title: Phenotypic integration in style dimorphic daffodils (Narcissus, Amaryllidaceae) with different pollinators.
abstract: Different pollinators can exert different selective pressures on floral traits, depending on how they fit with flowers, which should be reflected in the patterns of variation and covariation of traits. Surprisingly, empirical evidence in support of this view is scarce. Here, we have studied whether the variation observed in floral phenotypic integration and covariation of traits in Narcissus species is associated with different groups of pollinators. Phenotypic integration was studied in two style dimorphic species, both with dimorphic populations mostly visited by long-tongued pollinators (close fit with flowers), and monomorphic populations visited by short-tongued insects (loose fit). For N. papyraceus, the patterns of variation and correlation among traits involved in different functions (attraction and fit with pollinators, transfer of pollen) were compared within and between population types. The genetic diversity of populations was also studied to control for possible effects on phenotypic variation. In both species, populations with long-tongued pollinators displayed greater phenotypic integration than those with short-tongued pollinators. Also, the correlations among traits involved in the same function were stronger than across functions. Furthermore, traits involved in the transfer of pollen were consistently more correlated and less variable than traits involved in the attraction of insects, and these differences were larger in dimorphic than monomorphic populations. In addition, population genetic parameters did not correlate with phenotypic integration or variation. Altogether, our results support current views of the role of pollinators in the evolution of floral integration.
authors.affiliation: School of Biological Sciences, University of Portsmouth, Portsmouth PO1 2DY, UK Departmento de Biología Vegetal y Ecología, University of Seville, Seville 41080, Spain rocio.barrales@port.ac.uk.
authors.forename: Rocío
authors.initials: R
authors.lastname: Pérez-Barrales
authors.affiliation: Departmento de Biología Vegetal y Ecología, University of Seville, Seville 41080, Spain.
authors.forename: Violeta I
authors.initials: VI
authors.lastname: Simón-Porcar
authors.affiliation: Departmento de Biología Vegetal y Ecología, University of Seville, Seville 41080, Spain.
authors.forename: Rocío
authors.initials: R
authors.lastname: Santos-Gally
authors.affiliation: Departmento de Biología Vegetal y Ecología, University of Seville, Seville 41080, Spain.
authors.forename: Juan
authors.initials: J
authors.lastname: Arroyo
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D035264:Flowers / Q000033:anatomy & histology*; D014644:Genetic Variation; D007313:Insecta / Q000033:anatomy & histology* / Q000235:genetics / Q000502:physiology; D031427:Narcissus / Q000033:anatomy & histology* / Q000235:genetics; D010641:Phenotype; D054817:Pollination / Q000502:physiology*; D012641:Selection, Genetic; D013045:Species Specificity
keywords: adaptation; genetic diversity; phenotypic selection; plasticity; pollinator-mediated selection; style dimorphism