic cycle length, the daily pattern of
total and parous female ratio was registered and was analyzed using time series
analysis. Ae. aegypti females were sorted into pools and
assayed for flavivirus RNA by RT-PCR and Sanger sequencing. Aedes
aegypti immatures represented 82.86% (8,627/10,411) of the
collection. In total, 1,648 Ae. aegypti females were sorted
into 166 pools. Two pools were positive; one for dengue virus (DENV-1) and the
other for zika virus (ZIKV). The phylogenetic analysis revealed that the DENV-1
is more closely related to isolates from Brazil. While ZIKV is more closely
related to the Asian lineage, which were isolates from Guatemala and Mexico. We
report some evidence of vertical transmission of DENV-1 in nulliparous females
of Ae. aegypti. The gonotrophic cycle was four and three days
in the rainy and dry season, respectively. The cemetery of Merida is an
important focus of Ae. aegypti proliferation, and these
environments may play a role in arboviruses transmission; probably limiting the
efficacy of attempts to suppress the presence of mosquitoes in domestic
environments.
“…The two shape parameters of this Beta distribution were derived using the average (0.076) and low 95% CI (0.023) proportion of Ae. aegypti eggs hatched after being submerged in plastic containers filled with water in field conditions (Soares-Pinheiro et al, 2016).…”
Section: Description Of the Population Dynamical Modelmentioning
Highlights• European coasts present favourable conditions for Aedes aegypti establishment • We assess the species introduction and establishment using a process-based model • We selected five ports: Algeciras, Barcelona, Venice , Genoa and Rotterdam • Algeciras and Barcelona were the most suitable areas for the species establishment • Climate change could make more suitable the northernmost study areas Abstract Aedes aegypti are feared invasive mosquitoes as they transmit pathogens which 1 cause debilitating diseases in humans. Although mainland Europe has not yet wit-2 nessed re-establishment and diffusion of Ae. aegypti populations, several urban areas 3 along coastlines represent suitable habitats for the species. In addition, European 4 coastal areas are characterized by a high exotic species propagule pressure, due to the 5 dense international ship traffic.6
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.