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Sex Ratio and Approximate Date of Fertilization of the Subsocial Spider Amaurobius ferox Walckenaer (Araneae: Amaurobiidae)

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2007, v.30 no.3, pp.277-280


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Abstract

Social spiders consistently show highly female-biased sex ratios. However, the sex ratio fsubsocial spiders, which ave ben sugested as an intermed iate stage of the volutionary pathway towardspermanent sociality, is generaly unknown. We investigated the sex ratio and aproximate date of ertilizationof the subsocial spider, Amaurobius ferox Walckenaer (Araneae: Amaurobidae). Investigation over 2yearsrevealed that sex ratio f A. ferox was consistent acros years and averaged 0.49. By early May (1st 10th ),6.6% of emale A. ferox observed in the field had already ben inseminated, and by la te May (21st 31st),95.4% of emales had ben inseminated. This result sugests that A. ferox ned a long time or coldtemperatures to prepare them for eproduction after the developmental atainment of the adult stage.

keywords
Amaurobius, Insemination, Sex ratio, Subsocial spider.Kim, Kil Won and Jae Chun Choe J. Ecol. Field Biol. 30 (3) 278were inseminated. As the majority of emales begin to elaboratetheir cocons from the nd of June, we investigated the proportionof emale, Amaurobius, Insemination, Sex ratio, Subsocial spider.Kim, Kil Won and Jae Chun Choe J. Ecol. Field Biol. 30 (3) 278were inseminated. As the majority of emales begin to elaboratetheir cocons from the nd of June, we investigated the proportionof emale

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(2007) Received August 8 Accepted August 27,

Journal of Ecology and Environment