Flower-visitor selection on floral integration in three contrasting populations of Lonicera implexa.
Am J Bot
; 103(2): 325-36, 2016 Feb.
Article
em En
| MEDLINE
| ID: mdl-26865120
ABSTRACT
PREMISE OF THE STUDY Geographic differences in flower visitor assemblages might lead to among-population differences in the magnitude and pattern of floral integration. However, the role of current pollinator visitation in shaping the magnitude and pattern of floral trait correlations is still controversial. METHODS:
We used individual-level data on floral morphology, flower visitation, and fitness to assess if floral integration (at flower and floral-module level) and the covariance structure of floral traits varied among three populations of Lonicera implexa differing in the importance of long-tongue (hawk moths) and short-tongue (bees and small beetles) pollinators; and to assess whether this variation was related to the selection pressures exerted by flower visitors. KEYRESULTS:
Short-tongue pollinators preferentially visited plants with floral traits that enhanced flower accessibility; consequently, there was directional selection for accessibility (integration at floral-module level) in the populations where they dominated or codominated. In the population with both short- and long-tongue pollinators, disruptive selection on corolla width and directional selection against whole-flower integration was also found. Dominance by long-tongue pollinators (hawk moths) resulted in disruptive selection on whole-flower integration. Overall, the conflicting selection pressures that were found matched among-population differences in covariance structure populations with short-tongue pollinators showed correlations between corolla-tube width and other floral traits that were absent in the population pollinated primarily by hawk moths.CONCLUSIONS:
Conflicting selection on floral integration mediated by floral visitors can occur even in nearby populations of a species with restricted floral morphology.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Lonicera
/
Flores
/
Polinização
/
Aptidão Genética
/
Insetos
Limite:
Animals
País/Região como assunto:
Europa
Idioma:
En
Revista:
Am J Bot
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Espanha