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http://dx.doi.org/10.5141/JEFB.2007.30.3.277

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

Kim, Kil-Won (Division of Ecoscience, Ewha Womans University)
Choe, Jae-Chun (Division of Ecoscience, Ewha Womans University)
Publication Information
Journal of Ecology and Environment / v.30, no.3, 2007 , pp. 277-280 More about this Journal
Abstract
Social spiders consistently show highly female-biased sex ratios. However, the sex ratio of subsocial spiders, which have been suggested as an intermediate stage of the evolutionary pathway towards permanent sociality, is generally unknown. We investigated the sex ratio and approximate date of fertilization of the subsocial spider, Amaurobius ferox Walckenaer (Araneae: Amaurobiidae). Investigation over 2 years revealed that sex ratio of A. ferox was consistent across years and averaged 0.49. By early May $(1^{st}{\sim}10^{th})$, 66.6% of female A. ferox observed in the field had already been inseminated, and by late May $(21^{st}{\sim}31^{th})$, 95.4% of females had been inseminated. This result suggests that A. ferox need a long time or cold temperatures to prepare them for reproduction after the developmental attainment of the adult stage.
Keywords
Amaurobius; Insemination; Sex ratio; Subsocial spider;
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