Fairly common. More common before 1950, no trend since. Various habitats. Rare in most years, but sometimes common. Migration is a possible explanation for the strong fluctuations, but this seems unsatisfactory. A possibly better explanation is provided by a population-dynamic model by Zeegers (1991).
Bron
Auteur(s)
Zeegers, Th., Renema, W.
Publicatie
- Reemer, M., Renema, W., Steenis, W. van, Zeegers, Th., Barendregt, A., Smit, J.T., Veen, M.P. van, Steenis, J. van & Leij, L.J.J.M. van der 2009. De Nederlandse zweefvliegen (Diptera: Syrphidae). Nederlandse Fauna 8: 1-442. Nationaal Natuurhistorisch Museum Naturalis, KNNV Uitgeverij, European Invertebrate Survey - Nederland.