Why does the hoverfly Metasyrphus corollae migrate?

@article{Svensson1984WhyDT,
  title={Why does the hoverfly Metasyrphus corollae migrate?},
  author={Bo G. Svensson and L. {\AA}. Janzon},
  journal={Ecological Entomology},
  year={1984},
  volume={9}
}
Abstract. 1. Migration pattern and mass appearance of the hoverfly Metasyrphus corollae (F.) (Diptera, Syrphidae) were investigated on the SE coast of Sweden in 1981. In total, 4433 hoverflies, belonging to fifteen species, were collected in water traps during 4–6 August. All but 2.2% were M.corollae, 3282 specimens being caught on 4 August, 1021 on 5 August and thirty‐five on 6 August. 
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