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The evolutionary history of Drosophila buzzatii XXVII |
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| Authors: | Esteban Hasson Juan J Fanara Constantina Rodriguez Juan C Vilardi Osvaldo A Reig Antonio Fontdevila |
| Institution: | (1) GIBE, Departmento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pab. II., 1428 Buenos Aires, Argentina;(2) Department de Genetica i de Microbiologia, Universitat Autonoma de Barcelona, 08193 Bellaterra, Spain;(3) Present address: Department of Ecology & Evolution, State University of New York, 11794-5245 Stony Brook, NY, USA |
| Abstract: | The correlation between body size and longevity was tested in an Argentinian natural population of Drosophila buzzatii. Mean thorax length of flies newly emerging from rotting cladodes of Opuntia vulgaris was significantly smaller than that of two samples of flies caught at baits. The present results which might be interpreted as directional selection for longevity favoring larger flies are in agreement with previous results achieved in a Spanish natural population of D. buzzatii. Flies emerging from different substrates showed significant differences in thorax length, suggesting that an important fraction of phenotypic variance can be attributed to environmental variability. However, laboratory and field work in different populations of D. buzzatii showed a significant genetic component for thorax length variation. |
| Keywords: | thorax length Drosophila buzzatii life history traits longevity natural selection |
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