Effects of co-occurrence and intra- and interspecific interactions between Drosophila suzukii and Zaprionus indianus

Author:

de Paiva Mendonça Larine,Haddi Khalid,Godoy Wesley Augusto CondeORCID

Abstract

In drosophilids, competition and coexistence can impact survivorship, growth, and reproductive output. Here, we evaluated direct competition between two co-occurring fruit flies, the spotted-wing drosophilaDrosophila suzukiiand the African fig flyZaprionus indianus, comparing results from field collections with laboratory experiments. Field collections were conducted to evaluate co-occurrence between species. In the laboratory, different densities of eggs of each species were provided an artificial diet, and intra- and interspecific densities were evaluated regarding biological traits such as development and fecundity. Field collections showed a prevalence ofZ.indianus, followed by other drosophilid species, includingD.suzukii. Pupal survival and adult emergence were higher inD.suzukiithan inZ.indianusat both intra- and interspecific densities, with decreasing values in response to increased densities. Fecundity did not differ significantly for either species at different intraspecific densities, but when reared together at different densities,Z.indianuswas significantly more fecund thanD.suzukii. Development time showed no significant difference at intraspecific densities, but when reared together,Z.indianushad longer development times thanD.suzukii. Leslie Matrix projections indicated thatD.suzukiishowed practically the same dynamics at intraspecific and interspecific densities, with increasing oscillations at low and intermediate densities and decreasing oscillations at high densities.Zaprionus indianusshowed a similar oscillation toD.suzukii, except at intermediate intraspecific densities, when the pattern was cyclic. Low interspecific densities resulted in decreasing oscillations. In the two-choice oviposition bioassays,D.suzukiifemales showed no significant preference for diets previously infested or not with either conspecific or heterospecific eggs at different densities. Understanding competitive interactions between co-occurring heterospecific species should be considered when establishing management tactics for spotted-wing drosophila.

Funder

National Council of Scientific and Technological Development

Publisher

Public Library of Science (PLoS)

Subject

Multidisciplinary

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