Assessing the impact of density dependence in field populations of Aedes aegypti

Walsh, Rachael K.; Facchinelli, Luca; Ramsey, Janine M.; Bond, J. Guillermo; Gould, Fred

doi:10.1111/j.1948-7134.2011.00170.x

Cited by 68 publications

(92 citation statements)

References 26 publications

(32 reference statements)

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“…Population dynamics are very sensitive to small changes in (Chaves et al 2012), which in principle makes us believe this parameter has low variability, a fact further reinforced by the similarity in estimates from populations as far apart as Puerto Rico and Thailand (Chaves et al 2012). Based on entomological observations (Bar-Zeev 1958a;Tun-Lin et al 2000;Walsh et al 2011;Wijeyaratne et al 1974;Yang et al 2009b) we assumed that high temperatures were detrimental for larvae, decreasing larval survival in the "hot" environment. We assumed larval survival under "normal" environments to be p 1 =0.500 based on field observations (Walsh et al 2011;Wijeyaratne et al 1974), an estimate that tends to be smaller than laboratory based estimations (Bar-Zeev 1958b; Barbosa et al 1972;Headlee 1940;Headlee 1941;Koenraadt et al 2010;Tun-Lin et al 2000).…”

Section: Parametersmentioning

confidence: 99%

“…Experiments and entomological observations suggest that density-dependence regulation of Aedes aegypti (Dye 1984;Gilpin & Mcclelland 1979;Legros et al 2009;Southwood et al 1972) occurs primarily during the immature stages. However, Aedes aegypti larval density does not seem to affect adult emergence success when resources are adequate (Bar-Zeev 1957;Barbosa et al 1972;Dye 1982;Wada 1965) and differences in survival are not significant when comparing low and high resource levels (Rios et al 1978;Walsh et al 2011). Nevertheless, emerging individuals are smaller and less fecund on low resources (Bar-Zeev 1957;Briegel et al 2002).…”

Section: Model Descriptionmentioning

confidence: 99%

“…Based on entomological observations (Bar-Zeev 1958a;Tun-Lin et al 2000;Walsh et al 2011;Wijeyaratne et al 1974;Yang et al 2009b) we assumed that high temperatures were detrimental for larvae, decreasing larval survival in the "hot" environment. We assumed larval survival under "normal" environments to be p 1 =0.500 based on field observations (Walsh et al 2011;Wijeyaratne et al 1974), an estimate that tends to be smaller than laboratory based estimations (Bar-Zeev 1958b; Barbosa et al 1972;Headlee 1940;Headlee 1941;Koenraadt et al 2010;Tun-Lin et al 2000). We further assumed that for "hot" environments larval survival was halved, as observed in the laboratory for Ae aegypti (Bar-Zeev 1958a;Mohammed & Chadee 2011;Rueda et al 1990;Tun-Lin et al 2000) and for other culicinae mosquitoes under field conditions (Chaves et al 2011).…”

Section: Parametersmentioning

confidence: 99%

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Hot temperatures can force delayed mosquito outbreaks via sequential changes in Aedes aegypti demographic parameters in autocorrelated environments

et al. 2014

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Aedes aegypti L. (Diptera: Culicidae) is a common pantropical urban mosquito, vector of dengue, Yellow Fever and chikungunya viruses. Studies have shown Ae. aegypti abundance to be associated with environmental fluctuations, revealing patterns such as the occurrence of delayed mosquito outbreaks, i.e., sudden extraordinary increases in mosquito abundance, following transient extreme high temperatures. Here, we use a two-stage (larvae and adults) matrix model to propose a mechanism for environmental signal canalization into demographic parameters of Ae. aegypti that could explain delayed high temperature induced mosquito outbreaks. We performed model simulations using parameters estimated from a weekly time series from Thailand, assuming either independent or autocorrelated environments. For autocorrelated environments, we found that long delays in the association between the onset of "hot" environments and mosquito outbreaks (10 weeks, as observed in Thailand) can be generated when "hot" environments sequentially trigger a larval survival decrease and over-compensatory fecundity increase, which lasts for the whole "hot" period, in conjunction with a larval survival increase followed by a fecundity decrease when the environment returns to "normal". This result was not observed for independent environments. Finally, we discuss our results implications for prospective entomological research and vector management under changing environments.

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Section: Parametersmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: Parametersmentioning

confidence: 99%

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Hot temperatures can force delayed mosquito outbreaks via sequential changes in Aedes aegypti demographic parameters in autocorrelated environments

et al. 2014

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“…The preliminary study created the high-density and low-density treatments by using a 4:1 (high:low) ratio of larvae in each divided container. 30 A broader range in the difference between treatments (i.e., 4:1) is needed to understand the population dynamics and parameterize mathematical models.…”

Section: Introductionmentioning

confidence: 99%

“…aegypti and dengue occur. 30 The study used containers found at peoples' houses that were infested with Ae. aegypti larvae.…”

Section: Introductionmentioning

confidence: 99%

Regulation of Aedes aegypti Population Dynamics in Field Systems: Quantifying Direct and Delayed Density Dependence

Walsh¹,

Aguilar²,

Facchinelli³

et al. 2013

The American Journal of Tropical Medicine and Hygiene

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Abstract. Transgenic strains of Aedes aegypti have been engineered to help control transmission of dengue virus. Although resources have been invested in developing the strains, we lack data on the ecology of mosquitoes that could impact the success of this approach. Although studies of intra-specific competition have been conducted using Ae. aegypti larvae, none of these studies examine mixed age cohorts at densities that occur in the field, with natural nutrient levels. Experiments were conducted in Mexico to determine the impact of direct and delayed density dependence on Ae. aegypti populations. Natural water, food, and larval densities were used to estimate the impacts of density dependence on larval survival, development, and adult body size. Direct and delayed density-dependent factors had a significant impact on larval survival, larval development, and adult body size. These results indicate that control methods attempting to reduce mosquito populations may be counteracted by density-dependent population regulation.

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(Meta)population dynamics determine effective spatial distributions of mosquito‐borne disease control

Schwab

Stone

Fonseca

et al. 2019

Ecological Applications

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Recent epidemics of mosquito‐borne dengue and Zika viruses demonstrate the urgent need for effective measures to control these diseases. The best method currently available to prevent or reduce the size of outbreaks is to reduce the abundance of their mosquito vectors, but there is little consensus on which mechanisms of control are most effective, or when and where they should be implemented. Although the optimal methods are likely context dependent, broadly applicable strategies for mosquito control, such as how to distribute limited resources across a landscape in times of high epidemic risk, can mitigate (re)emerging outbreaks. We used mathematical simulations to examine how the spatial distribution of larval mosquito control affects the size of disease outbreaks, and how mosquito metapopulation dynamics and demography might impact the efficacy of different spatial distributions of control. We found that the birth rate and mechanism of density‐dependent regulation of mosquito populations affected the average outbreak size across all control distributions. These factors also determined whether control distributions favoring the interior or the edges of the landscape most effectively reduced human infections. Thus, understanding local mosquito population regulation and dispersion can lead to more effective control strategies.

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Assessing the impact of density dependence in field populations of Aedes aegypti

Cited by 68 publications

References 26 publications

Hot temperatures can force delayed mosquito outbreaks via sequential changes in Aedes aegypti demographic parameters in autocorrelated environments

Hot temperatures can force delayed mosquito outbreaks via sequential changes in Aedes aegypti demographic parameters in autocorrelated environments

Regulation of Aedes aegypti Population Dynamics in Field Systems: Quantifying Direct and Delayed Density Dependence

(Meta)population dynamics determine effective spatial distributions of mosquito‐borne disease control

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