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Host food quality and quantity differentially affect Ascogregarina barretti parasite burden, development and within-host competition in the mosquito Aedes triseriatus

Published online by Cambridge University Press:  29 August 2019

Katie M. Westby Open the ORCID record for Katie M. Westby [Opens in a new window] ,
Brenden M. Sweetman ,
Solny A. Adalsteinsson ,
Elizabeth G. Biro  and
Kim A. Medley
Katie M. Westby*
Affiliation:
Tyson Research Center, Washington University in St Louis, 6750 Tyson Valley Road, Eureka, MO 63025, USA
Brenden M. Sweetman
Affiliation:
Tyson Research Center, Washington University in St Louis, 6750 Tyson Valley Road, Eureka, MO 63025, USA
Solny A. Adalsteinsson
Affiliation:
Tyson Research Center, Washington University in St Louis, 6750 Tyson Valley Road, Eureka, MO 63025, USA
Elizabeth G. Biro
Affiliation:
Tyson Research Center, Washington University in St Louis, 6750 Tyson Valley Road, Eureka, MO 63025, USA
Kim A. Medley
Affiliation:
Tyson Research Center, Washington University in St Louis, 6750 Tyson Valley Road, Eureka, MO 63025, USA
*
Author for correspondence: Katie M. Westby, E-mail: [email protected]
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Abstract

Host condition depends in large part on the quality and quantity of available food and heavily influences the outcome of parasite infection. Although parasite fitness traits such as growth rate and size may depend on host condition, whether host food quality or quantity is more important to parasite fitness and within-host interactions is poorly understood. We provided individual mosquito hosts with a standard dose of a gregarine parasite and reared mosquitoes on two food types of different quality and two quantities. We measured host size, total parasite count and area, and average size of parasites within each treatment. Food quality significantly influenced the number of parasites in a host; hosts fed a low-quality diet were infected with more parasites than those provided a high-quality diet. In addition, we found evidence of within-host competition; there was a negative relationship between parasite size and count though this relationship was dependent on host food quality. Host food quantity significantly affected total parasite area and parasite size; lower food quantity resulted in smaller parasites and reduced overall parasite area inside the host. Thus both food quality and quantity have the potential to influence parasite fitness and population dynamics.

Keywords

Aedes triseriatusAscogregarina barrettidetritusgregarineshost conditionmosquitotanninswith-in host competition
Type
Research Article
Information
Parasitology , Volume 146 , Issue 13 , November 2019 , pp. 1665 - 1672
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Copyright
Copyright © Cambridge University Press 2019 

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