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Impacts of biotic and abiotic parameters on immature populations of Aedes aegypti

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Abstract

In recent centuries, the mosquito Aedes aegypti has spread into most urban areas throughout the tropics. This species is considered the main vector of the chikungunya, dengue, yellow fever and Zika viruses and causes major public health issues. The aim of this study is to investigate the relative influence of biotic and abiotic parameters on immature populations of Ae. aegypti. During a one-year-long field experiment, we monitored 108 macroinvertebrate aquatic communities inhabiting four types of water containers across three different urbanized sites in a Neotropical city. A multimodel inference approach revealed that, in addition to abiotic parameters, biotic interactions with aquatic organisms had an important influence on the abundance of Ae. aegypti and that the urbanized site considered influences the outcomes of the interactions. Controphic species other than mosquitoes aided Ae. aegypti development, suggesting a mechanism of facilitation through a chain of processes. However, the abundance of Ae. aegypti was lowered by competition with native mosquito species in the slightly urbanized area and by predation in more urbanized areas. Competitive displacement and reduction, as well as predation by native aquatic organisms, can be considered a form of ecosystem service. The conservation and/or augmentation of natural enemies should improve the short- and long-term success of incompatible and/or sterile insect techniques, thus opening up perspectives for the future of mosquito management.

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Acknowledgments

We are grateful to Andrea Yockey for proofreading the manuscript and to the municipality of Kourou (through the Service Départemental de Désinfection) for permitting us to work inside the city limits. We would also like to thank the Ringuet family and the French Centre de Coopération Internationale en Recherche Agronomique pour le Développement for allowing us to set up experimental sites on their properties. This study received financial support from an ‘Investissement d’Avenir’ grant managed by the French National Research Agency (CEBA, ref. ANR-10-LABX-25–01).

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Correspondence to Stanislas Talaga.

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The authors have declared that no conflict of interest exists.

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Informed consent was obtained from all individual participants included in the study.

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This article does not include studies with human participants or animals (vertebrates) conducted by any of the authors.

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Communicated by M. Traugott.

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Talaga, S., Dejean, A., Azémar, F. et al. Impacts of biotic and abiotic parameters on immature populations of Aedes aegypti. J Pest Sci 93, 941–952 (2020). https://doi.org/10.1007/s10340-020-01214-w

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  • DOI: https://doi.org/10.1007/s10340-020-01214-w

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