Eur. J. Entomol. 102 (3): 539-545, 2005 | 10.14411/eje.2005.077

Landscape parameters explain the distribution and abundance of Episyrphus balteatus (Diptera: Syrphidae)

Jean-Pierre SARTHOU1, Annie OUIN1, Florent ARRIGNON1, GaŽl BARREAU2, Bernard BOUYJOU1
1 Ecole Nationale Supťrieure Agronomique de Toulouse, UMR Dynafor, BP 107, F-31326 Auzeville-Tolosane, France; e-mail: sarthou@ensat.fr
2 12, rue Claude Bizot, F-33170 Gradignan, France

We studied the importance of forest structure (shape, edge length and orientation) and the crop mosaic (percentage of crops in the total land cover, within 100 and 2000 m from the forests) to the dynamics of an aphidophagous hoverfly Episyrphus balteatus. Adults were collected by Malaise traps located within and on the south- and north-facing edges of 54 forests. In winter, E. balteatus was only found on south-facing edges because of the greater insolation and temperature. In summer, it was more abundant on north-facing edges because of the abundant presence of flowers. In spring, more adults were found on long and south-facing edges than on northern edges. The presence of shrubs within 2000 m also positively affected abundance. In autumn, abundance was positively associated with length of the north-facing edge and forest shape. Emergence traps revealed that in southern France, E. balteatus may overwinter in the larval or puparial stage in forest edges. Overwintering was earlier reported only in adults. Landscape structure, length of forest edges and probably presence of shrub fallows, influence abundance of Episyrphus balteatus.

Keywords: Syrphidae, Episyrphus balteatus, distribution, abundance, seasons, forest edges, landscape

Received: September 27, 2004; Accepted: April 13, 2005; Published: August 15, 2005

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