Temporal stability of morph frequency in central European populations of Adalia bipunctata and A. decempunctata (Coleoptera: Coccinellidae)
Honek, A.(Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic))E-mail:[email protected] | Martinkova, Z. | Pekar, S.
Temporal variation in the relative frequency of 2 morphs of Adalia bipunctata and 3 morphs of A. decempunctata was recorded in the Czech Republic. Seasonal trends were investigated in samples collected by a light-trap run daily from March to November for 14 years. In A. bipunctata the melanic form was more abundant in autumn than in spring but the difference was not significant. In A. decempunctata morph proportions did not change seasonally. Samples were also collected by sweepnet from stands of many plant species. There was no influence of plant species on morph proportions. Long-term changes in morph proportions were analysed by pooling annual samples over all host plants. In A. bipunctata, there was no significant change in proportion of typical (90.1%) and melanic (9.9%) forms. In A. decempunctata the proportions of spotted (mean over 12 years 29.4%), chequered (42.2%) and dark (21.3%) morphs varied between years.
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