A Comparison of Inbreeding Depression in Tropical and Widespread Drosophila Species |
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| Authors: | Jesper S Bechsgaard Ary A Hoffmann Carla Sgró Volker Loeschcke Trine Bilde Torsten N Kristensen |
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| Institution: | 1. Department of Bioscience, Aarhus University, Aarhus, Denmark.; 2. Department of Genetics and Bio21 Institute, Melbourne University, Melbourne, Australia.; 3. School of Biological Sciences, Monash University, Melbourne, Australia.; 4. Department of Molecular Biology and Genetics, Aarhus University, Tjele, Denmark.; 5. NordGen - Nordic Genetic Resource Center, Ås, Norway.; Ludwig-Maximilians-Universität München, Germany, |
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| Abstract: | The evolutionary history of widespread and specialized species is likely to cause a different genetic architecture of key ecological traits in the two species groups. This may affect how these two groups respond to inbreeding. Here we investigate inbreeding effects in traits related to performance in 5 widespread and 5 tropical restricted species of Drosophila with the aim of testing whether the two species groups suffered differently from inbreeding depression. The traits investigated were egg-to-adult viability, developmental time and resistance to heat, cold and desiccation. Our results showed that levels of inbreeding depression were species and trait specific and did not differ between the species groups for stress resistance traits. However, for the life history traits developmental time and egg-to adult viability, more inbreeding depression was observed in the tropical species. The results reported suggest that for life history traits tropical species of Drosophila will suffer more from inbreeding depression than widespread species in case of increases in the rate of inbreeding e.g. due to declines in population sizes. |
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