Aedes aegypti mosquito - Dengue vector - research
Biogents mosquito traps - scientifically proven efficiency for Aedes aegypti
Biogents mosquito traps are scientifically proven as efficient at capturing Aedes aegypti mosquito, vector of the Dengue virus and Dengue Fever.
A list of scientific articles with can be consulted through the following link: Publication List on Biogents Traps
A list of scientific articles with can be consulted through the following link: Publication List on Biogents Traps
Biogents Mosquito traps
Through research we have identified suppliers of traps which have proven scientific efficiency at reducing mosquito population at various locations across the world (research about the efficiency of Biogents traps can be seen in our research section).
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Source: BG-Sentinel / Biogents
The two examples above demonstrate the efficiency of the BG-Sentinel (the professional trap and predecessor of Biogents Mosquitaire and Biogents Mosquitito traps) compared to other mosquito traps and "human target", even without the use of CO2. The graph to the right measures "biting presure" in "bites per hour" on a human volunteer and compares areas without Biogent traps compares to areas without traps. In this study in Cesena - Italy, the reduction in biting pressure of the Ae. albopictus during August is above 85%!
As of October 2012 we represent and supply Biogents units for retail as well as replacements.
Please do not hesitate to contact us if you wish more information or would like to discuss trade rates as well as alternative units which cover larger areas.
Mosquito traps are just one contribution to reduce the concentration of mosquitoes - prevention is essential.
As of October 2012 we represent and supply Biogents units for retail as well as replacements.
Please do not hesitate to contact us if you wish more information or would like to discuss trade rates as well as alternative units which cover larger areas.
Mosquito traps are just one contribution to reduce the concentration of mosquitoes - prevention is essential.
The significance of Carbon Dioxide
Carbon dioxide plays a subordinate role for a few mosquito species that have specialised in human beings. These especially include those that transmit diseases like malaria, dengue fever or yellow fever. These mosquitoes recognise humans mostly by their skin odour.
Therefore, the Biogents traps are still ideally suited for capturing these mosquito species without the addition of carbon dioxide. This especially applies to tiger mosquitoes (yellow fever mosquito, Aedes aegypti , or the Asian tiger mosquito,Aedes albopictus ), but certain house mosquitoes (especially Culex quinquefasciatus and related species) or a few malaria mosquitoes (Anopheles) as well.
Although the use of carbon dioxide can partly increase the capture rate significantly (introduction of CO2 demonstrated capture rate of Aedes aegypti increased by 28% from 46 to 59 mosquitoes over a 24h period), traps can also be used without it in regions where the gas is hard to obtain.
Therefore, the Biogents traps are still ideally suited for capturing these mosquito species without the addition of carbon dioxide. This especially applies to tiger mosquitoes (yellow fever mosquito, Aedes aegypti , or the Asian tiger mosquito,Aedes albopictus ), but certain house mosquitoes (especially Culex quinquefasciatus and related species) or a few malaria mosquitoes (Anopheles) as well.
Although the use of carbon dioxide can partly increase the capture rate significantly (introduction of CO2 demonstrated capture rate of Aedes aegypti increased by 28% from 46 to 59 mosquitoes over a 24h period), traps can also be used without it in regions where the gas is hard to obtain.
| fangleistung_biogent-mueckenfallen_mit_ohne_co2-catch_rates_biogents_mosquito_traps_with_without_co2.pdf |
Impact of weather (temperature and humidity) on Aedes aegypti mosquito
Madeira Weather forcast
Population Dynamics of Aedes aegypti and Dengue as Influenced by Weather and Human Behavior in San Juan, Puerto Rico
Abstract - Previous studies on the influence of weather on Aedes aegyptidynamics in Puerto Rico suggested that rainfall was a significant driver of immature mosquito populations and dengue incidence, but mostly in the drier areas of the island. We conducted a longitudinal study of Ae. aegypti in two neighborhoods of the metropolitan area of San Juan city, Puerto Rico where rainfall is more uniformly distributed throughout the year. We assessed the impacts of rainfall, temperature, and human activities on the temporal dynamics of adult Ae. aegypti and oviposition. Changes in adult mosquitoes were monitored with BG-Sentinel traps and oviposition activity with CDC enhanced ovitraps. Pupal surveys were conducted during the drier and wetter parts of the year in both neighborhoods to determine the contribution of humans and rains to mosquito production. Mosquito dynamics in each neighborhood was compared with dengue incidence in their respective municipalities during the study. Our results showed that: 1. Most pupae were produced in containers managed by people, which explains the prevalence of adult mosquitoes at times when rainfall was scant; 2. Water meters were documented for the first time as productive habitats for Ae. aegypti; 3. Even though Puerto Rico has a reliable supply of tap water and an active tire recycling program, water storage containers and discarded tires were important mosquito producers; 4. Peaks in mosquito density preceded maximum dengue incidence; and 5. Ae. aegypti dynamics were driven by weather and human activity and oviposition was significantly correlated with dengue incidence.
