Do microsporidia function as “biological weapon” for Harmonia axyridis under natural conditions?

  title={Do microsporidia function as “biological weapon” for Harmonia axyridis under natural conditions?},
  author={Tobias Gegner and Oliver Otti and Simon Tragust and Heike Feldhaar},
  journal={Insect Science},
Invasive alien species, such as the multicoloured Asian ladybird Harmonia axyridis, are often regarded as major drivers of biodiversity loss. Therefore understanding which characteristics or mechanisms contribute to their invasive success is important. Here the role of symbiotic microsporidia in the hemolymph of H. axyridis was investigated in the context of intraguild predation between wild‐caught H. axyridis and the native ladybird species Coccinella septempunctata. The microsporidia were… Expand
Predators and parasitoids of the harlequin ladybird, Harmonia axyridis, in its native range and invaded areas
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Intraguild predation between the invasive ladybird Harmonia axyridis and non-target European coccinellid species
Investigation of intraguild predation (IGP) between H. axyridis and eleven native non-target European coccinellids, including less common species which have not been studied so far within this context of non- target effects suggests that H.Axyridis may become a threat to a wide range of native aphidophagous coccINEllids sharing similar ecological niches except species showing high potential for chemical or physical protection. Expand
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It is shown that all H. axyridis beetles sourced from diverse collection sites all over the world carry abundant microsporidia, which suggests that both native and invasive H.Axyridis populations are associated with these tolerated parasites, which were likely to have existed in native populations before expansion rather than being acquired in newly colonized areas. Expand
Living with the enemy: parasites and pathogens of the ladybird Harmonia axyridis
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A Well Protected Intruder: The Effective Antimicrobial Defense of the Invasive Ladybird Harmonia axyridis
H. axyridis strongly inhibited the growth of Gram-positive and Gram-negative bacteria as well as yeast and MIC values of the hemolymph obtained from live beetles were significantly lower than from frozen insects, suggesting that the active antimicrobial compound is affected by freezing and subsequent thawing of the beetles. Expand
Horizontal transmission of a microsporidium from the convergent lady beetle, Hippodamia convergens Guérin-Méneville (Coleoptera: Coccinellidae), to three coccinellid species of Nova Scotia
E egg cannibalism and egg predation are examined as a means of horizontal transmission of the unidentified microsporidium among H. convergens larvae and three coccinellid species found in Nova Scotia: Coccinella septempunctata, C. trifasciata perplexa (three-banded lady beetle), and Harmonia axyridis (multicolored Asian lady beetle). Expand
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Effects of a microsporidium from the convergent lady beetle, Hippodamia convergens Guérin-Méneville (Coleoptera: Coccinellidae), on three non-target coccinellids.
A microsporidium from Hippodamia convergens was transmitted horizontally to three non-target coccinellid hosts (Adalia bipunctata L., Coccinella septempunctATA L. and Harmonia axyridis Pallas) under laboratory conditions and took significantly longer to develop than did uninfected larvae but the microspora had no effect on larval mortality. Expand
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