caa a22 4500 475750861 CHVBK 20180406123523.0 cr unu---uuuuu 170329e20000401xx s 000 0 eng 10.1023/A:1009802401955 doi (NATIONALLICENCE)springer-10.1023/A:1009802401955 Enhanced UV-B radiation, flower attributes and pollinator behaviour in Cistus creticus: a Mediterranean field study [Elektronische Daten] [M. Stephanou, Y. Petropoulou, O. Georgiou, Y. Manetas] The aim of this investigation was to examine the reasons for the higher pollination success in Cistus creticus under enhanced UV-B radiation (Stephanou & Manetas 1998). Thus, a selected array of floral attributes as well as the frequency and duration of insect visits were studied in the field under ambient or ambient plus supplemental UV-B radiation, simulating a 15% ozone depletion over Patras (38.3°N, 29.1°E). Video-recording revealed two categories of visitors, i.e. true pollinators (bees) and nectar thieves. The frequency of visits to both control and UV-B treated plants was the same and independent of whether the UV-B tubes were on or off during video recording. UV-B radiation had no effect on gross floral morphology (petal surface area, number of pollen grains, stamens and ovules, optical properties of petals and stamens), yet nectary size was almost doubled. In addition, the duration of insect visits was significantly longer on UV-B treated plants, provided that the UV-B tubes were off during monitoring. The differences were abolished during the part of the day that the tubes were on, indicating that the insects were annoyed by supplemental UV-B radiation. These results are consistent with the nectaries producing larger quantities of nectar, which caused the insects to stay longer on flowers of UV-B treated plants and improved pollination success. Kluwer Academic Publishers, 2000 Cistus czeticus nationallicence Nectary size nationallicence Pollinators nationallicence UV-B radiation nationallicence Visit duration nationallicence Stephanou M. Laboratory of Plant Physiology and Botany 2, Department of Biology, University of Patras, 26 500, Patras, Greece aut Petropoulou Y. Laboratory of Plant Physiology and Botany 2, Department of Biology, University of Patras, 26 500, Patras, Greece aut Georgiou O. Laboratory of Plant Physiology and Botany 2, Department of Biology, University of Patras, 26 500, Patras, Greece aut Manetas Y. Laboratory of Plant Physiology and Botany 2, Department of Biology, University of Patras, 26 500, Patras, Greece aut Plant Ecology Kluwer Academic Publishers 147/2(2000-04-01), 165-171 1385-0237 147:2<165 2000 147 11258 https://doi.org/10.1023/A:1009802401955 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1009802401955 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stephanou M. Laboratory of Plant Physiology and Botany 2, Department of Biology, University of Patras, 26 500, Patras, Greece aut NATIONALLICENCE 700 1- Petropoulou Y. Laboratory of Plant Physiology and Botany 2, Department of Biology, University of Patras, 26 500, Patras, Greece aut NATIONALLICENCE 700 1- Georgiou O. Laboratory of Plant Physiology and Botany 2, Department of Biology, University of Patras, 26 500, Patras, Greece aut NATIONALLICENCE 700 1- Manetas Y. Laboratory of Plant Physiology and Botany 2, Department of Biology, University of Patras, 26 500, Patras, Greece aut NATIONALLICENCE 773 0- Plant Ecology Kluwer Academic Publishers 147/2(2000-04-01), 165-171 1385-0237 147:2<165 2000 147 11258 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer