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First published online November 14, 2008
Journal of Experimental Biology 211, 3729-3736 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.022970

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The connection between landscapes and the solar ephemeris in honeybees

William F. Towne^* and Heather Moscrip

Department of Biology, Kutztown University of Pennsylvania, Kutztown, PA 19530, USA

^* Author for correspondence (e-mail: towne{at}kutztown.edu)

Accepted 30 September 2008

Honeybees connect the sun's daily pattern of azimuthal movement to some aspect of the landscape around their nests. In the present study, we ask what aspect of the landscape is used in this context – the entire landscape panorama or only sectors seen along familiar flight routes. Previous studies of the solar ephemeris memory in bees have generally used bees that had experience flying a specific route, usually along a treeline, to a feeder. When such bees were moved to a differently oriented treeline on overcast days, the bees oriented their communicative dances as if they were still at the first treeline, based on a memory of the sun's course in relation to some aspect of the site, possibly the familiar route along the treeline or possibly the entire landscape or skyline panorama. Our results show that bees lacking specific flight-route training can nonetheless recall the sun's compass bearing relative to novel flight routes in their natal landscape. Specifically, we moved a hive from one landscape to a differently oriented twin landscape, and only after transplantation under overcast skies did we move a feeder away from the hive. These bees nonetheless danced accurately by memory of the sun's course in relation to their natal landscape. The bees' knowledge of the relationship between the sun and landscape, therefore, is not limited to familiar flight routes and so may encompass, at least functionally, the entire panorama. Further evidence suggests that the skyline in particular may be the bees' preferred reference in this context.

Key words: honeybee, sun compass, landmarks, landscape, skyline, panorama, orientation

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