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1996 Fiscal Year Final Research Report Summary

Selection by pollinators on the speciation of flowering plants

Research Project

Project/Area Number 06640897
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 系統・分類
Research InstitutionSHINSHU UNIVERSITY

Principal Investigator

INOUE Ken  Shinshu University, Biological Institute and Herbarium, Professor, 理学部, 教授 (40176425)

Project Period (FY) 1994 – 1996
KeywordsCampanula / Bumble bees / Flower size / male reproductive success / pollination efficiency / morphological adaptation
Research Abstract

A series of experiments to investigate the selective forces by pollinating insects on the flower size of Campanula (Campanulaceae) were carried out. I collected plants of Campanula from Honshu and the Izu Islands, and created an experimental population of Campanula with a large variation in flower size. First experiment was to present flowers with large variation to pollinators and to investigate their responces. The responces of pollinators (bumblebees, megachilid bees, halictid bees) was different from each other.
Next experiment was to present flowers of male-phased flower with size variation and large female-phased flower to bumblebees and to investigate the male reproductive success in relation to male flower size. It was found that larger flowered-plants more sired than smaller flowered-ones.
Third experiment was to investigate the amount and position of pollen grains to bumblebee body, using dried bumblebee specimens and fresh Campanula flowers. It was found that flower size determined the position of pollaen attached to bumblebees in which larger flowers were more appropriate to pollen deposition than smaller ones.
It was suggested that flower size of Campanula is stabilized by the selection through morphological adaptation to bumblebee pollinators.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Inoue, K., M. Maki & M. Masuda: "Different responses of pollinating bees to size variation and sexual phases in flower of Canpensle" Ecological Research. 10. 267-273 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Inoue, K., M. Maki & M. Masuda: "D. Lloyd & S. Barnett(eds.) Floral Biology Chapter 14" Chapman & Hall, 23 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Inoue, K,.M.Maki & M.Masuda: "Different responses of pollinating bees to size variation and sexual phases in flowers of Campanula." Ecological Research. 10. 267-273 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Inoue, K., M.Maki & M.Masuda: Evolution of Campanula flowers in relation to insect pollinators on islands. (D.Lloyd & S.Barrett, eds.) Floral Biology. Chapman & Hall, 377-400

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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