Author summary - Previous studies on the influence of weather on Aedes aegypti in Puerto Rico suggested that rainfall influenced mosquito populations and dengue incidence in the drier areas of the island. We studied temporal changes in Ae. aegypti in areas where rainfall is more uniformly distributed throughout the year. Changes in adult mosquitoes were monitored with BG-Sentinel traps and oviposition activity with CDC enhanced ovitraps. We also counted the number of mosquito pupae in containers with water during the drier and wetter parts of the year to determine the contribution of humans and rainfall to mosquito production. Mosquito dynamics was compared with dengue incidence in the municipalities investigated in the study (November 2007–December 2008). We found that the population of Ae. aegypti was driven by weather and human activities, and peaks in mosquito density preceded maximum dengue incidence during the rainy season. Even though Puerto Rico has a reliable supply of tap water and an active tire recycling program, water storage containers (e.g., 5-gal pails, drums) and discarded tires were important mosquito producers. We also documented for the first time that water meters are important producers ofAe. aegypti. This longitudinal study contributes to a better understanding of the complex dynamics of weather, human behavior, mosquito vectors, and dengue virus transmission in an endemic country.
Source
Barrera R, Amador M, MacKay AJ (2011) Population Dynamics of Aedes aegypti and Dengue as Influenced by Weather and Human Behavior in San Juan, Puerto Rico. PLoS Negl Trop Dis 5(12): e1378. doi:10.1371/journal.pntd.0001378
Author summary - Previous studies on the influence of weather on Aedes aegypti in Puerto Rico suggested that rainfall influenced mosquito populations and dengue incidence in the drier areas of the island. We studied temporal changes in Ae. aegypti in areas where rainfall is more uniformly distributed throughout the year. Changes in adult mosquitoes were monitored with BG-Sentinel traps and oviposition activity with CDC enhanced ovitraps. We also counted the number of mosquito pupae in containers with water during the drier and wetter parts of the year to determine the contribution of humans and rainfall to mosquito production. Mosquito dynamics was compared with dengue incidence in the municipalities investigated in the study (November 2007–December 2008). We found that the population of Ae. aegypti was driven by weather and human activities, and peaks in mosquito density preceded maximum dengue incidence during the rainy season. Even though Puerto Rico has a reliable supply of tap water and an active tire recycling program, water storage containers (e.g., 5-gal pails, drums) and discarded tires were important mosquito producers. We also documented for the first time that water meters are important producers ofAe. aegypti. This longitudinal study contributes to a better understanding of the complex dynamics of weather, human behavior, mosquito vectors, and dengue virus transmission in an endemic country.
Source
Barrera R, Amador M, MacKay AJ (2011) Population Dynamics of Aedes aegypti and Dengue as Influenced by Weather and Human Behavior in San Juan, Puerto Rico. PLoS Negl Trop Dis 5(12): e1378. doi:10.1371/journal.pntd.0001378
Impact of temperature fluctuations on dengue virus transmission by Aedes aegypti
"Abstract - The influence of temperature and r.h. on the flight performance of tethered virgin female Aedes aegypti was investigated. Mosquitoes of similar age were flown to exhaustion on flight mills at various temperatures and relative humidities. Parameters measured were distance flown, duration of flight, speed of flight, initial weight of mosquitoes, and live weight lost during exhaustive flight.The temperature range at which sustained tethered flight occurred was 15 to 32°C. Temperature extremes at which flight was possible were 10 and 35°C; however, performance was minimal in both duration and distance at these temperatures. The optimal temperature for flight was 21°C. Mosquitoes flew farther at 15°C than at the commonly reported optimal temperature of 27°C.
In general, flight performance was greater below 27°C.
Relative humidity within 30 to 90 per cent had no demonstrable influence on flight performance at any temperature studied except at 32°C where 30 per cent had a marked limiting effect on mosquito flight."
Source:
In general, flight performance was greater below 27°C.
Relative humidity within 30 to 90 per cent had no demonstrable influence on flight performance at any temperature studied except at 32°C where 30 per cent had a marked limiting effect on mosquito flight."
