Table of Contents Author Guidelines Submit a Manuscript
The Scientific World Journal
Volume 2012, Article ID 138579, 7 pages
http://dx.doi.org/10.1100/2012/138579
Research Article

Variation in Nectar Volume and Sugar Concentration of Allium ursinum L. ssp. ucrainicum in Three Habitats

1Department of Pharmacognosy, Medical School, University of Pécs, Rókus u. 2. 7624 Pécs, Hungary
2Department of Plant Systematics and Geobotany, Faculty of Natural Sciences, University of Pécs, Ifjúság u. 6., 7624 Pécs, Hungary
3Department of Plant Taxonomy and Ecology, Loránd Eötvös University, Pázmány stny. 1., 1117 Budapest, Hungary

Received 28 October 2011; Accepted 22 December 2011

Academic Editor: Pekka Kaitaniemi

Copyright © 2012 Ágnes Farkas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Floral nectar volume and concentration of ramson (Allium ursinum L. ssp. ucrainicum) were investigated in three different habitats, including two types of sessile oak-hornbeam association on brown forest soil with clay illuviation and a silver lime-flowering ash rock forest association on rendzina. Daily nectar production ranged from 0.1 to 3.8 μL per flower with sugar concentrations of 25 to 50%. Mean nectar volumes and concentrations showed significant differences between freely exposed flowers and covered flowers, which had been isolated from flower visitors 24 h prior to nectar studies. Both the amount and quality of nectar were affected by microclimatic conditions and soil properties and varied between populations at different habitats. In the silver lime-flowering ash rock-forest association mean nectar volumes and concentrations were lower than in a typical sessile oak-hornbeam association on three occasions, the difference being significant in two cases. During full bloom, the date of sampling did not have a profound effect on either nectar volume or concentration.