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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) Edvardsson, M.; Rodríguez-Muñoz, R.; Tregenza, T. file  url
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  Title No evidence that female bruchid beetles, Callosobruchus maculatus, use remating to reduce costs of inbreeding Type Journal Article
  Year 2008 Publication Animal Behaviour Abbreviated Journal Animal Behaviour  
  Volume 75 Issue 4 Pages 1519-1524  
  Keywords bruchid beetle; Callosobruchus maculatus; inbreeding avoidance; inbreeding depression; mate choice  
  Abstract Despite the often dramatic negative effects of inbreeding on offspring fitness, matings between closely related individuals sometimes occur. This may be because females cannot reliably recognize related males before mating with them. As an alternative to precopulatory choice, polyandrous females may avoid inbreeding through postcopulatory mechanisms if they can assess mate relatedness during or after copulation. These mechanisms include increasing remating propensity and decreasing rate of offspring production in response to incestuous matings. Stored product pests, such as the bruchid beetle Callosobruchus maculatus, have an ecology that is likely to expose them to frequent risks of inbreeding when a small number of females found a new population on a previously uninfested store of beans. Using this species, we show that inbreeding has negative effects on offspring viability but that females do not appear to discriminate between brothers and unrelated males prior to mating. Furthermore, females that first mated with brothers did not increase their remating propensity or decrease their rate of offspring production relative to females that first mated with unrelated males. Our findings suggest that the costs of inbreeding have not been sufficient to drive the evolution of mating behaviour as a mechanism of inbreeding avoidance in C. maculatus.  
  Call Number Serial 1625  
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Author (up) Murdock, L.L.; Margam, V.; Baoua, I.; Balfe, S.; Shade, R.E. file  url
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  Title Death by desiccation: Effects of hermetic storage on cowpea bruchids Type Journal Article
  Year 2012 Publication Journal of Stored Products Research Abbreviated Journal Journal of Stored Products Research  
  Volume 49 Issue Pages 166-170  
  Keywords Cowpea bruchid; Hermetic storage; Mode of action; Postharvest; Water supply; Callosobruchus maculatus; Beetle  
  Abstract When cowpea grain is stored in airtight containers, destructive populations of the cowpea bruchid (Callosobruchus maculatus) don�t develop even though the grain put into the store is already infested with sufficient C. maculatus to destroy the entire store within a few months. The surprising effectiveness of hermetic storage for preserving grain against insect pests has long been linked with the depletion of oxygen in the hermetic container and with the parallel rise in carbon dioxide. With C. maculatus, low oxygen (hypoxia) leads to cessation of larval feeding activity, whereas elevated levels of carbon dioxide (hypercarbia) have little or no effect on feeding. Cessation of feeding arrests the growth of the insects, which don�t mature and don�t reproduce. As a result, population growth ceases and damaging infestations don�t develop. C. maculatus eggs, larvae, and pupae subjected to hypoxia eventually die after exposures of various duration. The cause of death is desiccation resulting from an inadequate supply of water. We demonstrate that blocking the supply of oxygen interdicts the main supply of water for C. maculatus. This leads to inactivity, cessation of population growth, desiccation and eventual death.  
  Call Number Serial 1693  
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