Are there fitness advantages in being a rewardless orchid? Reward supplementation experiments with Barlia robertiana.

Détails

ID Serval
serval:BIB_81878BEC1227
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Are there fitness advantages in being a rewardless orchid? Reward supplementation experiments with Barlia robertiana.
Périodique
Proceedings. Biological Sciences / the Royal Society
Auteur(s)
Smithson A., Gigord L.D.
ISSN
0962-8452 (Print)
ISSN-L
0962-8452
Statut éditorial
Publié
Date de publication
07/2001
Volume
268
Numéro
1475
Pages
1435-1441
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
The Orchidaceae characteristically contain a very large number of species that attract pollinators but do not offer them any form of reward in return for visitation. Such a strategy is highly unusual in the plant kingdom. We conducted experiments in order to manipulate the reward strategy of the rewardless bumble-bee-pollinated orchid Barlia robertiana by adding sucrose solution to inflorescences. We found that supplementation decreased the probability of a pollinator removing pollinia by approximately ten times. Despite pollinators visiting many more flowers per inflorescence on supplemented plants, eight times fewer pollinia were removed from supplemented inflorescences during each visit. Pollinia deposition patterns were not significantly affected by supplementation and no geitonogamous deposition was recorded. In populations where inflorescences were supplemented for 20 days, pollinia removal was reduced by over half for supplemented inflorescences, whereas fruit set was unmodified by supplementation. We conclude that rewardlessness would increase total seed paternity, but not change either total seed maternity or the probability that offspring were outcrossed in this species. To the authors' knowledge this is the first time that there has been an unequivocal experimental demonstration of an evolutionary advantage for rewardlessness in the Orchidaceae.
Mots-clé
Analysis of Variance, Animals, Bees/physiology, Behavior, Animal, Fruit/growth & development, Orchidaceae/physiology, Plant Stems/growth & development, Pollen/physiology, Reproduction, Seeds/drug effects, Seeds/growth & development, Sucrose/pharmacology
Pubmed
Web of science
Création de la notice
24/01/2008 20:08
Dernière modification de la notice
03/03/2018 18:48
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