The influence of density-dependent factors on larval development in native and invasive populations of Harmonia axyridis (Pall.) (Coleoptera, Coccinellidae)

Reznik, S. Ya.; Belyakova, N. A.; Овчинников, А. Н.; Овчинникова, А. А.

doi:10.1134/s0013873817070016

Cited by 6 publications

(7 citation statements)

References 31 publications

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“…In particular, is it known that females and larvae of invasive populations of H. axyridis are more inclined to the consumption of conspecific eggs than individuals of native populations (Tayeh et al., ). Recent experiments conducted on the same populations that were used in the present study showed that an increase in larval population density resulted in a significant decrease in survival and in the rate of development only in individuals from the invasive population (Reznik et al., ). It is not improbable that some differences in the consequences of interlarval cannibalism between individuals from native and invasive populations of H. axyridis will be detected in further studies.…”

Section: Discussionmentioning

confidence: 63%

“…Then, four samples (five larvae each) were randomly selected from each class and exact weight of each larva in each sample was recorded. Larvae of the 1st and 3rd samples were placed individually in large plastic Petri dishes (90 × 15 mm), whereas larvae of the 2nd and 4th samples were kept in the same size Petri dish as a group of five; this density was selected based on the results of our previous study (Reznik et al., ). Food was not provided during the experiment, but larvae of the 1st and 2nd samples were offered Eppendorf tubes filled with water and plugged with a cotton ball.…”

Section: Methodsmentioning

confidence: 99%

“…It was shown that females and larvae of invasive populations of H. axyridis are more inclined to the consumption of conspecific eggs than larvae of native populations (Tayeh et al., ). Recently, we demonstrated that H. axyridis larvae of the invasive population have more aggressive interactions with even‐aged individuals than larvae of the native population (Reznik, Belyakova, Ovchinnikov, & Ovchinnikova, ). Therefore, it can be expected that individuals from native and invasive populations would differ also in manifestations of cannibalism.…”

Section: Introductionmentioning

confidence: 99%

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Costs and benefits of interlarval cannibalism in Harmonia axyridis

Reznik

Овчинников

Овчинникова

et al. 2017

J Applied Entomology

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Cannibalism, which is rather common in ladybirds, has been usually studied at the individual level: benefits of cannibalism for cannibals were estimated. Our study was conducted at the group level: we evaluated the overall effect of interlarval cannibalism on a group of Harmonia axyridis larvae of the fourth instar deprived of food, including both cannibals and their victims. 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. The proportion of samples in which at least one of five individuals pupated among the larvae kept individually was also higher than among those kept in groups suggesting that the eventual benefit of cannibalism was outweighed by the negative impact of aggressive interlarval interactions. The mean and minimum survival time in samples where none of five larvae pupated were longer when larvae were kept individually than when larvae were kept in groups.However, the maximum survival time (the survival time of the last larva in a sample) increased when larvae were kept in groups, which was the only one benefit of cannibalism found in our study. Under natural conditions, the possible adaptive value of this effect is that in the absence of natural prey, longer larval survival time proportionally increases the possibility of finding a new prey patch thereby ensuring survival of the population. K E Y W O R D Saphidophagous coccinellids, development, intraguild predation, starvation, survival

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Section: Discussionmentioning

confidence: 63%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Costs and benefits of interlarval cannibalism in Harmonia axyridis

Reznik

Овчинников

Овчинникова

et al. 2017

J Applied Entomology

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“…The paper [ 26 ] investigates the dependence of the mortality of fish larvae on their average weight. The effect on the survival of the factor related to competition for resources between the individual generation was established experimentally for the rate of development of the caterpillars of pests and ladybugs in the [ 27 ]. We solve the basic hybrid structure (1.2) numerically in relation to the auxiliary indicator of the dimensional characteristics of the generation.…”

Section: The Relation Between Auxiliary Equations and Predicatesmentioning

confidence: 99%

Methodology of the Construction of Computational Scenarios for Modeling Extreme States in Living Systems

