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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 30, No. 5, 2009, pp. 559-564
Bioline Code: zr09086
Full paper language: Chinese
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 30, No. 5, 2009, pp. 559-564

 en Ovipositing Pattern of the Fig Wasps and Its Effect on the Offspring Sex Ratio
Sun, Bao-fa; Wang, Rui-wu & Hu, Zhong

Abstract

In this study, we experimentally examined the ovipositing sequence of the pollinator Ceratosolen fuscicep check for this species in other resources , non-pollinating wasp Platyneura mayri check for this species in other resources of Ficus racemosa check for this species in other resources and non-pollinating wasp Acophila check for this species in other resources sp.1 and Wakerella benjamini check for this species in other resources of Ficus benjamina check for this species in other resources in Xishuangbanna from Apr. 2006 to Jun. 2007. For the pollinating fig wasps, we injected ether into the receptive fruits with different time intervals after introducing the fig wasps, killing the fig wasps; for the non-pollinating fig wasps, we manually controlled ovipositing time length through organdy bags. After the treated fruits developed to be mature stage, we collected the adult wasps, and then analyzed and compared the offspring sex ratio under different ovipositing time length. The data showed that fig wasp C. fuscicep, P. mayri and Acophila sp.1 firstly oviposit their male offspring. The male offspring was much higher than female, if the mother wasps only oviposited one hour, whist the female offspring will be increased with the increase of oviposting time of mother wasps and the female offspring will be much higher than male offspring when the mother wasps could sufficiently oviposit their offspring in these three fig wasps. These results partly explain that the female offspring sex ratio decrease with increase of number of foundresses. However, the ovipositing sequence of Wakerella benjamini randomly oviposit their eggs and the sex ratio is about 1:1. Our results here imply that the ovipositing sequence and ovipositing time length of mother wasps might be of the most important factors determining the offspring sex ratio of fig wasps.

Keywords
Fig wasp; Sex ratio; Oviposition sequence; Local mate competition; Female biased sex ratio

 
© Copyright 2009 Kunming Institute of Zoology, the Chinese Academy of Sciences
Alternative site location: http://www.zoores.ac.cn/

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