Dr. Leisnham went on to describe that many of the diseases vectored by mosquitoes have no vaccine, making the presence of adults a greater health risk. For this reason, effective management happens by targeting the aquatic larvae, rather than the terrestrial adults. Mosquito larvae utilize a number of different habitats, ranging from ponds and wetlands to birdbaths and discarded tires filled with water. Dr. Leisnham argues that these small containers may actually be one of the most important sources of mosquitoes found in urban and suburban areas.
That left him with important questions about the attitudes and knowledge of Washington D.C. residents towards mosquitoes and their management in urban settings. Working with former master’s student Zara Dowling, Dr. Leisnham designed a survey to address the following questions: 1) Can residents reduce mosquito populations? 2) Is mosquito reduction related to the attitude of the residents? and 3) Do the residents’ level of knowledge change their attitude toward reduction?
A survey of 240 households in the D.C. area was conducted by Dr. Leisnham’s lab to address these questions. The results showed that younger, higher income residents had the most general knowledge about mosquitoes, while older, male residents knew the most about mosquitoes’ larval habitat. By comparison, lower income women were the most motivated to control mosquito populations. The data also indicated that, although resident source reduction may be important, the efforts of knowledgeable residents may be rendered ineffective by residents who are not removing container habitats from their property.
Based on these results, Dr. Leisnham then designed the Tip N Trash Program, with the goal of evaluating the success of passive educational materials for effecting resident source reduction. With the help of students, Dr. Leisnham designed and circulated educational materials, including magnets and flyers, to the same 240 households used in the survey the year before.
Since beginning this line of inquiry, Dr. Leisnham has become increasingly interested in the sociological implications of his research. He plans to continue his investigation into the role of residents in mosquito management and the effectiveness of different educational tools for engaging citizen participation. He also wants to further understand the macro- and micro-scale patterns of larval mosquito occurrence that may explain overall trends in population abundance. Dr. Leisnham’s research has important implications for human health and for understanding population dynamics of invasive species; you can keep track of his research to learn more!
1. Dowling, Z.*, P. Armbruster, S. LaDeau, and P.T Leisnham. 2013. Socioeconomic status affects mosquito (Diptera: Culicidae) larval habitat with implications for vector control. Journal of Medical Entomology. In Press.
2. Smith, C. D.*, A. H. Baldwin, J. Sullivan, and P. T. Leisnham. 2013. Effects of elevated atmospheric CO2 on competition between the mosquitoes Aedes albopictus and Ae. triseriatus through changes in litter quality and production. Journal of Medical Entomology 50: 521-532; DOI: http://dx.doi.org/10.1603/ME12149.
Elanor Spadafora is a fourth year PhD student studying the influence of vegetation on predaceous diving beetle communities (Coleoptera: Dytiscidae) in restored and historic wetlands on the Delmarva Peninsula. She uses functional traits and behavioral studies to understand how these beetles interact with aquatic macrophytes and how this may influence trophic structure.