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• W1902921253 endingPage "730" @default.
• W1902921253 startingPage "719" @default.
• W1902921253 abstract "Despite their positive effect in reducing pest populations, exotic generalist predators sometimes become invasive and contribute to the displacement of indigenous species in the same trophic level. Although laboratory experiments have linked intraguild predation (IGP) to these interactions, field evidence and quantification of IGP are still lacking for most systems. The recent establishment of the exotic Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) in Italy raises concern about the detrimental effect that the ladybird could have on native coccinellids. Here we assessed, under laboratory conditions, the acceptability and suitability of eggs of 2 native ladybirds, Adalia bipunctata L. and Oenopia conglobata (L.), as prey items for H. axyridis larvae. Then we developed primers for molecular gut-content analysis to detect predation by H. axyridis on the 2 ladybirds and on the aphid Eucallipterus tiliae L. Species-specific 16S primers were developed for the 3 species and laboratory feeding trials were conducted to quantify the rate of prey DNA breakdown in the gut of H. axyridis. Moreover, to field evaluate primers, H. axyridis 4th instars (n = 132) were systematically collected from linden trees in northern Italy and screened for the presence of prey DNA. Seventy-three percent and 7% of field collected H. axyridis were positive for aphid and coccinellid DNA, respectively. Predation upon aphid and A. bipunctata was lower than predicted if density dependent consumption was expected, while predation upon O. conglobata was significantly higher. Here, we provided the first evidence of IGP among feral populations of H. axyridis and indigenous ladybird beetles, occurring in Italy." @default.
• W1902921253 created "2016-06-24" @default.
• W1902921253 creator A5018357966 @default.
• W1902921253 creator A5025438284 @default.
• W1902921253 creator A5029837905 @default.
• W1902921253 creator A5032644900 @default.
• W1902921253 creator A5037667640 @default.
• W1902921253 creator A5039413910 @default.
• W1902921253 date "2014-12-15" @default.
• W1902921253 modified "2023-09-24" @default.
• W1902921253 title "Development and application of molecular gut-content analysis to detect aphid and coccinellid predation by<i>Harmonia axyridis</i>(Coleoptera: Coccinellidae) in Italy" @default.
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