Editor A. Dafni
Flowering dynamics and pollination system of the sedge Rhynchospora ciliata (Vahl) Kükenth (Cyperaceae): does ambophily enhance its reproductive success?
Article first published online: 30 MAY 2012
© 2012 German Botanical Society and The Royal Botanical Society of the Netherlands
Volume 14, Issue 6, pages 881–887, November 2012
How to Cite
Costa, A. C. G. and Machado, I. C. (2012), Flowering dynamics and pollination system of the sedge Rhynchospora ciliata (Vahl) Kükenth (Cyperaceae): does ambophily enhance its reproductive success?. Plant Biology, 14: 881–887. doi: 10.1111/j.1438-8677.2012.00574.x
- Issue published online: 29 OCT 2012
- Article first published online: 30 MAY 2012
- Received: 28 November 2011; Accepted: 25 January 2012
- Atlantic Forest;
- mixed pollination system;
- pollen tube;
- ultraviolet light reflection
Cyperaceae are characteristically anemophilous, but there are some reports of species re-adapted to entomophily, such as Rhynchospora ciliata. Our objective was to investigate: (1) the distribution pattern of flowers in inflorescences of Rhynchospora ciliata; (2) the dynamics of its anthesis; and (3) whether R. ciliata is pollinated by bees, by wind or by both. Additionally, we tested the hypotheses: (i) the hypsophylls and/or anthers attract pollinators, and (ii) biotic vectors enhance the reproductive success of R. ciliata. We analysed floral biology, dynamics of anthesis, frequency and behaviour of insects visiting flowers; we also carried out experiments on flower attractiveness, pollination by wind and reproductive success. Rhynchospora ciliata has flowers with anemophilous attributes, including anthers exposed during anthesis; however, the anthers (here considered a mixed trait) together with the white hypsophylls can be considered as attributes that favour entomophily. Both wind and four species of bee were considered as pollen vectors of R. ciliata. Through flower attractiveness tests, we observed that the hypsophylls do not affect the frequency of pollinating bees and that the absence of exposed anthers affects the average number of visits, probably because pollen is the only floral resource. Reproductive tests indicate that R. ciliata is self-incompatible and that ambophily enhances its reproductive success.