| Autor: |
Burns-Dunn S; School of Science, Western Sydney University, Hawkesbury Campus, Richmond, NSW 2753, Australia., Mortys T; School of Science, Western Sydney University, Hawkesbury Campus, Richmond, NSW 2753, Australia., House CM; School of Science, Western Sydney University, Hawkesbury Campus, Richmond, NSW 2753, Australia., Mitchell C; Centre for Ecology & Conservation, School of Biosciences, University of Exeter, Cornwall Campus, Penryn TR10 9EZ, UK., Duffield KR; Crop BioProtection Research Unit, Agricultural Research Services, United States Department of Agriculture, National Centre for Agricultural Utilization Research, Peoria, IL, USA., Foquet B; School of Biological Sciences, Illinois State University, Normal, IL 61790-4120, USA., Sadd BM; School of Biological Sciences, Illinois State University, Normal, IL 61790-4120, USA., Sakaluk SK; School of Biological Sciences, Illinois State University, Normal, IL 61790-4120, USA., Hunt J; School of Science, Western Sydney University, Hawkesbury Campus, Richmond, NSW 2753, Australia. |
| Abstrakt: |
The evolution of nuptial gifts has traditionally been considered a harmonious affair, providing benefits to both mating partners. There is growing evidence, however, that receiving a nuptial gift can be actively detrimental to the female. In decorated crickets ( Gryllodes sigillatus ), males produce a gelatinous spermatophylax that enhances sperm transfer but provides little nutritional benefit and hinders female post-copulatory mate choice. Here, we examine the sexually antagonistic coevolution of the spermatophylax and the female feeding response to this gift in G. sigillatus maintained in experimental populations with either a male-biased or female-biased adult sex ratio. After 25 generations, males evolving in male-biased populations produced heavier spermatophylaxes with a more manipulative combination of free amino acids than those evolving in female-biased populations. Moreover, when the spermatophylax originated from the same selection regime, females evolving in male-biased populations always had shorter feeding durations than those evolving in female-biased populations, indicating the evolution of greater resistance. Across populations, female feeding duration increased with the mass and manipulative combination of free amino acids in the spermatophylax, suggesting sexually antagonistic coevolution. Collectively, our work demonstrates a key role for interlocus sexual conflict and sexually antagonistic coevolution in the mating system of G. sigillatus . |
