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Pollination and Flower Structure02:40

Pollination and Flower Structure

Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.

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Related Experiment Video

Updated: Jun 1, 2026

Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea
07:19

Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea

Published on: November 25, 2016

Linking pollinator visitation rate and pollen receipt.

E Cayenne Engel1, Rebecca E Irwin

  • 1Rocky Mountain Biological Laboratory, Crested Butte, Colorado 81224 USA;

American Journal of Botany
|June 10, 2011
PubMed
Summary

Quantifying pollinator visits is challenging. This study found that pollen receipt is a reliable indirect measure of pollinator visitation rates in flowering plants, even with varying floral traits.

Area of Science:

  • Ecology
  • Botany
  • Pollination Biology

Background:

  • Pollination is a vital ecosystem service provided by animals for most flowering plants.
  • Accurate quantification of pollinator visitation rates is often difficult, especially when visits are infrequent.
  • Pollen receipt by flowers is a potential indirect measure of pollinator activity.

Purpose of the Study:

  • To assess the utility of pollen receipt as an indirect measure of pollinator visitation rates.
  • To investigate the relationship between pollinator visitation rate, pollinator efficiency, and pollen receipt.
  • To examine the influence of floral and plant morphology on these relationships.

Main Methods:

  • The study used the hummingbird-pollinated plant, *Ipomopsis aggregata*.

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  • Floral traits (corolla length/width) and plant height were measured.
  • Path analysis was employed to differentiate the effects of visitation rate and efficiency on pollen receipt.

    • Main Results:

    • Pollinator visitation rate was the strongest direct positive predictor of pollen receipt, explaining 36% of its variation.
    • Plant height positively influenced visitation rate and indirectly affected pollen receipt.
    • Corolla length and width had only a weak direct effect on pollen receipt.

    Conclusions:

    • Pollen receipt is a direct and reliable indicator of pollinator visitation rate in *Ipomopsis aggregata*.
    • This indirect measure is valuable for ecological studies, particularly when direct observation of pollinators is challenging.
    • Understanding this relationship is crucial for assessing pollination services in diverse ecosystems.