A new dimension to hummingbird - Flower relationships

  • Temeles E
  • 45


    Mendeley users who have this article in their library.
  • 43


    Citations of this article.


The close correspondence between the bills of hummingbirds and the lengths of the flowers they feed from has been interpreted as an example of coadaptation. Observations of birds feeding at flowers longer and shorter than their bills, however, and the lack of experimental mental evidence for any feeding advantage to short bills, seem to contradict this interpretation. I address this problem by considering a little-studied dimension of floral morphology: corolla diameter. In laboratory experiments on female ruby-throated hummingbirds (Archilochus colubris), probing abilities (maximum extraction depths) increased with increasing corolla diameter. Handling times increased with decreasing corolla diameter, resulting in ''handling time equivalents'', i.e., flowers having the same handling times but different lengths and diameters. Longer-billed birds had greater maximum extraction depths and shorter handling times than shorter-billed birds at all corolla diameters greater than the width of the bill. In contrast, shorter-billed birds made fewer errors inserting their bills into narrow flowers. Hence, differences in bill lengths apparently are associated with trade-offs in foraging abilities, whereby longer-billed birds are able to feed at long flowers and may do so more quickly, whereas shorter-billed birds are able to feed more successfully at narrow flowers.

Author-supplied keywords

  • bill
  • feeding adaptation
  • foraging behavior
  • hummingbirds
  • morphology
  • plant-pollinator interactions
  • pollination
  • selection
  • tongue
  • trochilidae

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text


  • E J Temeles

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free