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Pollinator-mediated selection on floral display and flowering time in the perennial herb Arabidopsis lyrata
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Ecological Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution.
2009 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 63, no 5, 1292-1300 p.Article in journal (Refereed) Published
Abstract [en]

The evolution of floral display and flowering time in animal-pollinated plants is commonly attributed to pollinator-mediated selection. Yet, the causes of selection on flowering phenology and traits contributing to floral display have rarely been tested experimentally in natural populations. We quantified phenotypic selection on morphological and phenological characters in the perennial, outcrossing herb Arabidopsis lyrata in two years using female reproductive success as a proxy of fitness. To determine whether selection on floral display and flowering   phenology can be attributed to interactions with pollinators, selection   was quantified both for open-pollinated controls and for plants receiving supplemental hand-pollination. We documented directional selection for many flowers, large petals, late start of flowering, and early end of flowering. Seed output was pollen-limited in both years   and supplemental hand-pollination reduced the magnitude of selection on number of flowers, and reversed the direction of selection on end of flowering. The results demonstrate that interactions with pollinators may affect the strength of selection on floral display and the   direction of selection on phenology of flowering in natural plant populations. They thus support the contention that pollinators can drive the evolution of both floral display and flowering time.

Place, publisher, year, edition, pages
2009. Vol. 63, no 5, 1292-1300 p.
Keyword [en]
Floral display, flower size, flowering phenology, natural selection, pollen limitation, selection gradients
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-95495DOI: 10.1111/j.1558-5646.2009.00624.xISI: 000265145800014OAI: oai:DiVA.org:uu-95495DiVA: diva2:169734
Available from: 2007-03-12 Created: 2007-03-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Plant-Animal Interactions and Evolution of Floral Display and Flowering Phenology in Arabidopsis lyrata
Open this publication in new window or tab >>Plant-Animal Interactions and Evolution of Floral Display and Flowering Phenology in Arabidopsis lyrata
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Samspelet mellan växter och djur och evolution av blommor och blomningstid hos strandtrav
Abstract [en]

In this thesis, I combined comparative and experimental approaches to examine selection on reproductive traits, and population differentiation in the insect-pollinated, outcrossing, perennial herb Arabidopsis lyrata. More specifically, I (1) determined whether selection on flowering phenology and floral display can be attributed to interactions with pollinators and herbivores, (2) examined whether population differentiation in flowering phenology and floral display is correlated with current selection on these traits, and (3) tested for local adaptation from contrasting environments in Europe.

A field experiment conducted in a Swedish population demonstrated, that interactions with pollinators may markedly affect selection on both floral display and phenology of flowering. In an alpine population in Norway, grazing damage to inflorescences strongly influenced selection on floral display. The results suggest that variation in the abundance of pollinators and herbivores should contribute to spatio-temporal variation in selection on flowering phenology and floral display in A. lyrata.

A common-garden experiment showed that flowering phenology and floral display vary among Scandinavian populations of A. lyrata. For some traits patterns of population differentiation were consistent with differences in the direction and strength of phenotypic selection determined in comparisons (a) between an alpine population in Norway and a coastal population in Sweden, and (b) among coastal populations in Sweden. This suggests that current selection contributes to the maintenance of genetic differentiation in these traits.

Adaptive differentiation among populations was examined in a reciprocal transplant experiment that included populations from three contrasting environments, alpine Norway, coastal Sweden and lowland, continental Germany. The experiment provided evidence for local adaptation, and indicated that populations have diverged in traits affecting plant establishment and early growth.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 38 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 274
Keyword
Ecology, Arabidopsis lyrata, natural selection, floral display, phenology, flowering time, plant-animal interactions, pollination, herbivory, selection gradients, population differentiation, local adaptation, Ekologi
Identifiers
urn:nbn:se:uu:diva-7592 (URN)978-91-554-6808-X (ISBN)
Public defence
2007-03-31, Föreläsningssalen, Avdelningen för växtekologi, Villavägen 14, Uppsala, 10:00
Opponent
Supervisors
Available from: 2007-03-12 Created: 2007-03-12Bibliographically approved

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