Ecological and seasonal patterns in the diversity of a species-rich bee assemblage (Hymenoptera: Apoidea: Apiformes)
Oertli, S.(Swiss Federal Inst. of Technology, Zurich (Switzerland). Inst. of Plant Sciences and Applied Entomology) | Mueller, A. | Dorn, S.E-mail:[email protected]
The present two year study traced the ecological and seasonal patterns on 2 square km of a southern slope in the Swiss Alps, ranging from 1,150 to 1,550 m above sea level. The study area consisted mainly of hay meadows and pastures. A total of 247 bee species were recorded. Most species were rare with 14.6% represented by a single individual. Ecological analysis of the bee community showed that the primitively eusocial species were over represented among the abundant species and the parasitic species among the rarest. Both abundance and species richness were subject to marked seasonal variations. A substantial turnover in species composition as well as changes in ecological patterns were observed. More than 25% of all species were recorded in only one of the two years, in particular many of the parasitic species. The importance of season-long sampling and sampling over more than one year is underlined.
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