Abstract
To characterize the morphological variation in a natural population of Drosophila mediopunctata, males were collected on three occasions at a single locality. From each wild-caught male 14 body measures were taken and the karyotype for inversions on chromosomes X and II was determined. Through a principal components analysis, two sources of variation, identified as size and shape, accounted for approximately 80 and 6 per cent of the total morphological variability, respectively. The shape component was determined primarily by variations in the position of the wing second longitudinal vein. Differences between collections were detected both for size and shape. An altitudinal cline was observed in respect of wing shape, although altitude explained only a small part of the shape variation. Size and shape were affected by chromosome II inversions. However, in respect of size, no direct differences were detected between karyotypes but a significant interaction between collecting date and karyotype was found. This suggests that karyotypes might differ in their norms of reaction in the field.
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Acknowledgements
We are grateful to Luis Lima Neto who provided us with the digitizing pad software, Dr Sergio Reis for invaluable suggestions during the development of this work and help with computation facilities and Dr Richard Strauss for insightful comments on the shearing method. We also thank Dr Antonio Bernardo de Carvalho, Dr Carlos R. Vilela and anonymous reviewers for critical comments of this manuscript. Mrs Clea Knauer da Silva gave us technical assistance. The Nücleo de Computacäo Gräfica da COPPE and NUTES from Universidade Federal do Rio de Janeiro provided facilities to perform part of this work. These investigations were supported by: Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq); Financiadora de Estudos e Projetos (FINEP); Coordenacäo de Aperfeicoamento de Pessoal de Ensino Superior (CAPES) and Fundacäo de Amparo ä Pesquisa do Rio de Janeiro (FAPERJ).
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Bitner-Mathé, B., Peixoto, A. & Klaczko, L. Morphological variation in a natural population of Drosophila mediopunctata: altitudinal cline, temporal changes and influence of chromosome inversions. Heredity 75, 54–61 (1995). https://doi.org/10.1038/hdy.1995.103
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DOI: https://doi.org/10.1038/hdy.1995.103
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