Perevaryukha

2021

J. Comput. Syst. Sci. Int.

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We consider a methodology for organizing hybrid computing structures to simulate abrupt changes in controlled natural processes and analyzing phases of extreme environmental phenomena. Systems of differential equations with the dynamically redefinable right-hand side at special moments (events) are used. The truth conditions for transitions are obtained from computing other equations for additional characteristics of the state of a generation. Threshold states in process modeling are the result of the inclusion of trigger functions. Their values on the right-hand side are specifically different from the neutral value only in narrow ranges of the space of changing characteristics of a hybrid system and depend on the initial conditions. The restricted limits of functions and their domain of values rest on the core of the threshold effects for the simulated biosystem, which are observed under special conditions. The method allows us to implement actual qualitative changes in management scenarios as bifurcations of the appearance (reduction) of equilibrium states or the boundary crisis of a complex attractor consisting of intervals scattered in a limited area. Computational scenarios for different population processes are investigated. The collapse of fish stocks is described in the model by the examples of cod in the North Atlantic and sturgeon in the Caspian Sea. The rapid outbreak of their abundance is modeled according to observations on the pulsation of the population size of pests of relict evergreen forests. The threshold scenario of the outbreak of insects in the scenario ends spontaneously due to the local exhaustion of forest resources with a sharp transition to fluctuations of the pest, which are ordinary for the environment. The methodology of organizing the structure for the population model is summarized to predict a wide range of extreme processes related to rapid changes in controlled biological systems and the spread of unwanted biological invasions.

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“…Earlier studies demonstrated that H. axyridis larvae had a stronger cannibalism behavior than many other aphidophagous ladybirds and was independent from prey abundance (Reznik et al 2017) but increased with larval density (Michaud 2003). In field, the mortality of 4th instar larvae (93.30%) was higher than those of the other stages (less than 50.51%) due to the food storage and cannibalism (Osawa 1992a).…”

Section: Introductionmentioning

confidence: 97%

Obstructs-equipped apparatus reduces cannibalism and improves larval survival of the Coccinellid, Harmonia axyridis (Coleoptera: Coccinellidae)

Sun

Hao

Liu

et al. 2021

Egypt J Biol Pest Control

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Background Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) is an important biocontrol agent in native region of Asia, while its high propensity for cannibalism causes great obstacles in mass production. Provisioning obstructs in rearing containers could decrease the cannibalism of ladybird beetles. In this study, three different patterns of obstructs (Con-A, Con-B, and Con-C) were designed and equipped in plastic Petri dishes (95.38 cm3) as rearing units, and their efficiency for H. axyridis larval survival was tested. The potential of the high-density rearing was then evaluated using the optimal units with 16, 24, or 32 larvae per unit (named 16-L, 24-L, or 32-L, respectively). Results Larval survivals in obstructs-equipped units were generally higher than those in control, and significantly increased with the Con-C units (39.8% versus 74.2% at adult stage). With the Con-C units, the survivals were significantly higher at 16-L density (82.5%) than those at 24-L density (62.5%), but both were non-significantly different from those at 32-L density (70.0%). The weights of newly emerged adults (fit with the expected sex ratio of 1:1) at the higher densities were lower than those at 16-L density. Conclusions The results demonstrate that H. axyridis can be reared at a higher density (≈ 0.336 larvae/cm3) in a constrained unit and highlight the effects of obstructs in reducing cannibalism and improving insect survivals.

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The influence of density-dependent factors on larval development in native and invasive populations of Harmonia axyridis (Pall.) (Coleoptera, Coccinellidae)

Cited by 6 publications

References 31 publications

Costs and benefits of interlarval cannibalism in Harmonia axyridis

Costs and benefits of interlarval cannibalism in Harmonia axyridis

Methodology of the Construction of Computational Scenarios for Modeling Extreme States in Living Systems

Obstructs-equipped apparatus reduces cannibalism and improves larval survival of the Coccinellid, Harmonia axyridis (Coleoptera: Coccinellidae)

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