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Costs and benefits of interlarval cannibalism in Harmonia axyridis
TLDR
Experiments showed that the probability of pupation in larvae which were kept individually was significantly higher than in larvae kept in groups of five, other conditions being the same, suggesting that the eventual benefit of cannibalism was outweighed by the negative impact of aggressive interlarval interactions. Expand
Weak photoperiodic response facilitates the biological invasion of the harlequin ladybird Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae)
TLDR
Instead of a rapid micro‐evolutionary adaptation of the critical day length to a new climate, the invasive populations of the harlequin ladybird decrease their dependence onPhotoperiod and thus the weak photoperiodic response of SE Asian population of H. axyridis can be considered as a pre‐adaptation further developed during the invasion. Expand
Cumulative induction of diapause in successive generations of Trichogramma species (Hymenoptera, Trichogrammatidae)
TLDR
Trichogramma principium manifested an evident transgenerational cumulative photoperiodic response: the development of 1, 2, and 3 consecutive generations under the short day conditions caused a gradual increase in the proportion of diapausing progeny, which can be possibly explained by the different natural geographic ranges of the two studied species. Expand
Effect of photoperiod on adult size and weight in Harmonia axyridis (Coleoptera: Coccinellidae)
TLDR
The larvae reared under short-day conditions tended to develop faster and invest resources in structural growth rather than in increasing weight, which resulted in a significant decrease in the weight /size ratio of emerging adults, but their low initial nutritional status was partly compensated for by adult feeding. Expand
Interspecific variation in photoperiodic effect on the rate of preimaginal development in Harmonia axyridis (Pallas) (Coleoptera, Coccinellidae)
TLDR
Comparison of the parameters of photoperiodic responses showed that although the photoperperiodic effect on reproductive maturation in individuals from Sochi and Pardubice invasive populations was relatively weak, the effect of day length on the rate of their preimaginal development was even somewhat stronger than that of individuals from Irkutsk and Daegu native populations. Expand
Trophic induction of diapause in native and invasive populations of Harmonia axyridis (Coleoptera: Coccinellidae)
TLDR
Ovipositing females from invasive and native populations of Harmonia axyridis were fed one of a set of diets ranging from 50 Myzus persicae aphids every day to 1 aphid every 10 days and all were provided with a 10% sugar solution, and both photoperiodic and trophic effects were weak. Expand
Individual variability in the parameters of growth and development in invasive and autochthonous populations of Harmonia axyridis (Pallas) (Coleoptera, Coccinellidae)
TLDR
Experiments showed that under the same constant conditions individual variability in several important parameters of the life cycle of the predatory ladybird Harmonia axyridis is significantly higher than those in individuals from the strains which originated from autochthonous East Asian populations of the same species. Expand
The influence of density-dependent factors on larval development in native and invasive populations of Harmonia axyridis (Pall.) (Coleoptera, Coccinellidae)
TLDR
Data suggest that the influence of density-dependent factors on the development of H. axyridis depends significantly on larval prey species, and that larvae from the invasive population have somewhat more aggressive interactions with competitors, this possibly having been one of the prerequisites for invasion. Expand
The influence of temperature, photoperiod, and diet on development and reproduction in the four-spot lady beetle Harmonia quadripunctata (Pontoppidan) (Coleoptera, Coccinellidae)
TLDR
Relatively small body size, low fecundity, and a strong photoperiodic response that hinders rapid adaptation to novel climates probably explain the fact that H. quadripunctata, in contrast to H. axyridis, has not become an aggressive invader. Expand
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