caa a22 4500 477038999 CHVBK 20180405111312.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00984753 doi (NATIONALLICENCE)springer-10.1007/BF00984753 Lunau Klaus Institut für Zoologie, Universitätsstrasse 31, D-93040, Regensburg, Germany aut Unidirectionality of floral colour changes [Elektronische Daten] [Klaus Lunau] Many angiosperms have arranged their flowers in inflorescences forming a distinct signalling unit to flower visitors. In some species, the flowers of inflorescences undergo a temporal colour change corresponding exactly to a change in the reward status. Based on information obtained from the spectral reflection curves of pre-change and postchage colours of flower corollas and/or floral guides, it was possible to demonstrate that the colour phase associated with reward closely corresponds to the visual stimuli which trigger behavioural responses of inexperienced flower visitors, and that the colour phase associated with less reward corresponds to visual stimuli less attractive to naïve flower visitors. Reciprocal colour changes were not observed. It is to be assumed that the unidirectionality of floral colour changes is an adaptation of angiosperms aimed at the guidance of first-time flower visitors. Signalling reward to inexperienced flower visitors is an additional function of floral colour changes. The main function of floral colour changes, however, is to provide cues with which the flower visitors can learn to associate one colour phase with reward. Springer-Verlag, 1996 Angiosperms nationallicence Colour change nationallicence floral colour phase nationallicence innate flower detection nationallicence colour preference nationallicence pollination nationallicence Plant Systematics and Evolution Springer-Verlag 200/1-2(1996-03-01), 125-140 0378-2697 200:1-2<125 1996 200 606 https://doi.org/10.1007/BF00984753 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00984753 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Lunau Klaus Institut für Zoologie, Universitätsstrasse 31, D-93040, Regensburg, Germany aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 200/1-2(1996-03-01), 125-140 0378-2697 200:1-2<125 1996 200 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer