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Comparative transcriptomics in three ladybird species supports a role for immunity in invasion biology

: Vogel, H.; Schmidtberg, H.; Vilcinskas, A.


Developmental and comparative immunology : DCI 67 (2016), pp.452-456
ISSN: 0145-305x
ISSN: 1879-0089
Journal Article
Fraunhofer IME ()

The spread of the invasive harlequin ladybird (Harmonia axyridis) in Europe is accompanied by the decline of the native and non-invasive two-spotted ladybird (Adalia bipunctata). Here we show that microsporidia carried by . H.,axyridis can kill . A.,bipunctata following the oral uptake of spores, suggesting that their horizontal transmission via intraguild predation may help the invader to outcompete its native competitor. The native seven-spotted ladybird (Coccinella septempunctata) is thought to be less susceptible both to the spread of . H.,axyridis and to its microsporidia. To investigate whether the distinct levels of pathogen susceptibility in these three ladybird species are determined by their immune systems, we compared the immunity-related transcriptomes of untreated beetles and beetles challenged with suspensions of bacteria and yeast. We found that .