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    • Keywords


      Egglaying behaviour ; oviposition preference ; specificity ; urea ; population differenttiation ; host specialization ;

    • Abstract


      Oviposition preference for ureasupplemented food was assayed by simultaneous choice trials on five pairs of closely related laboratory populations ofDrosophila melanogaster.Each pair of populations had been derived from a separate ancestral population about 85 generations prior to this study. One population in each pair had been subjected to selection for larval tolerance to the toxic effects of urea; the other population served as a control. Considerable variation in oviposition preference was seen both within and among populations, with four of the ten populations showing a significant mean preference for ureasupplemented food. The degree of specificity shown by individual females was surprisingly high, leading to a bimodal distribution of oviposition preference in some populations. Overall, selection for larval tolerance to urea did not significantly affect oviposition preference. However, the data indicated that pairwise comparisons between randomly selected populations from the two larval selection regimes would lead to a range of possible outcomes, suggesting, in several cases, that selection for larval urea tolerance had led to significant differentiation of adult oviposition preference for urea in one or the other direction. The results, therefore, highlight the importance of population level replication and caution against the practice, common in ecological studies, of assaying oviposition preference in two populations that utilize different hosts in nature, and then drawing broad evolutionary inferences from the results.

    • Author Affiliations


      Amitabh Joshi1 2 Wendy A Oshiro1 Jason Shiotsugu1 Laurence D Mueller1

      1. Department of Ecology and Evolutionary Biology, University of California, Irvine, CA - 92717, USA
      2. Evolution and Behaviour Laboratory, Animal Behaviour Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore - 560 064, India
    • Dates

  • Journal of Biosciences | News

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      Posted on July 25, 2019

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