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Publication type: Diploma Thesis

Year: 2010

Author(s): Brodesser, Daniela Marie

Title: Ein Beitrag zur Dynamik von Moskitos, den Überträgern des West Nil Virus.

Other title: Contributions to the Dynamics of Mosquitoes ¿ the Vector of West Nile Virus

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 53.

Authors Vetmeduni Vienna:

Brodesser Daniela

Rubel Franz

Fuchs Klemens
Rubel Franz

Vetmed Research Units:
Institute of Food Safety, Food Technology and Veterinary Public Health, Unit of Veterinary Public Health and Epidemiology

Two different models to simulate the abundance of mosquito populations are described in this thesis. These models are just one aspect of epidemic model to forecast the risk of West Nile Virus infections, as developed in the scientifical community these days. The first West Nile Virus outbreak in the United States in 1999 and the recurrent Outbreaks in Central Europe mark the actuality of this topic. The first model is a very simplified one and describes the growth of the mosquito population with steady parameters (birth- and mortality rates), as suggested by American colleagues. It just can be used in the tropics or for short periods of time. The second, extended model is working with parameters, which are defined as functions of ecological parameters, namely ambient air temperature and photoperiod; they are given externally and drive the model. They are indispensable for reproduction of the saisonal cycle and the diapause of the mosquitoes. Both population models calculate the abundance of Larvae and adult mosquitoes, whereas all aquatic stages (Eggs, Larvae, Puppae) are summarized in the term Larvae. For simulations over several years the extended model was used. The result contains time series of the abundance of mosquitoes calculated for the locations Vienna, Los Angeles (Bakersfield) and New York City (Central Park) for the period 2001-2005. A first visual comparison of monitoring data of West Nile Virus-infected mosquitoes for the entire area of New York State showed that the simulation of the mosquito-population with the extended model produced results close to reality. In a final experiment alternative parameters were used for birth- and mortality rates of the mosquitoes as suggested by the literature. Not all of them are applicable in the mosquito model. Thus, as a further result of this thesis, a table for the practicability of these different models is shown.

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