Source:
- ROWLEY, W.A. and GRAHAM, C.L., 1968, THE EFFECT OF TEMPERATURE AND RELATIVE HUMIDITY ON THE FLIGHT PERFORMANCE OF FEMALE AEDES AEGYPTI, J. Insect Physiol., Vol. 14, pp. 1251 to 125
Impact of daily temperature fluctuations on dengue virus transmission by Aedes aegypti
"Abstract - Most studies on the ability of insect populations to transmit pathogens consider only constant temperatures and do not account for realistic daily temperature fluctuations that can impact vector–pathogen interactions. Here, we show that diurnal temperature range (DTR) affects two important parameters underlying dengue virus (DENV) transmission by Aedes aegypti. In two independent experiments using different DENV serotypes, mosquitoes were less susceptible to virus infection and died faster under larger DTR around the same mean temperature. Large DTR (20 °C) decreased the probability of midgut infection, but not duration of the virus extrinsic incubation period (EIP), compared with moderate DTR (10 °C) or constant temperature. A thermodynamic model predicted that at mean temperatures <18 °C, DENV transmission increases as DTR increases, whereas at mean temperatures >18 °C, larger DTR reduces DENV transmission. The negative impact of DTR on Ae. aegypti survival indicates that large temperature fluctuations will reduce the probability of vector survival through EIP and expectation of infectious life. Seasonal variation in the amplitude of daily temperature fluctuations helps to explain seasonal forcing of DENV transmission at locations where average temperature does not vary seasonally and mosquito abundance is not associated with dengue incidence. Mosquitoes lived longer and were more likely to become infected under moderate temperature fluctuations, which is typical of the high DENV transmission season than under large temperature fluctuations, which is typical of the low DENV transmission season. Our findings reveal the importance of considering short-term temperature variations when studying DENV transmission dynamics."
Source:
Source:
- Lambrechts, L. et al., 2011, Impact of daily temperature fluctuations on dengue virus transmission by Aedes aegypti, PNAS, vol. 108 no. 18 7460-7465
Significant Discovery: How Natural Temperature Fluctuations Affect the Population Growth Rate of the Dengue Mosquito
Abstract
Background
The effect of temperature on insect biology is well understood under constant temperature conditions, but less so under more natural, fluctuating conditions. A fluctuating temperature profile around a mean of 26°C can alter Aedes aegypti vector competence for dengue viruses as well as numerous life-history traits, however, the effect of fluctuations on mosquitoes at critical thermal limits is unknown.
Methodology/Principal Findings
We investigated the effects of large and small daily temperature fluctuations at low (16°C) and high (35–37°C) mean temperatures, after we identified these temperatures as being thresholds for immature development and/or adult reproduction under constant temperature conditions. We found that temperature effects on larval development time, larval survival and adult reproduction depend on the combination of mean temperature and magnitude of fluctuations. Importantly, observed degree-day estimates for mosquito development under fluctuating temperature profiles depart significantly (around 10–20%) from that predicted by constant temperatures of the same mean. At low mean temperatures, fluctuations reduce the thermal energy required to reach pupation relative to constant temperature, whereas at high mean temperatures additional thermal energy is required to complete development. A stage-structured model based on these empirical data predicts that fluctuations can significantly affect the intrinsic growth rate of mosquito populations.
Conclusions/Significance
Our results indicate that by using constant temperatures, one could under- or over-estimate values for numerous life-history traits compared to more natural field conditions dependent upon the mean temperature. This complexity may in turn reduce the accuracy of population dynamics modeling and downstream applications for mosquito surveillance and disease prevention.
Source:
Background
The effect of temperature on insect biology is well understood under constant temperature conditions, but less so under more natural, fluctuating conditions. A fluctuating temperature profile around a mean of 26°C can alter Aedes aegypti vector competence for dengue viruses as well as numerous life-history traits, however, the effect of fluctuations on mosquitoes at critical thermal limits is unknown.
Methodology/Principal Findings
We investigated the effects of large and small daily temperature fluctuations at low (16°C) and high (35–37°C) mean temperatures, after we identified these temperatures as being thresholds for immature development and/or adult reproduction under constant temperature conditions. We found that temperature effects on larval development time, larval survival and adult reproduction depend on the combination of mean temperature and magnitude of fluctuations. Importantly, observed degree-day estimates for mosquito development under fluctuating temperature profiles depart significantly (around 10–20%) from that predicted by constant temperatures of the same mean. At low mean temperatures, fluctuations reduce the thermal energy required to reach pupation relative to constant temperature, whereas at high mean temperatures additional thermal energy is required to complete development. A stage-structured model based on these empirical data predicts that fluctuations can significantly affect the intrinsic growth rate of mosquito populations.
Conclusions/Significance
Our results indicate that by using constant temperatures, one could under- or over-estimate values for numerous life-history traits compared to more natural field conditions dependent upon the mean temperature. This complexity may in turn reduce the accuracy of population dynamics modeling and downstream applications for mosquito surveillance and disease prevention.
Source:
- Carrington, L.B et al., 2013 "Effects of Fluctuating Daily Temperatures at Critical Thermal Extremes on Aedes aegypti Life-History Traits", PLoS ONE 8(3): e58824. doi:10.1371/journal.pone.0058824
- Significant Discovery: How Natural Temperature Fluctuations Affect the Population Growth Rate of the Dengue Mosquito, UC Davis
