Do rewardless orchids show a positive relationship between phenotypic diversity and reproductive success?

Détails

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Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_0A9C6966C94B
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Do rewardless orchids show a positive relationship between phenotypic diversity and reproductive success?
Périodique
Ecology
Auteur(s)
Smithson A., Juillet N., Macnair M. R., Gigord L. D.
ISSN
0012-9658 (Print)
Statut éditorial
Publié
Date de publication
02/2007
Volume
88
Numéro
2
Pages
434-42
Notes
Journal Article Research Support, Non-U.S. Gov't --- Old month value: Feb
Résumé
Among rewardless orchids, pollinator sampling behavior has been suggested to drive a positive relationship between population phenotypic variability and absolute reproductive success, and hence population fitness. We tested this hypothesis by constructing experimental arrays using the rewardless orchid Dactylorhiza sambucina, which is dimorphic for corolla color. We found no evidence that polymorphic arrays had higher mean reproductive success than monomorphic arrays for pollinia removal, pollen deposition, or fruit set. For pollinia removal, monomorphic yellow arrays had significantly greater reproductive success, and monomorphic red the least. A tendency for yellow arrays to have higher pollen deposition was also found. We argue that differential population fitness was most likely to reflect differential numbers of pollinators attracted to arrays, through preferential long-distance attraction to arrays with yellow inflorescences. Correlative studies of absolute reproductive success in 52 populations of D. sambucina supported our experimental results. To our knowledge this is the first study to suggest that attraction of a greater number of pollinators to rewardless orchids may be of greater functional importance to population fitness, and thus ecology and conservation, than are the behavioral sequences of individual pollinators.
Mots-clé
Animals Bees/*physiology Ecosystem Flowers/*physiology Orchidaceae/genetics/*physiology Phenotype Pigmentation/genetics/*physiology *Polymorphism, Genetic Reproduction/physiology
Pubmed
Web of science
Open Access
Oui
Création de la notice
24/01/2008 20:07
Dernière modification de la notice
08/05/2019 14:13
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