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Colonization of Drosophila Subobscura in Chile: Experimental Preadult Competition With Local Species Under Bi- and Tri-Specific Conditions

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Preadult competition of Drosophila subobscura, D. simulans and D. pavani under mono, bi-and tri-specific conditions, was studied experimentally. The parameters analysed were egg-to-adult development time and preadult viability. The results showed that 1) the competitive ability of each species is modified when in bi- or tri-specific condition, 2) the outcome of competition in a 3 species system cannot be predicted from the pairwise interactions between species, 3) D. subobscura is a bad competitor. We discuss these findings in terms of the colonization of Chile by D. subobscura.

Affiliations: 1: Departamento de Biologia Celular y Genética, Facultad de Medicina, Universidad de Chile, Casilla 70061-Santiago 7, Chile; 2: Departamento de Biologia Celular y Genética, Facultad de Medicina, Universidad de Chile, Casilla 70061-Santiago 7, Chile, Departamento de Estudios Ambientales, Universidad Simón Bolivar, Caracas, Venezuela


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