Estudo de viabilidade ovo-adulto de espécies de drosophila emergidas de fruto de parhancornia amapa (apocynaceae).

Abstract

Drosophila malerkotliana is an invasive species recently found in Amazonian forests, reaching considerable frequencies among insects emerging from natural resources. The reasons for the success of invasive species are still subject of intense discussion and the establishment of the population parameters and life strategies of the species seem to be important steps to elucidate these questions. In order to contribute to the understanding of their resource utilization strategies, a comparative study of egg-adult viability between D. malerkotliana and some congener and emerging species of the same resource was carried out. Comparisons were made using three levels of egg density (200, 100 and 20), with native fruit (Parhancornia amapa) and culture medium as the substrate for larval development. The viability data showed specific differences in responses to density variation and also interactive behavior related to the type of substrate used. D. malerkotliana shows higher mean viability than the native species, reaching the highest rates in the high density culture medium, while the response of the native species is more variable, the Subgroup willistoni tends to follow D. malerkotliana while D. sturtevanti reaches higher viability in the fruit with higher egg density.