title: Association between floral traits and rewards in Erysimum mediohispanicum (Brassicaceae).
abstract: OBJECTIVE
  Floral rewards may be associated with certain morphological floral traits and thus act as underlying factors promoting selection on these traits. This study investigates whether some traits that are under pollinator-mediated selection (flower number, stalk height, corolla diameter, corolla tube length and corolla tube width) in the Mediterranean herb E. mediohispanicum (Brassicaceae) are associated with rewards (pollen and nectar).
  
  
  METHODS
  During 2005 the phenotypic traits and the visitation rate of the main pollinator functional groups were quantified in 720 plants belonging to eight populations in south-east Spain, and during 2006 the same phenotypic traits and the reward production were quantified in 400 additional plants from the same populations.
  
  
  RESULTS
  A significant correlation was found between nectar production rate and corolla tube length, and between pollen production and corolla diameter. Visitation rates of large bees and butterflies were significantly higher in plants exhibiting larger flowers with longer corolla tubes.
  
  
  CONCLUSIONS
  The association between reward production and floral traits may be a factor underlying the pattern of visitation rate displayed by some pollinators.
authors.affiliation: Departamento de Ecología, Universidad de Granada, Granada 18071, Spain. jmgreyes@ugr.es
authors.forename: José M
authors.initials: JM
authors.lastname: Gómez
authors.forename: Jordi
authors.initials: J
authors.lastname: Bosch
authors.forename: Francisco
authors.initials: F
authors.lastname: Perfectti
authors.forename: J D
authors.initials: JD
authors.lastname: Fernández
authors.forename: Mohamed
authors.initials: M
authors.lastname: Abdelaziz
authors.forename: J P M
authors.initials: JP
authors.lastname: Camacho
mesh_terms: D032601:Erysimum / Q000254:growth & development / Q000502:physiology*; D035264:Flowers / Q000254:growth & development / Q000502:physiology*; D011058:Pollen / Q000502:physiology; D054817:Pollination / Q000502:physiology