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Related Concept Videos

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Related Experiment Video

Updated: Aug 29, 2025

Methods for Comparing Nutrients in Beebread Made by Africanized and European Honey Bees and the Effects on Hemolymph Protein Titers
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Variable evidence for convergence in morphology and function across avian nectarivores.

Amanda E Hewes1,2, David Cuban1,2, Derrick J E Groom3

  • 1Department of Biology, University of Washington, Seattle, Washington, USA.

Journal of Morphology
|September 5, 2022
PubMed
Summary

Avian nectarivory has evolved multiple times, driving convergent adaptations in bird anatomy for feeding, locomotion, and digestion. This review synthesizes these adaptations, identifying knowledge gaps for future research.

Keywords:
anatomydigestionfeedinglocomotionnectivore

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Area of Science:

  • Evolutionary Biology
  • Comparative Anatomy
  • Ornithology

Background:

  • Nectar-feeding birds offer insights into evolutionary form-function relationships.
  • Nectarivory has evolved independently multiple times in birds, presenting unique biophysical challenges.

Purpose of the Study:

  • To synthesize information on morphological and functional adaptations to nectarivory across avian taxa.
  • To identify convergent evolutionary patterns in the anatomy of nectar-feeding birds.
  • To estimate the number of independent avian nectarivory origins.

Main Methods:

  • Systematic tabulation of putative adaptations to nectarivory across bird body systems and taxa.
  • Phylogenetically informed estimation of nectarivory's evolutionary history in birds.
  • Review of feeding, locomotor, digestive, and renal systems in avian nectarivores.

Main Results:

  • A comprehensive summary of adaptations to nectarivory across avian body systems and taxa was created.
  • The first phylogenetically informed estimate of nectarivory's evolutionary occurrences in birds was provided.
  • The extent of morphological and functional convergence in avian nectarivores was identified.

Conclusions:

  • Significant knowledge gaps exist regarding the distribution and drivers of avian nectarivory adaptations.
  • Future research should focus on collecting new data to address ecological, evolutionary, and functional morphology questions.
  • This synthesis serves as a landmark for the current understanding of avian nectarivory's evolution and adaptation.