Allometric and non-allometric consequences of inbreeding on Drosophila melanogaster wings

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  • Vincenzo Trotta, Università di Bologna, Italien
  • Sandro Cavicchi, Università di Bologna, Italien
  • Daniela Guerra, Università di Bologna, Italien
  • Ditte Holm Andersen
  • Gregory A Babbitt, Center for Evolutionary Functional Genomics, The Biodesign Institute and School of Life Sciences, USA
  • Torsten Nygård Kristensen, Danmark
  • Kamilla Sofie Pedersen, Danmark
  • Volker Loeschcke
  • C. Pertoldi
Inbreeding is expected to increase the variability in size and shape within populations. The distinct effects of inbreeding on size and shape suggest that they are governed by different developmental pathways. One unresolved question is whether the non-allometric shape component is partially unconstrained developmentally and therefore whether shape is evolvable. In the present study, we utilized a mass outbred population of Drosophila melanogaster maintained at standard laboratory conditions. Eight lines with equivalent expected levels of inbreeding (F ≈ 0.67) were obtained by restricting the size of each population to two pairs for nine generations. Nine landmarks were measured on Drosophila wings of the inbreed lines and compared with those of the mass population. Wing landmarks comprise an excellent model system for studying evolution of size and shape. Landmark measurements were analyzed with a Procrustes generalized least squares procedure. To visualize global shape changes among samples, we reconstructed the mean shape and the shape changes related to both the allometric and non-allometric components. An increased variability in the non-allometric shape component was found with inbreeding. This indicated that shape was not entirely developmentally constrained, and therefore that shape appears to be evolvable
TidsskriftBiological Journal of the Linnean Society
Sider (fra-til)626-634
Antal sider9
StatusUdgivet - mar. 2011

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