Predation on <i>Drosophila suzukii</i> within Hedges in the Agricultural Landscape

The invasive <i>Drosophila suzukii</i> feeds and reproduces on various cultivated and wild fruits and moves between agricultural and semi-natural habitats. Hedges in agricultural landscapes play a vital role in the population development of <i>D. suzukii</i>, but also harbor...

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Bibliographic Details
Main Authors: Alexandra Siffert, Fabian Cahenzli, Patrik Kehrli, Claudia Daniel, Virginie Dekumbis, Barbara Egger, Jana Furtwengler, Camille Minguely, Nicola Stäheli, Franco Widmer, Dominique Mazzi, Jana Collatz
Format: Article
Language:English
Published: MDPI AG 2021-03-01
Series:Insects
Subjects:
Online Access:https://www.mdpi.com/2075-4450/12/4/305
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Summary:The invasive <i>Drosophila suzukii</i> feeds and reproduces on various cultivated and wild fruits and moves between agricultural and semi-natural habitats. Hedges in agricultural landscapes play a vital role in the population development of <i>D. suzukii</i>, but also harbor a diverse community of natural enemies. We investigated predation by repeatedly exposing cohorts of <i>D. suzukii</i> pupae between June and October in dry and humid hedges at five different locations in Switzerland. We sampled predator communities and analyzed their gut content for the presence of <i>D. suzukii</i> DNA based on the COI marker. On average, 44% of the exposed pupae were predated. Predation was higher in dry than humid hedges, but did not differ significantly between pupae exposed on the ground or on branches and among sampling periods. Earwigs, spiders, and ants were the dominant predators. Predator communities did not vary significantly between hedge types or sampling periods. DNA of<i> D. suzukii</i> was detected in 3.4% of the earwigs, 1.8% of the spiders, and in one predatory bug (1.6%). While the molecular gut content analysis detected only a small proportion of predators that had fed on <i>D. suzukii</i>, overall predation seemed sufficient to reduce <i>D. suzukii</i> populations, in particular in hedges that provide few host fruit resources.
ISSN:2075-4450