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Population field studies on the aphidophagous ladybird beetle Harmonia axyridis (Coleoptera: Coccinellidae): resource tracking and population characteristics
  • N. Osawa
  • Biology
  • Population Ecology
  • 27 September 2000
Abstract To clarify functional and numerical responses to temporal and spatial variations of resources (resource tracking), and the population characteristics of the ladybird beetle HarmoniaExpand
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Seasonal variation in elytral colour polymorphism in Harmonia axyridis (the ladybird beetle): the role of non-random mating
Seasonal variation in the frequency of elytral colour polymorphism in the ladybird beetle, Harmonia axyridis, was analysed through the combination of field observations and laboratory mate-choiceExpand
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Sibling cannibalism in the ladybird beetleHarmonia axyridis: Fitness consequences for mother and offspring
  • N. Osawa
  • Biology
  • Researches on Population Ecology
  • 1 June 1992
The adaptive significance of sibling cannibalism was analyzed in the ladybird beetleHarmonia axyridis at two prey densities. Possible costs and benefits were considered from three points of view: theExpand
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Residues of doxycycline and oxytetracycline in eggs after medication via drinking water to laying hens.
Doxycycline (DOTC) and oxytetracycline (OTC) were dissolved in drinking water (0.5 g/l) and supplied to laying hens for 7 consecutive days. Eggs laid were collected daily during and after medication,Expand
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Asymmetric reproductive interference between specialist and generalist predatory ladybirds.
1. Closely related species often differ greatly in the quality and breadth of resources exploited, but the actual mechanisms causing these differences are poorly understood. Because in the laboratoryExpand
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The harlequin ladybird, Harmonia axyridis: global perspectives on invasion history and ecology
The harlequin ladybird, Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), is native to Asia but has been intentionally introduced to many countries as a biological control agent of pestExpand
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Sibling and non-sibling cannibalism by larvae of a lady beetleHarmonia axyridis Pallas (Coleoptera: Coccinellidae) in the field
  • N. Osawa
  • Biology
  • Researches on Population Ecology
  • 1 June 1989
Sibling (cannibalism among siblings) and non-sibling cannibalism (cannibalism among non-siblings) were studied in a natural population of a lady beetle,Harmonia axyridis Pallas. Of all the eggs laidExpand
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Population field studies of the aphidophagous ladybird beetleHarmonia axyridis (Coleoptera: Coccinellidae): Life tables and key factor analysis
  • N. Osawa
  • Biology
  • Researches on Population Ecology
  • 1 December 1993
1) Life tables of the predatory ladybird beetleHarmonia axyridis were analysed by taking samples from twenty or twenty four sites colonized by eight species of aphids for two years. 2) LarvalExpand
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