The preferred and the near - the actual hoverfly preferences for host plants and the role of spatial aspect

Janovský, Z. (1), Pospíšková, M. (1), Smyčka, J. (1), Herben, T. (1,2)

1) Dept. of Botany, Faculty of Science, Charles University in Prague
2) Institute of Botany, Czech Academy of Sciences, Průhonice by Prague, Czech Republic

Hoverflies are one of the key pollinator groups in temperate ecosystems. They are usually considered to be generalist pollinators, though exhibiting flower constancy. We studied preferences and constancy of several common species for their key host plants both by means of observation of hoverfly distribution at small spatial scale in a meadow and by means of choice trials independent of the spatial aspect.

Based upon the results of spatially independent choice trials we have constructed a predicted hoverfly distribution in the meadow by transition matrices. We compared the predicted pollinator species distribution amongst host plants with the observed one. We hypothesize that the observed discrepancies between them are attributable to the plant aggregation. Thus the host plant distribution actually "reinforces" the otherwise usually weak hoverfly preferences and constancy and results in their acting as far more specific pollinators than previously thought.

Presentováno na 2. Mezinárodní konferenci o statistické ekologii v Sundvollenu u Oslo ve dnech 3.-6.7. 2012.

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