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Author (up) den Hollander, M.; Gwynne, D.T. file  url
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  Title Female fitness consequences of male harassment and copulation in seed beetles, Callosobruchus maculatus Type Journal Article
  Year 2009 Publication Animal Behaviour Abbreviated Journal Animal Behaviour  
  Volume 78 Issue 5 Pages 1061-1070  
  Keywords Bruchid; Callosobruchus maculatus; Fitness; Nuptial gift; Polyandry; Seed beetle; Sexual harassment  
  Abstract Despite widespread evidence for the benefits of polyandry, there are costs associated with each mating for females, and for many species, it is unknown whether the costs of extra matings outweigh the benefits. In the seed beetle Callosobruchus maculatus (Coleoptera: Chrysomelidae: Bruchinae), costs might come from male harassment during mating attempts or from injuries that females sustain during copulation. Benefits of mating might come from nutrients or water transferred in the ejaculate. If mating is costly overall, male presence (sexual harassment) and multiple mating in C. maculatus is expected to reduce female fitness. Females were housed with differing numbers of males (1�4) and differing opportunities for copulation. When females were both harassed by and could remate with more than one male, they had lower lifetime reproductive rates and reduced life span relative to monandrous females. These results indicate that when females are continually exposed to multiple males, the direct benefits of multiple mating do not compensate for the costs.  
  Call Number Serial 1696  
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Author (up) Sakurai, G.; Kasuya, E. file  url
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  Title The costs of harassment in the adzuki bean beetle Type Journal Article
  Year 2008 Publication Animal Behaviour Abbreviated Journal Animal Behaviour  
  Volume 75 Issue 4 Pages 1367-1373  
  Keywords Additional mating; Adzuki bean beetle; Callosobruchus chinensis; Coleoptera; Convenience polyandry; Courtship; Harassment; Multiple mating; Polyandry; Sexual conflict  
  Abstract Male harassment of females can be one form of premating sexual conflict, which can impose fitness cost on females. We measured the cost of male harassment on female fitness in the adzuki bean beetle, Callosobruchus chinensis, by using impotent males whose aedeaguses were ablated. These males harassed females but could not copulate with them. We measured the fitness of the females that received neither harassment nor additional copulations (cl females) and those that cohabited with ablated males (can harass but cannot copulate) (ab females). The fitness of the ab females was 18.6% lower than that of the cl females, indicating that the females incur a large fitness cost of the male harassment. Additionally, to examine whether females can avoid the fitness cost of harassment by accepting copulation (convenience polyandry), we compared the rate at which the females were harassed and the fitness of the females that cohabited with normal males (can harass and copulate) (nl females) with those of the ab females. The harassment rate and fitness of the nl females did not differ significantly from those of the ab females. These results did not positively support the convenience polyandry hypothesis.  
  Call Number Serial 1697  
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