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Does silk mediate chemical communication between the sexes in a nuptial feeding spider?

  • Michelle Beyer
  • Tomer Joseph Czaczkes
  • Cristina Tuni
Original Article

Abstract

Chemical signals play a crucial role in reproduction as a means for locating mates and/or gaining information about their quality, ultimately affecting mating system dynamics and mate choice. In spiders, one of the potential sources of chemical signalling is silk. However, while female silk is known to attract mates and/or elicit courtship, due to sex-specific roles in mate searching, male silk-related signals are often neglected. In the hunting spider Pisaura mirabilis (Pisauridae), both sexes leave silk draglines during movements while males additionally use silk to wrap nuptial gifts (food donations to females at mating). We explored the potential for both silk types (draglines and gift silk) to release signals and tested the hypothesis that chemical compounds bound to gifts’ silk serve to elicit female attraction. We conducted behavioural choice assays for dragline and gift silk, and their putative transmission mode (airborne or contact) by testing (i) male and female attraction towards draglines of the opposite sex and (ii) female attraction towards gift silk. Whereas males were attracted to female draglines (contact cues), females did not respond to male silk of any type. We suggest that females use draglines for advertisement to secure copulation and foraging of nuptial gifts. If these signals ease male mate searching, attractive male draglines are unnecessary. Overall, males may not invest in chemical stimulation but rather exploit female foraging interests through gift giving. Alternatively, they may release signals that prime other female sexual behaviours or towards which females may have evolved resistance.

Significance statement

Animals commonly use chemical signals to communicate during reproduction, and spiders have the potential to release such signals from their silk. We investigated whether two silk types, draglines released during movements and silk covering male nuptial gifts (prey offered to females at mating) are attractive to the opposite sex in a hunting spider. While males were attracted to female draglines, females did not respond to male silk of any type. Females may be using silk to advertise themselves to secure matings and food through reception of nuptial gifts. If males can successfully locate females, attracting females through draglines may be unnecessary. The finding that males do not release attractant signals in the silk cover of their nuptial gifts further suggests that rather than attempting to increase their attractiveness by using chemical stimulation, males may be uniquely exploiting females’ interest in food through gift giving behaviour.

Keywords

Silk Sexual selection Chemical signals Nuptial gifts 

Notes

Acknowledgements

We thank Patricia Velado Lobato for assistance in data collection and Federico Cappa for constructive contribution to the experimental design and comments on the manuscript.

Author contribution

CT conceived the study, MB and TC designed the experiments, MB collected the data, TC analysed the data and CT led the writing of the manuscript with all authors contributing relevantly to the draft and giving final approval for publication.

Supplementary material

265_2018_2454_MOESM1_ESM.xlsx (28 kb)
ESM 1 (XLSX 28 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of BiologyLudwig Maximilians University of MunichPlanegg-MartinsriedGermany
  2. 2.Institute of ZoologyUniversität RegensburgRegensburgGermany

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