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vol.30 número2Eficiência de diferentes taxas de liberação do feromônio de agregação na captura de Rhynchophorus palmarum L. (Coleoptera: Curculionidae)Comunidade de cigarrinhas (Hemiptera: Auchenorrhyncha) de uma área de campo do município de Viamão, Rio Grande do Sul, Brasil índice de autoresíndice de assuntospesquisa de artigos
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Neotropical Entomology

versão impressa ISSN 1519-566Xversão On-line ISSN 1678-8052


LOMONACO, CECÍLIA  e  GERMANOS, ÉRIKA. Phenotypic variation of Musca domestica L. (Diptera: Muscidae) as a response to larval competition for food. Neotrop. Entomol. [online]. 2001, vol.30, n.2, pp.223-231. ISSN 1678-8052.

Phenotypic variations on developmental period, size and fluctuating asymmetry (FA) of Musca domestica L., induced by larval competition for food were described and correlated. Ten densities, varying from 100 to 1000 larvae per 75 g of wheat medium, were established in the laboratory and observed until adult emergence. The adjusted curve of survival was similar to a hyperbola. The developmental period extended with increasing densities, and the size was inversely proportional to the degree of larval crowding. Males and females responded differently to the selection pressures of competition, being size of the males much more variable than those of the females. Although morphological and physiological adjustments caused by environmental interaction were detected, the levels of fluctuating asymmetry remained invariable. Genetic correlation between these types of phenotypic variation was not detected. It can be supposed, however, that levels of FA, which are stress indicative, were minimized by the considerably plastic potential of the species. Thus, physiological and morphological adjustments reduced developmental difficulties and promoted survival of a greater number of individuals.

Palavras-chave : Insecta; developmental noise; phenotypic plasticity; fluctuating asymmetry; genetic correlation.

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