Eur. J. Entomol. 104 (1): 51-56, 2007 | DOI: 10.14411/eje.2007.008
Aggregation characteristics of three species of Coccinellidae (Coleoptera) at hibernation sites
- 1 Research Institute of Crop Production, Drnovská 507, CZ 16106 Praha 6 - Ruzyně, Czech Republic; e-mail: honek@vurv.cz
- 2 Institute of Botany and Zoology, Masaryk University, Kotlářská 2, CZ 61137 Brno, Czech Republic
Adults of some coccinellid species overwinter in aggregations consisting of many individuals. They may clump because adults are attracted to particular environmental stimuli and/or of an innate tendency to join conspecific individuals. Aggregation behaviour was studied in Coccinella septempunctata L., which forms small clumps, and Ceratomegilla undecimnotata (Schneider) and Hippodamia variegata (Goeze), which form large clumps. Adults were recorded at five hilltop hibernacula (400-1500 m altitude) in central Europe (50-51°N, 14-16°E) for periods up to 27 years. The hibernacula occur in areas sparsely covered with isolated grass tussocks or completely with stones. Numbers of adults recorded under each of 300-900 stones or among the stems of the grass tussocks were counted every year at each hibernaculum. The degree of aggregation was determined using Taylor's power law. The coccinellid distributions became more aggregated and the size of the aggregations increased as their abundance increased, less in C. septempunctata than in the other two species. Aggregations formed even in the absence of prominent structures, which may attract immigrants, and even when unoccupied stones or tussocks suitable for overwintering were available. Aggregations may be established and their size limited by the strength of the intrinsic preference to join conspecifics. The supposed advantage of aggregated overwintering must be greater than the risk associated with the easy spread of diseases.
Keywords: Coleoptera, Coccinellidae, Coccinella septempunctata, Ceratomegilla undecimnotata, Hippodamia variegata, overwintering, distribution, hibernaculum
Received: May 11, 2006; Revised: September 7, 2006; Accepted: September 7, 2006; Published: January 3, 2007 Show citation
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