Biodiversity Science ›› 2012, Vol. 20 ›› Issue (3): 317-323.doi: 10.3724/SP.J.1003.2012.07084

Special Issue: Polination Biology: Theory and Primary Practice

• Original Papers • Previous Article     Next Article

Floral traits, pollinator assemblages, and phenotypic selection at different flowering time for Trollius ranunculoides

Lele Liu1, 2, Zuojun Liu3, Guozhen Du2, Zhigang Zhao2*   

  1. 1College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000

    2Laboratory of Arid and Grassland Ecology, Ministry of Education, Lanzhou University, Lanzhou 730000

    3School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730000
  • Received:2011-05-12 Revised:2011-10-16 Online:2012-05-09
  • Zhigang Zhao E-mail:zhaozhg@lzu.edu.cn

We measured floral traits of Trollius ranunculoides at different flowering time, observed the taxa of pollinators and pollinator visiting frequencies, and collected the seeds in the end of growing season to estimate pollinator preferences and the overall phenotypic selection gradient. We estimated phenotypic selection on floral traits at different flowering time using female fitness (seed number). We found significant differences of floral traits among different flowering time, with the corresponding preference, taxa, and visiting frequencies of pollinators also different. During early flowering time, visiting frequencies of bees were higher, flower calxy and petal size were wider, and total stalk length was shorter on flowers that bees preferred; however, there was no significant flower preference by different fly species. Furthermore, our estimates of phenotypic selection through female fitness differed at variable flowering time. The results of our study indicate that divergent flowering time and corresponding variation in pollinators might lead to different phenotypes, ultimately resulting in the divergence of floral traits. However, pollinator preference

CLC Number: 

  • Q94

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