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A laboratory study on the effect of Paraiotonchium autumnale parasitism on the longevity of Musca autumnalis

Published online by Cambridge University Press:  31 July 2012

HANAYO ARIMOTO ,
HARRY K. KAYA  and
EDWIN E. LEWIS
HANAYO ARIMOTO*
Affiliation:
University of California, Davis, Department of Entomology, One Shields Avenue, Davis, California, USA
HARRY K. KAYA
Affiliation:
University of California, Davis, Department of Entomology, One Shields Avenue, Davis, California, USA
EDWIN E. LEWIS
Affiliation:
University of California, Davis, Department of Entomology, One Shields Avenue, Davis, California, USA
*
*Corresponding author: Tel:+530 752 2592. Fax: +415 564 1392. E-mail: harimoto@ucdavis.edu
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Summary

Paraiotonchium autumnale (Nickle) (Tylenchida: Iotonchiidae) causes parasitic sterilization in female Musca autumnalis DeGeer (Diptera: Muscidae). In addition to sterilization, P. autumnale causes physiological and behavioural changes within its host. However, there have been no records of reduced host lifespan in this system. Studies were conducted in 2009 and 2010 with wild M. autumnalis collected as larvae from cow dung pats from Browns Valley, California, USA. Field-collected larvae were reared to adulthood and flies of the same eclosion dates were caged together, regardless of whether or not they were parasitized. Dead flies were collected daily, and parasitism status was confirmed by dissection. Due to the very different effects of P. autumnale-parasitism on male versus female face flies, flies were analysed separately by sex. Kaplan-Meier analysis revealed a non-significant difference in longevity between non-parasitized and parasitized flies for female and male flies in 2009. In 2010, however, significant differences (P < 0·05) were found between parasitized and non-parasitized female and male flies. In 2010, the median time to death for non-parasitized female flies was 20 days and 15 days for parasitized females. The 2010 median survival time for non-parasitized male flies was 33 days and 15 days for parasitized males. This is a parasite-mediated cost to the host that has not been recorded previously. Based on our results and results from another published study we suggest that the potential for sterilizing parasites to alter host longevity is condition dependent.

Keywords

Musca autumnalisParaiotonchium autumnaleparasitic sterilizationhost longevity
Type
Research Article
Information
Parasitology , Volume 139 , Issue 12 , October 2012 , pp. 1580 - 1586
Copyright
Copyright © Cambridge University Press 2012

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