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Effects of host species, stage and size on the sex ratio and clutch size of the parasitoid, Dibrachys boarmiae (Walker, 1863) (Hymenoptera: Pteromalidae)

Published online by Cambridge University Press:  06 January 2011

A. Sarikaya  and
A. Gülel
A. Sarikaya*
Affiliation:
Amasya University, Faculty of Arts and Science, Department of Biology, Amasya, Turkey
A. Gülel
Affiliation:
Ondokuz Mayis University, Faculty of Arts and Science, Department of Biology, Samsun, Turkey
*
*Author for correspondence Fax: +90 358 2421616 E-mail: adnansarikaya@hotmail.com
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Abstract

Effects of host species, stage and size on clutch size and sex ratio of the gregarious, idiobiont ectoparasitoid Dibrachys boarmiae were investigated at 25±2°C and 70±5% relative humidity. The greater wax moth, Galleria mellonella, small wax moth, Achroia grisella, and early stage solitary larvae of the endoparasitoid, Apanteles galleriae, were used as hosts. Clutch size was greatest from prepupae of the largest host, Galleria mellonella, with a mean of 40.07 offspring per host versus 14.73 and 2.93 for Achroia grisella and Apanteles galleriae, respectively. The mean clutch size from pupae was lower than from prepupae, being 17.27, 10.73 and 2.89 for Galleria mellonella, Achroia grisella and Apanteles galleriae, respectively. Within each host species and stage, heavier hosts resulted in larger clutches. The sex ratio of offspring (proportion of male) was approximately 0.20, with only minor differences among host species, stages and sizes.

Keywords

parasitoidDibrachys boarmiaehost specieshost sizehost stagesex ratioclutch size
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 101 , Issue 3 , June 2011 , pp. 325 - 331
Copyright
Copyright © Cambridge University Press 2011

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