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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Sexual dimorphism of body size and sternopleural bristle number: A comparison of geographic populations of an invasive cosmopolitan drosophilid
Genetica, Volume 128, No. 1-3, Year 2006
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Description
Zaprionus indianus is a cosmopolitan drosophilid, of Afrotropical origin, which has recently colonized South America. The sexual dimorphism (SD) of body size is low, males being almost as big as females. We investigated 10 natural populations, 5 from America and 5 from Africa, using the isofemale line technique. Three traits were measured on each fly: wing and thorax length and sternopleural bristle number. Two indices of SD were compared, and found to be highly correlated (r > 0.99). For the sake of simplicity, only the female/male (F/M) ratio was further considered. A significant genetic variability of SD was found in all cases, although with a low heritability (intra-class correlation of 0.13), about half the value found for the traits themselves. For size SD, we did not find any variation among continents or any latitudinal trend, and average values were 1.02 for wing length and 1.01 for thorax length. Bristle number SD was much greater (1.07). Among mass laboratory strains, SD was genetically much more variable than in recently collected populations, a likely consequence of laboratory drift. Altogether, SD, although genetically variable and prone to laboratory drift, is independent of size variations and presumably submitted to a stabilizing selection in nature. © 2006 Springer.
Authors & Co-Authors
David, Jean Robert
France, Paris
Cnrs Centre National de la Recherche Scientifique
Araripe, Luciana Ordunha
Brazil, Campinas
Universidade Estadual de Campinas
Bitner-Mathé, Blanche Christine
Brazil, Rio de Janeiro
Universidade Federal do Rio de Janeiro
Capy, Pierre
France, Paris
Cnrs Centre National de la Recherche Scientifique
Goñi, Beatriz
Uruguay, Montevideo
Facultad de Ciencias
Klaczko, Louis Bernard
Brazil, Campinas
Universidade Estadual de Campinas
Legout, Hélène
France, Paris
Cnrs Centre National de la Recherche Scientifique
Martíns, Marlúcia Bonifácio
Brazil, Belem
Museu pe
Vouidibio, Joseph
Congo
Université de Brazzaville
Yassin, Amir
Egypt, Alexandria
Alexandria University
Moréteau, Brigitte
France, Paris
Cnrs Centre National de la Recherche Scientifique
Statistics
Citations: 26
Authors: 11
Affiliations: 7
Identifiers
Doi:
10.1007/s10709-005-5539-5
ISSN:
00166707
Research Areas
Genetics And Genomics
Sexual And Reproductive Health
Participants Gender
Male
Female